In an aspect herein, the disclosure provides a method for implementing a wideband electronically tunable filter, comprising: receiving an RF input at a first frequency within a first RF band; up-converting the RF input based on mixing the RF input with a transposition signal from a second RF band non-overlapping with the first RF band; generating an RF filter output based on applying an RF filter characteristic to the up-converted RF input; down-converting the RF filter output based on mixing the RF filter output with the transposition signal, and outputting an RF output based on the down-converted RF filter output.
H03H 11/04 - Frequency selective two-port networks
H04B 1/00 - Details of transmission systems, not covered by a single one of groups Details of transmission systems not characterised by the medium used for transmission
A filter, apparatus, system and method are provided for implementing a band select filter, for example a frequency agile band select filter. In an implementation, the filter includes two separate signal generators configured to provide different local oscillator signals to an input mixer and to an output mixer, resulting in the filter output frequency being different from the filter input frequency. This is in contrast to known approaches which use the same signal generator to drive both input and output mixers. The filter may include two bandpass filters, three mixers, and three signal generators, each signal generator uniquely associated with one of the mixers, and configured to provide bandwidth control. A system of filters may include a set of bandpass filters, a plurality of sets of mixers, and a plurality of sets of signal generators, each set of signal generators being associated with a different set of mixers.
H04B 1/00 - Details of transmission systems, not covered by a single one of groups Details of transmission systems not characterised by the medium used for transmission
In an aspect herein, the disclosure provides a method for implementing a wideband electronically tunable filter, comprising: receiving an RF input at a first frequency within a first RF band; up-converting the RF input based on mixing the RF input with a transposition signal from a second RF band non-overlapping with the first RF band; generating an RF filter output based on applying an RF filter characteristic to the up-converted RF input; down-converting the RF filter output based on mixing the RF filter output with the transposition signal, and outputting an RF output based on the down-converted RF filter output.
A transposed delay line oscillator including a mode selection filter and a transposed delay line is provided. An output of the transposed delay line is coupled to an input of the mode selection filter to establish an oscillator loop. Based on the transposed delay line output, the mode selection filter generates a mode selection signal including an isolated oscillatory mode, in a Radio Frequency (RF) band. The transposed delay line receives the mode selection signal for transposition to an intermediate frequency of an intermediate frequency (IF) delay line. The IF delay line includes a delay filter and a phase noise suppression loop configured to suppress de-correlated transposition phase noise resulting from a delay of the delay filter. Suppression of phase noise in the IF delay line enables cancellation of transposition phase noise when transposing the IF delay line output to the RF band.
H03K 5/1252 - Suppression or limitation of noise or interference
H03D 7/00 - Transference of modulation from one carrier to another, e.g. frequency-changing
H03K 5/14 - Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals by the use of delay lines
Disclosed herein is a system and method for determining a thickness of ice on Radio Frequency (RF) systems The system includes a sensor unit for use in determining the thickness of ice on a surface of a RADAR system having a RADAR antenna, the sensor unit including a sensor unit antenna tunable to a harmonic of a RADAR antenna signal, the harmonic having a frequency within an ice absorption band, wherein the sensor unit antenna emits the harmonic at a first signal strength; and, a sensor unit receiver communicatively coupled to the sensor unit antenna and configured to detect a second signal strength of the harmonic received by the sensor unit antenna.
G01B 15/02 - Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
H01Q 13/20 - Non-resonant leaky-waveguide or transmission-line antennas Equivalent structures causing radiation along the transmission path of a guided wave
An oscillator and method for maintaining a phase lock is provided. The oscillator may include an oscillator input port for receiving a reference signal, an oscillator output port for outputting an oscillator output, an unlocked oscillator oscillating in an unlocked state and outputting at a resonance frequency configured to drift in response to changes in an operating environment, and a phase locked loop (PLL) including a mixer having an output port configured to output the unlocked oscillator output mixed with a local oscillator output, the mixer output port in communication with a phase frequency detector and the oscillator output port, and the phase frequency detector generating a control signal based on a detected phase difference between the reference signal and the mixer output wherein the control signal adjusts the local oscillator output to compensate for the resonance frequency drift of the unlocked oscillator when mixed with the unlocked oscillator output.
H03B 5/04 - Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
H03B 5/18 - Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
An optoelectronic oscillator (OEO) including a drift compensation circuit is provided. The OEO includes a set of optical domain components communicatively coupled with a set of RF domain components. The RF domain components include a mode selection filter, a phase locked loop (PLL) and a drift compensation circuit communicatively coupled between the mode selection filter and the PLL. The mode selection filter provides a mode selection result to the drift compensation circuit. The drift compensation circuit phase modulates the mode selection result in a vector based coordinate system to maintain a drift compensated mode selection result within a locking bandwidth of the PLL, and to minimize phase shifting from accumulating phase drift. The PLL detects a phase difference between the drift compensated mode selection result and a reference signal, for use in maintaining the PLL in a phase lock with the reference signal, in particular over wide operational temperature ranges.
H03B 17/00 - Generation of oscillations using a radiation source and a detector
H03L 7/081 - Details of the phase-locked loop provided with an additional controlled phase shifter
H03L 7/087 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using at least two phase detectors or a frequency and phase detector in the loop
A delay device includes a tuning network including first and second tuning components having frequency responses that overlap in an intermediate frequency band to provide a group delay response. A delay modifier is in communication with the tuning network and configured to provide an offset frequency as an input to the tuning network, and to electronically adjust a group delay value associated with the group delay response by varying the offset frequency. The difference between a frequency of an input reference signal and a local oscillator frequency produced by the delay modifier is substantially equal to an intermediate frequency of the tuning network. The tuning network and the delay modifier cooperate to transpose the reference signal at the reference frequency down to the IF band before passing through the first and second delay lines, and back up to the RF band after passing through the first and second delay lines.
G01S 7/41 - Details of systems according to groups , , of systems according to group using analysis of echo signal for target characterisationTarget signatureTarget cross-section
A RADAR antenna system and method are provided. In an implementation, the system includes a base and first and second antennas configured to transmit independent first and second antenna beams, respectively. The first and second antennas are each coupled to the base so as to provide a common rotational axis for the first and second antennas. An antenna position controller is configured to independently control first and second transmission positions associated with the first and second antennas, respectively. Two different antenna technologies can be used, for example one for providing communications capability and the other for providing tracking capability. Other implementations include four or more antennas configured to transmit beams at similar or different frequencies. Improvements in scan rate proportional to the number of antennas are achieved compared to that achievable with a single beam, without an increase in the rotation rate of the antenna system.
H01Q 21/28 - Combinations of substantially independent non-interacting antenna units or systems
G01S 7/00 - Details of systems according to groups , ,
G01S 7/03 - Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
G01S 13/10 - Systems for measuring distance only using transmission of interrupted, pulse modulated waves
G01S 13/72 - Radar-tracking systemsAnalogous systems for two-dimensional tracking, e.g. combination of angle and range tracking, track-while-scan radar
H01Q 3/08 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
H01Q 21/06 - Arrays of individually energised antenna units similarly polarised and spaced apart
A solid state RADAR antenna system is provided comprising at least one antenna configured to transmit a plurality of antenna beams. Each antenna beam is decoupled from each of the other plurality of antenna beams for transmitting in a blind range of a different antenna beam. Accordingly, in an implementation, the second antenna beam is transmitted so as to scan a first blind range associated with the first antenna beam. Decoupling antenna beams can be achieved using one or more of physical decoupling using different antennas, frequency decoupling using different bands and/or frequency multiplexing, or orthogonal polarization.
A transposed delay line oscillator including a mode selection filter and a transposed delay line is provided. An output of the transposed delay line is coupled to an input of the mode selection filter to establish an oscillator loop. Based on the transposed delay line output, the mode selection filter generates a mode selection signal including an isolated oscillatory mode, in a Radio Frequency (RF) band. The transposed delay line receives the mode selection signal for transposition to an intermediate frequency of an intermediate frequency (IF) delay line. The IF delay line includes a delay filter and a phase noise suppression loop configured to suppress de-correlated transposition phase noise resulting from a delay of the delay filter. Suppression of phase noise in the IF delay line enables cancellation of transposition phase noise when transposing the IF delay line output to the RF band.
A delay device includes a tuning network including first and second tuning components having frequency responses that overlap in an intermediate frequency band to provide a group delay response. A delay modifier is in communication with the tuning network and configured to provide an offset frequency as an input to the tuning network, and to electronically adjust a group delay value associated with the group delay response by varying the offset frequency. The difference between a frequency of an input reference signal and a local oscillator frequency produced by the delay modifier is substantially equal to an intermediate frequency of the tuning network. The tuning network and the delay modifier cooperate to transpose the reference signal at the reference frequency down to the IF band before passing through the first and second delay lines, and back up to the RF band after passing through the first and second delay lines.
An optoelectronic oscillator (OEO) including a drift compensation circuit is provided. The OEO includes a set of optical domain components communicatively coupled with a set of RF domain components. The RF domain components include a mode selection filter, a phase locked loop (PLL) and a drift compensation circuit communicatively coupled between the mode selection filter and the PLL. The mode selection filter provides a mode selection result to the drift compensation circuit. The drift compensation circuit phase modulates the mode selection result in a vector based coordinate system to maintain a drift compensated mode selection result within a locking bandwidth of the PLL, and to minimize phase shifting from accumulating phase drift. The PLL detects a phase difference between the drift compensated mode selection result and a reference signal, for use in maintaining the PLL in a phase lock with the reference signal, in particular over wide operational temperature ranges.
H03B 17/00 - Generation of oscillations using a radiation source and a detector
H03B 1/04 - Reducing undesired oscillations, e.g. harmonics
H03L 7/085 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
G01S 7/03 - Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
Disclosed herein is a system and method for determining a thickness of ice on Radio Frequency (RF) systems The system includes a sensor unit for use in determining the thickness of ice on a surface of a RADAR system having a RADAR antenna, the sensor unit including a sensor unit antenna tunable to a harmonic of a RADAR antenna signal, the harmonic having a frequency within an ice absorption band, wherein the sensor unit antenna emits the harmonic at a first signal strength; and, a sensor unit receiver communicatively coupled to the sensor unit antenna and configured to detect a second signal strength of the harmonic received by the sensor unit antenna.
G01B 15/02 - Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
A solid state RADAR antenna system is provided comprising at least one antenna configured to transmit a plurality of antenna beams. Each antenna beam is decoupled from each of the other plurality of antenna beams for transmitting in a blind range of a different antenna beam. Accordingly, in an implementation, the second antenna beam is transmitted so as to scan a first blind range associated with the first antenna beam. Decoupling antenna beams can be achieved using one or more of physical decoupling using different antennas, frequency decoupling using different bands and/or frequency multiplexing, or orthogonal polarization.
A RADAR antenna system and method are provided. In an implementation, the system includes a base and first and second antennas configured to transmit independent first and second antenna beams, respectively. The first and second antennas are each coupled to the base so as to provide a common rotational axis for the first and second antennas. An antenna position controller is configured to independently control first and second transmission positions associated with the first and second antennas, respectively. Two different antenna technologies can be used, for example one for providing communications capability and the other for providing tracking capability. Other implementations include four or more antennas configured to transmit beams at similar or different frequencies. Improvements in scan rate proportional to the number of antennas are achieved compared to that achievable with a single beam, without an increase in the rotation rate of the antenna system.
An optoelectronic oscillator (OEO) is disclosed comprising an electronically tunable filter for transposing narrow pass band characteristics of a surface acoustic wave (SAW) filter to a microwave frequency to provide mode selection in the OEO. An OEO is disclosed comprising a set of optical domain components, a downconverter in communication with an output of the optical domain components, and a set of radio frequency (RF) domain components in communication with an output of the downconverter. The set of RF domain components comprises a tunable filter operating at a filter center frequency and having an output coupled to the set of optical domain components for communicating a mode selection result. The tunable filter including a tuner; and a sub-filter. The sub-filter operating at a fixed center frequency to provide mode selection and adjacent mode suppression with respect to the tunable filter center frequency. The sub-filter center frequency being lower than the tunable filter center frequency, and a ratio of the tunable filter center frequency to a bandwidth of the sub-filter being at least 1000:1.
H03B 5/00 - Generation of oscillations using amplifier with regenerative feedback from output to input
H03B 17/00 - Generation of oscillations using a radiation source and a detector
G02F 2/02 - Frequency-changing of light, e.g. by quantum counters
G02F 1/225 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference in an optical waveguide structure
H03J 3/28 - Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
G01S 13/524 - Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
G02F 1/21 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour by interference
An optoelectronic oscillator (OEO) is disclosed comprising an electronically tunable filter for transposing narrow pass band characteristics of a surface acoustic wave (SAW) filter to a microwave frequency to provide mode selection in the OEO. An OEO is disclosed comprising a set of optical domain components, a downconverter in communication with an output of the optical domain components, and a set of radio frequency (RF) domain components in communication with an output of the downconverter. The set of RF domain components comprises a tunable filter operating at a filter center frequency and having an output coupled to the set of optical domain components for communicating a mode selection result. The tunable filter including a tuner; and a sub-filter. The sub-filter operating at a fixed center frequency to provide mode selection and adjacent mode suppression with respect to the tunable filter center frequency. The sub-filter center frequency being lower than the tunable filter center frequency, and a ratio of the tunable filter center frequency to a bandwidth of the sub-filter being at least 1000:1.
H03B 17/00 - Generation of oscillations using a radiation source and a detector
G02F 2/02 - Frequency-changing of light, e.g. by quantum counters
H03K 3/42 - Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
H03K 5/14 - Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals by the use of delay lines
A digitally compensated phase locked oscillator (DCPLO) is disclosed herein. The DCPLO comprises: a DCPLO input for receiving a reference signal at a known frequency; a DCPLO output for outputting a signal at a desired frequency; a phased locked loop (PLL), the phased locked loop comprising: a phase frequency detector, an oscillator, and a PLL output coupled to the output; a first direct digital synthesizer (DDS), the first DDS having an output coupled to the PLL to supply a DDS signal to the PLL for adjusting the frequency within the PLL so as to maintain phase lock over the operating temperature; a temperature sensor; and a processor coupled to the first DDS, the phase frequency detector, and the temperature sensor, the processor configured to set the frequency of the first DDS according to a temperature sensed by the temperature sensor.
H03L 7/085 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
H03L 7/099 - Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
H03L 1/02 - Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
H03L 7/16 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
Embodiments disclosed herein relate to wave guide couplers as well as 3-way, 6-way, and 9-way combiners. The waveguide coupler comprises: a housing having a first outer waveguide branch, a second outer waveguide branch, and an inner waveguide branch; first, second, and third input ports in communication with the first outer, second outer, and the inner waveguide branches respectively; an output port in communication with the inner waveguide branch; a first wall separating the first outer waveguide branch and the inner waveguide branch, the first wall having a first iris; a second wall separating the second outer waveguide branch and the inner waveguide branch, the second wall having a second iris; a first tapered section in the first outer waveguide branch; and a second tapered section the second outer waveguide branch. Various embodiments of the 3-way, 6-way, and 9-way combiners are implemented using the wave guide coupler.
09 - Scientific and electric apparatus and instruments
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
(1) Radio frequency communication devices and components, namely, transmitters, receivers, transceivers, power supplies, and component parts; RADAR devices and components, namely, transmitters, receivers, transceivers, and component parts; microwave circuits; power amplifiers, low noise amplifiers, broadband amplifiers, radio frequency multipliers, radio frequency up converters and down converters, radio frequency mixers, radio frequency filters, radio frequency power limiters, radio frequency signal switches; electromagnetic sensors, thin film circuits; clock sources and electronic oscillators for radio frequency communication devices; LIDAR devices, namely, transmitters, receivers, transceivers, and component parts (1) Electronic sub-component manufacturing services
09 - Scientific and electric apparatus and instruments
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
(1) Radio frequency communication devices and components, namely, transmitters, receivers, transceivers, power supplies, and component parts; RADAR devices and components, namely, transmitters, receivers, transceivers, power supplies, and component parts; microwave circuits; power amplifiers, low noise amplifiers, broadband amplifiers, radio frequency multipliers, radio frequency up converters and down converters, radio frequency mixers, radio frequency filters, radio frequency power limiters, radio frequency signal switches; electromagnetic sensors
(2) Thin film circuits
(3) Clock sources and electronic oscillators for radio frequency communication devices
(4) LIDAR devices, namely, transmitters, receivers, transceivers, and component parts (1) Electronic sub-component manufacturing services
An electronically tunable filter (ETF) and systems comprising an ETF are disclosed herein. The ETF comprises: a first image rejection mixer; a second image rejection mixer; a first hybrid coupler, the first hybrid coupler being coupled to the first image rejection mixer; a second hybrid coupler, the second hybrid coupler being coupled to the second image rejection mixer; an internal filter coupled to the first hybrid coupler and the second hybrid coupler; a control port for receiving a control signal; a power splitter coupled to the control port, the first image rejection mixer, and the second image rejection mixer; a first port coupled to the first image rejection mixer; and a second port coupled to the first image rejection mixer.
An offset phase locked loop synthesizer comprising: an input; an output; a voltage controlled oscillator (VCO), the VCO output coupled to the synthesizer output; a phase frequency detector having a reference input, a feed-back input, and an output; a mixer having a first mixer input coupled to the synthesizer input and a second mixer input coupled to the VCO output; a first divider for frequency dividing a signal by a first value and having an input coupled to the mixer output and an output coupled to the second input of the phase frequency detector; a second divider for frequency dividing a signal by a second value and having an input coupled to the synthesizer input and an output coupled to the reference input of the phase frequency detector; and a low pass filter coupled between the output of the phase frequency detector and the VCO input.
H03L 7/085 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
H03L 7/099 - Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
H03L 7/18 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
H03L 7/185 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using a mixer in the loop
H03L 7/23 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
A digitally compensated phase locked oscillator (DCPLO) is disclosed herein. The DCPLO comprises: a DCPLO input for receiving a reference signal at a known frequency; a DCPLO output for outputting a signal at a desired frequency; a phased locked loop (PLL), the phased locked loop comprising: a phase frequency detector, an oscillator, and a PLL output coupled to the output; a first direct digital synthesizer (DDS), the first DDS having an output coupled to the PLL to supply a DDS signal to the PLL for adjusting the frequency within the PLL so as to maintain phase lock over the operating temperature; a temperature sensor; and a processor coupled to the first DDS, the phase frequency detector, and the temperature sensor, the processor configured to set the frequency of the first DDS according to a temperature sensed by the temperature sensor.
H03L 1/02 - Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
H03L 7/085 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
Embodiments disclosed herein relate to wave guide couplers as well as 3-way, 6-way, and 9-way combiners. The waveguide coupler comprises: a housing having a first outer waveguide branch, a second outer waveguide branch, and an inner waveguide branch; first, second, and third input ports in communication with the first outer, second outer, and the inner waveguide branches respectively; an output port in communication with the inner waveguide branch; a first wall separating the first outer waveguide branch and the inner waveguide branch, the first wall having a first iris; a second wall separating the second outer waveguide branch and the inner waveguide branch, the second wall having a second iris; a first tapered section in the first outer waveguide branch; and a second tapered section the second outer waveguide branch. Various embodiments of the 3-way, 6-way, and 9-way combiners are implemented using the wave guide coupler.
An electronically tunable filter (ETF) and systems comprising an ETF are disclosed herein The ETF comprises: a first image rejection mixer; a second image rejection mixer; a first hybrid coupler, the first hybrid coupler being coupled to the first image rejection mixer; a second hybrid coupler, the second hybrid coupler being coupled to the second image rejection mixer; an internal filter coupled to the first hybrid coupler and the second hybrid coupler; a control port for receiving a control signal; a power splitter coupled to the control port, the first image rejection mixer, and the second image rejection mixer; a first port coupled to the first image rejection mixer; and a second port coupled to the first image rejection mixer.
G01S 7/03 - Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
H03K 5/13 - Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
H04B 1/00 - Details of transmission systems, not covered by a single one of groups Details of transmission systems not characterised by the medium used for transmission
An offset phase locked loop synthesizer comprising: an input; an output; a voltage controlled oscillator (VCO), the VCO output coupled to the synthesizer output; a phase frequency detector having a reference input, a feed- back input, and an output; a mixer having a first mixer input coupled to the synthesizer input and a second mixer input coupled to the VCO output; a first divider for frequency dividing a signal by a first value and having an input coupled to the mixer output and an output coupled to the second input of the phase frequency detector; a second divider for frequency dividing a signal by a second value and having an input coupled to the synthesizer input and an output coupled to the reference input of the phase frequency detector; and a low pass filter coupled between the output of the phase frequency detector and the VCO input.
H03L 7/099 - Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
H03L 7/085 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
H03L 7/18 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
Circuits and methods for identifying or verifying frequencies are disclosed herein. A frequency verification circuit comprises: an input port for receiving an input signal; a phase frequency difference detector for determining a difference in phase and frequency between the input signal and a feedback signal and for providing a control signal based on the detected difference; a voltage controlled crystal oscillator for producing an output signal based on the control signal; and a feedback loop including a feedback divider for frequency dividing the output signal by a factor R to produce the feedback signal, the feedback divider being programmable to a plurality of values of the factor R to correspond to a plurality of different test frequencies.
G01R 23/02 - Arrangements for measuring frequency, e.g. pulse repetition rateArrangements for measuring period of current or voltage
H03L 7/095 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using a lock detector
H03L 7/06 - Automatic control of frequency or phaseSynchronisation using a reference signal applied to a frequency- or phase-locked loop
H03L 7/183 - Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
Circuits and methods for identifying or verifying frequencies are disclosed herein. A frequency verification circuit comprises: an input port for receiving an input signal; a phase frequency difference detector for determining a difference in phase and frequency between the input signal and a feedback signal and for providing a control signal based on the detected difference; a voltage controlled crystal oscillator for producing an output signal based on the control signal; and a feedback loop including a feedback divider for frequency dividing the output signal by a factor R to produce the feedback signal, the feedback divider being programmable to a plurality of values of the factor R to correspond to a plurality of different test frequencies.
G01R 23/12 - Arrangements for measuring frequency, e.g. pulse repetition rateArrangements for measuring period of current or voltage by converting frequency into phase shift
An apparatus and method for providing an output signal. The apparatus comprises an input for receiving a reference signal, an oscillator for providing an output signal, and an offset signal generator for frequency multiplying the reference signal to generate an offset signal that has a plurality of frequency products in a plurality of frequency bands. The apparatus further includes a mixer for mixing the offset signal with the output signal to produce a combined signal, an offset frequency selector for controllably selecting a frequency band of the offset signal, and a difference detector for detecting a difference between the reference signal and the combined signal and for providing a control signal to the oscillator based on the detected difference.
An apparatus and method for providing an output signal. The apparatus comprises an input for receiving a reference signal, an oscillator for providing an output signal, and an offset signal generator for frequency multiplying the reference signal to generate an offset signal that has a plurality of frequency products in a plurality of frequency bands. The apparatus further includes a mixer for mixing the offset signal with the output signal to produce a combined signal, an offset frequency selector for controllably selecting a frequency band of the offset signal, and a difference detector for detecting a difference between the reference signal and the combined signal and for providing a control signal to the oscillator based on the detected difference.
Circuits and methods for identifying or verifying frequencies are disclosed herein. A frequency verification circuit comprises: an input port for receiving an input signal; a phase frequency difference detector for determining a difference in phase and frequency between the input signal and a feedback signal and for providing a control signal based on the detected difference; a voltage controlled crystal oscillator for producing an output signal based on the control signal; and a feedback loop including a feedback divider for frequency dividing the output signal by a factor R to produce the feedback signal, the feedback divider being programmable to a plurality of values of the factor R to correspond to a plurality of different test frequencies.
