A method for amplifying an RF signal is provided. The method includes providing the RF signal to an input of a quadrature coupler. The method includes outputting, from the quadrature coupler, a carrier path signal and a peak path signal. The method includes amplifying the carrier path signal to provide an amplified carrier path signal and amplifying the peak path signal to provide an amplified peak path signal. The method includes generating a first neutralizing signal based on the carrier path signal and generating a second neutralizing signal based on the peak path signal. The method includes modifying the amplified peak path signal based on the first neutralizing signal to provide a neutralized peak path signal and modifying the amplified carrier path signal based on the second neutralizing signal to provide a neutralized carrier path signal. The method also includes combining the neutralized carrier path and peak path signals.
A method for amplifying an RF signal is provided. The method includes providing the RF signal to an input of a quadrature coupler. The method includes outputting, from the quadrature coupler, a carrier path signal and a peak path signal. The method includes amplifying the carrier path signal to provide an amplified carrier path signal and amplifying the peak path signal to provide an amplified peak path signal. The method includes generating a first neutralizing signal based on the carrier path signal and generating a second neutralizing signal based on the peak path signal. The method includes modifying the amplified peak path signal based on the first neutralizing signal to provide a neutralized peak path signal and modifying the amplified carrier path signal based on the second neutralizing signal to provide a neutralized carrier path signal. The method also includes combining the neutralized carrier path and peak path signals.
A circuit includes: an RF amplifier including RF transistor(s); a DC power source electrically coupled to the RF amplifier; a bias control input that receives a bias control signal from a bias control circuit electrically coupled to the DC power source; and a thermal tracking circuit located at a distance from the RF transistor(s) such that RF interference between the RF transistor(s) and the thermal tracking circuit is below a threshold during circuit operation. The thermal tracking circuit includes heating element(s), a DC bias reference device, and a thermal tracking control circuit electrically coupled to the DC power source and the heating element(s). The thermal tracking control circuit generates a signal that controls a thermal behavior of the heating element(s). The heating element(s) heat the DC bias reference device when activated. The DC bias reference device is electrically coupled to the bias control input to modulate a bias voltage.
A circuit includes: an RF amplifier including RF transistor(s); a DC power source electrically coupled to the RF amplifier; a bias control input that receives a bias control signal from a bias control circuit electrically coupled to the DC power source; and a thermal tracking circuit located at a distance from the RF transistor(s) such that RF interference between the RF transistor(s) and the thermal tracking circuit is below a threshold during circuit operation. The thermal tracking circuit includes heating element(s), a DC bias reference device, and a thermal tracking control circuit electrically coupled to the DC power source and the heating element(s). The thermal tracking control circuit generates a signal that controls a thermal behavior of the heating element(s). The heating element(s) heat the DC bias reference device when activated. The DC bias reference device is electrically coupled to the bias control input to modulate a bias voltage.
Radio-frequency amplifier circuit including: a first matching circuit; a driver stage circuit, in which the first matching circuit is coupled to the driver stage circuit, and in which the first matching circuit is configured to transform an input impedance of the driver stage circuit into a first impedance at an input to the first matching circuit; an inter-stage matching circuit coupled to the driver stage circuit; an output stage circuit coupled to the inter-stage matching circuit, in which the inter-stage matching circuit is configured to transform an input impedance of the output stage circuit into a second impedance at an output of the driver stage circuit; and and a second matching circuit coupled to the output stage circuit, in which the second matching circuit is configured to transform an impedance at an output of the second matching circuit into a third impedance at the output of the output stage circuit.
H03F 1/10 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of amplifying elements with multiple electrode connections
H03F 3/50 - Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
Radio-frequency amplifier circuit including: a first matching circuit; a driver stage circuit, in which the first matching circuit is coupled to the driver stage circuit, and in which the first matching circuit is configured to transform an input impedance of the driver stage circuit into a first impedance at an input to the first matching circuit; an inter-stage matching circuit coupled to the driver stage circuit; an output stage circuit coupled to the inter-stage matching circuit, in which the inter-stage matching circuit is configured to transform an input impedance of the output stage circuit into a second impedance at an output of the driver stage circuit; and and a second matching circuit coupled to the output stage circuit, in which the second matching circuit is configured to transform an impedance at an output of the second matching circuit into a third impedance at the output of the output stage circuit.
A radio-frequency (RF) push-pull amplifier circuit that includes: a first transistor; a transformer; and a first matching circuit comprising at least one capacitor and at least one inductor, in which an input of the first matching circuit is coupled to an output of the first transistor, an output of the first matching circuit is coupled to an input of the transformer, and the first matching circuit is configured to transform an impedance at the input of the transformer into a first predefined impedance at the output of the first transistor.
H03F 1/10 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of amplifying elements with multiple electrode connections
H03F 3/50 - Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
A radio-frequency (RF) push-pull amplifier circuit that includes: a first transistor; a transformer; and a first matching circuit comprising at least one capacitor and at least one inductor, in which an input of the first matching circuit is coupled to an output of the first transistor, an output of the first matching circuit is coupled to an input of the transformer, and the first matching circuit is configured to transform an impedance at the input of the transformer into a first predefined impedance at the output of the first transistor.
H03F 3/50 - Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
09 - Scientific and electric apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Integrated circuits; integrated circuits and protocol stack
software used for wireless communication systems and in
wireless communication devices for enabling, establishing
and operating wireless communication systems; integrated
circuits and application software for mobile phones;
integrated circuits and application software for personal
digital assistants and computers comprised of utility
programs, word processing programs, computer security
programs, calendar programs, address book programs, game
programs, task management programs and electronic mail
programs; integrated circuits and application software for
personal digital assistants and computers for providing
entertainment information and news, traffic information,
news and other information to the user; integrated circuit
modules and hardware modules; computer software and protocol
stack software used for enabling, establishing and operating
wireless communication systems; communications devices in
the nature of cellular phones, and other wireless protocols;
wireless communication chip sets for use in transmitting
data using GSM, (E)GPRS, TD-SCDMA, WCDMA, and other wireless
protocols. Design, testing, development, and consulting for others in
the field of wireless communication system-on-ship (SOC),
communication devices, wireless chipsets, integrated
circuits, integrated circuit modules and hardware modules,
computer hardware and computer software; technical support
services, namely, troubleshooting in the nature of
diagnosing computer hardware and software problems.
09 - Scientific and electric apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Integrated circuits; integrated circuits and protocol stack downloadable software used for wireless communication systems and in wireless communication devices for enabling, establishing and operating wireless communication systems; integrated circuit modules and computer hardware modules for use in electronic devices using the Internet of Things; downloadable computer software and protocol stack downloadable software used for enabling, establishing and operating wireless communication systems; communications devices in the nature of cellular phones, and other wireless protocols, namely, wireless devices, namely, telephones, and LAN (local area hardware), and ultra-wideband, namely, reconfigurable processors for use in wireless communication handsets and network equipment in the field of wideband communications; wireless semiconductor communication chipsets for use in multiway communications, namely, for transmitting data using global system for mobile communications (GSM), general packet radio service and enhanced general packet radio service ((E)GPRS), time division synchronous code division multiple access (TD-SCDMA), and wideband code division multiple access (WCDMA) Design, testing, development, and consulting for others in the field of wireless communication system-on-chip (SOC), wireless communication devices for voice, data or image transmission, wireless chipsets, integrated circuits, integrated circuit modules and hardware modules for use with the Internet of Things, computer hardware and computer software; technical support services, namely, troubleshooting of computer hardware and software problems
11.
Transceiver system supporting receiver self calibration and methods of performing the same
A self-calibrating transceiver includes a baseband processor, a receiver chain comprising an amplifier and a digital front end (DFE), and a transmitter chain, and a calibration control state machine. The state machine stores amplifier gain steps and is in communication with the transmitter chain, the receiver chain, and the baseband processor. The state machine can set a receiver chain frequency at a predefined frequency and set a transmitter chain frequency to be offset relative to the receiver chain frequency. For each of the amplifier gain steps, the state machine can set a gain of the receiver chain and set a power of the transmitter chain. The baseband processor can measure an RSSI and transmit the measured RSSI to the state machine. The state machine can determine a digital gain compensation value based on the one or more measured RSSIs and apply the determined digital gain compensation value.
H04B 17/14 - Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
H04B 17/21 - Monitoring; Testing of receivers for correcting measurements
H04B 1/38 - Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
A low-power crystal oscillator circuit operating in Class B includes a PMOS transistor, an NMOS transistor, a step-down voltage regulator, and a bias voltage generator. A feedback mechanism includes an inverter whose input is connected to the drains of the PMOS and NMOS transistors and whose output is capacitively coupled to the gate of the PMOS transistor to provide positive feedback.
H03B 5/36 - Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
H03L 7/00 - Automatic control of frequency or phase; Synchronisation
13.
TRANSCEIVER SYSTEM SUPPORTING TRANSMITTER SELF CALIBRATION AND METHODS OF PERFORMING THE SAME
A self-calibrating transceiver includes a transmitter chain, a receiver chain, a base band processor, and a calibration control state machine. The state machine is in electrical communication with the transmitter chain, the receiver chain, and the base band processor, and is configured for enabling the receiver chain and setting the receiver chain and the transmitter chain to corresponding frequencies. The state machine stores one or more transmitter power and power amplifier gain mode settings, and for each setting, sets the transmitter gain and power amplifier gain mode. The transmitter chain transmits a signal, the receiver chain receives the transmitted signal, and the baseband processor measures a received signal strength indicator (RSSI) of the received signal. The state machine further adjusts the transmitter output power based on the measured RSSI.
A self-calibrating transceiver includes a baseband processor, a receiver chain comprising an amplifier and a digital front end (DFE), and a transmitter chain, and a calibration control state machine. The state machine stores amplifier gain steps and is in communication with the transmitter chain, the receiver chain, and the baseband processor. The state machine can set a receiver chain frequency at a predefined frequency and set a transmitter chain frequency to be offset relative to the receiver chain frequency. For each of the amplifier gain steps, the state machine can set a gain of the receiver chain and set a power of the transmitter chain. The baseband processor can measure an RSSI and transmit the measured RSSI to the state machine. The state machine can determine a digital gain compensation value based on the one or more measured RSSIs and apply the determined digital gain compensation value.
H04B 17/14 - Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
H04B 17/21 - Monitoring; Testing of receivers for correcting measurements
H04B 1/38 - Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
A self-calibrating transceiver includes a transmitter chain, a receiver chain, a base band processor, and a calibration control state machine. The state machine is in electrical communication with the transmitter chain, the receiver chain, and the base band processor, and is configured for enabling the receiver chain and setting the receiver chain and the transmitter chain to corresponding frequencies. The state machine stores one or more transmitter power and power amplifier gain mode settings, and for each setting, sets the transmitter gain and power amplifier gain mode. The transmitter chain transmits a signal, the receiver chain receives the transmitted signal, and the baseband processor measures a received signal strength indicator (RSSI) of the received signal. The state machine further adjusts the transmitter output power based on the measured RSSI.
First and second inputs are received. The first input indicates a frequency offset of a frequency band allocated for signal transmission. The said allocated band is a subband of a total band available for transmission. The second input indicates a bandwidth of the allocated band. One or more filters of a transmitter of a communications system are controlled to operate cumulatively in a lowpass filtering mode, wherein the highest frequency in a pass band in the lowpass filtering mode is less than the highest frequency of the total band available for transmission. A signal is filtered using the filter(s).
A receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is an improvement compared to the traditional techniques in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
First and second inputs are received. The first input indicates a frequency offset of a frequency band allocated for signal transmission. The said allocated band is a subband of a total band available for transmission. The second input indicates a bandwidth of the allocated band. One or more filters of a transmitter of a communications system are controlled to operate cumulatively in a lowpass filtering mode, wherein the highest frequency in a pass band in the lowpass filtering mode is less than the highest frequency of the total band available for transmission. A signal is filtered using the filter(s).
A receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is an improvement compared to the traditional techniques in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Methods and apparatuses for compensating for frequency mismatch between a base station and mobile station are disclosed. At a first oscillator, a fixed reference oscillation signal is generated. At a second oscillator, a baseband oscillation signal is generated. A frequency divided version of the baseband oscillation signal is locked to a frequency divided version of the first reference oscillation signal. At a third oscillator, a first RF oscillation signal is generated. A frequency divided version of the first RF oscillation signal is locked to the frequency divided version of the second reference oscillation signal. A frequency adjustment signal is inputted to the second and third oscillators. At the second and third oscillators, frequency errors of the baseband oscillation signal and first RF oscillation signal, respectively, are compensated based on the frequency adjustment signal.
H04L 27/152 - Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
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 7/197 - 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 numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
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 7/183 - 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
23.
Method and apparatus for transmitter optimization based on allocated transmission band
First and second inputs are received. The first input indicates a frequency offset of a frequency band allocated for signal transmission. The said allocated band is a subband of a total band available for transmission. The second input indicates a bandwidth of the allocated band. One or more filters of a transmitter of a communications system are controlled to operate cumulatively in a lowpass filtering mode, wherein the highest frequency in a pass band in the lowpass filtering mode is less than the highest frequency of the total band available for transmission. A signal is filtered using the filter(s).
First and second inputs are received. The first input indicates a frequency offset of a frequency band allocated for signal transmission. The said allocated band is a subband of a total band available for transmission. The second input indicates a bandwidth of the allocated band. One or more filters of a transmitter of a communications system are controlled to operate cumulatively in a lowpass filtering mode, wherein the highest frequency in a pass band in the lowpass filtering mode is less than the highest frequency of the total band available for transmission. A signal is filtered using the filter(s).
In a signal processing method, an input signal is provided at an input to a receiver. A bandwidth of the receiver is controlled to a predetermined wideband setting. For band in a plurality of frequency bands, the input signal is processed at the receiver with a mixer, an amplifier, and a filter, to generate a first processed signal, and a power spectral density of the processed signal is generated over that frequency band, to provide a frequency domain signal for that frequency band. Based on the frequency domain signals corresponding to each frequency band in the plurality of frequency bands, a frequency domain representation of the processed signal is reconstructed over a reconstruction band having a bandwidth larger than the predetermined wideband setting. Based on the reconstructed frequency domain representation, a spectral component is identified corresponding to at least one cellular telephony access mode.
In a signal processing method, an input signal is provided at an input to a receiver. A bandwidth of the receiver is controlled to a predetermined wideband setting. For band in a plurality of frequency bands, the input signal is processed at the receiver with a mixer, an amplifier, and a filter, to generate a first processed signal, and a power spectral density of the processed signal is generated over that frequency band, to provide a frequency domain signal for that frequency band. Based on the frequency domain signals corresponding to each frequency band in the plurality of frequency bands, a frequency domain representation of the processed signal is reconstructed over a reconstruction band having a bandwidth larger than the predetermined wideband setting. Based on the reconstructed frequency domain representation, a spectral component is identified corresponding to at least one cellular telephony access mode.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, the presence of interference is detected, and the relative frequency location of the interference is detected. The relative frequency location specifies whether the frequency of the interference is high side (above the desired signal, i.e., at a higher frequency) or low side (below the desired signal). The receiver is configured based on the detected interference and relative location thereof. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
A novel receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
A novel receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.
