A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.
H03H 9/205 - Constructional features of resonators consisting of piezoelectric or electrostrictive material having multiple resonators
H03H 9/54 - Filters comprising resonators of piezoelectric or electrostrictive material
H03H 11/04 - Frequency selective two-port networks
H03K 17/687 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices the devices being field-effect transistors
2.
DIFFERENTIAL AMPLIFIER INCLUDING DUAL MAGNETICALLY COUPLED FEEDBACK LOOPS
An amplifier circuit including a first amplifier having a first amplifier input and a first amplifier output and a transformer including a first transformer component having a first primary winding in series with the first amplifier output and a first secondary winding coupled to the first amplifier input. The first primary winding and the first secondary winding are arranged such that a portion of a first magnetic field generated by the first primary winding couples to the first secondary winding through a first magnetically coupled feedback loop. The transformer further includes a second transformer component having a second primary winding in series with an output of a second amplifier and a second secondary winding coupled to an input of the second amplifier input. A portion of a second magnetic field generated by the second primary winding couples to the second secondary winding through a second magnetically coupled feedback loop.
A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.
H03H 11/04 - Frequency selective two-port networks
H03K 17/687 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices the devices being field-effect transistors
A coupled resonator filter (2604) includes a first parallel resonator including a first capacitance (Cl) connected in parallel with a first inductance (LI), a second parallel resonator including a second capacitance (C2) connected in parallel with a second inductance (L2) and a third parallel resonator including a third capacitance (C3) connected in parallel with a third inductance (L3). Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance and the third inductance occurs in accordance with first, second and third coupling factors (k12,k23,k13), respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 3/195 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
A coupled resonator filter including a first parallel resonator (620) including a first capacitance (C1) connected in parallel with a first inductance (L1). The filter includes a second parallel resonator (622) including a second capacitance (C2) connected in parallel with a second inductance (L2) and a third parallel resonator (624) including a third capacitance (C3) connected in parallel with a third inductance (L3). Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors (k12,k23,k13), respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions such that signal cancellation occurs for the direct coupled path, via first and second coupling (k12,k23) and cross-coupled path via third coupling (k13).
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 1/56 - Modifications of input or output impedances, not otherwise provided for
H03F 3/195 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
H03F 3/72 - Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
H03H 7/03 - Frequency selective two-port networks comprising means for compensation of loss
7.
SYSTEM AND METHOD FOR INTEGRATED FILTERING AND AMPLIFICATION
An integrated circuit coupled resonator filter including a low-noise amplifier (2208), first parallel resonator including a first capacitance (C1) connected in parallel with a first inductance (L1), a second parallel resonator including a second capacitance (C2) connected in parallel with a second inductance (L2) and a third parallel resonator including a third capacitance (C3) connected in parallel with a third inductance (L3). Magnetic coupling between the first inductance (L1) and the second inductance (L2), between the second inductance (L2) and the third inductance (L3), and between the first inductance (L1) the third inductance (L3) occurs in accordance with first (k12), second (k23) and third (k13) coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions, such that signals across the direct path, via k12,k23 and across the cross-coupled path, via k13, cancel.
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 3/195 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.
H03H 9/205 - Constructional features of resonators consisting of piezoelectric or electrostrictive material having multiple resonators
H03H 9/54 - Filters comprising resonators of piezoelectric or electrostrictive material
H03H 11/04 - Frequency selective two-port networks
H03K 17/687 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices the devices being field-effect transistors
9.
SYSTEM AND METHOD FOR ADJUSTING AMPLIFIER BIAS USING ENVELOPE TRACKING
H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 3/19 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
H03F 3/24 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
H03F 3/195 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
10.
System and method for adjusting amplifier bias current based on input signal envelope tracking
A system and method which includes receiving an input signal having an envelope and generating an envelope detection signal corresponding to the envelope. A bias current provided to an amplifier circuit is adjusted based upon the envelope detection signal, the amplifier circuit including an amplifier and a transformer. The transformer is configured to establish a magnetically coupled feedback loop from an output of the amplifier to an input of the amplifier. An output signal is provided, by the amplifier circuit, in response to the input signal.
A system and method which includes receiving an input signal and providing, by an amplifier circuit, an output signal in response to the input signal, the output signal having an envelope. An envelope detection signal corresponding to the envelope of the output signal is generated. A bias current provided to an amplifier circuit is adjusted based upon the envelope detection signal. The amplifier circuit includes an amplifier and a transformer, the transformer being configured to establish a magnetically coupled feedback loop from an output of the amplifier to an input of the amplifier.
12122) is configured to establish a magnetically coupled feedback loop from an output of the amplifier (M1, M2) to an input of the amplifier (M1, M2). An output signal is provided, by the amplifier circuit (308), in response to the input signal.
H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 3/19 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
H03F 3/24 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
13.
Amplifier linearization using magnetically coupled feedback provided by a transformer coupled to a balun-based load
An amplifier circuit includes an amplifier having an amplifier input and an amplifier output. The amplifier circuit includes a transformer having a primary winding in series with the amplifier output and a secondary winding coupled to the amplifier input. The primary winding and the secondary winding are arranged such that a portion of a magnetic field generated by the primary winding couples to the secondary winding through a magnetically coupled feedback loop, thereby providing feedback from the amplifier output to the amplifier input. An output load arrangement is connected to the primary winding wherein the output arrangement includes a balun. The amplifier circuit may be implemented as an integrated circuit and where the primary and secondary windings are integrated in different metal layers of the integrated circuit or are otherwise arranged to effect a desired degree of magnetic coupling and feedback from the amplifier output to the amplifier input.
An amplifier circuit including a first amplifier having a first amplifier input and a first amplifier output and a transformer including a first transformer component having a first primary winding in series with the first amplifier output and a first secondary winding coupled to the first amplifier input. The first primary winding and the first secondary winding are arranged such that a portion of a first magnetic field generated by the first primary winding couples to the first secondary winding through a first magnetically coupled feedback loop. The transformer further includes a second transformer component having a second primary winding in series with an output of a second amplifier and a second secondary winding coupled to an input of the second amplifier input. A portion of a second magnetic field generated by the second primary winding couples to the second secondary winding through a second magnetically coupled feedback loop.
A stacked amplifier circuit (600) includes an input stage (610) having first and second input ports respectively defined by inputs of first and second transistors. A transformer arrangement (630) includes first and second primary windings and first and second secondary windings. The first secondary winding is connected to an output of the first input transistor and the second secondary winding is connected to an output of the second input transistor. Portions of the magnetic fields generated by the primary windings couple to their respective secondary windings. An output stage (620) is AC coupled to the first and second secondary windings and has an output connected to the first and second primary windings. The input stage (610) and the output stage (620) are arranged in a stacked configuration such that a bias current of the output stage (620) is reused as bias current for the input stage (610).
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
An amplifier circuit includes an amplifier having an amplifier input and an amplifier output. A transformer disposed to provide a signal for driving a load includes a primary winding in series with the amplifier output. A secondary winding of the transformer is coupled to the amplifier input where the primary winding and the secondary winding are arranged such that a portion of a magnetic field generated by the primary winding couples to the secondary winding so as to establish a magnetically coupled feedback loop from the amplifier output to the amplifier input. A loop gain of the magnetically coupled feedback loop is substantially independent of an impedance of the load and is defined at least in part by a coupling factor and turn-ratio of the transformer. The load may be included within an output load arrangement including a balun.
H03F 1/16 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers
H03F 1/32 - Modifications of amplifiers to reduce non-linear distortion
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 3/21 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
H03F 3/24 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
17.
Amplifier including magnetically coupled feedback loop and stacked input and output stages adapted for DC current reuse
A stacked amplifier circuit includes an input stage having first and second input ports respectively defined by inputs of first and second transistors. A transformer arrangement includes first and second primary windings and first and second secondary windings. The first secondary winding is connected to an output of the first input transistor and the second secondary winding is connected to an output of the second input transistor. Portions of the magnetic fields generated by the primary windings couple to their respective secondary windings. An output stage is AC coupled to the first and second secondary windings and has an output connected to the first and second primary windings. The input stage and the output stage are arranged in a stacked configuration such that a bias current of the output stage is reused as bias current for the input stage.
H03F 1/16 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers
H03F 1/32 - Modifications of amplifiers to reduce non-linear distortion
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 3/21 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
H03F 3/24 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
18.
Method of improving linearity of amplifier circuit including magnetically coupled feedback loop and DC bias current adjustment without impacting amplifier gain
A method of operating an amplifier circuit having a transformer arranged so as to establish a magnetically coupled feedback loop between and output of an amplifier and an input of the amplifier. The method includes providing a DC bias current to the amplifier, and further includes increasing the DC bias current to improve a linearity of the amplifier circuit wherein a transfer gain of the amplifier circuit remains constant when the DC bias current is increased. A loop gain of the magnetically coupled feedback loop is set by selecting a coupling factor and turn-ratio of the transformer.
An amplifier circuit (100) includes an amplifier (102) and a transformer having a primary winding (112) in series with an amplifier output (106) and a secondary winding (108) coupled to an amplifier input (104). The primary winding (112) and the secondary winding (108) are arranged such that a portion of a magnetic field generated by the primary winding (112) couples to the secondary winding (108) through a magnetically coupled feedback loop, thereby providing feedback from the amplifier output (106) to the amplifier input (104). An output load arrangement (120) is connected to the primary winding (112) wherein the output arrangement includes a balun (122). The amplifier circuit (100) may be implemented as an integrated circuit and where the primary (112) and secondary (108) windings are integrated in different metal layers of the integrated circuit.
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
outjnoutjnoutinin) so as to establish a magnetically coupled feedback loop from the amplifier output to the amplifier input. A loop gain of the magnetically coupled feedback loop is substantially independent of an impedance of the load and is defined at least in part by a coupling factor and turn-ratio of the transformer. The load may be included within an output load arrangement including a balun.
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
An amplifier circuit (200) including a first amplifier having a first amplifier input and a first amplifier output and a transformer (214) including a first transformer component (214A) having a first primary winding (212A) in series with the first amplifier output and a first secondary winding (208A) coupled to the first amplifier input. The first primary winding (212A) and the first secondary winding (208A) are arranged such that the first primary winding (212A) couples to the first secondary winding (208A) through a first magnetically coupled feedback loop. The transformer (214) further includes a second transformer component (214B) having a second primary winding (212B) in series with an output of a second amplifier and a second secondary winding (208B) coupled to an input of the second amplifier input. The second primary winding (212B) couples to the second secondary winding (208B) through a second magnetically coupled feedback loop.
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 3/195 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
H03F 3/213 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
22.
METHOD OF IMPROVING LINEARITY OF AMPLIFIER CIRCUIT INCLUDING MAGNETICALLY COUPLED FEEDBACK LOOP AND DC BIAS CURRENT ADJUSTMENT WITHOUT IMPACTING AMPLIFIER GAIN
A method of operating an amplifier circuit (300) having a transformer (314) arranged so as to establish a magnetically coupled feedback loop between and output of an amplifier and an input of the amplifier. The method includes providing a DC bias current to the amplifier, and further includes increasing the DC bias current to improve a linearity of the amplifier circuit (300) wherein a transfer gain of the amplifier circuit (300) remains constant when the DC bias current is increased. A loop gain of the magnetically coupled feedback loop is set by selecting a coupling factor and turn-ratio of the transformer (314).
H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback
H03F 1/22 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively
H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
The present disclosure relates to a radio frequency power amplifier system (200) comprising a first (114) and a second input port (121). The radio frequency power amplifier system (200) comprises a main amplifier (101 ) having an input (107) and an output (108) and a first (102) and a second auxiliary amplifier (122) having respective inputs (109, 129) and outputs (110, 128). The radio frequency power amplifier system (200) comprises an internal load (103) connected to the output (110) of the first auxiliary amplifier (102), a feedback network (104) having an input end (111) connected to the output (110) of the first auxiliary amplifier (102) and an output end (112) connected to the input (109) of the first auxiliary amplifier (102). The radio frequency power amplifier system (200) also comprises a feedforward amplifier (123) having an input (124) and an output (130). The inputs (107, 129, 109) of the main amplifier and the auxiliary amplifiers are interconnected with the first input port (114) at a common input node (113), the output (128) of the second auxiliary amplifier (122) and the second input port (121) are interconnected with the input (124) of the feedforward amplifier (123) at a common node (127) and the outputs (130,108) of the feedforward amplifier (123) and the main amplifier (101) are interconnected at a common output node (125). The main amplifier (101 ) is a replica of the first auxiliary amplifier (102) with an increased gain and the second auxiliary amplifier (122) is a replica of the first auxiliary amplifier (102).
09 - Scientific and electric apparatus and instruments
Goods & Services
radio receivers and transmitters; receivers and transmitters of electronic signals; amplifiers for wireless communications; communications software for connecting wireless devices
09 - Scientific and electric apparatus and instruments
Goods & Services
radio receivers and transmitters; receivers and transmitters of electronic signals; amplifiers for wireless communications; communications software for connecting wireless devices
26.
Logarithmic detector amplifier system for use as high sensitivity selective receiver without frequency conversion
A logarithmic detector amplifying (LDA) system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The LDA system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency.
09 - Scientific and electric apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Software for electrical component design and analysis;
software for automated processing of data and workflow
management. Design and analysis of electrical components.
09 - Scientific and electric apparatus and instruments
42 - Scientific, technological and industrial services, research and design
Goods & Services
Software for electrical component design and analysis; software for automated processing of data and workflow management Electrical systems components design services
