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8149051 |
Solid-state image sensor
A solid-state image sensor capable of suppressing color mixture while suppressing increase of load capacitances of transfer gates and a short circuit between two adjacent transfer gates is...
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8145166 |
Enhanced programmable automatic level control
An enhanced programmable automatic level control loop comprising an input for receiving an input RF signal; a level modulator, wherein the level modulator receives the input RF signal and a control...
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8130874 |
By-pass arrangement of a low noise amplifier
The invention relates to an arrangement for bypassing a low noise amplifier unit in the front stage of a radio receiver, especially intended for the base stations of mobile communication networks....
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8102940 |
Receive frequency band interference protection system using predistortion linearization
A receive frequency band interference protection system includes an input terminal for receiving an input signal and a dividing coupler coupled to the input terminal. The dividing coupler is...
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8089312 |
Amplifying circuit with bypass circuit, and electronic device using the same
An amplifying circuit with a bypassing function includes an input terminal to which a signal is input from an antenna, an amplifier connected to the input terminal, a first inductor connected...
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8086211 |
Magnetically differential input
A magnetically differential input circuit is arranged to define at least two loops, wherein each of the loops traverses the input of a receiving circuit. The loops are physically arranged so that a...
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8054127 |
Feedforward distortion compensation amplifier
A feedforward distortion compensation amplifier includes an adjusting unit for adjusting a gain and a phase of an input signal, a first amplifier for amplifying a signal outputted from the...
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8030998 |
Active feed forward amplifier
An exemplary embodiment of the feed forward amplifier replaces traditional distributed directional couplers, splitters, and delay lines. Moreover, an exemplary feed forward amplifier architecture...
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7944989 |
Quadrature modulation apparatus, method, program, and recording medium
An RF signal, which has been obtained by a quadrature modulation, is corrected without performing quadrature demodulation. There are included an in-phase multiplier, a quadrature multiplier, an...
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7940106 |
Apparatus for generating a correction signal
An apparatus for generating a correction signal for linearizing an output signal of a non-linear element includes a correction signal generator. The correction signal generator is configured to...
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7928800 |
Programmable compensation network for operational amplifiers
Systems and methods for implementing a programmable network for a multimode conditionally stable operational amplifier are disclosed.
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7915954 |
Amplifier predistortion and autocalibration method and apparatus
Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the...
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7907678 |
Power series predistorter and control method thereof
In a distortion generation path of a power series predistorter, a frequency characteristic compensator that adjusts the frequency characteristic of a distortion component is provided in series with...
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7902922 |
Feedforward amplifier and control method thereof
In a feedforward amplifier (200) including a signal cancellation circuit (10) and a distortion eliminating circuit (20), a harmonic reaction amplifier (130) is used as a main amplifier of the...
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7869770 |
Apparatus, methods and articles of manufacture for a multi-band switch
A single-die multi-band switch includes a plurality of transmitter ports and a plurality of receiver ports, any one of which is selected to be connected to an antenna port. At least some of these...
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7856105 |
Apparatus and method for processing of amplifier linearization signals
A feed-forward amplifier includes a main amplifier having input signals and amplified output signals and an error amplifier for amplifying distortion signals to be added to the amplified output...
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7848403 |
Enhanced reconditioning equalizer filter chain for multi-carrier signals
A technique for enhanced reconditioning equalizer filter chain for multi-carrier signals is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter...
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7834688 |
Linearised power amplifier
A linearized power amplifier including a predistorter and a feedforward circuit is described. By using both a predistorter and a feedforward cancellation system the linearization of the amplifier...
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7817713 |
Enhanced reconditioning equalizer filter for non-constant envelop signals
A technique for enhanced reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter,...
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7804915 |
Distortion compensation circuit and method
The invention relates to methods and circuits for compensating linear in-band distortions such as those occurring in RF circuits of broad band communication systems. A low-rate sampling is used to...
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7796687 |
Enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies
A technique for enhanced reconditioning equalizer filter chain for multi-carrier signals with different technologies is described. The input to a transmitter chain is modified by an enhanced...
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7791413 |
Linearizing technique for power amplifiers
Embodiments described herein relate to amplification circuits. In some embodiments the amplification circuit includes a power amplifier, a feedforward error compensation loop, and phase feedback...
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7756486 |
Transmitter and receiver impedance control using shunt switches
Circuits, methods, and apparatus that provide isolation between receive and transmit circuits in a wireless transceiver. One example provides switches that can be included on an integrated circuit...
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7729420 |
Reconditioning equalizer filter for OFDM and non-OFDM signals
A technique for a reconditioning equalizer filter for OFDM and non-OFDM signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being...
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7729419 |
Reconditioning equalizer filter using convolution
A technique for a reconditioning equalizer filter using convolution is described. The input to a transmitter chain is modified by a reconditioning equalizer filter using convolution prior to being...
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7702301 |
Method and apparatus for distortion correction of RF amplifiers
A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining an error signals with the appropriate phase shift with input signals to be...
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7693497 |
Spurious energy correlation for control of linear power amplifiers
A control system for a linear feed-forward amplifier, using the ratio of measured spurious energy. Measuring receivers are coupled to two monitoring points to measure the spurious energy content in...
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7684774 |
Systems and methods for recovery of a sub-carrier signal from a stereophonic multiplexed signal
Disclosed herein are systems and methods for recovering a sub-carrier signal from a multiplexed signal having an embedded pilot tone signal. The recovery system includes circuitry for recovering a...
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7679441 |
High frequency power amplifier
A high frequency power amplifier comprises: an amplifier that amplifies signals received from a first input terminal and outputs amplified signals to an output terminal; a bypass route that...
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7679440 |
Feedforward amplifier
There is disclosed a feedforward amplifier for compensating for distortion produced in an amplifier. The feedforward amplifier controls the phase in a vector adjuster effectively. The feedforward...
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7667537 |
Method for correcting a harmonic distortion of a power bridge, in particular for a class D amplifier
To correct for harmonic distortion of a power bridge, the form of a pulse at the output of the power bridge and of estimate of non idealities under different current conditions is acquired. An...
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7656964 |
Forward and reverse VSWR insensitive power detection using phase shifting and harmonic filtering
A system for detecting both forward and reverse power of a power amplifier in the presence of harmonics created by the power amplifier is provided. A forward power detection system receives...
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7646239 |
Feed-forward amplifier
There is provided a feed-forward amplifier which enables a predistortion circuit to obtain sufficient distortion compensation effects even if ambient temperature or the like changes. The...
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7642848 |
Variable gain amplifying apparatus and wireless communication apparatus
A variable gain amplifying apparatus has an amplifier, one or more first switching elements connected in parallel to the amplifier, and a phase shifter connected in series to the first switching...
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7642850 |
Feedforward linearization of RF power amplifiers
RF amplifier system (200) incorporating feedforward linearization. The system includes a digital waveform source (202) generating digital data s(t) representative of at least one analog signal. The...
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7595689 |
Predistorter
A predistorter arrangement for linearizing an amplifier. The predistorter arrangement is designed to compensate for IMD distortion in an amplifier using polynomial approximation techniques. The...
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7551687 |
Distortion compensating apparatus
A distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not...
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7541868 |
Delay modulator pre-distortion circuit for an amplifier
A circuit for pre-distorting a signal input to an amplifier includes a signal divider operable for dividing an input signal into signal portions that travel in a primary path and a secondary path....
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7538632 |
Method and apparatus for controlling adaptive circuits
A feed-forward amplifier having a signal cancellation loop including a cancellation node that includes a gain controller and a phase controller. Each controller provides a discrete tap steering...
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7536161 |
Magnetically differential input
A magnetically differential input circuit is arranged to define at least two loops, wherein each of the loops traverses the input of a receiving circuit. The loops are physically arranged so that a...
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7525390 |
Circuit for converting a differential signal into a non-differential signal, and RF transmitter comprising such a circuit
A circuit for converting a differential signal into a nondifferential signal comprising first and second inputs respectively receiving first and second components of a differential signal. The...
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7522672 |
Digital branch calibrator for an RF transmitter
The present invention provides a digital (computational) branch calibrator which uses a feedback signal sensed from an RF transmit signal path following the combining stage of LINC circuitry of a...
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7515882 |
Apparatus, methods and articles of manufacture for a multi-band switch
The invention is directed to a multi-band switch having a transmitter switching section with a plurality of transmission ports, and a receiver switching section with a plurality of receiver ports,...
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7486939 |
Apparatus for removing distortions created by an amplifier
A power amplifier has a non-linear low power pre-distortion amplifier (112) for transforming a carrier signal (111) to a pre-distorted signal (113) having a carrier component with out-of-phase...
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7479827 |
Multi-mode power amplifier with high efficiency under backoff operation
A multi-mode RF amplifier is disclosed having high and low output power modes and two power paths. A first RF amplifier delivers power to both paths. When the multi-mode RF amplifier is biased into...
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7474237 |
Circuits and methods for using error correction in power amplification and signal conversion
Circuits and methods for using error correction in power amplification and signal conversion are disclosed herein. In some embodiments, methods for using error correction in power amplification and...
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7459974 |
System and method for distortion cancellation in amplifiers
A distortion cancellation amplifier is described having a main amplifier and an error amplifier. The main amplifier, in response to an input signal, generates an output signal having an amplified...
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7456688 |
Signal extraction circuit and distortion-compensated amplifier incorporating the same
To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator...
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7447484 |
Timing controller and timing control method
A timing controller is disclosed that includes: an amplifier part configured to amplify a first input signal in accordance with a control voltage, the first input signal being one of a transmission...
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7436259 |
Amplification apparatus
An amplification apparatus that has a distortion detection loop that detects distortion components contained in an amplified signal to be amplified that is amplified by an amplifier 3, and a...
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