Patent
Transmission device and radio communication device
TLDR
In this paper, a pre-stage side of a high-frequency power amplifier changes an amplitude of the high frequency phase modulation signal according to a base band amplitude modulation signal and a gain control signal.Abstract:
A transmission device having a preferable power efficiency and a wide control range of transmission output power. A pre-stage side of a high-frequency power amplifier changes an amplitude of a high-frequency phase modulation signal according to a base band amplitude modulation signal and a gain control signal. A variable gain amplifier changes the amplitude of the high-frequency phase modulation signal according to the base band amplitude modulation signal and the gain control signal, so that the base band amplitude modulation signal is supplied to an amplifier via a linear-log converter.read more
Citations
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Patent
Power amplifier and radio wave transmitter having the same
TL;DR: In this paper, the average power of the output signal of the power amplifier was adjusted by controlling the total gains of the plurality of high-frequency power amplifiers (15 - 1 to 15 - n ).
Patent
RF power amplifier controller circuit including calibrated phase control loop
TL;DR: In this article, the amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of output signal.
Patent
Power amplifier controller circuit
TL;DR: In this article, the amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of output signal.
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Multimedia data transmitting apparatus and multimedia data receiving apparatus
TL;DR: In this article, the authors propose a technique which allows the terminal to properly detect and process version up of section data even when random access for trick play, and the like, is performed.
Patent
Amplitude error de-glitching circuit and method of operating
TL;DR: In this paper, the amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of output signal.
References
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Patent
Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters
TL;DR: In this paper, a method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF power amplifier operating at or near saturation, an RF driver amplifier, a high-level amplitude modulator for the final amplifier, and a means for determining the supply-voltage input to the final amplifiers and for controlling the amplitude of the drive.
Patent
Communications signal amplifiers having independent power control and amplitude modulation
TL;DR: In this article, the amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, which is unaffected by possible nonlinearities of such circuitry.
Patent
Power supply processing for power amplifiers
TL;DR: In this article, a power supply processing circuit includes a first switched converter stage and a second linear stage, and a saturation detector is used to control the first stage such that the second stage operates efficiently just short of saturation, thereby avoiding distortion.
Patent
Systems and methods for amplification of a communication signal
Thomas Marra,Lennart Mathe +1 more
TL;DR: In this article, an EER amplifier system for CDMA signal amplification includes an amplitude bandwidth reduction module included in an amplitude signal component path, for controlling an RF amplifier, and an amplitude and/or phase component reduction module is included in a phase component path.
Patent
Method and apparatus for linearizing an efficient class D/E power amplifier using delta modulation
TL;DR: In this paper, a delta-modulated magnitude amplifier is used to amplify the magnitude component of an RF power amplifier that employs envelope elimination and restoration, which introduces a smaller amount of nonlinearity than traditional approaches, which are based upon pulse-width modulation.