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Patent

Multi-channel audio power amplifier

Kenji Yokoyama
TLDR
In this paper, a multi-channel audio power amplifier is arranged to amplify, by an analog amplifying circuit, high frequency range components of an audio signal and to amplify low frequency range component of said signal by a class D amplifier, to enhance the power efficiency of the amplifier.
Abstract: 
A multi-channel audio power amplifier is arranged to amplify, by an analog amplifying circuit, high frequency range components of an audio signal and to amplify low frequency range components of said signal by a class D amplifying circuit, to thereby enhance the power efficiency of the amplifier. The carrier frequency of the class D amplifying circuit is set lower than that employed conventionally, to eliminate spurious radiation of the carrier signal.

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Patent

Apparatus and method for efficiently amplifying wideband envelope signals

Lennart Mathe, +3 more
Abstract: Systems and methods for amplifying an RF input signal include employing a moderately power efficient wide bandwidth device, such as an AB-type amplifier, to amplify the power residing in the high frequency components of the input signal, and a highly power efficient narrow bandwidth device, such as a synchronous buck DC/DC converter, to amplify the power residing in the low frequency components of the input signal. The amplified low frequency components and high frequency components are then combined to produce an amplified replica of the RF input signal. A positive feedback loop is provided between the output of the AB-type amplifier and the input of the DC/DC converter to provide stability to the amplified RF signal. A negative feedback loop is provided between the output of the DC/DC converter and the input of the AB-type amplifier to minimize interference introduced by the DC/DC converter.
Patent

Method and apparatus for high efficiency power amplification

Ronald Gene Myers, +1 more
TL;DR: In this paper, a method and apparatus for efficient power amplification over a wide dynamic range and for a number of modulation formats includes a carrier amplifier (30) and a peaking amplifier (40).
Patent

Power combining power supply system

Vikas Vinayak, +2 more
TL;DR: In this article, a power supply system comprises a low-speed power supply and a high speed power supply configured to operate in first and second frequency ranges, respectively, and generate first output and second output, respectively.
Patent

Constant gain nonlinear envelope tracking high efficiency linear amplifier

Nikolai Maslennikov, +2 more
TL;DR: In this paper, an envelope tracking radio frequency (RF) power amplifier having an adaptive envelope signal processing circuit is disclosed, where the voltage control provides for constant power amplifier gain across the input signal dynamic range, thus minimizing power amplifier amplitude distortions and extending the useful power amplifier linear dynamic range up to saturation point.
Patent

Class D amplifier with switching control

David S. Hall
TL;DR: In this paper, a class D amplifier utilizing first and second switches (22, 24) connected in series to conduct current from a common source in a sequential manner is presented, where switches have a common output note between them.
References
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Patent

Linearized three-state switching amplifier

Thomas P. Kohler
TL;DR: In this article, a pulse width modulated switching amplifier is provided for amplifying an analog signal, and means are provided for producing positive and negative signals representative of positive or negative excursions of the analog signal.