Patent
Self-controlled high efficiency power amplifier
Gordon Kent Walker
- 01 Jun 2001
62
TL;DR: In this article, a novel and improved circuit and method for amplifying an input signal was proposed, which includes an amplifier circuit having an input for receiving the input signal, and an amplifier control circuit, coupled to the amplifier circuit, for varying a supply power and a device periphery of the amplifier circuits in response to an amplitude envelope of the input signals.
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Abstract: A novel and improved circuit and method for amplifying an input signal. The circuit includes an amplifier circuit having an input for receiving the input signal, and an amplifier control circuit, coupled to the amplifier circuit, for varying a supply power and a device periphery of the amplifier circuit in response to an amplitude envelope of the input signal. In this manner, the amplifier control circuit can control the linearity and the efficiency of the amplifier circuit using the characteristics of the input signal itself, without relying on any external processing.
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Citations
Patent
Multi-mode amplifier system
Ian Stuart Robinson,Frank Winter +1 more
- 24 Jun 2003
TL;DR: In this article, an amplifier system switches between modes of operation based upon a characteristic of an input signal relative to a first threshold level and a second threshold level, and a mode selector selects the operation mode by transmitting an amplitude modulated signal plus a variable headroom voltage to a supply terminal of a power amplifier during the envelope tracking mode, an amplitude and phase modulated input signal during the polar mode and a substantially constant amplitude signal to the supply terminal during the linear mode.
239
Patent
Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios
Wen-Yen Chan,Nasserullah Khan,Qingzhong Jiao,Xin Jin,Nagula Tharma Sangary,Michael F. Habicher +5 more
- 20 Feb 2004
TL;DR: In this article, a power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station.
152
Patent
Polar and linear amplifier system
Frank Winter,Ian Robinson,Walter R. Demore +2 more
- 24 Jun 2003
TL;DR: In this paper, an amplifier system is provided that switches between operation in a polar mode and a linear mode based on a characteristic of an input signal relative to a threshold level, and a mode selector controls whether polar components of the input signal are sent to a power amplifier or whether a composite signal is amplified.
107
Patent
N-way rf power amplifier circuit with increased back-off capability and power added efficiency using selected phase lengths and output impedances
Raymond Sydney Pengelly,Simon Wood +1 more
- 08 Apr 2004
TL;DR: In this article, a carrier amplifier for amplifying an RF signal over a first range of power and with a power saturation level below the maximum of the broad spectrum of power is disclosed, where a plurality of peak amplifiers are connected in parallel with the carrier amplifier.
101
Patent
High-frequency amplifier
Shintaro Shinjo,Kazutomi Mori,H. Joba,Hiroaki Nagano,Mitsuru Motizuki,Yukio Ikeda,Noriharu Suematsu +6 more
- 29 Jun 2001
TL;DR: In this article, a high-frequency amplifying section (2) amplifies an input highfrequency signal with transistors (12-1) to 12-N to suppress a sudden gain variation with a change in the amplitude of the input high frequency signal.
91
References
Patent
Method and apparatus for high efficiency wideband power amplification
Bernard Eugene Sigmon,Frederick H Raab,James Roger Ii Clark +2 more
- 06 Oct 1997
TL;DR: In this article, an envelope detector (220), an adaptive split band modulator (270), and a power amplifier (260) are used for efficient power amplification of a wideband signal with correspondingly wide modulation bandwidth.
69
Patent
Method and apparatus for increasing the linearity of the phase and gain of a power amplifier circuit
Michael Joseph Shaw
- 06 Aug 1998
TL;DR: In this article, a method and apparatus for increasing the linearity of the phase and gain of an amplifier circuit is presented, where the amplifier circuit maintains linearity by monitoring the power levels of the input signal, and adjusting the supply voltage level(s) of the amplifier (18), based upon the measured input power levels.
29
Patent
AM-PM Conversion for measuring delay distortion
Norris C. Hekimian
- 14 Jun 1978
TL;DR: In this article, a measure of delay distortion produced in a circuit under test is provided by applying a purely amplitude-modulated carrier to the circuit and detecting the resulting phase modulation.
5
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