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US20110090011: POWER AMPLIFIER

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Filing Information

Inventor(s) De-Cheng Chang · Yu-Cheng Hsu ·
Assignee(s) INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE ·
Application Number US12727261
Filing date 03/19/2010
Publication date 04/21/2011
Predicted expiration date 03/19/2030
U.S. Classifications 330/296  · 330/185  ·
International Classifications H03F304  ·
Kind CodeA1
12 Claims, 3 Drawings


Abstract

An adaptive bias power amplifier including an amplifier, a signal coupler, a power detector and a bias control circuit is provided. The signal coupler is connected to an input terminal of the amplifier. The power detector is connected to the signal coupler, and detects an input power of the amplifier via the signal coupler. The bias control circuit is connected to an output terminal of the power detector and the input terminal of the amplifier. The bias control circuit adjusts a gate bias of the amplifier in accordance with a detecting result of the power detector.

Independent Claims | See all claims (12)

  1. 1. A power amplifier, comprising: an amplifier; a signal coupler, connected to an input terminal of the amplifier; a power detector, connected to the signal coupler, for detecting an input power of the amplifier; and a bias control circuit, connected to an output terminal of the power detector and the gate of the amplifier, and adjusting a gate bias of the amplifier in accordance with a detecting result of the power detector.

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