Bias control circuit
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United States of America Patent
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Aug 4, 2015
Grant Date -
Dec 12, 2013
app pub date -
Jan 17, 2012
filing date -
Mar 3, 2011
priority date (Note) -
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Abstract
The problem to be solved is to alleviate the distortion characteristic of an amplifier and to prevent the drop in gain with respect to a low-level high-frequency signal. A bias control circuit (10) for controlling the bias of an amplifier (20) which amplifies a high-frequency signal is provided herein with a detector (11) for detecting the envelope of the high-frequency signal, a first bias circuit (12) for supplying a constant bias current to the amplifier (20) and a second bias circuit (14) for supplying a bias current that varies with the variation of the level of the envelope of the high-frequency signal to the amplifier.
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