Methods and Circuits for Controlling Amplifier Gain Over Process, Voltage, and Temperature
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United States of America Patent
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Issued Date -
Jun 7, 2012
app pub date -
Dec 2, 2011
filing date -
Dec 3, 2010
priority date (Note) -
Abandoned
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Abstract
A receiver includes an amplifier and a transconductance bias circuit. The amplifier gain is largely determined by transconductance and load impedance. The transconductance bias circuit varies the transconductance in inverse proportion to the load impedance to maintain the gain over process, voltage, and temperature. Differential amplifiers can use separate transconductance bias circuits for each amplifier leg, and the bias circuits can be independently controlled to minimize common-mode gain and voltage offsets.
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