CMOS amplifiers with frequency compensating capacitors
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United States of America Patent
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Apr 10, 2007
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app pub date -
Jul 27, 2006
filing date -
Sep 1, 2004
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Abstract
The frequency and transient responses of a CMOS differential amplifier are improved by employing one or more compensating capacitors. A compensating capacitor coupled to a differential input of the CMOS differential amplifier is used to inject current into the differential input, such that the net current flow through the gate-to-drain capacitance of a MOS input transistor approaches zero. Thus, the Miller effect with respect to that MOS input transistor is substantially reduced or eliminated, resulting in increased frequency and transient responses for the CMOS differential amplifier. In one embodiment, the CMOS differential amplifier is a CMOS current mirror differential amplifier.
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