Patent ID: 7405625
Filing Date: 2008-07-29
Classification: H03F,H03M

Abstract:
1. An amplifier that provides an output signal in response to an input signal and a common-mode reference signal, comprising: a transistor that has a control terminal and provides a tail current whose amplitude corresponds to signals at said control terminal; a differential pair of transistors that respectively have first and second current terminals and are coupled to steer said tail current between said first and second current terminals in response to said input signal to thereby provide said output signal; a first feedback path coupled from said first and second current terminals to said control terminal and configured to provide a feedback signal that responds to said common-mode reference signal and that has a first feedback gain and a first feedback bandwidth; and a second feedback path coupled from said first and second current terminals to said control terminal and configured to provide a second feedback gain that is less than said first feedback gain and a second feedback bandwidth that is greater than said first feedback bandwidth.