Patent ID: 7209006
Filing Date: 2007-04-24
Classification: H03F

Abstract:
1. An apparatus including a differential amplifier, comprising: tail current source circuitry responsive to at least a first bias signal by providing a second bias signal; differential amplifier circuitry coupled to said tail current source circuitry and responsive to at least said second bias signal, third and fourth bias signals, and a differential input signal by providing a differential output signal; bias circuitry coupled to said differential amplifier circuitry and responsive to at least a fifth bias signal by providing said third and fourth bias signals; and control feedback circuitry coupled to said tail current source circuitry and said bias circuitry, and responsive to at least said second bias signal by providing at least said fifth bias signal, wherein at least said fifth bias signal is modulated in relation to a modulation of said second bias signal such that said third and fourth bias signals are modulated in an inverse relation to said second bias signal modulation.