Patent ID: 6617931
Filing Date: 2003-09-09
Classification: H02M,H03F

Abstract:
A two-stage amplifier that provides a two-stage amplifier output signal, said two-stage amplifier comprising:a first amplifier stage that receives a first amplifier input signal, and provides a first amplifier output signal; a second amplifier stage that includes a second amplifier input lead, and provides the two-stage amplifier output signal; a coupling capacitor having a first lead and a second lead, wherein said first lead receives said first amplifier output signal, and said second lead is connected to said second amplifier input lead such that said coupling capacitor is connected in series between said first and second amplifier stages; and a charge pump that generates a bias voltage that is applied to said coupling capacitor via said first and second leads to maintain the time average of the voltage across said coupling capacitor constant, wherein said two-stage amplifier output signal is feedback and coupled to an input signal to provide said first amplifier input signal.