Patent ID: 6069525
Filing Date: 2000-05-30
Classification: H03F

Abstract:
An amplifier circuit comprising:a first amplifier stage having a first supply voltage input for receiving a supply voltage and a first signal input for receiving a signal to be amplified and a bias signal;a second amplifier stage having a second supply voltage input for receiving said supply voltage and a second signal input for receiving said signal to be amplified and said bias signal; anda control circuit having a supply voltage output coupled to said first and second supply voltage inputs and having first and second bias signal outputs respectively coupled to said first and second signal inputs, and having a mode select input for receiving a mode select signal, said control circuit for varying said supply voltage and said bias signal in response to said mode select signal,wherein said mode select signal is indicative of first and second operational modes, and wherein said control circuit increases said supply voltage and biases said first amplifier stage to an on state when in said first operational mode, and wherein said control circuit decreases said supply voltage and biases both said first and second amplifier stages to an on state when in said second operational mode.