Patent ID: 6329809
Filing Date: 2001-12-11
Classification: G01R,H03F

Abstract:
Amplifier circuitry comprising:a) a radio frequency power amplifier for amplifying a radio frequency input signal and having:i) a radio frequency amplifier input for receiving the radio frequency input signal,ii) a bias input for receiving a bias signal for biasing the radio frequency power amplifier, andiii) a power amplifier output providing an amplified radio frequency signal;b) a first transistor circuit having:i) a first input for receiving the radio frequency input signal,ii) a first bias input for receiving the bias signal, andiii) a first output providing a first output signal having a bias component and a radio frequency component proportionally smaller than the amplified radio frequency signal; andc) a second transistor circuit having:i) a second bias input for receiving the bias signal, andii) a second output for providing second output signal corresponding to the bias component.