Patent ID: 6646510
Filing Date: 2003-11-11
Classification: H03F,H03G

Abstract:
An amplifier comprising:a first input port for receiving a signal for amplification; a second input port for receiving a control signal; a first amplifying stage, having a first gain and a first small signal gain, coupled to the first input port for receiving the signal for amplification and for generating a first amplified signal at an output port, the first amplified signal being an amplified version of the signal for amplification; at least a shunting circuit for varying a signal power level of at least one of the input signal and the first amplified signal in dependence upon the control signal; and, a biasing circuit for receiving the control signal and for variably biasing the first amplifying stage in dependence upon a bias signal received through a bias port, wherein, in use, the shunting circuit and the biasing circuit act in cooperation to provide any of a plurality of predetermined power profiles for the first amplified signal and the first small signal gain.