Patent ID: 6313698
Filing Date: 2001-11-06
Classification: H03F,H04B

Abstract:
An RF amplifier for a wireless phone comprising:a pre-driver amplifier;a driver amplifier;a bandpass filter with an input connected to an output of the driver amplifier;a high power amplifier;a first RF switch having an input connected to an output of the pre-driver amplifier with a first switch output connected to an input of the driver amplifier;a second RF switch having an output connected to an input of the high power amplifier, a first input connected to the output of the bandpass filter, and a second input connected to a second output of the first RF switch such that the driver amplifier and bandpass filter can be switchably bypassed; anda power control logic circuit that inputs data control bits and provides corresponding output signals that control the first and second RF switch positions and controls a bias current of the high power amplifier to one of a plurality of active bias levels.