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Method and apparatus for wireless phone transmit power amplification with reduced power consumption

  • US 6,313,698 B1
  • Filed: 09/24/1999
  • Issued: 11/06/2001
  • Est. Priority Date: 09/24/1999
  • Status: Expired due to Term
First Claim
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1. 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; and

    a 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.

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