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Control of power amplifiers in devices using transmit beamforming

  • US 20060116087A1
  • Filed: 01/06/2006
  • Published: 06/01/2006
  • Est. Priority Date: 03/21/2002
  • Status: Active Grant
First Claim
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1. A radio transmitter, comprising:

  • a baseband signal processor configured to weight each of a plurality of digital baseband transmit signals with a corresponding one of a plurality of transmit weights to produce a plurality of digital weighted signals;

    a digital to analog converter configured to convert each of the plurality of transmit weights to an analog bias signal;

    a plurality of amplifiers, each amplifier configured to amplify an upconverted digital weighted signal as a corresponding radio frequency signal;

    a plurality of bias circuits, each bias circuit corresponding to one of the plurality of amplifiers and configured to control the bias of the corresponding amplifier according to the transmit weights applied to the corresponding baseband transmit signal; and

    a plurality of antennas, each antenna corresponding to one of the plurality of amplifiers, configured to simultaneously transmit the radio frequency signals.

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