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PHASE CORRECTING APPARATUS AND DISTORTION COMPENSATING APPARATUS FOR RADIO TRANSMITTER

  • US 20100232481A1
  • Filed: 03/10/2010
  • Published: 09/16/2010
  • Est. Priority Date: 03/12/2009
  • Status: Active Grant
First Claim
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1. A phase correcting apparatus for a radio transmitter which obtains a first radio signal based on a first baseband signal, the phase correcting apparatus comprising:

  • a demodulator which demodulates a feedback signal from which a part of the first radio signal is extracted by a first carrier wave signal and which generates a second baseband signal,a modulator which modulates a difference signal between the first baseband signal and the second baseband signal by a second carrier wave signal and which outputs a second radio signal,a power amplifier which amplifies the second radio signal to obtain the first radio signal,a phase difference detector which detects a phase difference between the first baseband signal and the second baseband signal, anda phase rotator which rotates any phase of the first baseband signal, the second baseband signal, the first carrier wave signal, or the second carrier wave signal as a target phase correction amount,wherein the phase difference detector converts a desired analog signal which is obtained by multiplying the first baseband signal and the second baseband signal into a digital signal, and which detects the phase difference based on digital data.

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