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Calibration of I-Q balance in transceivers

DC
  • US 7,346,313 B2
  • Filed: 03/04/2003
  • Issued: 03/18/2008
  • Est. Priority Date: 03/04/2002
  • Status: Active Grant
First Claim
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1. A transceiver system for transmitting and receiving data using both I and Q channels, comprising:

  • a transmit chain;

    a receive chain; and

    a calibration subsystem comprising a signal path for injecting a calibration RF signal, generated in response to and as a function of a signal generated through the transmit chain, into the receive chain of the transceiver in order to independently calibrate the I-Q gain balance of the both transmit and receive chains in their entirety;

    wherein the calibration RF signal includes a calibration cycle, and the calibration cycle determines transmitter I-Q gain settings which minimize an observable indicator while holding receive I-Q gain settings constant, and which in turn determines receiver I-Q gain settings which minimizes the observable indicator while holding the transmit I-Q gain settings constant.

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