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Active Cancellation of Transmitter Leakage in a Wireless Transceiver

  • US 20090213770A1
  • Filed: 02/27/2008
  • Published: 08/27/2009
  • Est. Priority Date: 02/27/2008
  • Status: Active Grant
First Claim
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1. A method of cancelling transmitter leakage into the receive path of a frequency-duplexing transceiver, comprising:

  • generating a radio-frequency (RF) cancellation signal from a transmitter signal;

    combining the RF cancellation signal with a received RF signal to obtain a combined RF signal comprising a residual transmitter leakage component;

    converting the residual transmitter leakage component of the combined RF signal to a down-converted signal at baseband or at an intermediate frequency;

    detecting a magnitude of the residual transmitter leakage component from the down-converted signal; and

    adjusting the phase or amplitude of the RF cancellation signal, or both, based on the detected magnitude, to reduce the residual transmitter leakage component.

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