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System and method for transmitter leak-over cancellation

  • US 7,756,480 B2
  • Filed: 02/16/2007
  • Issued: 07/13/2010
  • Est. Priority Date: 02/16/2007
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • transmitting a first signal via a transmit chain in a wireless device, wherein a first portion of the first signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a second signal being received by the wireless device;

    diverting a second portion of the first signal from the transmit chain into cancellation circuitry coupled to the receive chain, wherein the second portion is diverted prior to a location in the transmit chain where leak-over occurs;

    manipulating an amplitude and phase of the second portion; and

    combining the manipulated second portion with the second signal and the first portion to at least partially cancel interference caused by the first portion leaking over into the receive chain.

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