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Multi-mode radio with interference cancellation circuit

  • US 7,962,170 B2
  • Filed: 10/22/2008
  • Issued: 06/14/2011
  • Est. Priority Date: 05/27/2003
  • Status: Expired due to Fees
First Claim
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1. A multi-mode wireless transmit/receive unit (WTRU) comprising:

  • a transmit/receive switch electrically coupled to an antenna and a triplexer;

    a first coupler having a first output port electrically coupled to the antenna and the triplexer;

    a second coupler having a first input port electrically coupled to the triplexer;

    a bandpass filter electrically coupled to a second output port of the first coupler;

    a vector multiplier electrically coupled to the bandpass filter and a second input port of the second coupler, the vector multiplier configured to reduce or eliminate interference of signals routed through the second coupler, wherein the vector multiplier adjusts the phase and amplitude of the interference; and

    an interference canceler control circuit configured to provide in-phase voltage and quadrature voltage to minimize noise.

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