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Test signal generation and application in receivers

  • US 9,059,879 B2
  • Filed: 07/08/2011
  • Issued: 06/16/2015
  • Est. Priority Date: 07/08/2011
  • Status: Active Grant
First Claim
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1. A receiver circuit, comprising:

  • a test signal generation component configured to generate a single side band (SSB) test signal independent from a signal received by a reception path of the receiver circuit, wherein the test signal generation component comprises;

    a SSB signal generator configured to generate an IQ baseband signal having an in-phase signal component and a quadrature phase signal component;

    first and second magnitude setting blocks located downstream of the SSB signal generator and respectively configured to selectively vary a magnitude of the in-phase signal component based upon a first amplitude setting word and to vary a magnitude of the quadrature phase signal component based upon a second amplitude setting word; and

    an IQ modulator configured to receive the IQ baseband signal and to generate the SSB test signal by modulating the IQ baseband signal onto a local oscillator signal,a test signal injection point configured to provide the SSB test signal to the reception path of the receiver circuit; and

    a mixer located within the reception path at a location downstream of the test signal injection point, the mixer configured to mix the SSB test signal with the local oscillator signal to generate a down-converted output signal indicative of an error in the reception path.

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