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Quadrature voltage controlled oscillators with phase shift detector

  • US 7,271,622 B2
  • Filed: 06/22/2006
  • Issued: 09/18/2007
  • Est. Priority Date: 06/10/2004
  • Status: Active Grant
First Claim
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1. A phase error detector (PED) for detecting a phase error in a quadrature signal, said PED comprising:

  • a first analog OR gate having an input for receiving a positive in-phase (‘

    I’

    ) signal and a positive quadrature-phase (‘

    Q’

    ) signal;

    a second analog OR gate having an input for receiving a negative ‘

    I’

    signal and a negative ‘

    Q’

    signal;

    first circuitry for summing the output from said first analog OR gate and said second analog OR gate to generate a first circuitry output;

    a third analog OR gate having an input for receiving a positive ‘

    I’

    signal and a negative ‘

    Q’

    signal;

    a fourth analog OR gate having a first input for receiving a negative ‘

    I’

    signal and a positive ‘

    Q’

    signal; and

    ,second circuitry for summing the output from said third analog OR gate and said fourth analog OR gate and there from generating a second circuitry output;

    whereby the difference between said first circuitry output and said second circuitry output is a signal proportional to a phase error between the ‘

    I’

    signal and the ‘

    Q’

    signal of the quadrature signal.

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