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Modem having a phase corrector and a voltage controlled oscillator implemented using a multi-stage ring oscillator

  • US 5,438,301 A
  • Filed: 07/25/1994
  • Issued: 08/01/1995
  • Est. Priority Date: 07/25/1994
  • Status: Expired due to Term
First Claim
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1. A carrier generator circuit for use in a modem employed in a wireless communication system, comprising:

  • a voltage controlled oscillator comprising an N-stage ring oscillator to generate N balanced vectors of equal magnitude and arbitrary phase difference; and

    a phase corrector to add two of said balanced vectors to generate a sum vector and to subtract said two of said balanced vectors to generate a difference vector, said sum vector and difference vector having a phase difference of 90 degrees, said sum vector representing an I (in-phase) carrier signal component and said difference vector representing a Q (quadrature-phase) carrier signal component.

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