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Method for calibrating a VCO characteristic and automatically calibrated PLL having a VCO

  • US 6,175,282 B1
  • Filed: 10/08/1999
  • Issued: 01/16/2001
  • Est. Priority Date: 10/09/1998
  • Status: Expired due to Term
First Claim
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1. A method for calibrating an oscillation frequency versus a control voltage characteristic of a voltage controlled oscillator (VCO) in which an oscillation frequency is changed responsive to a control voltage Vc, comprising:

  • performing a calibration to establish an oscillation frequency of said VCO at a maximum target frequency value when a control voltage input to said VCO reaches a predetermined reference voltage; and

    verifying that said control voltage is within a predetermined operating range when said oscillation frequency is established at a minimum target frequency value.

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