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Charge-based frequency locked loop and method

  • US 5,841,324 A
  • Filed: 06/20/1996
  • Issued: 11/24/1998
  • Est. Priority Date: 06/20/1996
  • Status: Expired due to Term
First Claim
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1. A frequency locked loop (FLL) comprising:

  • a charge integrating amplifier;

    a voltage controlled oscillator which operates in response to an output voltage from said amplifier;

    a switched-capacitor circuit for providing an input current to said amplifier which is a function of a combination of a reference current related to a reference frequency and a feedback current related to an output frequency of said voltage controlled oscillator,whereby the input current varies in response to the output frequency to lock the FLL on a frequency.

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