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PLL lockout watchdog

  • US 6,782,068 B1
  • Filed: 06/30/2000
  • Issued: 08/24/2004
  • Est. Priority Date: 06/30/2000
  • Status: Active Grant
First Claim
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1. A circuit configured to detect a lockout condition of a phase lock loop (PLL) circuit, wherein (A) said circuit is configured to forcibly correct an operating frequency of the PLL circuit by (i) switching to a normal path comprising a feedback of said operating frequency when said lockout condition is not detected and (ii) switching to a recovery path, separate from said feedback of said operating frequency, when said lockout condition is detected and (B) said circuit comprises a first counter configured to (a) count an output reference frequency and (b) initiate a reset of said circuit.

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