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Low-latency start-up for a monolithic clock generator and timing/frequency reference

  • US 7,307,486 B2
  • Filed: 09/21/2005
  • Issued: 12/11/2007
  • Est. Priority Date: 03/22/2004
  • Status: Active Grant
First Claim
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1. A start-up apparatus for a free-running harmonic oscillator, the apparatus comprising:

  • a first current source adapted to provide a first current;

    a second current source adapted to provide a second current, the second current source having at least one complementary to absolute temperature (CTAT) configuration, proportional to absolute temperature (PTAT) configuration, or proportional to absolute temperature squared (PTAT2) configuration;

    a bias current monitor coupled to the first current source and the second current source, the bias current monitor adapted to detect a magnitude of the second current and to provide a control signal when the magnitude of the second current is equal to or greater than a predetermined magnitude; and

    a bias controller coupled to the bias current monitor, the bias controller adapted to switch the first current from the oscillator and to switch the second current to the oscillator in response to the control signal.

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