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

  • US 7,545,227 B2
  • Filed: 10/28/2007
  • Issued: 06/09/2009
  • Est. Priority Date: 03/22/2004
  • Status: Expired due to Fees
First Claim
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1. A start-up apparatus for a free-running harmonic oscillator, the apparatus comprising:

  • a first current source to provide a first current;

    a second current source to provide a second current, the second current proportional to temperature;

    a bias current monitor coupled to the first current source and the second current source, the bias current monitor 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 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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