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Accurate persistent nodes

  • US 7,728,713 B2
  • Filed: 05/06/2005
  • Issued: 06/01/2010
  • Est. Priority Date: 05/06/2005
  • Status: Active Grant
First Claim
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1. A timing circuit, comprising:

  • a power capture circuit for capturing energy from a power source; and

    a counter circuit coupled to the power capture circuit, the counter circuit providing a count that represents a progression of time,wherein the power capture circuit includes a differential amplifier and a capacitance,wherein the differential amplifier compares a voltage level of the power source to a voltage level of a node formed on the capacitance;

    wherein if the voltage level of the power source is greater than a specified voltage level, the differential amplifier clamps the node to the power source.

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