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SNIFF MODE LOW POWER OSCILLATOR (LPO) CLOCK CALIBRATION

  • US 20110066874A1
  • Filed: 09/17/2009
  • Published: 03/17/2011
  • Est. Priority Date: 09/17/2009
  • Status: Active Grant
First Claim
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1. An apparatus for clock calibration on a remote device, the apparatus comprising:

  • a first oscillator to generate a first clock signal during an active communication mode of the remote device to facilitate communications between the remote device and a host device, wherein the first oscillator is inactive during a sniff mode of the remote device;

    a second oscillator to generate a second clock signal during both the active communication and sniff modes, wherein the second oscillator consumes less power than the first oscillator; and

    a clock calibration module coupled to the first and second oscillators, the clock calibration module to;

    generate an estimated count for the first clock signal approximately at a transition from the sniff mode to the active communication mode, wherein the estimated count for the first clock signal is based on a clock ratio of a baseline count of the first clock signal relative to a baseline count of the second clock signal; and

    calculate a difference between the estimated count for the first clock signal and an actual count from the host device to determine whether to update the clock ratio.

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