Browse Prior Art Database

Method and Mechanism to Correct for Clock Drift due to Temperature Change

IP.com Disclosure Number: IPCOM000117462D
Original Publication Date: 1996-Mar-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Griefer, AD: AUTHOR [+2]

Abstract

Disclosed is a method to solve the problem of high-rate clock drift due to changes in the temperature of the clock oscillator crystal. The most obvious but expensive solution to the problem is to keep the clock at a constant temperature. This solution is not appropriate for clocks in desktop or lap top computers.

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This is the abbreviated version, containing approximately 100% of the total text.

Method and Mechanism to Correct for Clock Drift due to Temperature
Change

      Disclosed is a method to solve the problem of high-rate clock
drift due to changes in the temperature of the clock oscillator
crystal.  The most obvious but expensive solution to the problem is
to keep the clock at a constant temperature.  This solution is not
appropriate for clocks in desktop or lap top computers.

      Assume that the rate of drift of a clock with respect to
some standard reference is approximately a function of the
temperature measured near the oscillator.  A hardware solution is
proposed in which  a thermometer measuring this temperature is
connected to the voltage driving the oscillator in such a way that
the drift due to temperature  is corrected.  An alternative method is
to digitize the temperature and  correct for the drift
algorithmically on a logical clock based on the hardware clock to be
corrected.

      The method essentially involves reading the temperature, and
either correcting the oscillator by means of varying the voltage or
correcting the clock reading algorithmically as a function of the
measured temperature.