Temperature compensated clock

Details Temperature compensated clock Temperature compensated clock

1996-03-05

1997-07-01

Mis, David

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331158, 327160, 368156, 368201, 368202, H03L 102, H03L 700, G04B 1720

Patent

active

056442718

ABSTRACT:
A temperature compensation system includes a first oscillator to generate a number of pulses which vary from a desired frequency as a function of temperature of the first oscillator. The system also includes a second oscillator to generate digital pulses at a corrective frequency which is greater than the desired frequency. A sensor provides an temperature signal for the first oscillator. A digital memory has a digital error table addressable by a signal corresponding to the temperature signal to provide a number of pulse errors corresponding to temperature error for each of the number of pulses. Each pulse error is a function of the corrective frequency and a temperature versus frequency characteristic of the first oscillator. An accumulator receives each pulse error to generate a cumulative error corresponding to one of the number of pulses. A variable delay device counts a quantity of corrective pulses from second oscillator to provide a delayed output pulse in accordance with the desired frequency. The quantity of corrective pulses is a function of the cumulative error signal received from the accumulator. The converter, memory, accumulator and delay device may be part of a microcontroller.

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