Highly accurate temperature stable clock based on...

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2011-07-19

2011-07-19

Chang, Joseph (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S066000, C331S002000

Reexamination Certificate

active

07982550

ABSTRACT:
An apparatus and a method for compensating for a mismatch in temperature coefficients of two oscillator frequencies to match a desired frequency ratio between the two oscillator frequencies over a temperature range. In one embodiment of a temperature sensor, first and second oscillators of different temperature characteristics are coupled to a differential frequency discriminator (DFD) circuit. The DFD circuit compensates for the different characteristics in order to match a frequency difference between the first and second frequencies over a temperature range.

REFERENCES:
patent: 6831525 (2004-12-01), Beaudin et al.
patent: 7211926 (2007-05-01), Quevy et al.
patent: 7212075 (2007-05-01), Young et al.
patent: 7760036 (2010-07-01), Sutardja
Rafael J. Betancourt Zamora et al. “A 1.5mW, 200MHz CMOS VCO for Wireless Biotelemetry”, Center for Integrated Systems, Dept of Electrical Engineering, Stanford University, Stanford, California, pp. 1-14.

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