Highly stable integrated time reference

Details Highly stable integrated time reference Highly stable integrated time reference

2006-05-16

2006-05-16

Choe, Henry (Department: 2817)

Oscillators

Phase shift type

C331S03600C

Reexamination Certificate

active

07046097

ABSTRACT:
An integrated oscillator that may be used as a time clock includes circuitry that oscillates about an RC time constant, which RC time constant is adjustable to provide a desired frequency of oscillation. More specifically, the oscillator includes a capacitor array that has a plurality of capacitors coupled in parallel wherein each capacitor may be selectively included into the RC time constant or selectively excluded there from. Rather than setting the capacitance values to a desired capacitance value, a system for adjusting the time constant includes circuitry for measuring an output frequency and for comparing that to a certified frequency source wherein the time constant is adjusted by adding or removing capacitors from the capacitor array until the frequency of the internal clock matches an expected frequency.

REFERENCES:
patent: 4200863 (1980-04-01), Hodges et al.
patent: 5180991 (1993-01-01), Takashima
patent: 5581252 (1996-12-01), Thomas
patent: 5675340 (1997-10-01), Hester et al.
patent: 6639479 (2003-10-01), Kappes et al.

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