Self-calibrating oscillator

Details Self-calibrating oscillator Self-calibrating oscillator

2010-03-31

2011-12-13

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S143000, C331S135000, C331S173000, C331S185000, C327S072000, C327S073000, C327S143000

Reexamination Certificate

active

08076981

ABSTRACT:
An oscillator that increases the accuracy of an output frequency, without using a charge pump, has an oscillation circuit, first and second voltage supply circuits, and a calibration value generation circuit. The first voltage supply circuit includes a resistor and a capacitor, the resistance and capacitance of which are determined so that a first voltage reaches a reference voltage within a reference time. The second voltage supply circuit includes first and second switching means, which perform switching when receiving pulse signals corresponding to the frequency of the oscillation circuit to raise the second voltage. A calibration value generation circuit provides the oscillation circuit with a calibration value that lowers the frequency when the second voltage reaches the reference voltage before the first voltage and raises the frequency when the second voltage reaches the reference voltage after the first voltage.

REFERENCES:
patent: 5594388 (1997-01-01), O'Shaughnessy
patent: 6114920 (2000-09-01), Moon
patent: 7009429 (2006-03-01), Eberlein
patent: 7126433 (2006-10-01), Godambe
patent: 7372342 (2008-05-01), Berens
patent: 2004/0133912 (2004-07-01), Thomas

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