Self-calibrating oscillator

Details Self-calibrating oscillator Self-calibrating oscillator

2010-02-09

2011-11-22

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S143000

Reexamination Certificate

active

08063710

ABSTRACT:
A self-calibrating oscillator that increases the output frequency accuracy without using a charge pump includes an oscillation circuit, a pulse counter, a charging circuit, a reset circuit, a calibration circuit, and a timing control unit. The pulse counter counts a pulse signal having frequency f0from the oscillation circuit based on a count start signal provided from the timing control unit, while providing an output signal to the charging circuit. The charging circuit connects a constant current source and capacitor when provided with the output signal to raise the voltage at the connection node. The calibration circuit provides the oscillation circuit with a calibration value for increasing the frequency if the voltage when the output of the output signal ends is higher than a high potential reference voltage and provides a calibration value for lowering the frequency if this voltage is lower than a low potential reference voltage.

REFERENCES:
patent: 5594388 (1997-01-01), O'Shaughnessy et al.

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