Digitally-tuned oscillator including a self-calibrating RC oscil

Details Digitally-tuned oscillator including a self-calibrating RC oscil Digitally-tuned oscillator including a self-calibrating RC oscil

1995-06-07

1996-09-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331111, 331143, 331177R, H03B 524, H03L 700

Patent

active

055527485

ABSTRACT:
A digitally-tuned oscillator (DTO) includes a digital-to-analog converter (DAC) and an RC oscillator. The RC oscillator includes an RC circuit for forming a time constant equal to the RC product. However, this RC time constant is not used in the manner of a typical RC network to set the frequency of oscillation. Instead, the RC oscillator disclosed herein includes a separate oscillator, such as a voltage-controlled oscillator (VCO), and uses the RC time constant to compare with the oscillator-generated period and to adjust the frequency of the overall RC oscillator circuit in accordance with the comparison. The RC oscillator is self-calibrating.

REFERENCES:
patent: 3644840 (1972-02-01), Conner
patent: 4998075 (1991-03-01), Patton, III et al.
patent: 5017919 (1991-05-01), Hull et al.
patent: 5349311 (1994-09-01), Mentzer
S. M. Sze, "Physics of Semiconductor Devices", .COPYRGT.1969, FIG. 20. John Wiley & Sons, New York.

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