Self-calibrating RC oscillator

Details Self-calibrating RC oscillator Self-calibrating RC oscillator

1995-06-07

1997-01-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331111, 331143, 331177R, H03B 520, H03K 30231, H03L 702

Patent

active

055943888

ABSTRACT:
An RC oscillator includes an RC network 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: 3928812 (1975-12-01), Bates
patent: 4520327 (1985-05-01), Myers
patent: 4714901 (1987-12-01), Jain et al.
patent: 4998075 (1991-03-01), Patton, III et al.
patent: 5017919 (1991-05-01), Hull et al.
patent: 5070311 (1991-12-01), Nicolai
S. M. Sze, "Physica of Semiconductor Devices", .COPYRGT.1969, FIG. 20. John Wiley & Sons, New York.

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