Voltage controlled oscillator circuit employing integrated circu

Details Voltage controlled oscillator circuit employing integrated circu Voltage controlled oscillator circuit employing integrated circu

1993-12-08

1995-01-24

Grimm, Siegfried H.

Oscillators

Relaxation oscillators

With sync, trigger or pulsing circuit

331173, 331177R, H03K 303

Patent

active

053845544

ABSTRACT:
An integrated voltage controlled oscillator (VCO) circuit which utilizes the relative capacitance ratio between capacitors and the relative resistance ratio between resistors in an integrated circuit (IC) to output a signal having a predictable frequency for a given control signal voltage. The VCO output frequency will not vary more than 3.0% from one IC chip implementing the VCO circuit, to the next. This low variance between IC chips is derived from the phenomenon whereby the respective ratios of capacitance and resistance between capacitors and resistors in the IC will not vary more than .+-.1.5% from the ratios of like capacitors and resistors on other IC chips. The integrated VCO circuit includes a control signal subcircuit, integrator subcircuit, filter subcircuit, and comparator unit subcircuit.

REFERENCES:
patent: 3708762 (1973-01-01), Nilsson
patent: 3914712 (1975-10-01), Currie
patent: 4006430 (1977-02-01), Meyer-Ebrecht
patent: 4794350 (1988-12-01), Meyer-Ebrecht
patent: 5136262 (1992-08-01), Spencer

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