Circuit for limiting maximum frequency output of a voltage contr

Details Circuit for limiting maximum frequency output of a voltage contr Circuit for limiting maximum frequency output of a voltage contr

1991-09-23

1993-05-04

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 17, 331 25, H03L 7085

Patent

active

052085554

ABSTRACT:
A circuit is which, when used in a voltage controlled oscillator (VCO) circuit, detects a frequency on the output of the VCO and, if this output frequency is above a certain value, the circuit forces the output frequency of the VCO to decrease until it is below the certain value. This acts to keep the output frequency of the VCO below a selected frequency which can be accurately processed by the feedback circuits driven by the VCO. Once the output frequency of the VCO is below the certain value, the circuit stops forcing the output frequency to decrease, and the circuit becomes transparent. At this point, the conventional feedback circuitry driving the VCO takes over the adjustment of the VCO output frequency.

REFERENCES:
patent: 4523157 (1985-06-01), Sato

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