Oscillation circuit and PLL circuit using same

Details Oscillation circuit and PLL circuit using same Oscillation circuit and PLL circuit using same

1997-02-24

1999-02-09

Dinh, Son T.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331111, 331143, H03L 700

Patent

active

058700005

ABSTRACT:
An oscillation circuit for producing an output whose frequency accords with an input voltage value, comprises a first constant current source whose current has a value according to the input voltage value; a charge capacitor to be charged by the first constant current source; a comparator having one input terminal connected to a charge terminal of the charge capacitor to be charged and an other input terminal supplied with a first reference voltage, for comparing inputs to both input terminals with each other and outputting an output signal having a high level or a low level; and first switch means for pulling down a potential of the charge terminal of the charge capacitor to a second reference voltage lower than the first reference voltage under control by an output of the comparator.

REFERENCES:
patent: 4742315 (1988-05-01), Schreilechner
patent: 5592120 (1997-01-01), Palmer et al.
patent: 5668508 (1997-09-01), Pulvirenti et al.

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