Relaxation oscillator with low phase noise

Details Relaxation oscillator with low phase noise Relaxation oscillator with low phase noise

1998-12-08

2000-05-09

Mis, David

Oscillators

Relaxation oscillators

331 34, 331177R, H03B 524

Patent

active

060609575

ABSTRACT:
A relaxation oscillator includes a first capacitor at the terminals of which there is a first voltage V.sub.1, a circuit to charge the first capacitor from a power supply voltage, a circuit to discharge the first capacitor, and a switch which alternately charges and discharges the first capacitor responsive to a control signal. The relaxation oscillator also includes a relaxation circuit to generate the oscillation signal and the control signal from the first voltage. The oscillator also includes a regulation circuit to cause the first voltage applied to the relaxation circuit to be approximately equal to a reference voltage. The circuit for charging the first capacitor includes a resistance R.sub.1. The relaxation oscillator is particularly applicable to phase locked loops.

REFERENCES:
patent: 3430161 (1969-02-01), Klein
patent: 4292604 (1981-09-01), Embree et al.
patent: 5418501 (1995-05-01), Schoofs et al.
patent: 5508664 (1996-04-01), Rizzo
J. Sneep et al., "Design of a Low-Noise 100-MHz Balanced Schmitt-Trigger Oscillator," ESSCIRC , 1989, Vienna, Austria, pp. 284-287.

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