Switched capacitor oscillator formed by a damped resonator with

Details Switched capacitor oscillator formed by a damped resonator with Switched capacitor oscillator formed by a damped resonator with

1983-03-11

1985-01-08

Grimm, Siegfried H.

Oscillators

Phase shift type

331143, 331177R, 331183, 332 30R, 332 31R, 332 52, H03B 506, H03C 100, H03C 300

Patent

active

044929358

ABSTRACT:
A switched capacitor oscillator is constructed by providing a damped resonator network with a comparator as a nonlinear feedback element by connecting the input of the comparator to the output of a first operational amplifier of the resonator network and connecting the output of the comparator to the input of the resonator network. The comparator thus becomes a saturable positive feedback element for the resonator network. Also disclosed is a startup network for the oscillator and an input network which derives an input from a reference voltage in order to eliminate supply voltage noise and provide precision control of amplitude.

REFERENCES:
patent: 3374445 (1968-03-01), Gaunt
patent: 4295105 (1981-10-01), Bingham
patent: 4315227 (1982-02-01), Fleischer et al.
Mikhael, et al., "Switched Capacitor Oscillators With Linear Frequency Control", 1981, IEEE International Symposium on Circuits and Systems, Apr. 27-29 1981, pp. 188-191.

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