Crystal-controlled oscillator having sinusoidal and square-wave

Details Crystal-controlled oscillator having sinusoidal and square-wave Crystal-controlled oscillator having sinusoidal and square-wave

1975-08-29

1976-09-07

Grimm, Siegfried H.

Oscillators

Single oscillator with plural output circuits

Plural outputs of diverse wave form

331108D, 331109, 331116R, 331183, H03B 536, H03K 326

Patent

active

039796930

ABSTRACT:
A precision crystal-controlled oscillator circuit with provision for separate sinusoidal and square-wave output signals which can be realized as a silicon integrated circuit without the use of external capacitors or resistors is disclosed. Two feedback loops are utilized in addition to the oscillating loop. The first feedback loop maintains the gain of the oscillation loop at substantially unity when the amplitude of the oscillation is at a predetermined level, thereby ensuring both spectral purity and amplitude stability of the sinusoidal output signal. The second feedback loop maintains the duty cycle of the square-wave output signal substantially equal to 50 percent by controlling the circuit operation to equally space the signal zero crossings at the input of the square-wave output stage.

REFERENCES:
patent: 3649850 (1972-03-01), Davis
patent: 3649929 (1972-03-01), Thompson

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