Crystal clock generator having fifty percent duty cycle

Details Crystal clock generator having fifty percent duty cycle Crystal clock generator having fifty percent duty cycle

1988-03-24

1989-05-16

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331109, 331116FE, H03B 536

Patent

active

048313432

ABSTRACT:
A crystal oscillator circuit having an accurate duty cycle at very high frequency is provided. An oscillator stage is provided which receives regenerative feedback from an inverter to sustain oscillation. The oscillator stage provides an AC output signal having a first average DC value determined by the regenerative feedback. The AC signal is coupled to a clipping circuit which symmetrically clips the AC signal about a predetermined second average DC level at first and second predetermined voltage levels. The inverter receives the clipped signal and provides an oscillating clock signal with an accurate duty cycle in response thereto.

REFERENCES:
patent: 3725822 (1973-04-01), Eaton, Jr.
patent: 3979693 (1976-09-01), Saari
patent: 3996530 (1976-12-01), Feistel et al.
patent: 4536721 (1985-08-01), Charbonnier
patent: 4570132 (1986-02-01), Driscoll
patent: 4704587 (1987-11-01), Ouyang et al.
patent: 4710730 (1987-12-01), Doyle, III

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