NMOS Crystal oscillator

Details NMOS Crystal oscillator NMOS Crystal oscillator

1981-01-21

1983-05-10

Grimm, Siegfried H.

Oscillators

Combined with particular output coupling network

307261, 307268, 331116FE, H03B 536, H03K 1200

Patent

active

043832245

ABSTRACT:
In an NMOS integrated circuit (10), a basic Pierce-type oscillator stage (16) which includes an inverter stage with a quartz crystal resonator (34) is coupled to a transistor-transistor logic output stage (22) through a comparator (18) and a level shifter (20) to achieve a circuit having the combination of a relatively high tolerance to parasitic capacitances and resistances and a well-controlled output duty cycle of nearly 50 percent.

REFERENCES:
patent: 3959744 (1976-05-01), O'Connor
patent: 3978424 (1976-08-01), Hobo et al.
Frerking, Crystal Oscillator Design and Temperature Compensation, Van Nostrand Reinhold Co., 1978, pp. 56-59.

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