Apparatus and method for generating clock pulses having a stable

Details Apparatus and method for generating clock pulses having a stable Apparatus and method for generating clock pulses having a stable

1992-03-11

1993-04-13

Grimm, Siegfried H.

Oscillators

Combined with particular output coupling network

307261, 307265, 328 28, 328111, 331158, 331186, H03B 532

Patent

active

052026477

ABSTRACT:
An apparatus for generating clock pulses comprises a Colpitts-type quartz crystal oscillator having an inverter composed of a C-MOS integrated circuit, and a quartz-crystal resonator connected with said inverter, and an amplifying circuit for amplifying the output of said quartz-crystal oscillator and delivering clock pulses as output. A first resistor is provided between the input terminal of the inverter and the quartz-crystal resonator, and the input terminal of the inverter is connected with the input terminal of the amplifying circuit. The amplifying circuit is for connection with a load composed of TTL circuits. This amplifying circuit includes a capacitor for suppressing a direct-current bias voltage from the output of the oscillator, an inverter composed of a C-MOS integrated circuit for providing the clock pulses as output, and a negative feedback circuit which utilizes negative feedback to the inverter as a direct-current bias voltage corresponding to the duty ratio of the clock pulses. This apparatus may further comprise a power supply for supplying operation voltage to the amplifying circuit which matches that of the load.

REFERENCES:
patent: 3699476 (1972-10-01), Mancini
patent: 4060772 (1977-11-01), Yamada et al.
patent: 4383224 (1983-05-01), Saari
patent: 4871982 (1989-10-01), Williams et al.
patent: 4999588 (1991-03-01), Koch

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