Crystal oscillator and divider

Details Crystal oscillator and divider Crystal oscillator and divider

1978-01-31

1979-10-02

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307226R, 328 45, H03K 2136, H03K 2106, H03K 2110

Patent

active

041699947

ABSTRACT:
A frequency divider for converting a standard frequency output from a crystal controlled oscillator to a lower frequency which is compatible with digital devices operating in a decimal mode. The oscillator output pulses and the complement thereof are fed to first and second AND gates which are respectively enabled by the complement and true outputs of a control flip-flop. The outputs from these two AND gates are ORed together and applied to the clock input of a synchronous, programmable, multi-bit counter whose carry output terminal is connected to a first D-type control flip-flop, through an inverter, the state of which determines the initial values to be periodically loaded into the multi-bit counter and which also controls the setting of the second D-type control flip-flop.

REFERENCES:
patent: 3571728 (1971-03-01), Andrea
patent: 3896387 (1975-07-01), Kokodo
patent: 3976946 (1976-08-01), Schroder
patent: 4034302 (1977-07-01), May
patent: 4041403 (1977-08-01), Chiapparoli

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