Clock frequency detection circuit

Details Clock frequency detection circuit Clock frequency detection circuit

1984-08-06

1987-06-09

Miller, S. D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328120, 328140, 307228, 307522, 307234, H03K 906, H03K 500

Patent

active

046723250

ABSTRACT:
A clock detector has a D flip-flop having a D terminal, a reset terminal and a clock terminal, a first saw-tooth wave signal generator having a first time constant for supplying to the D terminal a first logic signal resulting from a first saw-tooth wave signal, and a second saw-tooth wave signal generator having a second time constant which is larger than the first time constant for supplying to the reset terminal a second logic signal resulting from a second saw-tooth wave signal. A first clock pulse is supplied to the first and second saw-tooth wave signal generators, and a second clock pulse is applied to the clock terminal of the D flip-flop. When a reciprocal of a frequency of the first and second clock pulses falls within the first and second time constants, a normal clock pulse is detected.

REFERENCES:
patent: 3864583 (1975-02-01), Fiorino
patent: 4322642 (1982-03-01), Sugasawa
patent: 4353091 (1982-10-01), Hoppe

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