Clock signal switching circuit

Details Clock signal switching circuit Clock signal switching circuit

1989-09-13

1992-03-24

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 328104, 328137, 328154, 328 63, 331 49, H03K 513, H03K 1700

Patent

active

050991418

ABSTRACT:
A clock signal switching circuit having input terminals to receive a first clock signal of a first frequency, a second clock signal of a second frequency, and a frequency switching signal and an output terminal to output one of the first clock signal and second clock signal, wherein the output of the clock signal switching circuit is selected to be one of the first and second clock signals by the frequency switching signal. The clock signal switching circuit includes a first switching circuit which receives the first clock signal and the frequency switching signal and which outputs the first clock signal when not received the frequency switching signal and which interrupts the first clock signal when received the frequency switching signal, with the output of the first switching circuit being switched in synchronization with the first clock signal, and a second switching circuit which receives the second clock signal and the freqnency switching signal and which outputs the second clock signal when received the frequency switching signal and which interrupts the second clock signal when not received the frequency switching signal, wherein the second switching circuit outputs the second clock signal after the first switching circuit has interrupted the first clock signal and interrupts the output of the second clock signal before the first switching circuit outputs the first clock signal, with the output of the second switching circuit being switched in synchronization with the second clock signal.

REFERENCES:
patent: 3708686 (1973-01-01), Butler, Jr. et al.
patent: 4419629 (1983-12-01), O'Brien
patent: 4748417 (1988-05-01), Spengler
patent: 4767918 (1988-08-01), Kushima et al.
patent: 4789984 (1988-12-01), Swartz
patent: 4820992 (1989-04-01), Avis
patent: 4853653 (1989-08-01), Maher
patent: 4855615 (1989-08-01), Humpleman
patent: 4988901 (1991-01-01), Kamuro et al.

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