Clock switcher circuit

Details Clock switcher circuit Clock switcher circuit

1994-12-27

1996-03-26

Wong, Peter S.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

327298, 327217, H03K 513

Patent

active

055024092

ABSTRACT:
A clock switcher circuit for providing at least one set of clock signals selected from a plurality of clock sources. A first clock signal having a first pulse length and a second clock signal having a second pulse length are circuit inputs. Another circuit input is a clock selection input. When the clock selection input indicates a new output clock signal, different from the then current output clock signal, should be output by the circuit, the circuit provides a means for switching to output the new output clock signal. In switching to output the new output clock signal, the circuit prevents the occurrence of the output clock signal ever having a pulse shorter than the normal pulse length of the then current output clock signal, whether the then current output clock signal is the first clock signal or the second clock signal.

REFERENCES:
patent: 4229699 (1980-10-01), Frissell
patent: 4855616 (1989-08-01), Wang et al.
patent: 4970405 (1990-11-01), Hagiwara
patent: 4979194 (1990-12-01), Kawano
patent: 5099140 (1992-03-01), Mudgett
IBM Technical Disclosure Bulletin, vol. 32, No. 9B, Feb. 1990, pp. 82-84.

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