Clocking circuit with back-up clock source

Details Clocking circuit with back-up clock source Clocking circuit with back-up clock source

1985-04-29

1987-05-19

Atkinson, Charles E.

Excavating

324 78E, 371 8, G06F 1120

Patent

active

046673288

ABSTRACT:
A clocking system for providing periodic clocking or timing signals for use in an electronic circuit. The system includes a primary clock source, such as a crystal oscillator, that provides periodic clocking or timing signals at a predetermined frequency, and a back-up clock source that is similarly capable of providing periodic clocking or timing signals at the same predetermined frequency. The clocking signals of the primary source are monitored by a fault detecting circuit, such as a frequency monitoring circuit, which checks if the clock signals are occurring precisely at the predetermined frequency. If the frequency monitoring cirucit detects a frequency variation, or deviation, in the primary clocking source, a back-up clocking source is enabled which provides the clocking signals to the clock output terminal.

REFERENCES:
patent: 3689778 (1972-09-01), Sharp
patent: 3694744 (1972-09-01), Kalotay
patent: 3803568 (1974-04-01), Higashide
patent: 3839673 (1974-10-01), Acker
patent: 4322580 (1982-03-01), Khan et al.
patent: 4362957 (1982-12-01), Stern
patent: 4538272 (1985-08-01), Edwards et al.

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