Crystal oscillator and back-up circuit with overspeed and unders

Details Crystal oscillator and back-up circuit with overspeed and unders Crystal oscillator and back-up circuit with overspeed and unders

1995-08-18

1997-03-11

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

327292, H03B 100

Patent

active

056105614

ABSTRACT:
A fail-safe clock generator which has particular utility in implantable cardiac defibrillators includes a crystal oscillator for generating a crystal clock signal, a back-up circuit, and a one-shot generator. The back-up circuit includes a low frequency oscillator for generating a low frequency clock signal having a frequency less than that of the crystal clock signal, and an overspeed/underspeed detector responsive to the low frequency clock signal for detecting the frequency of the crystal clock signal during each period of the low frequency clock signal, and for generating a back-up mode control signal in response to detection of either an overspeed or underspeed failure mode over a plurality of consecutive periods of the low frequency clock signal. The one-shot generator is responsive to the crystal clock signal, during a normal mode of operation, for generating an output clock signal, and is responsive to the back-up mode control signal, during a back-up mode of operation, for generating the output clock signal, e.g., in a self-clocking mode of operation.

REFERENCES:
patent: 4485818 (1984-12-01), Leckrone et al.
patent: 4667328 (1987-05-01), Imran
patent: 4816776 (1989-03-01), Kessler

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