Oscillation-stop detection circuit, oscillation-stop...

Details Oscillation-stop detection circuit, oscillation-stop... Oscillation-stop detection circuit, oscillation-stop...

2006-12-19

2006-12-19

Mis, David (Department: 2817)

Oscillators

With particular source of power or bias voltage

Regulated

C331S173000

Reexamination Certificate

active

07151419

ABSTRACT:
An oscillation-stop detection circuit includes a switching unit that repeats turning on and off based on a cycle of an oscillation signal from an outside; a capacitor that is charged when the switching unit is turned on, and discharged when the switching unit is turned off; a first MOS transistor that flows a discharge current of the capacitor when the capacitor is discharged; a discharge cutoff unit that cuts off a discharge path for the discharge current to flow, for a predetermined time right after a power is turned on; and a detecting unit that detects a status of the oscillation signal based on a voltage of the capacitor.

REFERENCES:
patent: 2001/0020876 (2001-09-01), Tsukagoshi et al.
patent: 2000-332585 (2000-11-01), None

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