Oscillation detection circuit

Details Oscillation detection circuit Oscillation detection circuit

2005-09-13

2005-09-13

Kinkead, Arnold (Department: 2817)

Oscillators

Combined with particular output coupling network

C331S00100A, C327S292000

Reexamination Certificate

active

06943634

ABSTRACT:
An oscillation detection circuit is constituted by at least one circuitry comprising a first current source for charging a capacitor and a second current source for discharging the capacitor, which are connected in series via a switch controlled to be opened or closed in response to an output signal of an oscillation circuit, wherein the first current source is greater than the second current source in current value. Herein, a signal emerging at a connection point of the first and second current sources is integrated as the switch is repeatedly turned on and off in response to the oscillation signal whose level is periodically changed in an oscillation mode. A Schmitt trigger is arranged to produce a detection signal based on the signal at the connection point between the first and second current sources.

REFERENCES:
patent: 6343334 (2002-01-01), Uemura et al.
patent: 10-190413 (1998-07-01), None
patent: 11-220330 (1999-08-01), None
patent: 2000-122749 (2000-04-01), None
patent: 2001-326565 (2001-11-01), None
patent: 2002-043906 (2002-02-01), None

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