Detection circuit and method for an oscillator

Details Detection circuit and method for an oscillator Detection circuit and method for an oscillator

2005-06-28

2005-06-28

Shingleton, Michael B. (Department: 2817)

Oscillators

Combined with particular output coupling network

C331S158000, C331S1160FE, C331S175000, C331S182000, C331S172000, C331S065000, C324S076490, C324S076490, C324S681000, C327S039000, C327S050000, C327S057000

Reexamination Certificate

active

06911873

ABSTRACT:
A method and circuit are disclosed for detecting the performance of an oscillator circuit. In particular, the circuit may detect a signal, such as the output of the oscillator circuit, failing to oscillate as desired. The second circuit may be capable of detecting whether the signal oscillates at a frequency that is less than a predetermined frequency. The second circuit may include timing circuits for determining whether the signal remains in a first logic state for at least a predetermined period of time and whether the signal remains in a second logic state for at least the predetermined period of time.

REFERENCES:
patent: 5539323 (1996-07-01), Davis, Jr.
Cho “Digitally-Controlled PLL with Pulse Width Detection Mechanism for Error Correction” IEEE International Solid State Circuits Conference 1997 Digest of Technical papers Feb. 6-8, 1997 pp 334-335 & 481.

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