Oscillatory circuit having built-in test circuit for checking os

Details Oscillatory circuit having built-in test circuit for checking os Oscillatory circuit having built-in test circuit for checking os

1998-10-22

2000-07-04

Kinkead, Arnold

Oscillators

With frequency calibration or testing

331 74, 327175, 324 7639, 324763, 324711, H03B 520

Patent

active

060844825

ABSTRACT:
A C-R oscillator generates a clock signal at a predetermined frequency determined by a capacitor and a resistor, and a test circuit is connected between the C-R oscillator and a pair of signal terminals for outputting the clock signal; when external control signals are supplied to the test circuit, the test circuit isolates the pair of signal terminals from the C-R oscillator, and checks the clock signal to see whether or not the duty factor of the clock signal falls within a target range so that an external testing apparatus easily diagnoses the C-R oscillator for not only the generation of the clock signal but also the duty factor.

REFERENCES:
patent: 5481228 (1996-01-01), Badyal
patent: 5481563 (1996-01-01), Hamre
patent: 5568819 (1996-10-01), Cooper

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