Circuit for detecting the absence of an external component

Details Circuit for detecting the absence of an external component Circuit for detecting the absence of an external component

1995-06-07

1996-12-31

Grimm, Siegfried H.

Oscillators

With frequency calibration or testing

331 65, 331111, 331143, 324548, 324549, G01R 2714, G01R 2726, H03K 30231, H03B 520

Patent

active

055898025

ABSTRACT:
A component detector circuit operates to detect the presence or absence of a circuit component, such as an external component. A resistor detecting circuit includes a biasing circuit connected to the resistor. The biasing circuit generating a bias current. The resistor detecting circuit also includes a bias current threshold detector connected to the biasing circuit and a circuit connected to the bias current threshold detector which generates a signal indicative that the bias current is lower than threshold. A capacitor detecting circuit includes a circuit connected to a resistor and configured to be connected to a capacitor which establishes a time constant proportional to an RC product of the resistor and capacitor. The capacitor detecting circuit also includes a circuit which determines whether the time constant is within a range of appropriate time constants and a circuit which generates a signal indicative that the time constant is outside the range of appropriate time constants, which indicates that the capacitor is disconnected.

REFERENCES:
patent: 4998075 (1991-03-01), Patton, III et al.
patent: 5017919 (1991-05-01), Hull et al.
patent: 5175859 (1992-12-01), Miller et al.
S. M. Sze, "Physics of Semiconductor Devices", .COPYRGT.1969, Fig. 20. John Wiley & Sons, New York.

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