Circuit arrangement for evaluating signals, particularly output

Details Circuit arrangement for evaluating signals, particularly output Circuit arrangement for evaluating signals, particularly output

1976-03-04

1978-02-21

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

250221, 307311, H03K 342

Patent

active

040755070

ABSTRACT:
The circuit arrangement includes a measuring device having an output circuit connected to one input of a comparator, and including a voltage divider whose tap is connected to the other input of the comparator. A storage capacitor is connected to the tap of the voltage divider and to such other input of the comparator and provides a reference voltage bearing a fixed relation to, but always lower than, the signal voltage of the measuring device in the quiescent state of the arrangement. A bias voltage may be applied to the tap of the voltage divider. When the measuring device responds to a test object, the voltages at the comparator inputs are so switched that the reference voltage is held above the signal voltage until the measuring device returns to the quiescent state. In the quiescent state, the signal voltage exceeds the reference voltage and the comparator, changing back to the zero state, restores the initial condition of the two voltages. A switching arrangement is provided which, when the reference voltage falls below a predetermined minimum value, and if the arrangement has not switched to the operating state, provides a corresponding logic signal.

REFERENCES:
patent: 3189745 (1965-06-01), van Reymersdal
patent: 3569739 (1971-03-01), Stolman
patent: 3676685 (1972-07-01), Myer
patent: 3804979 (1974-04-01), Knowles
patent: 3863066 (1975-01-01), Liedholz

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