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# Ternary Threshold Circuit

IP.com Disclosure Number: IPCOM000074414D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 28K

IBM

## Related People

Lupic, AG: AUTHOR

## Abstract

The input signal of this threshold circuit is the result of the sum of the signals of the three inputs X1, X2, and X3. The threshold is formed by two zener diodes D1 and D2 which are linked in series and are backward biased. If the input signal is between the positive and the negative threshold, the two diodes D1 and D2 and transistors T1 and T2 controlled via these diodes, are nonconductive. Output signal Y then assumes the value derived from +/- V and resistors R1 to R4.

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Ternary Threshold Circuit

The input signal of this threshold circuit is the result of the sum of the signals of the three inputs X1, X2, and X3. The threshold is formed by two zener diodes D1 and D2 which are linked in series and are backward biased. If the input signal is between the positive and the negative threshold, the two diodes D1 and D2 and transistors T1 and T2 controlled via these diodes, are nonconductive.

Output signal Y then assumes the value derived from +/- V and resistors R1 to R4.

If the input signal reaches the negative threshold, diode D1 breaks down, causing transistor T1 to be made conducive. Subsequently, output signal Y assumes a positive value. After the positive threshold has been reached, transistor T2 is made conductive via diode D2, so that output signal Y is negative. The threshold circuit simultaneously represents an inverter.

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