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The disclosed exclusive OR circuit has high impedance base inputs and a input differential of 0.8 volt.
English (United States)
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NPN PNP Exclusive OR
The disclosed exclusive OR circuit has high impedance base inputs and a
input differential of 0.8 volt.
If both inputs A and B are Up, or both Down, the output will be Down. If only
input A or B is Up, the output will be Up.
R2 and R3 are current-limiting resistors. Pulldown resistors R4 and R5
should each have relatively high resistance values compared to R1. The input
differential may be lowered to 0.2 volt by adding Schottky diodes (not shown) in
series with the cross-coupling lines.
Emitter followers T3 and T4 are non-isolated vertical PNP transistors.
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