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Navigation:: Home >> Electronics tutorials >> Circuits and design >> this page Electronically programmable inverter- a simple circuit enabling an invert / non-invert function to be switched using an exclusive OR gate
This electronic circuit is a particularly elegant for its simplicity. Using a single NOR gate it provides the ability to either invert or not invert a logic signal. Simply using the truth table for the exclusive OR function it can be seen that when there is a low on one input to the exclusive OR gate, the signal on the other input is passed through the circuit and not inverted. When the signal on one input is a high, then the signal on the other is inverted at the output.   Exclusive OR truth table
  As seen from the electronic circuit below, it consists of an exclusive OR gate, a pull up resistor and a switch. The control line could come from an external source such as another gate. In this case there would be no need for the pull up resistor, and the circuit would simply consist of the single gate held within the integrated circuit.
Programmable Inverter using Exclusive OR gate
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