This example shows a CMOS XOR gate. The output is high whenever exactly one of the inputs is high, and low otherwise. Click on the inputs (on the left) to toggle their state.
When the first input is high, the two MOSFETs on the left act as an inverter, inverting the second input. The two MOSFETs on the right form a transmission gate which is closed when the first input is low, transmitting the second input to the output unchanged. -- Credits: Mr. Paul Falstad.
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