This is why you'll find various transistor counts. Oh and don't forget another inverter at the output. Add as many if you want to isolate the outputs with inverters. For example, pass-transistor logic ( transmission gates) makes it pretty simple :Įach pass element is a pair of complementary transistors, so this gate uses 2 NMOS and 2 PMOS. You can find circuits using 4, 6, 8, 9, 10 or 12 transistors, again with varied strengths for the inputs and the output. The XOR gate has a much wider range of implementations in MOS and CMOS. Does the gain in parts count affect the performance ? Apparently, it's pretty close to ideal because it's touted as a solution in Direct Coupled Transistor Transistor Logic:Īnother version has only one transistor but 4 diodes :Īnother question is : can this scheme (no amplification, just relying on the input's strength) be extended to other logic or sequential functions ? XOR is pretty important in CPUs because many mechanisms rely on it, for example ALUs. Thus, the question : is it the best method ? What about the switching speed or the capacitances ? These two interlocked transistors use a very unusual structure, which requires the least theoretical number of switching elements, but it depends on a trick : the input impedances matter a lot and the circuit depends on a "hard" 0 level, because the circuit behaves almost like a "pass" element. ![]() And when there is low light intensity, its resistance will increase, and it will behave as an open circuit.I sometimes find a small circuit with 3 resistors and 2 transistors that performs the eXclusive OR operation. When there is more light intensity, its resistance is low and acts as a close circuit. It’s a resistor that changes its resistance based on light falls on it. We will use an LDR known as Light Dependent Resistor. “ Stop the light bulb to be turning on in Day time using AND logic“ And the same switch should turn ON and OFF the light bulb when there is low light intensity (nighttime). If the light intensity is more, it means its day time therefore, the switch should not work because we don’t need light. The output pin of IC drives the small bulb. The application of the circuit will be to monitor the light intensity, and there will be one switch. In this example, we will build a simple circuit based on 74HC08. We have come up with a similar real-life application based on AND gate.
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