Electrical – Should I use NMOS or PMOS in CMOS demultiplexer circuit

circuit-designcmosintegrated-circuitmultiplexer

I am trying to design a simple 1:2 demultiplexer. I have two question here. First, is the following design right?: (simulation shows that it is working)

in_D is the input data line, in_S is the selector and out_A and out_B are the two demux outputs.

enter image description here

I am currently using NMOS. Now the second question is: "Will it be better to use PMOS?" Or even a maybe a third question: "What is the conventional way to design a CMOS demultiplexer"?

Update: (Removing inverter and changing M2 to PMOS)

This actually worked but I am not sure if it can be used iin real design. Simulation is ok.

Removing inverter and changing M2 to PMOS

Best Answer

This is a passgate or a transmission gate:

enter image description here

  • Take 2 of these

  • connect UA of both and use as input

  • The two UB will be the outputs

  • You can share one inverter between the two passgates (the input signal ST is the same for both).

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