Hello.

I am trying to create, for a project, a 2:1 Multiplexer using CMOS Transmission gates. This MUX requires 2 transmission gates, so 4 total transistors. I have seen some implementations use an inverter when connecting the Select bus.

I am pretty bad at electronics. Take a look at my attempt so far and please let me know what to fix. I am simply trying to make a 2:1 Mux.
I am currently getting this error in LTSpice:
Singular Matrix: Check node nc_03

Attatched is my LTSpice attempted design

 

Check out this article.

https://www.allaboutcircuits.com/te...ting-multiplexers-with-pass-transistor-logic/

Connect the Select line to the gates, for starters. Not the Body. Connect each Body to the Source. Connect a voltage source to the Select line. Break up V1 into two sources for the two inputs.

 

You can't leave MOSFET gates floating.