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4:1 MUX using TGs: how it works

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user4592357

Joined Nov 13, 2016
20
I'm trying to understand how 4:1 MUX using TGs works.
This is the example which I'm looking at https://1.bp.blogspot.com/-ebH97RsmyiM/U41lLTObA5I/AAAAAAAAAQ4/EV-bIGu5waI/s1600/mux_1.JPG (first image)
I've understood how 2:1 MUX works but I don't get how 4:1 works. For input1, I understand: for (0,0) both pmos-es get 0 and both nmos-es get 1, so they're both open => the out is input1. But I don't get for other combinations - (0,1), (1,0), (1,1). For (0,1) I get that 1st TG is open and the 2nd TG is closed. Then how the input is going to out? Can someone explain? Thanks in advance
 
U

Thread Starter

user4592357

Joined Nov 13, 2016
20
Thanks, I already figured this out by myself, I was always giving (0,0) and that's why I got wrong results for the other combinations
 
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