Transmission Gate Logic

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elettro2021

Joined Feb 8, 2022
14
I have to implement following boolean function "A xor B xor C" by Transmission gates and our prof give us following solution
mod tr gate 2022-02-18_084657.png
I don't understead function of two nmos ( green rectangle ),can you give me an explanation?Thanks
 

dl324

Joined Mar 30, 2015
15,458
I don't understead function of two nmos ( green rectangle ),can you give me an explanation?
They perform the same function as the N channel devices in the transmission gates. Do you know how a transmission gate works?

If you drew the wires, you should take out the jog in the black wires. If you're going to use connection dots you should be consistent in their usage. You should not have wires touching or crossing text.

I assume that the MOSFETs are enhancement mode. I often don't draw the dashed line to indicate enhancement mode, but a teacher should never do that for an assignment.
 

crutschow

Joined Mar 14, 2008
31,126
With CMOS the nmos is ON when its gate is high, and OFF when its gate is low.
This is opposite with pmos where it is ON when the gate is low, and OFF when the gate is high.
 
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