Jim Thompson wrote:

On Thu, 10 Mar 2011 09:00:01 -0600, Vladimir Vassilevsky
wrote:

Here is absolutely symmetrical XOR, it is also absolutely minimal :-)

http://www.abvolt.com/misc/xor.jpg

I'm not getting across to you. Describe how that works.

If the inputs are 01 or 10, both FETs are on, so the output = 1.
If the inputs are 00 or 11, only one of FETs is on, output = 0.
Minor technicalities omitted for clarity.

Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com