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On 11-03-10 08:00 AM, Vladimir Vassilevsky wrote:


Jim Thompson wrote:



Oh! How Larkinesque :-)

Could you put some values (and device dimensions) on that sketch ?:-)

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

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


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


So, how do the mosfets know there is only one input on? How do the
mosfets turn off when there are two inputs? Most mosfets are pretty
sensitive to the slightest gate voltage, so even one input would
probably turn both on at full blast. What you have there is an OR gate

What limits the base current on the output pnp transistor?

Also, shouldn't there be drain resistors to ground on those gates? I had
a mosfet turn on once by just static from my hand touching the
unresistored gate. I then put a 100k ohm drain resistor on it and the
problem went away.


mike (the REAL one)




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