Re: Transmission Gate question

Angmor wrote: 
I've been staring at a transmission gate circuit for a while trying to
figure out how it works and I'm not making any progress.  The problem
we have (yes, it's a homework problem) is to determine the on
resistance for the specific gate we've been given.  The circuit diagram
is basically just an nmos and a pmos connected in parallel.  The input
side (I know they're interchangable) is set to 5V and both of the fets
are on (5v & 0v gate for n/p, respectively).  No output voltage is
given.  I've searched for a while on google trying to find helpful
information, but all I can find is that the input signal is supposed to
pass through to Vout so that Vout is almost equal to Vin.

My question is... How can I determine the output voltage?   I can't
determine the transistor mode or currents without the output voltage,
and if I can't do that I cannot determine the on resistance.  I am not
asking for an answer to my problem, I would just like a nudge in the
right direction if possible.  This problem is driving me crazy.


  What happens to the bulk when you "turn the transistor on"?

  What circuit node is the output terminated to, and through what (load)?

IOW first find what limits the output voltage can be within and go from there.


  Mark L. Fergerson

.

Relevant Pages

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    ... > I've been staring at a transmission gate circuit for a while trying to> figure out how it works and I'm not making any progress. ... I've searched for a while on google trying to find helpful> information, but all I can find is that the input signal is supposed to> pass through to Vout so that Vout is almost equal to Vin. ... I can't> determine the transistor mode or currents without the output voltage,> and if I can't do that I cannot determine the on resistance. ...
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