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is it possible to change a NOT gate into a BUFFER?

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tzviel

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Hi Guys,

I have a small nice question:

If you take a CMOS inverter (NOT gate) that is constructed from a N-MOS at the
bottom and a P-MOS at the top, and you exchage between the two transistors- will it work as a buffer?

I have attached a picture for visual understanding.

Thanks
Tzviel
 

IanP

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Unfortunately it won't work ..
To make a buffer you just cascade two NOTs: see picture below ..

Regards,
IanP
 

wwfeda

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the size of the mos can be different too. the first set of cmos can be smaller than the 2nd set. It gives better driving capability.

You can think of a Not gate as a negative buffer.
 

tzviel

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I am not sure...

If you put '1' to the gate of the N-MOS that is on the top it will open and the output will be '1'.
Same for '0' on the bottom.

Is it right or wrong?
(I can't attach a file for some reason so I rtied to draw)

--- vcc
|
|
--
-----0|
| --
---| |--------------------------- out
| -- |
------| ---- C
-- ----
| |
---- GND ----

CHANGED TO:

--- vcc
|
|
--
------|
| --
---| |----------------------- out
| -- |
------o| ----C
-- ----
| |
---- GND ----
 

Davood Amerion

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If you take a CMOS inverter (NOT gate) that is constructed from a N-MOS at the
bottom and a P-MOS at the top, and you exchage between the two transistors- will it work as a buffer?

yes but output will not be full swing.
because of Vth NMOS and PMOS. :D

Regards,
Davood.
 

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