interchanging of nmos and pmos?

[abhineet22]

what happen if we interchange nmos and pmos in inverter?

 

[no_mad]

Hi,

Check this website:
http://hitequest.com/Hardware/El_hardware.htm

Enjoy

 

[aravind]

the above is not working for me
can give explaination what it has?

 

[nagula suresh]

you will get an weak high and weak low.
means u r high is vdd-vthinstead of vdd.
low is vth instead of zero.

 

[pd]

Hi
In that case u will get the inverter not working at all as for all input voltages if u look from the out put node u will see infinite impedance as both transistors will be off. Hence u will get funny behaviour due to noise pickups riding on them.analyse it properly and post agail if u r not able 2 understand it still now.
regards
pratap

 

[rogger123]

hi
the inverter acts like a weak buffer. with a reduced noise margin/ output voltage swing.
H= Vdd -Vthn
L= Vss + Vthp

Reasono for this is Body effect .. look it up in google.

hth
cheers
rogger

 

[shankarmit]

if u interchange nmos and pmos

your logic high changes from VDD to VDD-Vt
your logic low changes from VSS to VSS+vt..


See Rabey digital integrated circuits chaper 5 CMOS inverter.



Regards
Shankar

Added after 6 minutes:

Thats a cool website.. useful for many begineers in vlsi....
Thanks

Regards
Shankar