qaisarpk1
qaisarpk1
Branch Unspecified
03 Nov 2008

CMOS inverter

NMOS PASSES LOGIC '0' STRONGLY BUT WEAK LOGIC '1'
PMOS PASSES LOGIC '1' STRONGLY BUT WEAK LOGIC '0'.?
what is the reason???
reachrkata

reachrkata

Branch Unspecified
03 Nov 2008
[​IMG]

NMOS logic uses a MOSFET connected to GND (Logic 0). When the MOSFET is activated it acts almost like a short thereby bringing the signal to GND (logic 0) very well. On the other hand, for Logic 1 output the MOSFET is turned off, whereby the strength depends on how strong or weak the pull-up is.

The viceversa applies for PMOS.

Thats the reason why CMOS can give both a strong 1 and a strong 0, because it has both the MOSFETs.

-Karthik

Share this content on your social channels -

Only logged in users can reply.