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

reachrkata
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 pullup 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
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