when p and n are interchanged?
1.P -strong '1', weak '0' reason -not complete discharge of output capacitance load thereby weak '0'.(derived from vdd equations)
n - stron '0' , weak '1' reason - not complete charging of output capacitance load thereby weak '1'.
so when the positions are interchanged :
1.static loss increased : the inverter does not give a '0' output even if input is not driven,bcoz of conducting path between vdd and ground rails.Hence static losses even if 'off' condition.
2.noise margin decreases.
Added after 1 hours 23 minutes:
for source and drain interchange?
1. source should be biased at a fix voltage or ground to avoid body effect.which is variation of Vt(threshold) with V(source).thereby leading to loss of performance of nmos and pmos respectively.
2. from the inverter characteristics: the operation starts with pmos in linear region and nmos cut off.
|Vds|>Vgs-Vt and Vgs<Vt
both these equations are not satisfied.likewise the other operation points of inverter will be not satistied.
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