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NMOS - Drivers in CMOS inverter
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Q. Which among the below mentioned devices acts as a driver in CMOS Inverter Circuit?
- Published on 24 Sep 15
a.
PMOS
b.
NMOS
c.
Both a and b
d.
None of the above
ANSWER: NMOS
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Discussion
Satyawati
-Posted on 05 Oct 15
The term complementary indicates that both n-channel and p-channel MOSFETs are used in the same circuit.
A p-channel enhancement mode of MOSFET (M
1
) is adopted as a load for n-channel enhancement mode MOSFET (M
2
) in order to form CMOS inverter circuit.
In CMOS inverter, PMOS device behaves as a load while NMOS device behaves as a driver. Since the PMOS device acts as a load, it is also referred as an 'Active load'. Biasing of N-MOS driver takes place in such a way that it can operate in saturation or non-saturation region.
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