Aim
– (a) Transient
Analysis of NMOS inverter using step input.
(b) Transient Analysis of NMOS inverter using pulse input.
(c) DC Analysis (VTC) of NMOS inverter with and without parameters.
Simulator
Used
– PSpice.
Theory – NMOS
functions as an inverter, when operated in only the
cutoff and the saturation regions, not in the linear region. When the
input voltage is low, NMOS does not conduct, there is no current and a high
voltage is received at the output. When the input voltage is increased, NMOS
begins to conduct, the voltage drop starts increasing and the output voltage
falls. Finally, when the input voltage is high enough to drive the mosfet into
saturation, there is a fixed small drop across the mosfet and the output
voltage saturates to this low value.
Digital inverter quality is often measured using the voltage
transfer curve (VTC), which is a plot of output vs. input voltage. From such a
graph, device parameters including noise tolerance, gain, and operating logic
levels can be obtained.
Ideally, the VTC appears as an inverted step function – this
would indicate precise switching between on and off –
but in real devices, a gradual transition region exists. The VTC indicates that
for low input voltage, the circuit outputs high voltage; for high input, the
output tapers off towards the low level. The slope of this transition region is
a measure of quality – steep (close to infinity) slopes yield precise
switching.
The tolerance to noise can be measured by comparing the minimum
input to the maximum output for each region of operation (on / off).
Circuit
Diagram –
Result
–
Conclusion
- (a)
Transient Analysis of NMOS inverter using step input has
been performed.
(b) Transient Analysis of NMOS inverter using pulse
input has
been performed.
(c) DC Analysis (VTC) of NMOS inverter with
and without
parameters has
been performed.
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