PSpice Assignment - Engineering

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ES153
:

Engineering Software: PSpice Assignment

(ES153A11)

1

of
3

ES153
:

Engineering Software

PSpice Assignment

(ES153A11)

Objective

To prepare a technical report which demonstrates an understanding of the principles
involved in using PSpice ECAD techniques in the analysis/design of analogue and
digital
circuits
.


Submis
sion

(ES153A11)
:

By 12 noon on Friday week 1
5

p
lease submit a

file containing an

e
-
copy of the report
and all the files you used (netlists etc)
,

to

http://www.eng.warwick.ac.uk/assignments/

By 12
noon on Wednesday week 1
6

please

perform associated peer egrading
as usual at:
http://www.eng.warwick.ac.uk/assignments/ES153grading/
.


Reports

Your reports should be clear, concise, w
ell presented and of the order of 10
-
15 pages in
length.

Include in your e
-
submission
relevant annotated netlists,
graphical and other outputs for
this exercise
.

Where
-
ever possible multiple plots should be combined, using probe or
otherwise, to facilitate

the comparison of relevant voltages and currents, etc.

Typical contents should include:



Abstract (overview/synopsis of work and results/conclusions)



Introduction (outline of task and procedures to be applied to realise it)



Relevant theoretical considerati
ons in terms of analysis/design



Evaluation using PSPICE



Comparative evaluation of theory and PSpice results



Discussion and conclusions



References/Bibliography

NB: Use netlists to perform both the analogue and digital parts of the assignment.


Analogue



plot

the

graph of the input and output characteristics for the 2N2222 bipolar junction
transistor using the library model. Assume that the transistor is to be used in the common
emitter configuration.

The 2N2222 transistor is to be used in the amplifier circui
t shown below in Figure 1. Perform
the following:



try to plot the
DC and AC
load line
s

for the circuit.



verify whether or not the transistor is correctly biased to behave as an amplifying element
by monitoring the base, collector and emitter DC levels. Obt
ain a value for the DC current
gain. Is the circuit biased to optimise voltage swing?



plot the voltages at nodes 2, 3, 4 and 7 using one display screen (perform the simulation at
10kHz using an AC source). Is the output significantly distorted?



perform a t
ransient analysis of the circuit at 10kHz using an AC source and obtain a value
for the AC current gain.



perform a frequency sweep analysis of the circuit over the frequency range 10Hz to
10MHz. What are the lower and upper cut
-
off frequencies of the ampli
fier, the amplifier’s
bandwidth, and its gain
-
bandwidth product? How does the latter compare with the
ES153
:

Engineering Software: PSpice Assignment

(ES153A11)

2

of
3

2N2222’s gain
-
bandwidth product? Plot a graph of the amplifier’s input and output
impedances and the phase response of the amplifier.



model the transistor

using a current controlled current source. Assume that the transistor
has an internal base resistance of 2130 ohms. How do the base and collector voltages
compare with the values when the circuit was simulated at a frequency of 10kHz using
the library mod
el.



repeat the simulation of the amplifier using Analogue Behavioural Modelling.




Digital



Design a one bit adder using an appropriate combination of two input OR, AND and XOR
gates.

Remember that we are using the Evaluation version of PSpice so we are l
imited in terms of
the number of connections we can use in a circuit. It may thus be necessary for you to use
SUBCKTs for each of the gates and one for the ONEBIT unit.

Construct each of the basic gates using voltage controlled switches. This will give an
indication

of the ideal performance of the adder. Suggested parameters for the switch are as follows:

RON=1 ROFF=1MEG VON=1 VOFF=0



Verify the functionality of your added using the following PULSE inputs for A, B and
carry in, Cin, respectively and a transi
ent analysis of the form ‘.TRAN 2N 200N’:

VINA 1 0 PULSE 0 3 0 10N 10N 10N 50N

VINB 2 0 PULSE 0 3 0 10N 10N 20N 100N

VCIN 3 0 PULSE 0 3 100N 10N 10N 100N 200N

This is probably best done by including the waveforms for A, B, C
in
,

Sum, S, and carry out,
Cout
on a graph/page, for ease of comparison.


As
sessment
will typically be based on criteria such as the following (anticipated
percentage weighting as indicated)
:



Quality of summary/abstract, 5%



Layout and general presentation, 10%



Style and standard of gramm
ar, 5%



Level of technical comprehension,
15
%



Graphical presentation of data and use of diagrams, 10%



Use of relevant mathematical theory or background information,
15
%



Interpretation of observations and results, 15%



Quality of conclusions, 5%



Use of append
ices, references and bibliography, 5%



Appreciation of objectives and verbal discussion of work, 5%

ES153
:

Engineering Software: PSpice Assignment

(ES153A11)

3

of
3



Originality, 10%