EECE-21(B)
Course Code : EECE-106
Steady-State AC analysis and Frequency response.
Name
: Taki Imdadullah Nur
Roll
: 202316069
Level/Term
: L-1,T-2
Course
: Electrical Circuits and Simulation Laboratory 2
Date of Submission : 08 .01 .2024
Name of the EXP:
Steady-State AC analysis and Frequency response.
Objective:
 Using PSpice to solve steady-state phasor problems.
 Observing the frequency response characteristics of different types of analog
filters.
Theory:
In PSpice's Steady-State AC analysis, we simulate circuits with sinusoidal
excitation at specific frequencies, exploring behavior without physical prototyping.
AC sources, like DC sources, use cosine waveforms with defined phase angles.
The ".AC" command sets frequency ranges, crucial for phasor analysis. ".PRINT
AC" reports phasor values for result interpretation. Engineers use these commands
in examples to grasp voltage, current magnitudes, and phase angles at specific
frequencies, gaining insight into circuit performance.
Frequency sweeps in this analysis study circuit responses with different sweep
types (LIN, OCT, DEC). Engineers analyze filters, cutoff frequencies, cascade
filter types, and predict circuit behavior under varied frequency conditions. Pre-lab
exercises involve drawing phasor diagrams, deriving expressions, and calculating
parameters for a deeper understanding and prediction of circuit responses to
different frequencies.
Practice Problem 1:
Netlist:
EXP 8 FIG 3 net
v2 1 0 ac 1 0
cf 1 2 100u
rf 2 0 1.59
.ac dec 50 1 10k
.probe
.end
Graph of volt vs freq across rf:
1.0V
(1.0000K,706.762m)
0.5V
0V
1.0Hz
V(2)
3.0Hz
10Hz
30Hz
100Hz
300Hz
1.0KHz
Frequency
From the graph, the cutoff frequency is 1k hz of this high pass filter.
3.0KHz
10KHz