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3.5 COMPUTER-AIDED CIRCUIT SIMULATION 169

which results are printed, plotted, or reported to PROBE, TMAX is the maximum time increment
between computed values, and UIC is a keyword that causes PSpice to use initial conditions
specified for inductors and capacitors in the element statements. In case of omission, TSTART
defaults to zero and TMAX to (TSTOP−TSTART)/50. If UIC is omitted, PSpice computes
initial conditions by assuming that the circuit is dc steady state prior tot=0. Let us present an
illustrative example.


EXAMPLE 3.5.1


Develop and execute a program to analyze the circuit shown in Figure E3.5.1(a), and use PROBE
for plottingvC(t).



+


+
Vs = 10 V vC (t)
i(0) = 0; vC (0) = 0

C

t = (^0) L R
(a)
10 mH 100 Ω
Initial conditions
i(t) 1 μF
Figure E3.5.1





  • vC (t); vC (0) = 0
    1 2 3
    0
    C
    L R
    (b)
    10 mH 100 Ω
    i(t); i(0) = 0 1 μF
    Voltage V vC(t)
    t, ms
    (c)
    0.2
    5
    0
    10
    15
    0.4 0.6 0.8 1.0
    Solution
    The program is as follows:
    EXAMPLE E3.5.1





  • THE CIRCUIT DIAGRAM SUITABLE FOR ANALYSIS IS GIVEN IN
    FIGURE E3.5.1(b)

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