Question 13.9: FINDING THE TRANSIENT RESPONSE OF AN INTEGRATING CIRCUIT WIT...

FINDING THE TRANSIENT RESPONSE OF AN INTEGRATING CIRCUIT WITH A HYSTERESIS LOOP 

The input signal to the integrating circuit of Figure 13.33(a) is v_{in} = 2 sin(120πt). The plot of current i against V_{in}/H is shown in Figure 13.33(b). Use PSpice to calculate the transient response for a duration of 0 to 33.33 msec in steps of 10 μsec, and to plot the output voltage V_{o} against the input voltage V_{in}.

13.33(a)
13.33(b)
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The input frequency is f = 60 Hz. The PSpice schematic is shown in Figure 13.34 for an integrating circuit with a hysteresis loop.

The listing of the circuit file is as follows:

Example 13.9 Hysteresis loop

SOURCE     VIN 1 0 SIN (0 2V 60HZ)
CIRCUIT      .PARAM H = 2                                         ; Hysteresis

RL 3 0 1G
RI 1 0 1G
GTAB 0 4 TABLE {V(1)/(H/2)} =            ; Table for ratio Vin/(H/2)
+ (−2 −1K) (−1, 0) (1, 0) (2 1K)
C 4 0 1 IC=0V
R 4 0 1G
EOUT 3 0 4 0 1

ANALYSIS   .TRAN 0.1MS 16.67MS UIC                     ; Use initial condition in

transient analysis
.PLOT TRAN V(3) V(1)                              ; Prints on the output file
.OPTIONS ABSTOL = 1.00N RELTOL = 0.01 VNTOL = 0.1 ITL5 = 0
.PROBE                                                      ; Graphics post-processor

       .END

The plot of the output voltage V(3) against the input voltage V(1) is shown in Figure
13.35. The output remains constant during the hysteresis band.

13.34
13.35

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