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CHAP. 15]

CIRCUIT ANALYSIS USING SPICE AND PSPICE

385

Fig. 15-25

The source file is DC analysis, V1 V2 R1 R2 R3 R4 R5 .DC .PRINT .END

Fig. 15-25 2 0 0 4 0 1 1 2 1 3 3 0 3 4 V1 25 DC I(R1)

DC DC 2 5 10 4 2 25 I(R3)

25 50

1 I(R5)

The output file includes the following results: DC TRANSFER CURVES V1 I(R1) 2:500E þ 01 1:306E þ 00

I(R3) 3:172E þ 00

I(R5) 1:045E þ 01

The analytical solution requires solving three simultaneous equations.

15.4

Using PSpice, find the value of Vs in Fig. 15-4 such that the voltage source does not supply any power. We sweep Vs from 1 to 10 V. The source and output files are DC sweep in the circuit of Fig. 15-4 R1 0 1 500 R2 1 2 3k R3 2 3 1k R4 0 3 1.5 k Vs 3 1 DC 4V Is 0 2 DC 3 mA .DC Vs 1 10 1 .PRINT DC I(Vs) .PROBE .PLOT DC I(Vs) .END The output file contains the following results: DC TRANSFER CURVES Vs I(Vs) 1:000E þ 00 7:500E  04 2:000E þ 00 2:188E  12 3:000E þ 00 7:500E  04

Mahmood_Nahvi_eBook_Schaum_s_Outlines_Theory_An