Problem 4.8 - DC Node Voltage Analysis and Network Simplification
*
* The circuit for this problem is from textbook Chap. 4, Problem 22.
*
* Enter the circuit as given, solve for the node voltages, and print
* out values for the currents i1 and i2 shown on the circuit diagram.
* Add a zero-volt source between nodes 6 and 7 for current sensing.
*
* REWRITE the PSpice program as Part 2 (below the original program),
* using the resistance and source modifications described below:
* ===> Convert the series string of resistances R13, R34, and R40 into
* one equivalent resistance. Determine the relationship between
* V(3,4) and V(1) by applying the voltage division rule. Calculate
* a new gain expression in terms of V(1) for the VCVS. Substitute
* a single resistance for the three parallel resistances at node 6.
* Using the current division rule, calculate a new gain expression
* in terms of current source IS1 (instead of current i2) for the CCVS.
* Obtain a listing of the circuit node voltages and compare with the
* results of the original program run.
*
* Explore the effect of resistance R89 on the node voltages by
* using different values for R89 as a "PSpice experiment."
*
* PRESS "INSERT" KEY ONCE TO GO INTO "OVERSTRIKE" MODE
* IF USING THE CONTROL SHELL EDITOR. IT SAVES "DELETES."
*
.OPT nopage
V1 1 0 DC 120
IS1 ??? ??? DC 12 ; Enter correct initial and final nodes.
V2 9 0 DC 80
E1 8 5 3 4 ??? ; Enter VCVS gain.
VSN ??? ??? DC 0 ; Current-measuring voltage source added
; to measure i2. Enter the node numbers
; with the correct polarity.
H1 8 9 VSN ??? ; Enter CCVS gain.
R13 1 3 30
R34 3 4 20
R40 4 0 10
R15 1 5 13
R6A 6 0 2
R6B 6 0 3
R70 7 0 6
R80 8 0 11
R89 8 9 ??? ; Select different values for "experiment"
; to observe effect of resistance on the
; circuit node voltages.
.DC V1 120 120 1
.OP
.PRINT DC I(R15) I(R70)
.END
*Problem 4.8, Part 2. DC Node Voltages and Network Simplification
*
* Copy the program above using equivalent resistance
* values and new VCVS and CCVS device statements.
* Re-run the program to verify your calculations.
*