The Dc circuit below shows the nominal values and tolerances of the two resistor

Question

The Dc circuit below shows the nominal values and tolerances of the two resistors. Create the P Spice file below, which performs a Monte Carlo analysis on the circuit. Save it as RANDOM, CIR. RANDOM RESISTOR TEST V 10. DC V 30v 30v 30v R1 1 2 RMODI 10 ohm R2 2 0 RMOD2 20 ohm .MODEL RMODI RES (R = 1 DEV = 40%) .MODEL RMOD2 RES (R = 1 DEV = 25%) .MC 1000 DC V(2) YMAX OUTPUT ALL .PROBE .END Simulate the circuit and generate the histogram for V(2). Record the median, minimum and maximum values of V(2)from the simulation. Calculate from the circuit the nominal value of V(2), and the minimum and maximum ("worst case") values. Show your work on the reverse side. Calculated values: v. Minimum. V. Maximum Nominal

Explanation / Answer

(a)in order for pspice to perform mc analysis the parts that have tolerances must have models we start by constructing the circuit by using Rmod parts of the resistors instead of R parts. The R mod1 has R1=1,dev =40% where R1 is the nominal value which gets multiplied with the actual values in the schematic and similarly R mod 2 has R2=1,dev=25% and dev is the device tolerance. in order to display the nominal resistance part on the actual schematic double click the part on the schematic to bring up the dialog box select and click on the line value then click on the change display button,choose value only then click ok twice. to run the mc analysis we need to set up dc sweep and mc parameters using analysis/setup,setup dc sweep setup the mcbox as analysis-montecarlo analysis type-dc output value- V2 function ymax,output all.Then click ok. Place the current marker on the resistance R2 and the differential voltage marker across R2. run the simulation select analysis/simulate (b) generate the histogram and record the median ,minimum and maximum from the simulation. (c)nominal V2=Vin *R2/(R1+R2)=15V miniimum we take maximum tolerances of R1 and R2 V2 min=14.15V similarly for maximum we take minimum tolerances of R1 and R2 V1 max=16.66V

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