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. (a) Create the PSpice file below, which performs a Monte Carlo analysis on the circuit. Save it as RANDOM.CIR. (b) Simulate the circuit and generate the histogram for V(2). Record the median, minimum and maximum values of V(2) from the simulation. Median ___ V. Minimum ___ V. Maximum ___ V. (C) 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. Nominal ___ V. Minimum ____ V. Maximum ___ V.

Explanation / Answer

(a)we start by constructing the circuit by using Rbreak parts for the resistors instead of Rparts Go to Edit/Model/Editinstance model notice for R1break model R1=15 ohms dev=20% and for the R2break model R2=10 ohms dev=30% which tells of the nominal value 15 and 10 respectively and the device tolerances of 20 and 30% respectively. double click the part on the schematic o bring up the dialog box select and edit the line value Then click on the change display button choose value only and then click ok twice now the nominal value will directly show up on the schematic and can be directly edited by double clicking. To run the MC analysis we need to set up dc sweep and mc parameters.Using Analysis/Setup ,setup the dc sweep and setup the mc box To get the mc analysis histogram place the current marker on R2and differentialvoltage marker across R2. Select Analysis/simulate to run the simulation. (b) record the median ,minimum and maximum values from the histogram (c) From the circuit nominal value of V2 from the voltage divider theorem is V2=Vin* R2/(R1+R2)=16V for minimum we take minimum tolerance of R1 and R2 V2 min=14.736V similarly for maximum we take maximum tolerance of R1 and R2 V2 max=16.77V

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