User`s guide

4 Parametric and Temperature Analysis

This series of PSpice A/D runs varies the value of resistor R1

from 0.5 to 1.5 ohms in 0.1 ohm steps. Since the time-constant

of the circuit is about one second, we perform a transient

analysis of approximately 20 seconds.

Create the circuit in MicroSim Schematics by placing a

piecewise linear independent current source (IPWL from

source.slb). Set the current source attributes as follows:

AC = 1a

T1 = 0s

I1 = 0a

T2 = 10ms

I2 = 0a

T3 = 10.1ms

I3 = 1a

Place an instance of a resistor and set its VALUE attribute to the

expression, {R}. To define R as a global parameter, place a

PARAM pseudocomponent defining its NAME1 attribute to R

and VALUE1 attribute to 0.5. Place an inductor and set its value

to 1H, place a capacitor and set its value to 1, and place an

analog ground symbol (AGND from

port.slb). Wire the

schematic symbols together as shown in Figure 12-1.

Runnin

the simulation

Run PSpice A/D with the following analyses enabled:

After setting up the analyses, start the simulation by selecting

Simulate from the Analysis menu.

transient print step: 100ms

final time: 20s

parametric swept var. type: global parameter

sweep type: linear

name: R

start value: 0.5

end value: 1.5

increment: 0.1

or press !