PSpice By Jirawat Kanjanapitak (Tae)

Introduction Created by Cadence TM Benefits of PSpice  Be able to solve difficult circuits  Save time & easy to use  Test schematic before construct a circuit

How to Start  Go to Start  All Programs  Orcad Family Release  PSpice Student  Schematics

Choosing the Components  Go to Draw  Get New Part..  Shortcut : Ctrl G  Type in the Name Ex. Type “R”  Choose “Place” Or “Place & Close”

How to Draw  Choose and place all the components that you need. (Ground = GND_EARTH, Voltage Source = VDC) Tips: To flip – Ctrl P, to rotate – Ctrl R  Connect them with a “Draw Wire” option. Shortcut : Ctrl W

Specify the Values  Double click on each components Ex. Change VDC to 5V, R1 to 2k ohms, and R2 to 3k ohms

Simulation  Click “Simulate”  Click “V” and “I”

Example

Calculation Simplify the circuit R4||R3 = 2*4/(2+4) = 4/3 Ohms Assign I 1, I 2, and I 3 current Set up equations: 0 = 5I 1 + 2I 2 – ) 0 = 3I 3 – 2I 2 + (4/3)I ) I 1 = I 3 + I )  Solve all three

Results  Ans. I 1 = 0.58A. I 2 = 3.55A. I 3 = -2.98A.

Result from PSpice

Questions