EE 2303 Week 2 EE 2303 Week 2

Overview Kirchoff’s Current Law (KCL) Kirchoff’s Voltage Law (KVL) Introduction to P-spice

Kirchoff’s Current Law (KCL) STATEMENT: Algebraic sum of all the currents entering and leaving a node is zero I1I1 I2I2 I3I3 I 1 -I 2 -I 3 =0

Kirchoff’s Voltage law (KVL) STATEMENT: Algebraic sum of all the voltages inside a closed loop is Zero

Introduction to PSpice Simulation Software

The Origins of SPICE –SPICE developed in the 1970’s Simulation Program with Integrated Circuit Emphasis –Developed to save money Simulation of circuits, not physically building Transistor sizes –Microprocessors vs. 2N2222

This Is Now New user interface Graphical circuit diagrams Variation of simulation parameters with a few clicks

First Look at Capture First window you will see when you open Capture Create a new Project –File  New  Project This will open a new window

Select a project name –PSpice Lab Simulation Select a project location –C:\PSpice\{YourName} Select what type of project –Analog or Mixed A/D Click OK New Project Window

Create PSpice Project This window will open Select the bottom option –Create a blank project Click OK

The Project Windows The Main Project Window Two other information windows –Session Log Window –Project File Window Our main window –Schematic 1: Page 1

Place Parts Place the 5 resistors –Using Place  Part –Type ‘R’ in Part Field Place the Voltage Source –Using Place  Part –Type ‘Vdc’ in Part Field Right click and choose “End Mode”

Rotate and Move Resistors Click on the resistor –Use ‘Ctrl+R’ to rotate –Repeat for 4 resistors Move and place the resistors in parallel Change the values –Double Click on the ‘1k’ and enter ‘4k’ of the parallel resistors

Change the Voltage and Wire Change DC Voltage –Double Click on ‘0Vdc’ and enter ’16Vdc’ Now wire the circuit –Using Place  Wire –Click on one node, and ‘draw’ to the other and click again Right click and select “End Mode”

Placing the Ground Every PSpice circuit must have a ground Use the icons on the right –9 th icon down This opens the “Place Ground” window Select the ‘0/Source’ Click OK

The Completed Circuit

Simulation Profile Need to create a simulation profile –PSpice  New Simulation Profile Name the profile –DC Solution Click OK

Edit the Simulation Profile Go to the Analysis Tab Under the Analysis type, choose Bias Point –This is to find the DC solution Click OK Ready to Simulate

Running the Simulation The last step is to RUN the simulation –Do this by selecting PSpice  Run After running the simulation a new window will open –Close this window and return to the Schematic 1: Page 1 window Use the “V” and “I” (and maybe “W”) icons on the top of the screen –For finding voltages and currents (and power)

Now You Know With this basic underlying knowledge –Can change Resistor values Voltage supply values Resistor configuration –Can learn More simulation parameters More components for simulation