1. Lab 1 LTspice Intro EC538 Selected Topics in Electronics 1 Eng. Nihal Tawfik

2. Lab Objective Proper understanding Devices Basics 2 Semiconductors Devices Models PN Junction (Diode) MOSFETS VLSI Fabrication and Layout Tools :  LT Spice IV http://ltspice.linear.com/software/LTspiceIV.exe  Electrical ftp://ftp.gnu.org/pub/gnu/electric/electric-9.03.jar Digital/Analog Course Project

3. Spice ›SPICE: Simulation Program with Integrated Circuit Emphasis ›Developed at UC Berkeley in the early 70’s. ›Commercial versions: –Hspice: Hailey-Spice owned by Synopsis run under Unix –Spectre: Cadence Unix Tool –Eldo: Mentor Tool –Pspice: Personal Spice owned by Cadence –LTSpice (FreeWare), Mica Spice, … 3

4. Spice Netlist ›Circuit are described in a text file called “Netlist”. ›Netlists are difficult to create for large circuits. 4

5. Spice GUI ›Therefore, Graphical Circuit Interface has been developed. ›Netlists are then automatically generated. 5

6. Analysis Types 1- Operating Point ›Using LTSpice: Find the corresponding voltages and current in the below circuit : 6

7. Analysis Types (ctd.) 2- DC Sweep ›Using LTSpice: Find the IV characteristics of the MUR460 diode. 7

8. Analysis Types (ctd.) 3- AC Sweep ›Using LTSpice: Find the operating bandwidth for the below circuit: 8

9. Analysis Types (ctd.) 4- DC Sweep ›Using LTSpice: Plot the output and input voltage for the below circuit: 9

10. Quick Hints on LTspice ›To start a new schematic: ›To add a component: ›To rotate an element : CTRL+R ›To place ground: ›To specify the simulation type: Edit ->Spice Analysis ›To display the cursors, right click on the expression name at the top of the plot pane. ›In AC sweep Analysis, the Bandwidth is displayed by right clicking while holding down the CTRL key. ›To edit a model: Go to :…\Program Files\LTC\LTSpiceIV\lib\cmp Choose : standard.mos : for MOSFET models standard.dio : for diode models standard.bjt : for BJT models 10