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Table of Contents Table of Contents Introduction 19 SwitcherCAD III Overview ............................................................................. 19 Hardware Requirements................................................................................ 20 Software Installation ...................................................................................... 20 License Agreement/Disclaimer...................................................................... 21 Modes of Operation 23 Overview........................................................................................................ 23 Synthesized Circuits ...................................................................................... 24 Application Note Circuits ............................................................................... 25 Example Circuits............................................................................................ 26 General Purpose Schematic Driven SPICE .................................................. 27 Externally Generated Netlists........................................................................ 28 Efficiency Report ........................................................................................... 29 Schematic Capture 31 Basic Schematic Editing................................................................................ 31 Label a node name........................................................................................ 35 Schematic Colors .......................................................................................... 36 Placing New Components ............................................................................. 37 Programming Keyboard Shortcuts ................................................................ 37 PCB Netlist Extraction ................................................................................... 38 Editing Components ...................................................................................... 38 Editing Components................................................................................ 38 Edit a visible attribute.............................................................................. 39 Specialized Component Editors.............................................................. 40 General Attribute Editor .......................................................................... 41 Creating New Symbols .................................................................................. 43 Symbol Editing Overview ........................................................................ 43 Drawing the body .................................................................................... 43 Adding the Pins....................................................................................... 44 Adding Attributes..................................................................................... 45 Attribute Visibility..................................................................................... 47 Hierarchy ....................................................................................................... 48 Hierarchy Overview................................................................................. 48 Rules of Hierarchy................................................................................... 49 Navigating the Hierarchy......................................................................... 50 Waveform Viewer 52 Overview........................................................................................................ 52 Trace Selection.............................................................................................. 52 Zooming......................................................................................................... 56 Waveform Arithmetic ..................................................................................... 56 User-Defined Functions................................................................................. 61 Axis Control ................................................................................................... 62 Plot Panes .....................................................................................................62 Color Control.................................................................................................. 63 Attached Cursors........................................................................................... 64 Save Plot Configurations............................................................................... 67 1 LTspice 68 Introduction.................................................................................................... 69 Circuit Description................................................................................... 69 General Structure and Conventions........................................................ 69 Circuit Element Quick Reference............................................................ 72 Dot Commands.............................................................................................. 73 C. Simulator directives -- dot commands............................................... 73 .AC -- Perform an small signal AC analysis............................................ 74 .BACKANNO -- Annotate the subcircuit pin names to the port currents. 74 .DC -- Perform a DC source sweep analysis .......................................... 75 .END – End of netlist............................................................................... 75 .ENDS – End of Netlist............................................................................ 76 .FOUR -- Compute a Fourier component after a transient analysis ....... 76 .FUNC - User defined functions .............................................................. 76 .GLOBAL -- Declare global nodes .......................................................... 77 .IC -- Set initial conditions ...................................................................... 78 .INCLUDE -- Include another file ............................................................ 78 .LIB -- Include a library............................................................................ 79 .MODEL – Define a SPICE model .......................................................... 79 .NODESET -- Supply hints for initial DC solution ................................... 80 .NOISE -- Perform a noise analysis....................................................... 81 .OP -- Find the DC operating point ........................................................ 81 .OPTIONS -- Set simulator options......................................................... 82 .PARAM -- User-defined parameters..................................................... 84 .SAVE -- Limit the amount of saved data............................................... 86 .STEP -- Parameter sweeps ................................................................... 86 .SUBCKT -- Define a subcircuit ............................................................. 87 .TEMP -- Temperature sweeps............................................................... 88 .TF -- Find the DC small-signal transfer function ................................... 89 .TRAN -- Perform a nonlinear transient analysis ................................... 89 .WAVE -- Write selected nodes to a .wav file. ........................................ 90 Transient Analysis Options............................................................................ 91 .TRAN Modifiers...................................................................................... 91 UIC .......................................................................................................... 91 startup ..................................................................................................... 92 steady...................................................................................................... 92 nodiscard................................................................................................. 92 step ......................................................................................................... 92 Circuit Elements ............................................................................................ 93 A. Special functions................................................................................ 93 B. Arbitrary behavioral voltage or current sources................................. 96 C. Capacitor ............................................................................................ 99 D. Diode ................................................................................................ 102 E. Voltage Dependent Voltage Source ................................................. 104 F. Current Dependent Current Source.................................................. 106 G. Voltage Dependent Current Source................................................. 106 H. Current Dependent Voltage Source ................................................. 108 I. Current Source................................................................................... 108 J. JFET transistor.................................................................................. 113 K. Mutual Inductance ............................................................................ 114 L. Inductor ............................................................................................. 115 M. MOSFET .........................................................................................
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