Virtuoso Spectre Circuit Simulator Reference - …

1 Virtuoso Spectre Circuit SimulatorReferenceProduct Version 2004 1990-2003 Cadence Design Systems, Inc. All rights in the United States of Design Systems, Inc., 555 River Oaks Parkway, San Jose, CA 95134, USAT rademarks:Trademarks and service marks of Cadence Design Systems, Inc. (Cadence) contained inthis document are attributed to Cadence with the appropriate symbol. For queries regarding Cadence strademarks, contact the corporate legal department at the address shown above or call other trademarks are the property of their respective Print Permission:This publication is protected by copyright and any unauthorized use of thispublication may violate copyright, trademark, and other laws.

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3 Cadence reserves the right to revoke this authorization at any time, and any such use shall bediscontinued immediately upon written notice from : Information in this publication is subject to change without notice and does not represent acommitment on the part of Cadence. The information contained herein is the proprietary and confidentialinformation of Cadence or its licensors, and is supplied subject to, and may be used only by Cadence scustomer in accordance with, a written agreement between Cadence and its customer. Except as may beexplicitly set forth in such agreement, Cadence does not make, and expressly disclaims, anyrepresentations or warranties as to the completeness, accuracy or usefulness of the information containedin this document.

4 Cadence does not warrant that use of such information will not infringe any third partyrights, nor does Cadence assume any liability for damages or costs of any kind that may result from use ofsuch Rights:Use, duplication, or disclosure by the Government is subject to restrictions as set forthin and et seq. or its Circuit Simulator ReferenceNovember 20041 Product Version Documents .. 6 Typographic and Syntax Conventions .. 6 References ..71 Introducing the Virtuoso Spectre Circuit Simulator .. 8 Improvements over SPICE.

5 9 Improved Capacity .. 9 Improved Accuracy .. 9 Improved Speed .. 10 Improved Reliability .. 11 Improved Models .. 12 Spectre Usability Features and Customer Service .. 12 Analog HDLs ..13RF Capabilities ..13 Mixed-Signal Simulation .. 15 Environments .. 152 Command Options.. 17 Default Values .. 22 Default Parameter Values .. 223 Analysis Statements.. 24AC Analysis (ac) .. 26 Alter a Circuit , Component, or Netlist Parameter (alter) .. 29 Alter Group (altergroup) .. 29 Check Parameter Values (check).

6 31 Checklimit Analysis (checklimit) .. 32 ContentsSpectre Circuit Simulator ReferenceNovember 20042 Product Version Analysis (dc) .. 33DC Device Matching Analysis (dcmatch) .. 37 Envelope Following Analysis (envlp) .. 41 Circuit Information (info) .. 46 Monte Carlo Analysis (montecarlo) .. 48 Noise Analysis (noise) .. 60 Immediate Set Options (options) .. 64 Periodic AC Analysis (pac) .. 74 Periodic Distortion Analysis (pdisto) .. 78 Periodic Noise Analysis (pnoise) .. 86 Periodic S-Parameter Analysis (psp).

7 92 Periodic Steady-State Analysis (pss) .. 98 Periodic Transfer Function Analysis (pxf) .. 112PZ Analysis (pz) .. 117 Quasi-Periodic AC Analysis (qpac) .. 122 Quasi-Periodic Noise Analysis (qpnoise) .. 125 Quasi-Periodic S-Parameter Analysis (qpsp) .. 131 Quasi-Periodic Steady State Analysis (qpss) .. 137 Quasi-Periodic Transfer Function Analysis (qpxf) .. 145 Deferred Set Options (set) .. 149 Shell Command (shell) .. 153S-Parameter Analysis (sp) .. 154 Stability Analysis (stb) .. 158 Sweep Analysis (sweep).

8 164 Time-Domain Reflectometer Analysis (tdr) .. 166 Transient Analysis (tran) .. 168 Transfer Function Analysis (xf) .. 1774 Syntax.. 182 Using analogmodel for Model Passing (analogmodel) .. 184 Behavioural Source Use Model (bsource) .. 186 Checkpoint - Restart (checkpoint) .. 191 Configuring CMI Shared Objects (cmiconfig) .. 192 Built-in Mathematical and Physical Constants (constants) .. 193 Spectre Circuit Simulator ReferenceNovember 20043 Product Version Difficulties (convergence) .. 195 Export (export).

9 196 Expressions (expressions) .. 197 User Defined Functions (functions) .. 201 Global Nodes (global) .. 202 Initial Conditions (ic) .. 203 The Structural if-statement (if) .. 203 Include File (include) .. 205 Spectre Netlist Keywords (keywords) .. 206 Library - Sectional Include (library) .. 210 Node Sets (nodeset) .. 213 Parameter Soft Limits (param_limits) .. 213 Netlist Parameters (parameters) .. 216 Parameter Set - Block of Data (paramset) .. 218 Output Selections (save) .. 219 Sensitivity Analyses (sens).

10 220 SpectreHDL Usage and Language Summary (spectrehdl) .. 221 SpectreRF Summary (spectrerf) .. 230 Subcircuit Definitions (subckt) .. 231 Verilog-A Usage and Language Summary (veriloga) .. 235.. 244 AReferences .. 245 Spectre Circuit Simulator ReferenceNovember 20044 Product Version Circuit Simulator ReferenceNovember 20045 Product Version manual assumes that you are familiar with the development, design, and simulation ofintegrated circuits and that you have some familiarity with SPICE simulation. It containsinformation about the Virtuoso Spectre Circuit is an advanced Circuit Simulator that simulates analog and digital circuits at thedifferential equation level.