THE DESIGNER'S GUIDE TO VERILOG-AMS First Edition June 2004

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1 THE DESIGNER'S GUIDE TO VERILOG-AMS First Edition June 2004 KENNETH S. KUNDERT Cadence Design Systems OLAF ZINKE Cadence Design Systems k4 Kluwer Academic Publishers Boston/Dordrecht/London

2 Chapter 1 Introduction 1 1 Hardware Description Languages 1 2 The Verilog Family of Languages 2 3 Mixed-Signal Simulators 5 4 Applications of Verilog-AMS Component Modeling lest Benches Simulation Acceleration Mixed-Signal Design Top-Down Design 11 Chapter 2 Top-Down Design 13 1 Mixed-Signal Design Productivity 13 2 Traditional Approaches to Mixed-Signal Design Bottom-Up Design Moving to Top-Down Design 17 3 Principles of Тор-Down Design A Shared Design Representation Every Change is Verified Verification Planning Multiple Passes Executable Specifications and Plans 23 4 A Rigorous Тор-Down Design Process Simulation and Modeling Plans System-Level Verification Mixed-Level Simulation Bottom-Up Verification Final Verification lest 30 5 Further Benefits of Top-Down Design Improves Communications Between Engineers Improves Productivity Improves Ability to Handle Complex Designs Allows Parallel Execution of Design Tasks Supports IP Reuse 31

3 6 Final Words on Тор-Down Design 32 Chapter 3 Analog Modeling 35 1 Resistor Capacitor Inductor Voltage and Current Sources 41 2 A Simple Circuit Conservative Systems 46 3 Motor Natures and Disciplines 51 4 Junction Diode Junction Diode with Series Resistor Probes and Sources Series and Parallel RLC 63 5 Resistive Port 65 6 Relay Non-Ideal Relay Ideal Mechanical Stop Ideal Diode 73 7 Voltage-Controlled Oscillator 73 8 Periodic Sample and Hold Smoothing the Output 79 9 Time Interval Measurement Analog to Digital Converter Digital to Analog Converter Lossy Inductor Tolerances Elements of Style 96 Chapter 4 Mixed-Signal Modeling 99 1 Mixed Signal Models 99 2 Modeling Discrete Behavior Language Basics Integers and Reals Modeling Mixed-Signal Behavior Analog and Digital Contexts From Digital to Analog From Analog to Digital Structural Verilog-AMS Connecting Analog and Digital Discipline Resolution Automatic Connect Module Insertion Modeling Connect Modules 131 w

4 Chapter 5 Language Reference Basics Comments Identifiers Keywords Compiler Directives Data Types Constants Variables Parameters Natures and Disciplines Ports, Nets, and Nodes Branches Signals Continuous-Time Signal Access Contributions Expressions Operators Functions Mathematical Functions Logical Functions Environment Functions Analog Operators Thresholding Functions Limiting Functions Small-Signal Stimulus Functions User-Defined Functions System Functions and Tasks Simulator Interface Display Tasks File Operation Tasks Random Numbers Analog Behavior Analog Processes Procedural Blocks Assignments Contributions Conditionals Iterators User-Defined Analog Functions Analog Events Discrete-Event Behavior Initial and Always Processes Procedural Blocks 209

5 7.3 Concurrent Blocks Assignments Nets and Registers Timing Control Conditionals Iterators User-Defined Functions and Tasks Mixed Behavior Discrete-Event Values in an Analog Process Discrete Events in an Analog Process Continuous-Time Values in an Initial or Always Process Continuous Events in an Initial or Always Process Calling Functions Hierarchy Modules Instantiation Gate-Level Descriptions Hierarchical Names Mixed Signal Structure Other Features of Verilog-HDL 234 Appendix A Compatibility Verilog-HDL Compatibility SPICE Compatibility Scope of Compatibility Accessing SPICE Objects from Verilog-A/MS Preferred Primitive, Parameter and Port Names Other Issues Spectre Compatibility Using Verilog-A with Spectre Accessing Spectre Objects from Verilog-A Spectre's Implementation of Verilog-A AMS Designer Compatibility Using Verilog-AMS with AMS Designer Referencing SPICE Referencing VHDL-AMS 257 VIII

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