VHDL-AMS入门教程.pdf

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Analog and Mixed-Signal Modeling Using the VHDL-AMS Language

Tutorial Organization

Part I: Introduction to the VHDL-AMS Language

Introduction

What is VHDL-AMS

Why is VHDL-AMS needed?

Brief Overview of VHDL-AMS

VHDL 1076 Overview

VHDL-AMS Language Architecture

VHDL-AMS Highlights (1)

VHDL-AMS Highlights (2)

Basic Concepts: DAEs

Vibration in biatomic molecule

Quantities (1)

Quantities (2)

Simultaneous Statements (1)

Simultaneous Statements (2)

Tolerances (1)

Tolerances (2)

Tolerances (3)

Systems with Conservation Semantics

Parameterized Diode

VHDL-AMS Model of Diode

Terminal

Nature

Electrical Systems Environment

Branch Quantities (1)

Branch Quantities (2)

Terminal Attributes

Mixed Technology

Diode with Self Heating

VHDL-AMS Model Environment

VHDL-AMS Entity Declaration

VHDL-AMS Architecture Body

Test Bench

Basic Thermal Elements

Piecewise Defined Behavior

Compressor

Piecewise Defined Behavior (2)

Voltage Limiter

Procedural Modeling

Weighted Summer

VHDL-AMS Entity Declaration

VHDL-AMS Architecture Body (1)

VHDL-AMS Architecture Body (2)

VHDL-AMS Architecture Body Revisited

Signal-Flow Modeling

Adder-Integrator

Signal Flow Modeling (2)

Signal Flow Test Bench

Conversion

Solvability

Solvability Checks (1)

Solvability Checks (2)

Initial Conditions

Initial Conditions (1)

Initial Conditions (2)

Implicit Quantities

Implicit Quantities (1)

Implicit Quantities (2)

Mixed-Signal Modeling

Ideal Comparator: Entity

Ideal Comparator: Architecture

Comparator with Hysteresis

State Diagram

VHDL-AMS Declarations

VHDL-AMS Process Implementing FSM

D/A Converter

Entity Declaration

Architecture Body

VHDL-AMS Model Execution

VHDL-AMS Initialization

DOMAIN Signal

VHDL-AMS Simulation Cycle: Time Domain Simulation

Discontinuities

Silicon Controlled Rectifier: Entity

Architecture Body

Break Statement

Voltage Limiter Revisited

Bouncing Ball

Time-Dependent Modeling

Sinusoid Voltage Source

Time-Dependent Modeling

Frequency Domain Modeling

Current Source with AC Spectrum

2nd Order Lowpass Filter

Noise Modeling

Resistor Model with Thermal Noise

Diode with Flicker Noise

Conclusion

Additional Information

Part II: VHDL-AMS in Practical Applications

VHDL-AMS Modeling Guidelines

Overview of VHDL-AMS Modeling Guidelines

VHDL-AMS Modeling Utilities

Packages

Package Architecture

MEMS VHDL-AMS Modeling

Across/Through Quantities

VHDL-AMS Types and Subtypes (1)

VHDL-AMS Types and Subtypes (2)

Sample Common Declarations

Package: ENERGY_SYSTEMS

Package: ELECTRICAL_SYSTEMS

Package: MECHANICAL_SYSTEMS

VHDL-AMS Modeling Techniques

Overview

Technology and Geometry Parameters

Sharing of Technology Parameters

Revised Diode Architecture

Handling of Defaults

Revised Diode Entity

Use in Netlist

Ambient Temperature: The Problem

Ambient Temperature: The Solution

Ambient Temperature: Example

Global Nets

Global Nets: Example

Global Nets: Test Bench

Modeling at Different Levels of Abstraction

A VCO from a Telecom Library

The VCO in its Native Element

Parameters of the VCO

Theory of Operation

The Model

Check the Generics!

1st Architecture: Constants and Quantities

The Schmitt Trigger

The Equations

Adding Second Order Effects

Check the Generics

2nd Architecture: Constants

Quantities

The Schmitt Trigger is Unaltered

The Equations Change

Modeling of Multi-Disciplinary Systems

Overview

Modeling of Multi-Disciplinary Systems

Component Library Using VHDL-AMS

Use of Mixed-Domain/Mixed-Level (1)

Use of Mixed-Domain/Mixed-Level (2)

Controler Design for Revolving Load (1)

Controler Design for Revolving Load (2)

Revolving Load: Stick/Slip-Friction (1)

Revolving Load: Stick/Slip-Friction (2)

Revolving Load: Stick/Slip-Friction (3)

Simulation Results of Stick/Slip-Friction

Revolving Load: Backlash in Gear-Box

Simulation Results of Backlash

Plant Modeling for Component Design

Including Multi Body Systems

Scenario for Model Exchange

Approach Towards Unified Modeling (1)

Approach Towards Unified Modeling (2)

Approach Towards Unified Modeling (3)

Conclusion

Appendix: VHDL-AMS Source Code of Revolving Load

Entity Declaration

Architecture Body (1)

Architecture Body (2)

Architecture Body (3)

Architecture Body (4)

Architecture Body (5)

Architecture Body (6)

MEMS Modeling Using the VHDL-AMS Language

MEMS Accelerometers

Accelerometer Performance Characteristics

Accelerometer Applications

MEMS Accelerometers (1)

MEMS Accelerometers (2)

Microflexural Structures

Damped Harmonic Oscillator

2nd Order Differential Equation

Canonical Response

MEMS Accelerometers

Capacitive Sensing

Capacitive Sensing Configurations

Differential Capacitance Sensing

Transverse Linear Comb Drive

Capacitance Bridge (Analog Sampling)

MEMS Accelerometers

VHDL-AMS Model - Organization

Design Entity: Acceleration Source

Design Entity: Voltage Source

Design Entity: Transducer

Design Entity: Transducer (continued)

Design Entity: MEMS Accelerometer

Design Entity: MEMS Accelerometer (continued)

Sample Simulation Results

Sample Simulation Results (continued)

Improved MEMS Accelerometer Model

Parasitic Capacitances

Electrostatics

Electrostatic/Mechanical Elasticity

Constructing Modeling Levels

VHDL VHDL AMSAMS 36th Design Automation Conference New Orleans, June 21-25, 1999 Analog and Mixed-Signal Modeling Using the VHDL-AMS Language Ernst Christen Beaverton, OR Kenneth Bakalar Rockville, MD Allen M. Dewey Durham, NC Eduard Moser Stuttgart, Germany (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO

VHDL VHDL AMSAMS Tutorial Organization Part I: Introduction to the VHDL-AMS Language • Continuous Time Concepts • Mixed Continuous/Discrete Time Concepts • Frequency Domain and Noise Modeling Part II: VHDL-AMS in Practical Applications • VHDL-AMS Modeling Guidelines • VHDL-AMS Modeling Techniques IC Applications • Modeling at Different Levels of Abstraction Telecom Applications • Modeling Multi-Disciplinary Systems Automotive Applications • MEMS Modeling Using the VHDL-AMS Language (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO ¤ ¤

VHDL VHDL AMSAMS Part I: Introduction to the VHDL-AMS Language (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO

VHDL VHDL AMSAMS Outline Introduction Brief Overview of VHDL-AMS Basic Concepts: DAEs Systems with Conservation Semantics: Diode ¤ Mixed Technology: Diode with Self Heating Piecewise Defined Behavior: Compressor,Voltage Limiter Procedural Modeling: Weighted Summer Signal-Flow Modeling: Adder-Integrator, Conversions Solvability: Voltage Source, Signal Flow Amplifier Initial Conditions: Capacitor Implicit Quantities ¤ Mixed-Signal Modeling: Comparators, D/A Converter VHDL-AMS Model Execution Discontinuities: SCR, Voltage Limiter, Bouncing Ball Time-Dependent Modeling: Sinusoid Voltage Source Frequency Domain Modeling: Current Source, Filter Noise Modeling: Resistor, Diode ¤ Conclusion (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤

VHDL VHDL AMSAMS What is VHDL-AMS IEEE Std. 1076-1993: • VHDL (VHSIC Hardware Description Language) supports the description and simulation of event-driven systems. IEEE Std. 1076.1-1999: • Extension to VHDL to support the description and simulation of analog and mixed-signal circuits and systems IEEE Std. 1076.1-1999 together with IEEE Std. 1076-1993 is informally known as VHDL-AMS ¤ VHDL-AMS is a strict superset of IEEE Std. 1076-1993 • Any model valid in VHDL 1076 is valid in VHDL-AMS and yields the same simulation results (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO ¤ ¤ ¤

VHDL VHDL AMSAMS Why is VHDL-AMS needed? ¤ VHDL 1076 is suitable for modeling and simulating discrete systems ¤ Many of today’s designs include at least some continuous characteristics: • System design Mixed-signal electrical designs Mixed electrical/non-electrical designs Modeling design environment • Analog design • Digital design Analog behavioral modeling and simulation Detailed modeling (e.g. submicron effects) ¤ Designers want a uniform description language (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO

VHDL VHDL AMSAMS VHDL 1076 Overview Entity defines interface of the model of a subsystem or physical device Each entity has one or more architectures, each implementing the behavior or structure of the subsystem or physical device Packages define collections of re-usable declarations and definitions: types, constants, functions etc. Strong type system Event-driven behavior described by processes that are sensitive to signals ¤ Well-defined simulation cycle, based on a canonical engine Predefined language environment (&KULVWHQ.%DNDODU$0'HZH\(0RVHU '$& 9+'/$067XWRULDO ¤ ¤ ¤ ¤ ¤ ¤

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