hspice tutorial(2011)

Introduction to Hspice

2011/10/28

Advisor: Ke-Horng Chen

Speaker: Wei-Chung Chen

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Output and Controls

Graphic tools

Reference: CIC SPICE Note

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SPICE Overview

Simulation:

Predicting the Circuit/System Characteristic after manufacturing

Circuit simulation:

Physical model

Circuit structure

SPICE:

Simulation Program with Integrated Circuit Emphasis

SPICE tools (HSPICE, Spectre, PSPICE…)

Steady-State, Transient, and Frequency Domains

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Basic Flow for SPICE

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Output and Controls

Simulation tool & Graphic tools

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HSPICE Data Flow 1. Write circuit

2. Simulation the circuit

3. Awaves tools

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Net Structure ( SPICE Preferred )

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Element and Node Naming Conventions

Either Names or Numbers (e.g. d1 a1 b22)

0 (zero) = Ground

Ignoring trailing Alphabetic Character in Node Number (e.g. 5a=5b=5)

Ground may be 0, GND

All nodes = Local

.GLOBAL Statement (e.g. .GLOBAL VDD VSS )

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Element and Node Naming Conventions

(Cont.)

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Unit and Scale Factors

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Input Control Statement: .option

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Input Control Statement: .option (con’t)

.option method = gear Most stable

Analog

Switching regulator, using gear algorithm

.option method = trap Highest accuracy

Lowest simulation time

Best for CMOS digital circuit

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Input Control Statement: .temp

.Temp statement: No Specifying → Defaulting 25ºC for HSPICE

Library Input Statement

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Input Control Statement: .alter

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Input Control Statement: .alter

(cont’d)

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Description of MOSFET

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Hierarchical Circuit

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Hierarchical Circuit (con’t)

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Input and Controls

Simulation tool & Graphic tools

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DC, AC Sources

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Transient Sources

Transient sources statement:

Pulse (PULSE Function)

Sinusoidal (SIN Function)

Exponential (EXP Function)

Piecewise Linear (PWL Function)

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Pulse Source Function

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Sinusoidal Source Function

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Piecewise Linear Source Function

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Voltage and Current Controlled Elements

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Output and Controls

Simulation tool & Graphic tools

Reference: CIC Note

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Analysis Types & Orders

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DC Sweep & DC Small Signal Analysis

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DC Sweep & DC Small Signal Analysis

(con’t)

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AC Sweep & AC Small Signal Analysis

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AC Sweep & AC Small Signal Analysis

(con’t)

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Transient Analysis

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Transient analysis (Cont.)

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Output and Controls

Simulation tool & Graphic tools

Reference: CIC Note

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Output Files Summary (HSPICE)

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Output Statement

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Content

SPICE Overview

Simulation Input and Controls

Sources

Analysis Types

Simulation Output and Controls

Simulation tool & Graphic tools

Reference: CIC Note

Simulation tool-Hspice

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看波形 執行模擬

目前模擬檔案

選擇模擬檔案

(1st step)

Open XXX.sp (可進行編輯)

Open XXX.lis (內有模擬完的資訊)

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Graphic tools-Awaves

Tool button

menu

Waveform data waveform

選擇欲觀察的波形中的訊號 (1st step) (見下一頁)

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Result browser

Step1: Analysis type

Step2: Instant name and hierarchy

Set X axis

Data name and data type

Design name

Step3: Step4:

Step5:

42

Awaves Windows 放大鏡工具

常用的觀察工具

跑頻率響應的模擬 要在橫軸上點右鍵 改單位log

Example

(1) op.sp.op

(2) ac.sp.ac-頻率響應分析

(3) dc.sp.dc-dc掃描

(4) tr.sp.tran-時域分析

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模擬檔案 輸出檔案 註解1 註解2

(1) op.sp op.list DC operation point 以記事本打開

(2) ac.sp ac.ac0 Frequency Analysis

波形黨 (3) dc.sp dc.sw0 DC Sweep

(4) tr.sp tr.tr0 Transient response

XXX.list

以記事本打開 (1)搜尋關鍵字”concluded”

(2)mos的名子

重要資訊 (3)Ids

(4)VGS、VDS

(5)VTH

(6)VGS-VTH

(7)gm

(8)1/rDS

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(1)

(2)

(3)

(4)

(6)

(5)

(7)

(8)

dc.sp / op.sp / ac.sp

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VSS

VDrain

VGate

VSS

VINVOUT

AC 1V

dc.sp op.sp

ac.sp

tr.sp

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VDD

VSS

db cinv0 inv1

MP0

MN0

Cout

a

Appendix: SPICE Instructions

DC Analysis:

.dc temp -40 120 10

.dc Vdrain 0 5 0.1 sweep VGate 3 5 0.1

AC Analysis

.ac dec 10 1 10G

.ac dec 10 1 10G sweep temp -40 120 10

.probe vdb(XXX) vp(XXX)

Transient Analysis:

.tran 1n 100u

.tran 1n 100u UIC

.tran 1n 100u sweep temp -40 120 20

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Thanks for your attention!

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