Analysis and simulation of integrated circuits
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課程名稱 : 積體電路分析與模擬 (Analysis and Simulation of Integrated Circuits) - PowerPoint PPT Presentation


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課程名稱 : 積體電路分析與模擬 (Analysis and Simulation of Integrated Circuits). Text Books 1. 電腦輔助電子電路設計 , 鄭群星 , 全華 2. Reference Books 1. OrCAD PSpice and Circuit Analysis, J. Keown 2. Real Word FPGA Design with Verilog, Coffman. 任課教師及相關資料. 授課教師 : 李宗演 研究室 : 綜科館 207-4 E-mail: [email protected]

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Analysis and simulation of integrated circuits
課程名稱: 積體電路分析與模擬(Analysis and Simulation of Integrated Circuits)

  • Text Books

    1. 電腦輔助電子電路設計, 鄭群星,全華

    2.

  • Reference Books

    1. OrCAD PSpice and Circuit Analysis, J. Keown

    2. Real Word FPGA Design with Verilog, Coffman


任課教師及相關資料

  • 授課教師: 李宗演

  • 研究室: 綜科館 207-4

  • E-mail: [email protected]

  • URL: www.ntut.edu.tw/~tylee/

  • Tel: 02-2771-2171 ext. 2251

  • Office Hour: 星期三及四 10:00~12:00


Goal

  • Introduce the methodologies of analysis and simulation on integrated circuits

  • Learn the analysis and simulation techniques on analog circuits using OrCAD PSpice tool

  • Learn the design and simulation techniques on digital circuits using Xilinx FPGA design tool kit


Progress of course
Progress of Course

  • Analysis and Simulation Techniques on Analog Circuits Using OrCAD PSpice Tool/ 8 Weeks

  • Design and Simulation Techniques on Digital Circuits Using Xilinx FPGA Design Tool Kit / 8 Weeks



Scores
Scores

  • Term Exam 30%

  • Final Exam 30%

  • Home Works, Computer Exercises, and Others 40%


Question answer
Question & Answer

  • ? ? ? ? ? ?



Design concept verification
Design Concept Verification

  • The design is described in equations or behavioral expressions

  • This high-level design description is then simulated or verified to match with expected result


Design implementation verification
Design Implementation Verification

  • Simulates the physical design

  • The simulated result should match with the expected specification


Design performance verification
Design Performance Verification

  • Predicts or verifies the design “quality”

  • Post-layout simulation with extracted RCs is needed in nanometer technology


Verification methodologies
Verification Methodologies

  • Dynamic simulation

    • Examples: SPICE, Verilog

  • Static verification or analysis

    • Examples: Formal verification, static timing analysis


Dynamic vs static verification
Dynamic vs Static Verification

  • Dynamic simulation mimics the physical behavior

  • Difficult to select the input stimulus pattern to cover all possible verifications using dynamic simulation

  • More time consuming to simulate many possible test patterns

  • Static verification tends to validate the design still works under all possible working conditions

  • Static verification is less accurate and may give wrong results occasionally

  • Static verification is limited to digital circuits only


Important simulation technologies
Important Simulation Technologies

  • Complier code logic simulation

  • Transistor-level SPICE-like circuit simulation

  • Switch-level transistor circuit simulation

  • Fast SPICE circuit simulation

  • Analog behavioral simulation

  • Hierarchical circuit simulation


Complied code logic simulation
Complied Code Logic Simulation

  • Complier the digital circuit into a sequence of computer machine code

  • Traditional interpretation method looks up the logic gate model to simulate the digital state changes

  • Machine code execution runs faster than procedural interpretation


Spice circuit simulation
SPICE Circuit Simulation

  • Developed at UC Berkeley in early 1970s

  • Models and simulations the electrical-level circuit behavior accurately

  • Widely used due to open release to public users

  • Solves the whole circuit as a single entity

  • Slow and limited to speed circuit size less than 100,000 elements

  • Earlier attempts to speed up simulation, including waveform relaxation and iterative method, failed to commercialize

  • Fast SPICE simulation technology achieved commercial success until late 1990s


History of dynamic simulation
History of Dynamic Simulation

  • Logic simulation and circuit simulation are converging into a mixed-signal simulation







Switch level simulation
Switch-Level Simulation

  • Models MOSFET as a switch

  • Able to model the bi-directional signal flow behavior of MOSFET

  • Simulates the flat transistor netlist extracted from physical layout

  • Simulation speed is 1,000X faster than SPICE and is close to gate-level logic simulation

  • Limited in digital circuit only

  • A hot technology in 1980s but only achieved limited commercial success



Switch level timing simulation
Switch-Level Timing Simulation

  • Models the conducting MOSFET by an equivalent resistance

  • Calculates the switching delay by the RC time constant

  • Limited to digital CMOS circuit simulation

  • Unable to simulate analog behavior even in digital circuits


Analog event driven simulation
Analog Event-Driven Simulation

  • Similar to digital logic simulation except the event is triggered by analog voltage change instead of logic state transition


Fast spice circuit simulation
Fast SPICE Circuit Simulation

  • Partitions the whole circuit into smaller subcircuits and solves each one individually

  • Runs 10-100X faster than SPICE

  • Can simulate circuits up to 5 million elements

  • Simulates analog behavior in digital circuits

  • Less accurate especially when simulating high-sensitivity analog circuits

  • Gets more acceptance due to new enhancements in simulating analog circuits


Analog behavioral simulation
Analog Behavioral Simulation

  • Needed in top-down analog/mixed-signal design flow

  • Further speeds up verification

  • A new trend: device model described in Verilog-A

  • Verifies design concept instead of design implementation

  • Very difficult to create and characterize the analog behavior model


Use spice or mixed signal simulation
Use SPICE or Mixed-Signal Simulation

  • Mixed-signal simulator is difficult to use

  • No need if SPICE performance is reasonable

  • Fast SPICE may do a better job if majority portions are analog


Reference
Reference

  • A.-C. Deng, Signal Integrity in SOC Design, SOC/IP 菁英人才養成課程, 三C整合策劃推行小組, July 2002.




Spice
SPICE 模擬電路程式之功能

  • DC Analysis

  • Small Signal Transfer Function

  • DC Transfer Curves

  • Small Signal Sensitivities

  • Small Signal Frequency Domain Response

  • Noise Analysis

  • Distortion Analysis

  • Transient Analysis

  • Fourier Analysis

  • Temperature Analysis



Orcad pspice 1
OrCAD PSpice使用電路描述模擬的方式(1)

  • 開始→程式集→OrCAD family release 9.2 Lite Edition →PSpiceAD Lite Edition

  • File→New→Text File

  • 依OrCAD PSpice描述格式將電路輸入, filename為XXX.CIR


Orcad pspice 2
OrCAD PSpice使用電路描述模擬的方式(2)


Orcad pspice 3
OrCAD PSpice使用電路描述模擬的方式(3)


Orcad pspice 4
OrCAD PSpice使用電路描述模擬的方式(4)

  • File→Open→XXX.CIR

  • Simulation File→Run XXX

  • View→Outputfile

    (出現輸出檔視窗XXX.out)


Orcad pspice 5
OrCAD PSpice使用電路描述模擬的方式(5)


Orcad pspice 6
OrCAD PSpice使用電路描述模擬的方式(6)


Orcad pspice 7
OrCAD PSpice使用電路描述模擬的方式(7)

  • File→Exit (Exit OrCAD PSpice)


Orcad pspice 11
OrCAD PSpice使用繪圖描述模擬的方式(1)

  • 開始→程式集→OrCAD family release 9.2.1 Lite Edition →Capture Lite Edition


Orcad pspice 21
OrCAD PSpice使用繪圖描述模擬的方式(2)

  • File→New→Project


Orcad pspice 31
OrCAD PSpice使用繪圖描述模擬的方式(3)

  • Location → 輸入C:\OrCAD pspice\project\example1 →OK (目錄要先存在)

  • Create a blank project


Orcad pspice 41
OrCAD PSpice使用繪圖描述模擬的方式(4)

  • Project Manager and Schematic page Editor


Orcad pspice 51
OrCAD PSpice使用繪圖描述模擬的方式(5)

  • 繪圖及模擬: 1. 取元件 ~ 直流電源

  • Place → Part → Begin Search → VDC→ VDC/source.olb


Orcad pspice 61
OrCAD PSpice使用繪圖描述模擬的方式(6)

  • 繪圖及模擬: 1. 取元件 ~ 電阻

  • Place → Part → Begin Search → R/analog.olb →ok (Ctrl + R 轉動用)


Orcad pspice 71
OrCAD PSpice使用繪圖描述模擬的方式(7)

  • 繪圖及模擬: 1. 取元件 ~ 地線

  • Place → Ground, libraries →SOURCE, Symbol →0 →ok


Orcad pspice 8
OrCAD PSpice使用繪圖描述模擬的方式(8)

  • 繪圖及模擬: 2. 開始連線

  • Place → Wire


Orcad pspice 9
OrCAD PSpice使用繪圖描述模擬的方式(9)

  • 繪圖及模擬: 3.改變元件的屬性~電源

  • 在該VDC元件以mouse左鍵連續按兩次


Orcad pspice 10
OrCAD PSpice使用繪圖描述模擬的方式(10)

  • 繪圖及模擬: 3.改變元件的屬性~電阻

  • 改變電阻的屬性之方法與改變電源的屬性類似


Orcad pspice 111
OrCAD PSpice使用繪圖描述模擬的方式(11)

  • 繪圖及模擬: 4. 加入元件節點編號

  • Place → Net Alias →1 →Ok →放置電路中


Orcad pspice 12
OrCAD PSpice使用繪圖描述模擬的方式(12)

  • 繪圖及模擬: 5. 電路圖存檔

  • File →Save →OrCAD Capture 對話盒→OK


Orcad pspice 13
OrCAD PSpice使用繪圖描述模擬的方式(13)

  • 繪圖及模擬: 6. 產生網路連接表Letlist

  • PSpice →Create Netlist

  • 繪圖及模擬: 7. 觀看網路連接表

  • PSpice → View Netlist


Orcad pspice 14
OrCAD PSpice使用繪圖描述模擬的方式(14)

  • 繪圖及模擬: 8. 開始模擬

  • PSpice →New Simulation profile


Orcad pspice 15
OrCAD PSpice使用繪圖描述模擬的方式(15)

  • 設定Analysis type


Orcad pspice 16
OrCAD PSpice使用繪圖描述模擬的方式(16)

  • PSpice →Run


Orcad pspice 17
OrCAD PSpice使用繪圖描述模擬的方式(17)

  • View →output file (模擬的輸出之結果)



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