OrCAD && PSPICE

Transcription

1 כלי תוכנה להנדסת חשמל ומחשבים OrCAD && PSPICE כל י תוכנ ה ל הנד סת חש מל ו מח שבים

2 2 Introduction OrCAD OrCAD products offer a total solution for core design tasks: schematic- and VHDL-based design entry; FPGA and CPLD design synthesis; digital, analog, and mixed-signal simulation; and printed circuit board layout. OrCAD products are a suite of applications built around an engineer's design flow not just a collection of independently developed point tools. PSpice is just one element in our total solution design flow.

3 3 Introduction PSpice PSpice is a simulation program that models the behavior of a circuit. PSpice simulates analog-only circuits, whereas PSpice A/D simulates any mix of analog and digital devices. Used with OrCAD Capture for design entry, you can think of PSpice as a software-based breadboard of your circuit that you can use to test and refine your design before manufacturing the physical circuit board or IC.

4 4 User Manuals

5 5 Documentation PSpice User s Guide PSpice Online help PSpice Advanced Analysis User s Guide PSpice Reference Guide PSpice Library List PSpice Advanced Analysis Library List PSpice Quick Reference OrCAD Capture User s Guide Windows Start OrCAD XX.X Online Documentation PSpice Help Manuals

6 6 Simulation Types Bias point DC sweep sweep of the parameter Time domain (transient) Frequency domain (AC/Noise) Additional (multi-run analyses) Parametric Temperature

7 7 Simulation Types (DC) Bias-point DC sweep 5Vdc 2.500mA in 5.000V V1 0V 2.500mA R V out 2.500mA R2 0 C1 1n V V out V in R2

8 8 A Simple Circuit (Example 1) in 5.000V 2.500mA R1 Small signal (V in =A sin(2πft)) V VAC 5Vdc VDC V2 V1 0V 2.500V out 2.500mA R2 0 C1 1n A 0.5A V out V in f

9 9 Simulation Types Bias-point Transient 5Vdc in 5.000V V1 0V R V R2 out C1 1n IC=5V V V in V out time 0

10 10 Starting Capture

11 11 OrCAD Capture Window

12 12 Creating the New Project

13 13 Page Setup_1

14 14 Page Setup_1

15 15 Placing Ground To place the ground parts (0), click the GND button on the tool palette If 0 ground is absent Add the library for the parts you need to place: Click the add library button Select SOURCE.OLB (from the PSpice library) and Click open Place the ground parts

16 16 Placing Parts From the place menu, choose part to display the place part dialog box Add the library (if not exists) for the parts you need to place: Click the add library button Select library (for example ANALOG.OLB from the PSpice library) and click open Follow similar steps as described for other parts

17 17 Resistor

18 18 R1 Connectors R1 5Vdc V1 R2 C1 5Vdc V1 1n R2 C1 1n 0 0 in Net alias: R1 5Vdc V1 out R2 C1 1n 0

19 19 Editing Parts Rotation: [CTR+R] Flip horizontally: [H] Flip vertically: [V] Double click every property to change Double click every part to see and edit full table of properties

20 20 Numeric value conventions Scale Symbol Name F femto P pico N nano U micro M milli K kilo MEG mega G giga T tera-

21 21 R1 Connectors R1 5Vdc V1 R2 C1 5Vdc V1 1n R2 C1 1n 0 0 in Net alias: R1 5Vdc V1 out R2 C1 1n 0

22 22 DC Operation New simulation profile Name of profile

23 23 PSpice toolbar in Capture

24 24 Simulation Settings (Bias Point)

25 25 Initial Conditions in 5.000V 2.500mA R1 in 5.000V R1 5Vdc 2.500mA V1 0V 2.500V out 2.500mA R2 0 C1 1n 5Vdc V1 0V 5.000V 0 R2 out C1 1n IC=5V

26 26 Questions Does Value of C have an influence on result of Bias point calculation result? Does IC have influence on result of Bias point calculation result?

27 27 Simulation Settings (DC Sweep)

28 28 Add Trace

29 29 Probe toolbar in PSpice

30 30 Simulation Settings

31 31 Questions Does Value of C have an influence on result of Bias point calculation result? Does IC have influence on result of Bias point calculation result?

32 32 Global Parameter

33 כלי תוכנה להנדסת חשמל ומחשבים

34 34 Simulation Settings (Global Parameter)

35 35 DC Sweep of Global Parameter r

36 36 Parametric Sweep

37 37 Simulation settings

38 38 DC-Sweep + Parametric Sweep

39 39 Transient (Time Domain)

40 40 R eq = R 1 R 2 = 500Ω τ = R eq C = 0.5us t r 2.2τ = 1.1us

41 41 VPULSE

42 42 Transfer of Results Window - > copy to clipboard permits to copy the results to another program (Word, PowerPoint ets.) Table of results in ASCII-codes: copy of corresponding legend