Or cad

Seminar on“Circuit Simulation and PCB Design

using OrCAD”Prof. Anish Goel

Contents� Basics of Circuits and Components� Concepts of Printed Circuit Boards (PCB’s)� Electronic System Design Flow� Introduction to PSPICE model� Schematic Design� Schematic Design� PSPICE simulation� PCB design using OrCAD� Testing design� Workshop on OrCAD

2 OrCAD of Cir. Sim. and PCB Design ANISH GOEL

Basics of Circuits and Components

� What is a circuit?� Any system that is formed by interconnecting electronic components.

� A system that processes electronic data.� Circuits maybe classified as Analog circuits or digital circuits.� Mixed signal circuit is also possible.� Mixed signal circuit is also possible.


Basics of Circuits and Components Cont…

� What is Component?� Any discrete electronic device that understands electronic Signals.

� Electronic Components are generally made up of metals and semiconductors

� Smaller components may be integrated together to build larger � Smaller components may be integrated together to build larger components.


Printed Circuit Boards� PCB is a platform that is used to place and connect all the components together.

� The board is made out of a insulator/substrate.� Components are placed in the holes of the PCB.� The leads of the components are connected using copper � The leads of the components are connected using copper tracks.

� Printed circuit boards are classified into following:� Single sided PCB (Components on one side and tracks on other side)

� Double sided PCB (Components on one side and tracks on both sides)


Types of PCB’sSingle Sided PCB and Double Sided PCB


Electronic System Design Flow

Schematic Design

Circuit Simulation

PCB design

Testing and Verification


Introduction to PSPICE model

� SPICE: Simulation Program with Integrated Circuit Emphasis.

� PSPICE: Programmable SPICE� It is computer program that help in modeling components and simulating their functionality.

� A SPICE model is a text-description of a circuitcomponent used by the SPICE Simulator tomathematically predict the behavior of that part undervarying conditions.


PSPICE model Cont… Transistor Parameters

OrCAD of Cir. Sim. and PCB Design ANISH GOEL9

Schematic Design

� First step for building a electronic circuit/system.� Schematic is a standard way representation of circuit.� It can be understood by any circuit designer.� It can be modified as per the requirements.� Schematic is used by SPICE for circuit simulation.� Schematic is used by SPICE for circuit simulation.� Same schematic maybe used to design PCB.

V1

FREQ = 50VAMPL = 5VOFF = 0 R1

{rv ar}

0

1 2D2

1N4376


Complex Schematic Design

RTCK

L4L5L6L7L8 L1L2L3

sw2sw1

SDA_MEM

MOSI0

13579

1113151719

2468101214161820

J1

CONNECTOR EDGE 10x2

P1.1616

P1.1712

P1.188

P1.194

P1.2048

P1.2144

P1.2240

P1.2336

P1.2432

P1.2528

P1.26/RTCK24

P1.27/TDO64

P1.28/TDI60

P1.29/TCK56

P1.30/TMS52

P1.31/TRST20

RCTX135

P0.0/TXD019

P0.1/RXD021

P0.2/SCL022

P0.3/SDA026

P0.4/SCK027

P0.5/MISO029

P0.6/MOSI030

P0.7/SSEL031

P0.8/TXD133

P0.9/RXD134

P0.10/RTS135

P0.11/SCL137

P0.1238

P0.1339

P0.14/SDA141

P0.1545

P0.164647

U1

LPC2148 D

SCL_MEM

MISO0

AD1.5

0

C1

CAP

C2

CAP

C3

CAP

C4

CAP

A01

A12

A23

GND

4

SDA5

SCL6

WP7

VCC

8U3

AT24C01A

GND

15

VCC16

R1IN13

R2IN8

T2IN10

T1IN11

C1+1

C1-3

C2+4

C2-5

R1OUT12

R2OUT9

T1OUT14

T2OUT7

V+2

V-6

U2

MAX3232

0

SCK0

0

TXD0

594837261

P1

CONNECTOR DB9

594837261

P2

CONNECTOR DB9

R/W

VCC

RXD0

00

AD1.3

TCK

0

0

TRST

ENEN

0

TDI

0

AD1.4

VCC

TMS

D1

LED

D2

LED

D3

LED

VCC

TMSTRST

RTCKTDOTDITCK

D4

LED

D5

LED

D6

LED

D7

LED

VCC

D8

LED

TXD0

TDO

RXD0

LPC2148 D.K.

1 4

2 3

SW8RST_ISP

VCC

0

TXD1RS

RXD1

SDA_MEM

L4L1 L8L5L2 L6L3 L7

123456

J10

Analog I/P

R/W

AD1.0

1234

J5

I2C

C11

100N

TXD1

AD1.3

L3L2L1

L8L7L6L5L4

RXD1

R6

10K 0

R7

10K

VCC

R8

10K

0

VCC

sw[1:6]

AD1.4

R9

10K

VCC_BAR

123456

J6

SPI0

SCL_MEM

AD1.5

12

J2

HEADER 2

0SDA_MEM

123456789

R131K

R4

2K

AD1.7

R23RESISTOR

12345678910111213141516

J3HEADER 16

R5

2K

VCC_BAR

VCC

R12

10K

VCC

AD0.7

J8

VCC_BAR

SSEL0


VCC

CS2

Din3

VSS14

VDD5

CLK/SCLK6

VSS27

Dout8

NC9

DET110

NC1

DET211

U5

MMC/SD

sw6sw5sw4sw3sw2

0

RCTX1RCTX2

5

VDD323

VDD343

VDD351

VSS16

VSS218

VSS325

VSS442

VSS550

VREF63

VDDa7

VSSA59

P0.16P0.17/SCK1

47

P0.18/MISO153

P0.19/MOSI154

P0.20/SSEL155

P0.211

P0.222

P0.2358

P0.259

USBD+10

USBD-11

P0.2813

P0.2914

P0.3015

P0.31/USBled17

X162

X261

RST57

VBAT49

R151.5K

C1610u

1 234567

R18

10K

Y2

32768

0

C7

39P

C8

39P

0

R24

RESISTOR

VCC

R21

30k

0

0

VCC

VCC

VCC

0

0

123456

J4

HEADER 6

C9

20P

R22RESISTOR

VCC

R17

10K

R1

10K

C10

20PR2

33

1 4

2 3

SW2SWTCH1

0

R333

SSEL0

1 4

2 3

SW3SWTCH2

C2047U

0

1 4

2 3

SW4SWTCH3

sw1

VCC

0

C19CAP

12J9

VREF

123

J11supply

0

1 4

2 3

SW5SWTCH4

0

L1470uH

C15

100n

12

J12

HEADER 2

1 4

2 3

SW6SWTCH5

1 4

2 3

SW1

rst

sw2

0

1

J13

HEADER 1

R271k

IN4

OUT5

GND

3

ADJ1

ON/OFF2

U4

LM2941/TO220

1 4

2 3

SW7SWTCH6

VCC_BAR

0

D9LED

sw3

0

AD1.7

1

J14

HEADER 1

VCC

1

J15

HEADER 1

VCC0

Prof. Anish Goel

D10

BAT54C/SOT

1

J16

HEADER 1

0

R2510K

sw4

D11PW_LED

R2610K

0

12

J7

BAT BACKUP

C5

18P

1

32

Q2BC807

C6

18P

sw5

0 sw6

R16330

RS

0

0

R19RVOLT

0

0

1 2 3

456

SW9ON/OFF

R20RVOLT

R10

10K

0VCC_BAR

VCC

R14

2K

R11

10K

0

AD0.7

C12

100N

C13

100N

Y112MHz

MOSI0

C14

100N

AD1.0

C17CAP NP

C21100u

SCK0

VCC

MISO0

12

J8

BDG_E

PSPICE simulation

� This can perform :� Transient analysis.� Frequency analysis.� Simulation at different temperatures.


PCB design using OrCAD

� No requirement for designing PCB separately.� PCB can be generated from the schematic.� Placement of the components is the next step.� Routing of tracks can be done manually or automatically.� All PCB design rules are taken care by the DRC.� Modifications in PCB can be made by changing the schematic directly.directly.

� The tool generates a .gerb file that can be directly fed to the CNC machine for PCB fabrication.


Complex PCB Generation from Schematic


Testing and Verification� Testing of the circuit is done by applying all the possible combinations of inputs and verifying the expected outputs.

� Fault during testing can be analyzed by looking at the schematic directly.


Targets to the students� Recollect the basic knowledge of these courses:

� Electronic devices and circuit.� Digital Circuits.� Linear electronic circuit.� Microprocessors and interfacing.

For knowledge about electronic components:


� For knowledge about electronic components:� Electronic Engg. Materials and Components.

� Combine all these knowledge to develop circuits like:� Amplifiers and filters (LEC)� Counters and ALU (DC and MuP)� Any other application oriented circuit.

Sample Design


Sample Design cont…


Workshop on OrCAD

� Workshop on OrCAD covers the following topics:� Basic schematic design.� Simulation using PSPICE.� Circuit design for complex circuitry.� Generating netlist file.� Generating PCB from netlist.


� Generating PCB from netlist.� Placing components.� Routing connections.� Generating gerb file by post processor.� Taking films for PCB fabrication.

� Students will be provided with an evaluation version of the software that holds good for 6months to 1 year.

Thank you …� This presentation is also available at:

www.discovermechatronics.blogspot.com


Or cad

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