Seminar on “Circuit Simulation and PCB Design using...
Transcript of Seminar on “Circuit Simulation and PCB Design using...
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Seminar on“Circuit Simulation and PCB Design
using OrCAD”Prof. Anish Goel
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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
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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.
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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.
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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)
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Types of PCB’sSingle Sided PCB and Double Sided PCB
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Electronic System Design Flow
Schematic Design
Circuit Simulation
PCB design
Testing and Verification
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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.
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PSPICE model Cont… Transistor Parameters
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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
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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
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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
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PSPICE simulation
� This can perform :� Transient analysis.� Frequency analysis.� Simulation at different temperatures.
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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.
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Complex PCB Generation from Schematic
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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.
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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:
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� 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.
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Sample Design
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Sample Design cont…
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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.
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� 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.
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Thank you …� This presentation is also available at:
www.discovermechatronics.blogspot.com
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