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  • 1. Seminar on“Circuit Simulation and PCB Design using OrCAD” Prof. Anish Goel
  • 2. Contents Basics of Circuits and Components Concepts of Printed Circuit Boards (PCB’s) Electronic System Design Flow Introduction to PSPICE model Schematic Design PSPICE simulation PCB design using OrCAD Testing design Workshop on OrCAD2 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 3. 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.3 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 4. 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 components.4 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 5. 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 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)5 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 6. Types of PCB’sSingle Sided PCB and Double Sided PCB 6 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 7. Electronic System Design Flow Schematic Design Circuit Simulation PCB design Testing and Verification7 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 8. 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 circuit component used by the SPICE Simulator to mathematically predict the behavior of that part under varying conditions.8 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 9. PSPICE model Cont… Transistor Parameters9 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 10. 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. Same schematic maybe used to design PCB. D2 1 2 1N4376 V1 VOFF = 0 R1 VAMPL = 5 FREQ = 50 {rv ar} 010 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 11. Complex Schematic Design VCC LPC2148 D.K. P2 J2 P1 1 5 1 R13 J3 5 9 2 1K HEADER 16 9 4 4 0 8 0 8 3HEAD ER 2 3 7 U2 7 2 9 8 7 6 5 4 3 2 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 2 6 13 12 RXD0 6 1 8 R1IN R 1OUT 9 1 R2IN R 2OUT RXD1 L8 L7 L6 L5 L4 L3 L2 L1 0 10 14 C ONNECTOR DB9 0 TXD0 T2IN T1OUT /W RS N 11 7 C ONNECTOR DB9 E TXD1 T1IN T2OUT R C1 1 D1 D2 D3 D4 D5 D6 D7 D8 3 C1+ VCC_BAR VCC_BAR VCC _BAR CAP 4 C1- 5 C2+ C2- D R12 C2 2 LE V+ D D D D D D D 6 LE LE LE LE LE LE LE CAP V- ND L1 L2 L3 L4 L5 L6 L7 L8 10K 16 G VCC VCC 5 0 1 VCC C3 C4 MAX3232 J10 C11 CAP CAP VCC AD0.7 6 AD1.7 5 R4 0 4 100N AD1.5 R5 VCC AD1.4 3 2K J5 U3 AD1.3 2 8 U1 2K 4 0 1 AD1.0 VCC L1 16 19 3 1 5 CC L2 P1.16 P0.0/TXD0 TXD0 A0 SDA SDA_MEM 12 21 2 I2C 2 V L3 P1.17 P0.1/RXD0 R XD0 A1 R6 R7 R8 R9 8 22 1 3 Analog I/P L4 4 P1.18 P0.2/SCL0 26 A2 J1 L5 48 P1.19 P0.3/SDA0 27 VCC 0 6 VCC P1.20 P0.4/SCK0 0 SCL_MEM SC L 10K 10K 10K 10K L6 44 29 J6 ND 1 2 L7 40 P1.21 P0.5/MISO0 30 7 G TRST 3 4 L8 36 P1.22 P0.6/MOSI0 31 6 WP R23 TDI 5 6 P1.23 P0.7/SSEL0 SCK0 5 RESISTOR 4 TMS 7 8 32 33 MISO0 4 AT24C 01A R/W P1.24 P0.8/TXD1 TXD1 TCK 9 10 28 34 MOSI0 3 SPI0 1 4 EN P1.25 P0.9/RXD1 R XD1 SDA_MEM RTCK 11 12 RTCK 24 35 SSEL0 2 TDO 13 14 TDO 64 P1.26/RTC K P0.10/RTS1 37 1 0 SW8 TDI P1.27/TDO P0.11/SCL1 SC L_MEM 0 15 16 60 38 RST_ISP TCK P1.28/TDI P0.12 AD 1.3 17 18 56 39 TMS P1.29/TCK P0.13 AD 1.4 2 3 19 20 52 41 TRST P1.30/TMS P0.14/SDA1 SD A_MEM 0 20 45 P1.31/TRST P0.15 AD 1.5 sw[1:6] CON NECTOR EDGE 10x2 3 LPC2148 D 46 sw1 J8 VCC 5 RCTX1 P0.16 47 sw2 Y2 RCTX2 P0.17/SCK1 53 sw3 H EADER 6 sw1 1 4 0 1 23 P0.18/MISO1 54 sw4 R1 2 0 43 VDD3 P0.19/MOSI1 55 sw5 1 SW2 51 VDD3 P0.20/SSEL1 1 sw6 10K 2 SWTCH1 32768 49 VDD3 P0.21 2 3 VBAT P0.22 AD 1.7 2 3 BDG_E R10 R11 58 4 6 P0.23 5 sw2 1 4 10K 10K C9 C 10 18 VSS1 9 6 VCC RS J7 25 VSS2 P0.25 10 R2 R150 SW3 20P 20P 42 VSS3 USBD+ 11 33 1.5K SWTCH2 1 50 VSS4 USBD - 13 R3 VSS5 P0.28 J4 2 3 2 14 C5 C6 33 R18 P0.29 AD 0.7 sw3 1 63 15 4 0 0 0 VREF P0.30 AD 1.0 17 18P 18P VCC 1 2 BAT BACKUP 0 7 P0.31/USBled 62 R14 3 SW4 VCC VDDa X1 R 17 61 4 SWTCH3 59 X2 57 Y1 2K 10K 5 VSSA RST 12MHz 6 2 3 1 7 sw4 1 4 3 J9 2 10K 10u C7 C8 0 1 Q2 SW5 D10 C16 BC807 SWTCH4 VC C VREF VC C C15 1 SW1 4 39P 39P 2 2 3 0 100n sw5 1 4 C 12 C 13 C14 rst D9 SW6 2 3 SWTCH5 LED 100N 100N 100N 0 L1 BAT54C/SOT 0 2 3 470uH 0 sw6 1 4 VC C R22 RESISTOR SW7 0 0 0 R16 J11 SWTCH6 330 supply 2 3 C 19 VC C C AP 3 2 1 0 0 VCC_BAR 0 VC C_BAR C17 U5 U4 CAP NP 1 R21 VCC SSEL0 R24 2 NC 6 5 4 4 5 0 MOSI0 3 CS SW9 30k IN OUT RESISTOR 4 Din J12 ON /OFF 1 C20 5 VSS1 G D AD J VDD N 2 47U SCK0 6 ON/OFF 7 CLK/SCLK 1 1 2 3 MISO0 8 VSS2 3 2 C 21 LM2941/TO220 9 Dout 100u R 19 R20 R25 10 NC VCC DET1 R VOLT RVOLT 10K 11 0 DET2 H EADER 2 VCC R26 10K MMC/SD J13 0 J14 J15 R 27 J16 1k 0 1 0 0 1 1 1 D 11 HEADER 1 PW_LED HEADER 1 HEADER 1 H EADER 1 0 Prof. Anish Goel 11 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 12. PSPICE simulation This can perform : Transient analysis. Frequency analysis. Simulation at different temperatures.12 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 13. 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. The tool generates a .gerb file that can be directly fed to the CNC machine for PCB fabrication.13 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 14. Complex PCB Generation from Schematic14 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 15. 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.15 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 16. 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: 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.16 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 17. Sample Design17 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 18. Sample Design cont…18 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 19. 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. 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.19 OrCAD of Cir. Sim. and PCB Design ANISH GOEL
  • 20. Thank you … This presentation is also available at: www.discovermechatronics.blogspot.com20 OrCAD of Cir. Sim. and PCB Design ANISH GOEL