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ni.com B. What is NI Multisim? Capture Simulate Analysis Unified environment for teaching circuit theory and design through capture and simulation ni.com 2 B. The NI Multisim Environment ni.com 3 • Menu items, system/design toolbars • Resizable workspace area • Component tool bar • Design Toolbox • Status Indicator B. Exercise 1 – Start Multisim and Get Familiarize Approximate time to complete: 2 minutes ni.com 4 C. Simulation in Multisim • • There is no need to be a SPICE expert Multisim makes simulation easy Method 1 – Interactive SPICE Simulation Method 2 – SPICE Analyses MCU Simulation Options Stop Simulation Pause Simulation Start Simulation Simulation Toolbar Interactive Simulation Status ni.com 5 C. Simulation Method 1: Interactive Simulation • • • Over 20 instruments are the fastest and easiest way to measure results Connect to your circuits just like real equipment Double-click the schematic symbol to open the front panel Instruments Toolbar Schematic Symbol Multimeter Function Generator Oscilloscope Bode Analyzer Logic Analyzer Measurement Probe LabVIEW Based Instruments Current Probe ni.com Front Panel 6 B. Component Selection | Component Toolbar • • • • • • • • ni.com • Sources Basic Diodes Transistors Analog TTL CMOS Miscellaneous Digital • • • • • • 7 Mixed Signal Indicators Miscellaneous Electromechanical RF Hierarchical blocks Bus B. Component Selection | Component Browser Ctrl+W or select from toolbar Categorized by: 1. Database 2. Group 3. Family 4. Component ni.com 8 ni.com 9 Rotating ni.com 10 B. Wiring Components There are 2 main methods for wiring circuits: 1. Click on source, then destination terminals 2. Drop components directly onto wires or terminals Cursor Mode Place or Move Part Select Menu Item or Icon Place Wire Re-wire ni.com 11 B. Grounding • • • • The concept of “ground” is a way of defining a point common to all voltages. It represents 0 volts. In power systems, the planet Earth itself is used for this reference point (most home power circuits are ultimately “grounded” to the earth's surface for lightning protection). Multisim supports a multipoint grounding system. Each ground is connected directly to the ground plane. Not all circuits require grounding for simulation. However, any circuit that uses an opamp, transformer, controlled source or oscilloscope must be grounded. Also, any circuit which contains both analog and digital components should be grounded. If a circuit is ungrounded or improperly grounded (even if it does not need grounding in reality), it may not be simulated. If it is simulated, it may produce inconsistent results. The linear transformer must be grounded on both sides. ni.com 12 • Changing names of the circuit elements • Changing values of the circuit elements • Wire-color • Ground • Probes ( Voltage – Current ) • Multimeters ( Voltage – Current ) ni.com 13 C. Method 1 - Measurement Probes • • • Attach to any wire in the circuit and can be named Measures circuit properties (including differential voltages) Also visible as an output from analysesProperties Dialog Toolbar Icon ni.com Schematic Symbol 14 Ohm’s Law ni.com 15 C. Method 1 - Multimeter • Selections can be changed while simulation is running Toolbar Icon Schematic Symbol Front Panel Instruments can be configured during simulation You can resize the front panels Positive Terminal Negative Terminal ni.com 16 Multimeter - Voltage ni.com 17 Multimeter - Current ni.com 18 X2 = 8V Y2 = 4mA Req = V / I = 8 V / 4 mA = 2 Kohm ni.com 19 Power = I^2 * R ni.com 20 ni.com 21 Exercise 4: Saving ni.com 22 Potentiometer • A potentiometer is a manually adjustable variable resistor with 3 terminals. The potentiometer essentially functions as a variable voltage divider. The resistive element can be seen as two resistors in series(potentiometer resistance), where the wiper position determines the resistance ratio of the first resistor to the second resistor. • ni.com 23 Potentiometer ni.com 24 ni.com 25 POWER • Electric power is the energy consumption in an electrical circuit. The electric power P is I^2*R = I*V P is the electric power in watt (W). I is the current in ampere (A). V is voltage in volt (V). • Total power of system must be equal to zero. • • • • ni.com 26 ni.com 27 ni.com 28 ni.com 29 DIODE • • A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction. When a diode allows current flow, it is forward-biased. When a diode is reverse-biased, it acts as an insulator and does not permit current to flow. ni.com 30 Ideal Diode ni.com – 31 Typical diode Forward - bias ni.com 32 ni.com 33 ni.com 34 ni.com 35 ni.com 36 Reverse - bias ni.com 37 C. Multisim Grapher Pinter friendly Graph ! Multiple tabs Digital Signals Analog Signals • Displays Simulation Results • View, Adjust, Save, Print and export data • Precise cursor measurements (x, y) • Overlay different results to compare ni.com 38 • Save results for use in LabVIEW, Signal Express, Excel, and others • Analog and digital signals F. Training Options Multisim Basics – view available courses Key Objectives: • Learn to capture schematics with an introduction to the features of the Multisim user interface • Use interactive simulation, virtual instruments, and advanced analyses to validate a design • Create custom components to add to your database Ultiboard Basics – view available courses Key Objectives: • Apply automated and manual processes for efficient part and trace placement • Learn to create custom land patterns/footprints to include in the component database • Prepare final designs for manufacture and export to industry-standard file formats ni.com 39 F. Textbooks • • • Circuits by Maharbiz and Ulaby Microelectronic Circuits by Sedra and Smith Principles of Electric Circuits by Floyd Lab Exercises/Manuals • • • • NI myDAQ and Multisim Problems for Circuits by Doering Circuits Laboratory Companion by Ganago and Sleight Problems & Explorations in Microelectronics with NI myDAQ and Multisim by Doering Practical Teaching Ideas by Tracy Shields ni.com 40