CHAPTER 3: MULTISIM 3.1 INTRODUCTION TO MULTISIM
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1 MULTISIM CHAPTER 3: MULTISIM 3. INTRODUCTION TO MULTISIM Multisim is a virtual electronic circuit design, analysis, and simulation programme that design and analyse analogue, digital and mixed mode circuits on a PC using virtual instruments. Virtual instruments are used to measure circuit behaviour such as voltage, current, power, frequency and signals on a scope. They look just like real instruments without fear of damaging the circuit components or the instruments. The basic virtual instruments in Multisim are: a) Multimeter It measures resistance, ac/dc voltage and ac/dc current. b) Function Generator It produces sinewave, squarewave and triangular wave signals of adjustable frequencies and amplitudes. c) Wattmeter It measures the power in watts consumed in a circuit. d) Oscilloscopes (2-ch and 4-ch). They display the traces of a peak-to-peak voltage signal in a circuit. e) Bode Plotter It produces a graph of the circuit s frequency response. It is useful for analysing electronic filter circuits. f) Frequency Counter It measures the frequency of an ac voltage signal. Other virtual instruments in Multisim include a Word Generator, a Logic Analyzer, a Logic Converter, an IV Analyzer, a Distortion Analyzer, a Spectrum Analyzer, a Network Analyzer, a virtual Agilent Function Generator, Multimeter, and Oscilloscope.
2 Types of electronic components that are available to build circuits in Multisim are: a) DC and AC power sources, single phase and three phase b) Resistors, resistor packs, potentiometers c) Capacitors, single value and variable d) Inductors, single value and variable e) Switches, Connectors, Relays, Motors, Solenoids, Timers f) Transformers g) Diodes, LEDs, Zener h) Transistors, NPN, PNP, JFET, MOSFET Operational Amplifiers, A-to-D and D-to- A Converters i) IC chips, 74 TTL series, 4 CMOS series j) Lamps, LED indicators, Bar graphs k) Voltage Regulators, Transducers, Crystals, Vacuum tubes, Fuses l) And many more components in component libraries
3 3.2 INTRODUCTION TO MULTISIM INTERFACE Multisim user's interface is shown below: Figure : Multisim user's interface 3.2. Design Bar The design bar is central components of Multisim that guides user go through building, simulating, analysing and exporting design. The Component design button is selected by default. The Component Editing allows user to add or modify the components in Multisim. The Instrument design button is selected by default. The Simulate button runs/stops/pauses the simulation. The green sine wave line moves while the simulation is running.
4 The Analysis button allows user to choose the type of circuit analysis. The Postprocessor allows user to perform further operation on the simulation results. The VHDL/Verilog HDL button allows user to work with VHDL modelling. The Report button allows user to print the reports about circuit. The Transfer button allows user to communicate with and convert to PCB layout programme Controlling Circuit Display Figure 2: Controlling Circuit Display
5 3.2.3 Components Toolbar Figure 3: Components Toolbar 3.3 PLACING COMPONENTS 3.3. Placing a Battery Step : Place a Battery. To place the first component (a 5 volt battery): Place the cursor on the Sources Parts Bin button and click. The contents of the Sources Parts Bin appear:
6 2. Click on the DC Voltage Source button and move your cursor to the circuit window. Your cursor changes to indicate a part is ready to be placed. 3. Move to the top left corner of the circuit window to place the battery. Click in this general area or, to be more precise, use the page borders as a guide and click in the intersection of row A and column. The battery appears on your circuit window: Step 2: Change the Battery s Value By default, the battery is a 2V battery, but our circuit calls for a 5V battery. To change the battery s value:. Double-click on the battery. The battery s properties screen appears, with the Value tab displayed. 2. Change the 2 to a 5 and click OK.
7 3.3.2 Placing a Resistor Step : Place a Resistor To place the first resistor:. Place your cursor on the Basic Parts Bin button and, from the toolbar that appears, click the Resistor button. The Component Browser screen appears: 2. Scroll through the Component List to find the ohm resistor we need for our circuit. 3. Select the ohm resistor and click OK or double click on the component value. The cursor will appear on the circuit window as a ghost image of the resistor. 4. Move your cursor to approximately A5 and click to place the component.
8 Step 2: Rotate the Resistor The resistor needs to be rotated in order to set up conveniently into a circuit.. Right-click on the resistor. A pop-up menu appears. 2. Choose 9 Counter CW from the menu. The results look like this: 3.4 EDITING A BASIC SCHEMATIC WITH MULTISIM. Click Tools Edit Components 2. From the Database Name list, the database of the component that needs to be edited can be chose. 3. From the Family Name list, the family of the component that needs to be edited can be chose. 4. From the Component Name list, the component that needs to be edited can be chose. 5. To edit, click Edit (to cancel, click Exit).
9 3.5 VIRTUAL COMPONENTS The instrument toolbar is displayed by default. To choose any of the virtual components, click the Instruments button. 3.6 LOGIC GATES AND COMBINATIONAL CIRCUITS A combinational circuit consists of logic gates whose outputs at any time are determined from the present combination of inputs. A combinational circuit performs an operation that can be specified logically by a set of Boolean functions. A combinational circuit comprises of input variables, logic gates and output variables The Inverter Operation: When the input is LOW, The output is HIGH; when the input is HIGH, the output is LOW, thereby producing an inverted output pulse. A Symbol: Truth Table: Y INPUT (A) OUTPUT (Y)
10 3.6.2 The AND Gate Operation: For a 2-input AND gate, output Y is HIGH if both input A and B are HIGH; Y is LOW if either A or B is LOW, or both A and B are LOW. Symbol: A B Y Truth Table: INPUT (A) INPUT (B) OUTPUT (Y) The OR Gate Operation: For a 2-input OR gate, output Y is HIGH if either input A or B is HIGH, or if both A and B are HIGH; Y is LOW if both A and B are LOW. Symbols: A B Truth Table: INPUT (A) Y INPUT (B) OUTPUT (Y) The NAND gate Operation: For a 2-input NAND gate, output Y is LOW if input A and B are HIGH; Y is HIGH if either A or B are LOW, or if both A and B are LOW. Symbols: A B Y
11 Truth Table: INPUT (A) INPUT (B) The NOR Gate OUTPUT (Y) Operation: For a 2-input NOR gate, output Y is LOW if either input A or B is HIGH, or if both A and B are HIGH; Y is HIGH if both A and B are LOW. A B Y Symbols: Truth Table: INPUT (A) INPUT (B) OUTPUT (Y) The XOR Gate Operation: For an exclusive-or gate, output Y is HIGH if input A is LOW and input B is HIGH, or if input A is HIGH and input B is LOW; Y is LOW if A and B are both HIGH or both LOW. A B Y Symbols: Truth Table: INPUT (A) INPUT (B) OUTPUT (Y)
12 3.6.7 The XNOR Gate Operation: For an exclusive-nor gate, output Y is LOW if input A is LOW and input B is HIGH, or if input A is HIGH and input B is LOW; Y is HIGH if A and B are both HIGH or both LOW. Symbols: A B Y Truth Table: INPUT (A) INPUT (B) OUTPUT (Y) 3.7 Basic Combinational Logic Circuits 3.7. AND-OR Logic For a 4-input AND-OR logic circuit, the output X is high () if both input A and B are high (), or both input C and D are high ().
13 3.7.2 AND-OR-Invert Logic For a 4-input AND-OR-Invert logic circuit, the output X is LOW () if both input A and input B are HIGH () or both input C and input D are HIGH () Exclusive-OR Logic Exclusive-NOR Logic
14 3.8 Functions of Combinational Logic 3.8. Multiplexer A multiplexer is a device that allows digital information from several sources to be routed onto a single line for transmission over that line to a common destination. The basic multiplexer has several data-input lines and a single output lines. Below is the logic symbol for a 4-input multiplexer (MUX). There are two dataselect lines because with two select bits, any one of four data-input lines can be selected. A 2-bit code on the data-select (S) input will allow the data on the selected data input to pass through to the data output as table below: Data-select Inputs Input selected S S D D D2 D3 The data output is equal to the state of the selected data input The total expression for the data output is Y = DS S + DS S + D2SS + D3SS
15 This can be implemented by the circuit below: Because the data can be selected from any one of the input lines, this circuit is also referred to as a data selector The select bits of multiplexer depend on the data input, 2n Demultiplexer The DEMUX is a reverse multiplexer function. It takes digital information from one line and distributes it to a given number of output lines. It is known as data distributors. Below is the -line-to-4-line demultiplexer circuit. The data input line goes to all of the AND gates.
16 The two data-select lines enable only one gate at a time and the data appearing on the data-input online will pass through the selected gate to the associated data-output line Decoder A decoder is a logic circuit that accepts a set of inputs that represents a binary number and activates only the output that corresponds to that input number. An AND gate can be used as a basic decoding element because it produces a HIGH output only when all inputs are HIGH. As example, to decode a binary number,, make sure that all the inputs to the AND gate are HIGH: If a NAND gate is used in place of AND gate, a LOW output will indicate the presence of the proper binary code Below is the diagram of a general decoder with N inputs and M outputs: Decoder N inputs M outputs 2N input codes only one output is high for each input code Since each of the N inputs can be either or, there are 2N possible input combinations or codes. For each of these input combinations only one of the M outputs will be active (HIGH); all other outputs are LOW. In order to decode all possible combinations of 4-bits, 6 decoding gates are required (24 = 6). This type of decoder is called a 4-line-to-6-line decoder (because there 4 inputs and 6 outputs) or a -of-6-decoder (because for any given code on the inputs, one of the 6 is activated).
17 An AND gate can be used to produce active-high outputs and NAND gate to produce active-low output. Below is the logic symbol for a 4-line-to6-line decoder with active-low output. The BIN/DEC label indicates that a binary input makes the corresponding decimal output active. The input labels 8,4,2, represent the binary weights of the input bits. Some decoders have one or more ENABLE inputs that are used to control the operation of the decoder. With the ENABLE line held HIGH, the decoder will function normally. With ENABLE held LOW, all the outputs will be forced to the LOW state regardless of the levels at the inputs. Thus, the decoder is enabled only if ENABLE is HIGH BCD to- Decimal Decoder The BCD-to-decimal decoder converts each BCD code into one of the position decimal digit indications. This decoder also is preferred as a 4-line-to--line decoder or a -of--line decoder.
18 Only decoding gates are required because the BCD code represent only decimal digits, -9. For input combinations that are invalid BCD, none of the output will be activated. The BCD-to-7-Segment Decoder- accepts the BCD code on its input and provides outputs to drive-7-segment display devices to produce a decimal readout Encoder An encoder accepts an active level on one of its inputs representing a digit, such as decimal or octal digit, and converts it to a coded output, such as BCD or binary The process of converting from familiar symbols or numbers to a coded format is called encoding The Decimal-to-BCD Encoder This type of encoder has inputs- one for each decimal digit- and four output corresponding to the BCD code as below:
19 This is -line-to-4-line encoder Decimal Numbers BCD A 3 A 2 A A Refer to the table above, the MSB of BCD code; A 3 is always a for decimal digit 8 or 9. An OR expression for bit A3 in terms of decimal digits: A 3 = Bit A 2 is always for decimal digit 4, 5, 6, 7 and can be expressed as an OR functions as: A 2 = A = A = To implement the logic circuitry required to encoding each decimal digit to a BCD code as follows: When HIGH appears on one of the decimal digit input lines, the appropriate levels occur on the four BCD output lines.
20 As example, if line 9 is HIGH this condition will produce a HIGH on outputs A and A3 and LOW on outputs A and A2, which is the BCD code () for decimal Edge-Triggered Flip-flop An Edge-Triggered Flip-flop changes state either at the POSITIVE edge (rising edge) or the NEGATIVE edge (falling edge) of the clock pulse. In this section, 3 types of Edge Triggered Flip-flop: S-R, D and J-K are covered. Top : Positive edge triggered flip-flop Bottom : Negative edge triggered flip-flop The key to identify an edge triggered flip-flop is the triangle inside the block at the clock C input. This triangle is called the Dynamic Input Indicator Edge Triggered S-R Flip Flop Excitation Table Input S Input R Input CLK Output Q NC X Comments No Change RESET SET Invalid
21 Timing Diagram Edge Triggered D Flip Flop Excitation Table Input D Input CLK Output Q Comments SET RESET Q follows D at the triggering clock edge. Timing Diagram Edge Triggered J-K Flip Flop Excitation Table Input J Input K Input CLK Output Q NC Q Comments No Change RESET SET Toggle. Q is the prior output before clock transition.
22 Toggle Operation When both inputs are HIGH, the output changes to the opposite state on each successive clock spike (J=, K=, Q= and repetitively). A J-K flip-flop connected for toggle operation is sometimes called T flip-flop. The functioning of J-K flip-flop is similar to S-R flip-flop except that J-K has no invalid state. Timing Diagram
23 LAB 3: COMBINATIONAL LOGIC CIRCUIT. Objectives At the end of this lab session, you should be able to: explain the logic gates and combinational circuits. construct combinational circuit in Multisim by using Logic Converter. design a combinational circuit in Multisim. 2. Logic Tools in Multisim Logic Converter button Figure L3- One of the virtual instruments in Multisim is the Logic Converter. The arrow in the figure L3- above shows the Logic Converter button.
24 Logic Converter Figure L3-2 When the Logic Converter button is clicked, the logic converter symbol is shown in the figure L3-2 above.
25 Figure L3-3 In the logic converter, most of the logic conversions needed is there. For example, if we want to obtain a circuit for the following Boolean expression, X A BC AB C Firstly, enter the Boolean expression into the logic converter as below:
26 Then, click on the Boolean expression truth table conversions option: Truth table Truth table conversion Next, the Boolean expression can be simplified by clicking for this example, the Boolean expression cannot be simplified anymore). (Note that Finally, click L3-4 below. to generate the combinational circuit which shown in figure
27 Figure L3-4 Circuit is generated 3. Exercise. Construct a three-input combinational circuit for f = m (2, 4, 5, 7) with the aid of Multisim. Show and explain all the steps in details. 2. Design a four-input combinational circuit for f = m (, 2, 4, 6, 9, 2, 4) with the aid of Multisim. Show and explain all the steps in details. 3. AB represents a two-bit binary number that can have any value (,,, or ); for example, when A = and B =, the binary number is, and so on. Similarly, CD represents another two-bit binary number. Design a logic circuit, using A, B, C, and D inputs, whose output will be HIGH whenever two binary numbers AB are equal and greater than CD. It is impossible for inputs AB and CD to be HIGH at the same time. a) Draw the logic circuit from the simplified Boolean expression (use AND, OR and NOT gates). b) Draw the logic circuit from the simplified Boolean expression (use NAND gates).
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