Multisim library elements. Multisim program for modeling electronic circuits Multisim 17 where the library of elements is located

Components are the basis of any circuit; these are all the elements that make it up. Multisim operates with two categories of components: real and virtual. It is necessary to clearly understand the differences between them in order to take full advantage of their benefits.

Fig.6 Symbols of various components: 7-segment display, diode D 1, voltage source V 1, NAND gates U 2A, microcontroller U 3 and transistor Q 1.

There are other classifications of components: analog, digital, mixed, animated, interactive, digital multi-select, electromechanical and radio frequency.

The default hotkey for placing a component is Ctrl+W or double-clicking on the panel Real Components / Analog Devices.

Real components, unlike virtual ones, have a specific, unchangeable value and their correspondence on the printed circuit board.

Virtual components are needed only for emulation; the user can assign arbitrary parameters to them. For example, the resistance of a virtual resistor can be arbitrary. Virtual components help developers verify using circuits with known component values. Virtual components may also not correspond to real ones, for example, like a 4-pin element for displaying hexadecimal digits.

Multisim has three levels of databases:

Information can only be read from the Master Database; all components are located in it;

The User Database corresponds to the current computer user. It is designed to store components that you do not want to share;

Corporate Database. Intended for those components that must be accessible to other users over the network.

Database management tools allow you to move components, merge two databases into one, and edit them. All databases are divided into groups, and they, in turn, into families. When the user selects a component and places it in the diagram, a new copy is created. All changes made to it do not in any way affect the information stored in the database.

The Master Database is divided into groups:

1. Sources contains all voltage and current sources, grounding. For example, power sources (DC, AC voltage sources, grounding, wireless connections - VCC, VDD, VSS, VEE), signal voltage sources (rectangular pulse sources, signal source at certain intervals), signal current sources (constant, variable current sources , sources of rectangular pulses)

2. Basic contains basic circuitry elements: resistors, inductive elements, capacitive elements, switches, transformers, relays, connectors, etc.

3. Diodes contains various types of diodes: photodiodes, Schottky diodes, LEDs, etc.

4. Transistors contains various types of transistors: pnp transistors, npn transistors, bipolar transistors, mosfet transistors, cmos transistors, etc.

5. Analog contains all types of amplifiers: operational, differential, inverting, etc.

6. TTL contains elements of transistor-transistor logic.

7. CMOS. Contains CMOS logic elements.

8. MCU Module– multipoint control unit (from the English multipoint control unit)

9. Advanced_Peripherals contains connected external devices (displays, terminals, keypads).

10. Misc Digital contains various digital devices.

11. Mixed contains combined components

12. Indicators contains measuring instruments (voltmeters, ammeters), lamps, etc.

3.1. Signal sources (Power Source Components and Signal Source Components tabs).

Fig.7 Component families sources.

Signal sources mean not only power supplies, but also controlled sources (Table 8).

Table 8.

3.2. Passive elements (Basic tab) – a library that contains all passive components, as well as communication devices.

Rice. 8. Component families passive components.

Rice. 9. Component families diodes.

Rice. 10 Component families transistors.

Table 9.

Source Image	Function
	Resistor (resistance).
	Inductor (inductance).
	Relay (found only in the element library).
	A switch controlled by pressing a specified key (default is space).
	Potentiometer (rheostat). The “Key” parameter determines the symbol of the keyboard key (A by default), when pressed, the resistance decreases by a specified percentage value (the “Increment” parameter, default 5%) or increases by the same amount when pressing the Shift+“Key” keys. The “Setting” parameter sets the initial resistance setting in percentage (default – 50%), the “Resistance” parameter sets the nominal resistance value.
	Capacitor and variable inductor. They act similarly to a potentiometer.
	Capacitor (capacitance).
	Transformer.
	Semiconductor diode (type).
	Zener diode (type).
	LED (type).
	Rectifier bridge (type).
	Shockley diode (type).
	Thyristor or dinistor (type).
	Symmetrical dinistor or diac (type).
	Symmetrical SCR or triac (type).
	Bipolar n-p-n And p-n-p transistors, respectively (type).
	Field effect transistors with control p-n transition (type).
	n- channel with enriched substrate and p-channel with depleted substrate), with separate or connected substrate and source terminals (type).
	Insulated gate MOSFETs ( n- channel with enriched gate and p-channel with depletion gate), with separate or connected outputs of the substrate and source (type).

3.3. Analog elements (Analog tab) – a library in which all amplifiers are collected.

Year/Date of Issue: 2012
Version: 12.0 Build 01/04/2012
Developer: National Instruments
Developer's website: http://www.ni.com/multisim/
Bit capacity: 32bit+64bit
Vista Compatibility: full
Windows 7 compatibility: full
Interface language: English, German + Russian
Tablet: Present
System requirements:- Windows Vista/XP 32-bit.
- Windows Vista 64-bit.
- Windows 7 32-bit and 64-bit

NI Multisim 12- an extremely powerful program for modeling processes and calculating electronic devices based on analog and digital elements. Large selection of virtual generators and oscilloscopes. A special feature of the program is the presence of control and measuring instruments, in appearance and characteristics close to their industrial analogues. The program is easy to learn and quite convenient to use. After drawing up the circuit and simplifying it by designing subcircuits, the simulation begins with the flick of a conventional switch.
National Instruments introduced Multisim 12, the latest version of its circuit design and simulation environment. The easy-to-use Multisim development environment offers a graphical approach that eliminates traditional circuit modeling techniques and provides educators, students and professionals with a powerful tool for circuit evaluation.
Multisim 12 Professional– allows specialists to optimize their own projects, minimize errors and reduce the number of iterations during development. Combined with the new NI Ultiboard 12 PCB layout design software, Multisim provides an end-to-end design platform. Tight integration with the NI LabVIEW graphical development environment allows specialists of various levels to implement their own analysis algorithms and improve the verification of their projects.
Many universities and technical colleges have chosen Multisim due to the presence of interactive components, the ability to monitor and obtain data from measuring instruments in the process of circuit simulation, and also due to the ability to measure analog and digital signals.
The key difference between Multisim 12.0 Professional Edition and other modeling environments is comfort and simplicity. The simulation toolset includes customizable NI LabVIEW evaluation routines and conventional SPICE tools.
Multisim 12.0 is the most integrated with LabVIEW for simulating closed-loop analog and digital systems. Thanks to a completely new approach, designers are able to evaluate FPGA digital control logic circuits in parallel with analog circuits (for example, for power devices) before the desktop simulation stage.
Key innovations in Multisim 12:
- Updated database of models (electromechanical models, power converters, switching power supplies for power circuits).
- More than 2000 components from global manufacturers Analog Devices, National Semiconductor, NXP and Phillips.
- Over 90 connectors to facilitate the development of personal hardware solutions.
- System-level simulation of analog and digital circuits saves time.

The capabilities of a circuit modeling system are determined by many factors, including the composition of the elements from which the equivalent circuit is formed.

Sequential execution of commands P lace\ Component... (Ctrl+W) brings up the “Select a Component” panel. Using the Master Library wizard, select the required set of library components from the Database. All components are distributed across several thematic groups and subgroups (Fig. 2.4). First, you should select the name of the group “Group” (for example, “Sources” - sources). Then set the name of the subgroup “Family” (for example, “POWER_SOURCES” - energy sources). The “Component” column will contain a list of elements of this section of the library:

AC POWER – alternating current source;

DC POWER – direct current source;

DGND – digital ground;

GROUND – analog ground;

THREE PHASE DELTA – three-phase source (triangle);

THREE PHASE WYE – three-phase source (star),

and others.

Fig.2.4. Part of the diagram element selection window

Each position with the name of an element (for example, a semiconductor diode) contains many specific devices produced by different companies and differing in parameter values.

Along with the “Sources” sources, when modeling electrical circuits, the basic elements of the “Basic” group are used (Fig. 2.5).

Fig.2.5. Group of basic elements

The group includes various types of resistors, capacitors, inductors, transformers, switches and other elements. Along with industrial elements, the library contains virtual components, the parameters of which can be set by the user within the framework of a mathematical description. The selected element has by default some initial set of typical parameters. Virtual elements are distinguished by a simpler procedure for calling them by clicking the left mouse button on the label of a group of elements and then placing the selected component on the work field (see Fig. 2.1).

Each group contains several types of virtual elements. Signal sources “Sources” form two groups (Fig. 2.6).

Fig.2.6. Panels of virtual energy sources ( A) and signals of various shapes ( b)

Along with the energy sources already discussed, there are voltage and current sources that produce signals of various shapes: constant and sinusoidal, sinusoidal and amplitude or frequency modulation, rectangular pulses, exponential pulses, complex shapes with piecewise linear approximation, white noise.

The “Basic” group of elements contains passive circuit components (resistors, capacitors, inductors, transformers) and other elements (Fig. 2.7, A).

Fig.2.7. Panels of virtual elements “Basic” ( A), “Transistors”( b) and “Diodes” ( V)

Groups “Diodes...” (Fig. 2.7, V), “Transistors...” (Fig. 2.7, b), contain semiconductor diodes and transistors of various types: bipolar and field-effect.

A group of various elements “Miscellaneous” (Fig. 2.8, A) contains an analog switch, a quartz resonator, a fuse, a lamp, a DC motor, an optocoupler, digital indicators, a timer and other elements. Group of measuring and indicator devices “Measurement C...” (Fig. 2.8, b) is represented by a set of multi-colored LEDs and universal digital ammeters and voltmeters with different orientations on the working field.

Fig.2.8. Panels of virtual different elements ( A), indicators and meters ( b)

There are also groups of operational amplifiers, digital logic gates and microcircuits. To illustrate the “assembly” of circuits using “real” elements, their three-dimensional images are included in the library (Fig. 2.9).

Fig.2.9. Panel showing virtual elements

Information about the selected library element (models, characteristics, parameters and examples of use) can be obtained using Quick Help.

To do this, place the element on the working field:

open the corresponding panel by left-clicking;

select the required element by left-clicking;

use the cursor to place it in the specified area of ​​the field.

If the element is already on the working field, then it must be selected by clicking the left mouse button (in this case, the borders of the element will be marked with black squares). Call up the action panel with the image of the element by right-clicking the mouse and on it, clicking the left mouse button to select the “Help” command. The “Msmapp” panel of contextual help in English will open (Fig. 2.10).

Fig.2.10. Contextual help about diode characteristics

From the list above, select the required help section (for example, static characteristics of a semiconductor diode) and read them or print them for more detailed study.

Electronics Workbench Multisim 14 is the most famous program for the design, design and simulation of electronic circuits. Multisim combines professional features with an easy-to-use program interface. This is an ideal tool not only for educational, but also for industrial production.

Multisim's easy-to-use design environment allows the user to move away from traditional circuit modeling methods and provides a powerful tool for circuit analysis. The utility allows you to optimize your projects, minimize errors and reduce the number of iterations during development. In addition, NI Ultiboard software (printed circuit board layout design) is now included.

A huge selection of ready-made radio elements, diodes, capacitors, transistors, etc. It will help you very quickly simulate the processes occurring in almost any amateur radio design.

Let's start by getting acquainted with the program interface.

Of particular interest to the radio amateur lies in the component panel. It is used to access the database of radioelements. When you click on any of the selected icons, a window opens component selection. On the left side of the window we select the required component.

The entire database of radio-electronic components is divided into sections (passive elements, transistors, microcircuits, etc.), and sections into families ( diodes- zener diodes, LEDs, thyristors, etc.). I hope the meaning is clear.

In addition, in the radio element selection window, you can see the designation of the selected component, a description of its function, and select the type of housing.

Circuit simulation in Multisim

Let's put together a simple circuit and see how it works emulated! I took it as a basis, where I connected LEDs as a load.

If necessary, we can use various virtual measuring instruments, for example an oscilloscope, and look at the signals at any points in the circuit.

Let's assemble a simple electrical circuit, for this we need a (dc-power) constant voltage source and a couple of (resistor) resistances.

Let's say we need to determine the current in the unbranched part of the circuit, the voltage at the first resistance and the power at the second. To do this, we need three virtual measuring instruments, two multimeter and wattmeter. Set the first multimeter to the current measurement mode - ammeter, the other - voltmeter. We connect the current winding of the wattmeter to the second branch - in series, the voltage winding in parallel to the second resistance.

After the virtual circuit is assembled, press the start button and look at the readings of the measuring instruments.

Just in case, we will check the accuracy of the readings from the virtual measuring devices.

As can be seen from the calculations, the virtual readings turned out to be correct.