This tutorial introduces the dependent source elements in pspice. Pspice simulates the circuit, and calculates its electrical characteristics. For the voltage source use vac from the sources library hit the esc key. The current value of the supply is then used to write another equation relating the currents of the two loops. Nodal analysis circuit with dependent voltage source. Creating dependent sources in pspice all about circuits. Source controlled multiple controlling sources current source. The pcb tool is quite good, though it has a huge learning curve. I have a voltage source, say vs, that will be used as a supply voltage for the circuit. Frequency dependent current source pcb design cadence. An quick examination of the curves reveals this is the case.
Capture and currentdependent current source all about. Analog design and simulation using orcad capture and. For the love of physics walter lewin may 16, 2011 duration. Now, you should be able to change any value you want. There are several voltage sources as well as current sources encountered in our daily life. I am wondering if there is a way to do the following. There are also some current sources encountered in our everyday life, such as photo electric cells, metadyne generator etc. How to implement dependent sources in orcad pspice youtube. Ideal dependent independent voltage current source.
In the theory of electrical networks, a dependent source is a voltage source or a current source whose value depends on a voltage or current elsewhere in the network. Put it in series with the resistor its effective input impedance is zero so it doesnt perturb the circuit. I am trying to make a circuit that uses a voltage controlled voltage source i believe, but the image that pspice wants me to use is not what i have written down on the drawn one. A current source that depends on a current input is generally referred too as a current controlled current source or cccs. Resistor r b and capacitor c b form a b1 2015 oxford university press reprinting or distribution, electronically or otherwise, without the express written consent of oxford university press is prohibited. Well describe each of these briefly through a couple of. Voltage sources, in addition to being used for circuit excitation, are the ammeters for spice, that is, zero valued voltage sources may be inserted into the circuit for the purpose of measuring current. Introduction simulation program for integrated circuits e. Analog design and simulation using orcad capture and pspice, second edition provides stepbystep instructions on how to use the cadenceorcad family of electronic.
So you need to break the wire coming out of the positive terminal of v1, send it into the tail of the current arrow on the cccs, and then send the current coming out of the head of the current arrow back to the other side of the break you made. As a result, any changes to the if, vcc or rl will lead to a change in ctr, tr and capacitance cint. Used with orcad capture for design entry, you can think of pspice as a software based breadboard of your circuit that you can use to test and refine your design before ever touching a piece of hardware. Mesh current method with dependent sources physics forums. To do an ac analysis, a nonzero value of ac must be. Input bias current ib and input offset current ios. In the theory of electrical networks, a dependent source is a voltage source or a current source whose value depends on a voltage or current elsewhere in the network dependent sources are useful, for example, in modelling the behavior of amplifiers. How to implement dependent sources in orcad pspice. Explain some issues that arise when connecting these parts in the schematics layout tool in pspice. Using pspice for circuits with dependent sources the problems in this tutorial and the corresponding homework continue to deal with the dc analysis of circuits, or dc bias analysis in pspice. Orcad pspice is a simulation program that models the behavior of a circuit containing analog devices. Analog design and simulation using orcad capture and pspice provides stepbystep instructions on how to use the cadenceorcad family of electronic design automation software for analog design and simulation. And pspice is a product of the orcad corporation and the student version we are using is.
Gsrc voltagecontrolled current source model online. The software is used mainly by electronic design engineers and electronic technicians to create electronic schematics, perform mixedsignal simulation and electronic prints for manufacturing printed circuit boards. Dec 28, 2014 this video shows how to implement dependent sources in pspice software. The tutorial starts under the assumption that the demo version of pspice is installed on your computer. For purely linear dependent voltage sources, the output should be a linear function of the input voltage. The sources can be categorized into two different types independent source and dependent. Users can use the new digital electronics and data convertors chapters with working examples that have been added to the basic electronics book in learning pspice.
So you need to connect that line to the current controller the square thing attached to the current source, basically running a wire from the voltage source to one end of the controller, then running the other end of the controller to the 10ohm resistor deleting the connection between the resistor and the source so that they only connect. Model library pspice model library includes parameterized models such as bjts, jfets, mosfets, igbts, scrs, discretes, operational amplifiers, optocouplers, regulators, and pwm controllers from various ic vendors. We will be using the same circuit but will evaluate the effect of sweeping the voltage source between 0 and 20v. You can put a switch in series to break a voltage but if you put it in series with an ideal current source, the current will still manage to get through the switch even if it is 1g ohm. The currentcontrolled current source actually implements two individual devices, as can be seen from the netlist template. There will be a short delay while the software is loaded and the licence server is accessed. So if there was 1 mv between net 7 and net 9 then the voltage on net 3 would be 100 mv higher than net 5. This source produces a current at the output terminals that is a linear function of the current at the input terminals, dependant on the gain of the source. Using pspice for circuits with dependent sources csun. Help in plugging equation in arbritrary current source ltspice. Cadence pspice technology offers more than 33,000 models covering various types of. A bipolar junction transistor can be modelled as a dependent current source whose magnitude depends on the magnitude of the current fed into its. Orcad pspice the handling procedure of circuit designing.
Hello, i was wondering how to change the values of a dependent source in pspice 9. So when i do a ac sweep simulation with pspice, the amplitude of the ac current source should sweep together with the frequency. The first is a 0v voltage source, which acts as an ammeter, to. Pspice voltagedependent, voltage source eeweb community. Ctrlclick to access the advanced properties page for the fet. The four types of dependent sources are listed below in table 1 along with their abbreviation, pspice name and library.
Eldridge alcantara winter 2009 updated fall 2009 1 overview. Users can take advantage of the 5 levels of speed upgrades with the default set at a level 3, speed level should be set at 0 for compatibility with previous releases. I have a problem with that currentdependent current source. Orcad has its learning curve, but it might just be the best bang for the buck, particularly for schematic entry. L and w are channel length and width in meters, ad and as are area of drain and source in square meters. The current controlled current source actually implements two individual devices, as can be seen from the netlist template. Another option to consider is the mentor tools, particularly for pcbs. Pspice dependent sources electronic circuits electrical. The orcad pspice simulator from cadence allows you to build circuit models for your design and analyze their behavior using a graphical. Frequency dependent current source cadence community. A polynomial or piecewiselineair source is what is commonly available in circuit simulators. For example, say i have a dependent current source that depends on the current flowing through some resistor and say that the current flowing through this dependent source is 2i.
Nortons theorem with dependent source in hindi duration. I do not have multisim but in spice 3 that can be modeled with a linear independent voltage source v1 set to 0 and a nonlinear dependent source b. Multisim component reference guide january 2007 374485a01 componentref. The goal with modeling a design for a dependent current source is to create a graph showing the output voltage vs. Ltspice tutorial ep7 dependent voltage and current sources. However, the voltage source value is proportional to two other signals in the circuit two net voltage in the circuit, say net a and net b. To be exact, the amplitude of the ac current source should have the form f. Multisim component reference guide national instruments. Download orcad free trial now to have a full evaluation of all orcad tools with no functionality limitations. Now, you will be shown a window with only the dependent source. To the right are some graphs from the ps2501 data sheet for reference.
Fsrc currentcontrolled current source model online. Place the resistors, capacitor, and the inductor from the analog library. I am simulating analog circuits using orcad capture light 9. Organized into 22 chapters, each with exercises at the end, it explains how to start capture and set up the project type and libraries. The positive side of the controlling source is net 7 and the negative terminal of the reference voltage is net 9. An3005 modeling phototransistor optocouplers using pspice.
I have not seen any circuit simulator and ive used many that will let you define your currentsource with complex formulas like these. Dependent sources type of source acronym symbol in text part name in pspice symbol in. I would like to implement a frequency dependet ac current source in orcad capture. The following general pspice model form is supported. The dc analysis calculates the circuits bias point over a range of values when sweeping a voltage or current source, temperature, a global parameter, or a model parameter. Since we want to plot the voltage and current versus time, the transient analysis is used. Then the output is dependent on this based on the transfer parameter of the specific dependent source. Dec 09, 2010 a dependent source is a 4terminal component. Pspice schematic probes are placed in the circuit to measure the voltage across the resistor and the current through the inductor. This tutorial will teach you all you need to know about pspice for ece 65.
Orcad systems corporation was a software company that made orcad, a proprietary software tool suite used primarily for electronic design automation eda. This tutorial introduces the dependent source elements in. This video shows how to implement dependent sources in pspice software. Hello, i am extremely new to circuits and circuit simulation software. Current dependent voltage source in ltspice duration. Orcad free trialorcad trial provides full version of the latest release of orcad electronic design software solutions for free for a limited time, including orcad capture cis, orcad pspice designer, orcad pcb designer professional, orcad sigrity erc, and more.
May i ask you how to connect that cccs to the rest of the circuit. As discussed in class there are four types of dependent sources, two are voltage sources. Jan 12, 2018 hello, im trying to simulate the following circuit. An3005 modeling phototransistor optocouplers using pspice simulation. So far we have covered circuits with resistors and independent sources.
It contains one dependent voltage source, two independent voltage sources, two independent current sources and some resistors. If we need a graphical output, pspice can transfer its data to the probe program for graphing purposes. Close the edit part window and choose update current or update all. Getting started start the orcad schematic capture program start programs orcad 15. Create a new new simulation profile from the pspice menu. The dependent causes two nodes to form a supernode. You need the current io to go through the control side of the cccs the same way that you would use an ammeter. Batteries, dc generator or alternator all are very common examples of voltage source. Also pspice is a simulation program that models the behavior of a circuit. Adjustable lm317 high powered current source duration. Analog design and simulation using orcad capture and pspice.
The following general pspice model forms are supported. Objective of lecture introduce the parts in pspice for dependent voltage and current sources. I have a problem with that current dependent current source. As discussed in class there are four types of dependent sources, two are voltage sources and two are current sources. The currentcontrolled dependent voltage source as shown above, produces a voltage proportional to the current, i x, in a different branch of the network. Free app to enable quick and accurate creation of orcad pspice parts directly on the orcad capture schematic using a wizardstyle interface. Multisim need help with placing current dependent current source. Independent and dependent voltage source problems in.
Capture and currentdependent current source all about circuits. Describe how to set the part properties to set the coefficient a for the dependent source. The circuit time constant defines the ratio lr, where l and r are the effective circuit inductance and resistance components in. Generally, an ideal current dependent source, either voltage or current controlled is designated by a diamondshaped symbol where an arrow indicates the direction of the current, i as shown. However, the voltage source value is proportional to two other signals in the circuit two net voltage in the circuit, say net a and net b with the voltage. This model is certainly suitable to model most positive current providing sources, and also some sources without active shunt regulation at the output, it will be converted into a circuit model voilim, denoting a current source limiting device. Hello, im trying to simulate the following circuit. An annoying problem in pspice is the inability to change some properties of the part. Circuit elements and models university of california, berkeley. A transient analysis with the uic option shows a sine wave at about 7 khz in the circuit listed below. I os where i b and i os are, respectively, the input bias current and the input offset current specified by the opamp manufacturer. Independent and dependent voltage source problems in simulations. If you are depending on current, its the current flowing through the input terminals.
494 586 898 480 57 1016 504 318 840 1098 120 1341 1302 1433 166 676 807 471 1454 158 27 1482 610 1402 173 241 1496 760 1276 500 874 564 900 663 1460 403 1394 789 1412 192 1379 426 170 195