Electrical sources, both as a voltage source or a current source can be classed as being either independentideal or dependent, controlled that is whose value. Section 18 mesh current problems with dependent sources part 4 duration. If the independent source is flipped 180 degrees so that its driving its 1ma current the opposite direction, the dependent current source circuit is. The current of the current source is divided between 2. Dependent sources dont have to rely on other elements values, they can rely on time too. Thevenins theorem circuit containing two independent sources. In other words, the output of a dependent current source is controlled by another voltage or current. Dependent sources are used to model transistors and the operational amplifier ic.
Ltspice mac osx create a circuit with dependent sources youtube. We would like to determine the voltage vc as indicated. The way to remedy this is to write an equation for a loop that doesnt include the current source e. Does circuitlab run on windows, mac os x, and linux. A dependent source is a voltage or current source controlled by either a voltage or a current at the input side of the device model. Ltspice tutorial ep7 dependent voltage and current sources duration. Create a basic dc circuit with a current dependent voltage and current source. In your circuit there is an unknown potential difference across the current source, so your original equation for m2 was incorrect as you ignored this voltage.
In this circuit we have created a current source that outputs the same amount of current as. A dependent source is one whose value depends on some other variable in the circuit. Because vx is the voltage across r2, vx is also equal to vo in circuit b. The circuit has one independent current source and one dependent current source. This seems a bit odd, but this behavior corresponds very closely to the way a number of interesting and useful electronic devices behave. Thevenins theorem circuit w 2 independent sources solved. Sources that are proportional to other currents or voltages in the circuit.
Our previous discussion of ideal voltage and current sources exclusively considered independent sources, which had a fixed specified voltage or current regardless of whatever else was going on in a circuit. Ideal independent current sources are typically used to solve circuit theorems and for circuit analysis techniques for circuits that containing real active elements. For current controlled sources these act like a shortcircuit current measurement in series with the controlling current. Spice2 allows circuits to contain dependent sources characterized by any of the. Just use the g circuit element voltage controlled current source with a lookup table lut specification. Ltspice tips current dependent current source motley. What is the difference between dependent and independent. Signal generators, voltage sources, current sources, and dependent sources. How to simulate a circuit with dependent sources youtube. Current dependent voltage source in ltspice youtube.
About icircuit the realtime circuit simulator and editor. A controlled or dependent current source on the other hand changes its available current depending upon the voltage across, or the current through, some other element connected to the circuit. User manual icircuit the realtime circuit simulator and editor. Electric circuit dependent and independent sources with. Frequently asked questions documentation circuitlab. Dependent sources behave just like independent voltage and current sources, except that the voltage or current depends in some way on another voltage or current in the circuit. Are there any node or component count limits for the schematic editor. Voltage dependent current source in ltspice electrical. The voltage or current values is proportional to some other voltage or current in the circuit. For example, the mac osx version can open these files. The independent current source is and the dependent current source gvx point in the same direction, so you can add these two current sources to get the total current ieq going through the resistor combination r1 and r2. Using a behavioural currentvoltage component bi and bv.
1496 1244 349 466 42 1424 205 1415 49 137 1539 1627 711 1069 1589 442 613 959 258 575 755 119 724 1095 1631 1133 1563 457 1274 1462 1504 609 936 667 710 1418 1172 1411 1296 1469 913 1390 172