![]() ![]() Some circuit designers are using only the available transistor model in the library however this will not really give the exact result. The same problem with commercial circuit simulator, if the model is not available you need to build your own model. Building model is not simple for anyone that is first time on it. Supposing you are only utilizing a freeware circuit simulator like LTSpice, still you need to make a model of the transistor if not in the built in model library. The problem with a simulation is that not all the type of transistor is in the library and with available model. You can put a voltage probe across collector-emitter and then run the simulation. By doing simulation you can determine the operation of your circuit. This makes more sense than the first method. How to know if a Transistor is Saturated – Through Simulation However, if you are already in the verification stage of your product development, yes you can do this approach because intentionally you have to build an actual circuit during this stage. You need to buy bread boards, wires and other accessories out there. And aside from the effort and the time spend this approach is also expensive. How about you are just started the project, don’t tell me that you will build an actual circuit then measure the VCE and you do this to all the circuits that has BJT in your project? This will have no sense. Figure below is the setup on how to measure the collector-emitter voltage of a transistor in circuit. Transistors are having saturation voltage range from 0.7V and below but for a circuit designed for hard saturation, the VCE will be lower. If the reading is below 0.3V, the transistor is at saturation. Monitor the collector-emitter voltage of your circuit with a DMM. You can conclude the operation of a transistor if it is saturated or not by doing actual measurement. How to know if a Transistor is Saturated – Through Actual Testing In this article I will share to you the methods or ways on how to know if a transistor is saturated or not. Setting into active region also demands effort and analysis. Likewise, when using a transistor to be operated as a linear circuit or amplifier, the operation must be set within the active region. You need to do some computation, measurements or simulations so that the chosen circuit values are indeed able to saturate the transistor. However operating at saturation is not that easy. Operation at cutoff is simply interrupting the bias of the transistor. It is very important that if you design a transistor to function as a switch that it should operate in the saturation and cutoff. There are several ways how to know if a transistor is saturated or not. ![]()
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