After that current can flow between collector and emitter terminals. Is off and when the input is 0, the output is 12 V and the switch is on. When we apply a biasing voltage to the base terminal, the PN junction breaks down. In other words, when the input is 12 V the output is 0 V. The result shows how the input is inverted. 2) Oscilloscope settings: You must use VOLTS/DIV and TIME/DIV. It consists of two PN Junctions coupled back-to-back with a common middle layer. When we want a BJT to be operated as a switch, it must be operated in such a way that the power loss during ON and OFF condition should be nearly zero, or very low. Section 1.1: BJT temporal switching behavior 1) Construct the circuit as shown in Fig-4(a). The Bipolar Junction Transistor or simply BJT is a three-layer, three terminal and two junction semiconductor device. For V i Ve, the NPN transistor will be OFF, therefore start from Vi0. The data plotter will show the required output A Brief Note on BJT There are two main families of Transistors: Bipolar Junction Transistors (BJT) and Field Effect Transistors (FETs). BJT can work in one of the following modes of operation. Set the time analysis settings - time to 10ms and Accuracy to MediumĦ. Set input at 6V and 500Hz Square wave and give an offset of 6V. (transistor in saturation, no more linear relation between IC and IB) NPN Common. As IC rises ,voltage drop across RC increases and VCE drops toward ground. Increasing IB, VBE slowly increases to 0.7V but IC rises exponentially. That the transistor is heavily saturated for a logic-high input signal. Base-Emitter starts to conduct with VBE0.6V,IC flows and it’s ICbIB. While designing the transistor-based switch, you should ensure
It is in the saturation regionįor a logic-high input and acts as a closed switch. When a logiclow input is applied, the transistor is in the cut-off region and acts as an open switch. Logic-low input applied at its base terminal and the output is at logic-low level for a logic-high input. This experiment the transistor is used as an inverting switch that is the transistor output is at logic-high level for a
Aim is to build a circuit with BJT working as a switchĪ major application of transistors is their use as switching devices in computers and other control applications.
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