![]() ![]() When V i goes beyond 0.6 V, the transistor moves into an active state. V o = V CC – I CR C Next, let’s observe the change in V o as V i increases from zeroĪ Silicon junction transistor remains in a state of Cutoff as long as V i is less than 0.6 V. Now, we will treat V BB as the input voltage (V i) and V CE as the dc output voltage (V o). Now, let’s apply Kirchhoff’s voltage rule to the input and output sides of this circuit. Let’s look at a base-biased transistor, as shown in the figure below, in the CE configuration and analyze its behaviour to understand the operation of a transistor as a switch. When a junction transistor is used in the cutoff or saturation state, it acts as a switch.
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