transistor has 2 output 1 and 0 so can be used as a switch
Biasing is used in a transistor amplifier circuit in order to place the transistor as nearly as possible in the center of its linear region. Transistors have cutoff, linear, and saturation regions. Too little bias current, and you enter cutoff - Too much, and you saturate. Both conditions cause distortion when you attempt to use the transistor as an amplifier, as opposed to a switch.
A transistor used as a switch is operated in saturated mode, where the ratio of base-emitter current over collector-emitter current is far more than hFe, or beta gain. The transistor is either fully on or fully off in this mode. A transistor used as an amplifier is operated in linear mode, where the ratio of base-emitter current over collector-emitter current is equal to or less than hFe, or beta gain. The transistor is partially on in this mode, and is operating as a current controlled current sink.
The Junction Field Effect Transistor (JFET)exhibits characteristics which often make it more suited to a particular application than the bipolar transistor. Some of these applications are: - High Input Impedance Amplifier - Low-Noise Amplifier - Differential Amplifier - Constant Current Source - Analogue Switch or Gate - Voltage Controlled Resistor
Biasing is used in a transistor amplifier circuit in order to place the transistor as nearly as possible in the center of its linear region. Transistors have cutoff, linear, and saturation regions. Too little bias current, and you enter cutoff - Too much, and you saturate. Both conditions cause distortion when you attempt to use the transistor as an amplifier, as opposed to a switch. Type your answer here...
operating region of the transistor is the area of the voltage and an electronic configuration in which a transistor can work with its full efficiency. In that operating region transistor can be used easily what above said by harsh is correct...the following may help u further... Based on application the transistor is decided where to lie. for example transistors are made to lie in active region to make it as amplifier. when transistors are used as switch it is made to lie in saturation region(when switch is made as ON) and cut-off region(when switch is made as OFF).....
A transistor is an electronic component that can be used as an amplifier or a switch. It has 3 connections: base, collector, emitter. It conducts electricity via the emitter to the collector only when the right voltage is applied to the base. As an amplifier, the amount of current it conducts at any instant will vary in a manner which depends on the instantaneous value of the varying voltage that is applied to the base.
When used as a switch, a transistor is usually driven completely on (saturation) or completely off (cutoff). There are a few kinds of switching circuits though (e.g. ECL) that avoid saturation/cutoff to obtain faster speed, these operate on a fixed constant current and switch it through one of two transistors. When used as an amplifier it is biased so that it operates in a linear, or near-linear, part of its characteristic curve so that the output faithfully copies the input.
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