TRANSISTOR AS AN AMPLIFIER From mobile phones to televisions, vast number of products include amplifiers for sound reproduction, radio transmission, and signal processing. There are two input terminals for the signal to be amplified and two output terminals for the connecting the load and a means of supplying power to the amplifier. The amplifier thus produces an enlarged version of the input signal. TRANSISTOR AS AN AMPLIFIER An amplifier is a device which is used for increasing the amplitude of variation of alternating voltage or current or power. 0 volts drop across the output, causing 10 volts to drop across the load resistor.The collector-emitter terminal acts like a closed switch.TRANSISTOR AS A SWITCH In this condition transistor is reffered to as being in saturation. The depletion region across the emitter-base junction shrinks as much as possible. TRANSISTOR AS A SWITCH When the switch is in open position, a voltage is present across base-emitter junction. In this condition, the transistor is reffered to as being in cut-off.
The supply of 10 volts drops across the collector output.The emitter -collector terminal acts like an open.TRANSISTOR AS A SWITCH When the transistor is off: The depeltion region across the emitter-base junction is large. TRANSISTOR AS A SWITCH When the switch is in open position, there will be no potential difference between the base and the emitter. Maximum power rating – Low ,Medium ,High.Polarity – NPN ,PNP(BJT’S) N-Channel,P-channel(FET’S).Structure – BJT ,JFET ,IGFET(MOSFET) ,IGBT.Semiconductor device-germanium ,silicon, gallium arsenide ,silicon carbide etc.Transistor is a semiconductor device made of a solid piece of semiconductor material ,with atleast three terminals for connection to an external circuit.
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