![]() Noise is an undesirable disturbance super-imposed on a useful signal. FETs are generally used in digital switching circuits though their operating speed is lower.Īpplications of FET 1. ![]() FETs are used as voltage-variable resistors (WRs) in operational amplifiers (op-amps) and tone controls etc, for mixer operation on FM and TV receivers and in logic circuits.As a FET chip occupies very small space as compared to BJT chip, FETs are widely used in ICs.FETs are widely used as input amplifiers in oscilloscopes, electronic voltmeters and other measuring and testing equipment because of their high input impedance. Hence FET is an ideal device for use in almost every application in which transistors can be used. low input impedance with consequent of loading of the signal source are eliminated in FET. FET, also called unipolar transistor is a transistor used to control the electrical behaviour of a device.įET has a very high input impedance (100 Mega ohm in case of JFETs and 10 4 to 10 9 Mega Ohm in case of MOSFETs), the major shortcomings of an ordinary transistor i.e.
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