Digital Electronics
FET
Field-Effect Transistor or Unipolar Transistor
History of FET
FET was patented by
Julius Edgar Lilienfeld
in 1925 but the fi rst
working FET was
invented successfully
by Shockley in 1947
The Path Breaking Innovation: FET
Field-Effect Transistor is a three terminal unipolar voltage
controlled semiconductor device that has a high input impedance
operates according to the principals of electric field.
FET provides the flow of carriers ,which are electrons and holes, between
drain (D) and source (S) depending on the voltage applied on the gate (G)
so, thereby FET acts as a key role in the circuit. FETs are used for
amplification and switching operations by using charge carriers. FET is
divided into two types: JFET and MOSFET. FETs are used comfortably in
high frequency circuits with their high input impedance and capacitance
between low electrodes.
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TERMINALS
STATISTICS
TYPES
FETs are devices which
have three terminals:
Drain(D), source(S) and
gate(G).
The most widely used FET
and the most advanced
type of transistor is the
MOSFET
FET can be classifīed
into two types: p-type
channel and n-type
channel.
Usage Areas
FET is used in
measuring
instruments such as
voltmeters,
oscilloscopes,
ohmmeters.
Moreover, it is used in
digital integrated
circuits, analog signal
and amplifīer circuits