In the junction FET the channel is a composite part of the structure. In the MOSFET the gate is insulated from the source and drain regions and the channel forms when the gate voltage is applied. Unlike the bipolar transistor both types of FET require virtually no input current to the gate except a pulse to charge or discharge the gate capacitance. Junction FETs have relatively slow switching speeds compared with MOSFETs and bipolar transistors, and are therefore not used in logic circuits. FETs appear in vast numbers in microprocessor chips and similar devices.
"field-effect transistor." A Dictionary of Computing. . Encyclopedia.com. (February 23, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/field-effect-transistor
"field-effect transistor." A Dictionary of Computing. . Retrieved February 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/field-effect-transistor
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field-effect transistor: see transistor.
"field-effect transistor." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 23, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/field-effect-transistor
"field-effect transistor." The Columbia Encyclopedia, 6th ed.. . Retrieved February 23, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/field-effect-transistor