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BJT and FET

Why BJT is known as current controlled device and FET is known as voltage controlled device?

Total Answers and Comments: 4

Last Update: November 23, 2009 Asked by: akram412

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Submitted by: gowri

BJT is a current control device where as FET is a voltage control device.

Above answer was rated as good by the following members:
vrams

March 11, 2009 03:28:15

gowri

Member Since: November 2005 Contribution: 2

RE: difference between bjt and fet

BJT is a current control device where as FET is a voltage control device.

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June 24, 2009 07:47:10

ubabmar

Member Since: June 2009 Contribution: 7

RE: difference between bjt and fet

1. In BJT because of the current the output will vary.
2. Where as in FET by means of Voltage the output is varied.

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November 23, 2009 06:35:59

Prasannavj

Member Since: September 2009 Contribution: 2

RE: difference between bjt and fet

BJT: Secondary break down occurs.
Lower Input impedance
Lower operating frequency
Higher switching losses

FET: PTC for resistance
No sec break down
Higher operating frequency
Higher input impedance
lower swithing losses

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November 23, 2009 06:39:11

Prasannavj

Member Since: September 2009 Contribution: 2

RE: difference between bjt and fet

BJT as current controlled device -
Base current controls the collector an emitter currents

FET as voltage controlled device-
Field of p or n region decides width of conducting channel in n type or p type FET

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