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Differentiate BJT and MOSFET.

written 9.8 years ago by teamques10 ★ 70k

•   modified 9.8 years ago

Mumbai University > EXTC > Sem 3 > Analog Electronics 1

Marks: 4 M

Year: May 2014

analog electronics

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written 9.8 years ago by teamques10 ★ 70k

Parameter	BJT	MOSFET
Full form	Bipolar Junction Transistor	Metal oxide semiconductor field effect transistor
Controlled	BJT is current controlled device	MOSFET is voltage controlled device
Output Current	It is controlled by the input base voltage	Controlled by input gate voltage
Current Gain	Low compared to MOSFET and not constant. Decreases with increase in collector current	Very high. And nearly constant for varying drain current
Input resistance	Low compared to MOSFET	Very high. More than $10^7Ω$
Input current	Due to low input resistance the input current is in the range of milliamps	Due to high input resistance the input current is in the range of picoamps(nearly zero)
Power consumption efficiency	Bjt devices consumes more power than MOSFET devices	MOSFET devices are more power efficient than BJT devices
Switching speed	BJT have less switching speed than MOSFET	MOSFET have better switching speed.
Threshold voltage	BJT have lesser,threshold,voltage (0.7V)	MOSFET have higher threshold voltage $(\gt+1v)$
Application	Suitable for driving low power devices like LED	High power application
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