Answer / ran145

BJT:
Bipolar junction transistor
1. Uses both electrons and holes for conduction
2. Current controlled device
3. Low input impedance
4. Low current applications
5. more noise
6. Less expensive

FET:
Field effect Transistor
1. Uses either electrons or holes for conduction
2. Voltage controlled device
3. High input impedance
4. High power applications
5. less noise
6. More expensive

Answer / binod kumar naik

bjt is acurrent control device but fet is a voltage control
device.
in case of bjt noise level is more but in fet is less.
in case of bjt impedance is low but fet it is high.

Answer / rakesh kumar .n be

BJT--> BIPOLAR JUNCTION TRANSISTOR ( BOTH ELECTRON AND HOLE)
* IT IS CURRENT SOURCE
FET-->FIELD EFFECT TRANSISTOR(ELECTRON OR HOLE)
*IT IS VOLTAGE SOURCE

Answer / rajbharath

fet has high input impedance compared to bjt
fet has low noise compared to bjt.
fet has low power dissipation compared to bjt

Fet has better temp stability as compared to bjt.
Bjt is more temp sensitive than fet
IMPEDENCE IS HIGH COMPARED THEN BJT. JFET IS VOLTAGE DRIVEN
DEVICE WHILE AS BJT CURRENT DRIVEN DEVICE. IN JFET THERE ARE
NO JUNCTIONS AS IN ORDINARY TRANSISTOR, CONDUCTION IS
THROUGH AN n-TYPE OR p-TYPE SEMICONDUCTOR MATERIAL. FOR THIS
REASON NOISE LEVEL IS VERY SMALL.

Answer / rajbharath

bjt is a bipolar device involving both types of charge
carriers ,where as fet is a unipolar device involving only
one type of charge carrier.the main difference is that bjt
is current controller device and fet is voltage controller
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