FET is advantageous in comparison with BJT because of
As the input circuit of FET is reversed biased, FET exhibits a much higher input impedance (in the order of 100 MΩ) and lower output impedance. So, FET can act as an excellent buffer amplifier but the BJT has low input impedance because its input circuit is forward biased.
For the operation of a depletion-type n-MOSFET, the gate voltage has to be
JFET has main drawback of
JFET has main drawback of having small gain bandwidth product due to the junction capacitive effects and produce more signal distortion except for small signal operation.
The extremely high input impedance of a MOSFET is primarily due to the
In a JFET, at pinch-off voltage applied on the gate
The “drain characteristic” or the “output characteristic” is shown below. Here, in the pinch-off region, as VDS is increased then ID almost remains constant.
What is the value of transconductance when the reverse gate voltage of JFET changes from 4.0 to 3.9 V and the drain current changes from 1.3 to 1.6 mA?
A FET has a drain current of 4 mA. If IDss = 8 mA and VGS(off) = - 6V, then the value of gate to source voltage would be
The gate controls
Which of the following statements associated with FET is/are correct compared to BJT?
1. It has higher cut-off frequencies and switching speed.
2. The performance of FET is relatively more affected by ambient temperature changes.
3. FETs are cheaper to produce.
4. FETs are suitable for the fabrication of ICs because they occupy less space than BJTs.
Hence, statements 1 and 4 are only correct.
Assertion (A): FET does not suffer from thermal breakdown.
Reason (R): FET has a positive temperature coefficient for resistance.