|1 Crore+ students have signed up on EduRev. Have you?|
Comparing the size of BJT and FET, choose the correct statement?
BJT usually are built with a thickness of up to 1cm whereas the FET uses a fabrication technique which makes its size in mm.
For a FET when will maximum current flows?
For a FET the current reaches maximum that is IDSS occurs when Vgs = 0V and VDS > = |Vp|
The Shockley equation is _________
By using the diode equation Shockley derived the equation between the drain current and voltage Vgs.
To use FET as a voltage controlled resistor, in which region it should operate?
By varying the gate to source voltage, Resistance can be varied as follows rd = ro/(1-Vgs/Vp)2
For a p-channel FET, What is the direction of current flow?
When the voltage is lesser than pinch off, the current flows from Source to Drain.
The forward bias drain and gate is the reason for the flow of electron from Drain to source, as the conventional current flows opposite to the electron flow, the current will flow from Source to Drain.
Which of the following statement is true about FET?
Because of the Sio2 insulator, doped between drain and source at the top, the resistance offered by this is very high. The insulator will stop the flow of electron from one part to another which acts as an open circuit.
What is the main advantage of FET which makes it more useful in industrial applications?
Because of its small size, the IC chips can be made even smaller which reduces the wear and tear. The process technology used with process technology constant a which is the ratio of Width and Length, the FET is made more advantageous.
What is the value of current when the gate to source voltage is less than the pinch off voltage?
When the gate to source voltage is less than pinch off, both of the junctions will be reverse biased and hence no current flows.
What is the value of drain current when Vgs=pinch off voltage?
ID = IDSS (1-Vgs/Vp)2
If Vgs = Vp,then
ID = IDSS (1-1)=0.
For an n-channel FET, What is the direction of current flow?
When a voltage greater than pinch off is applied, the current starts flowing from Drain to source.