6. Which statement is correct? a) the device pinches-off when Vo-Vasat, which is

Question

6. Which statement is correct? a) the device pinches-off when Vo-Vasat, which is called the saturation voltage. c) The region Vo Vasr is called the linear region and that at or larger than Vasw is the saturation region d) At Vo Vaat the current from the linear region equation is smaller than the saturation current. 7. Which statement is correct? a) The current in the linear region is |, | r,-k·2(-(h-K) b) the current in the linear region is a function of Vo. c) the current in the saturation region is d) the current in the saturation region does not depend on Vo e) the current in the liner and saturation regions depends on Va

Explanation / Answer

6.

a) The device pinches off when Vds = Vp. Vp is the pinch off voltage. The voltage at which the drain current is almost constant even though Vds is varies. So this is not correct statement. Only when Vds=Vp or Vds > Vp FET in saturation so not just by having Vd = Vd(sat) mean that FET in saturation.

b) the given equation is Vd sat = Vp+Vg-Vbi

This is also incorrect because JFET saturates at drain to source voltage equal to pinch off voltage. So Vds(sat) =Vp

c) this is correct statement. When Vds less than Vp then that FET is in linear region. When Vds greater than Vp then FET will be in saturation.

d) this is also incorrect current in linear region depends on Vgs. So we cannot say this current will be smaller than Id(sat)  

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