1.
An N-channel JFET has V

_{P}= -4 volts and I_{DSS}= 10 mA.
a.
Find the minimum V

_{DS}for the device to operate in pinch-off, when V_{GS}= -2 volts.
b.
Find the drain current for V

_{GS}= -2 volts, when V_{DS}is 3 volts and 5 volts.
2.
The JFET in the circuit has V

_{P}= - 3 volts, I_{DSS}= 9 mA. Find the values of all resistors so that V_{G}= 5 volts, I_{D}= 4 mA and V_{D}= 11 volts. Design for 0.05 mA in the voltage divider.
3.
An N-channel silicon JFET has a donor
concentration of 2 x 10

^{21}/m^{3}and a channel width of 4 ยตm.
a.
Find the pinch off voltage, V

_{P}
b.
Find the saturation voltage, V

_{DSsat}, if V_{GS}is – 2 volts.
4.
The Q-point of a JFET in a source self-bias
arrangement is chosen at V

_{GS}= - 1.5 volts and I_{D}= 5 mA. Find the value of the resistance R_{S}.
5.
An N-channel JFET has I

_{DSS}= 12 mA and the Transconductance of 4mA/V when V_{GS}= 0 volts.
a.
Find the pinch off voltage, V

_{P}
b.
Find the drain current when V

_{GS}= - 2 volts.
6.
An N-channel JFET has pinch off voltage of – 4.5
volts and I

_{DSS}= 9 mA.
a.
At what value of V

_{GS}in the pinch off region will I_{D}equal to 3 mA?
b.
What is the value of V

_{DS(sat)}, when I_{D}= 3 mA?
7.
For the given JFET, I

_{DSS}= 10 mA and V_{P}= - 4 volts. Find the quiescent values of I_{D}and V_{DS}, when V_{GS}= - 1.5 volts. Assume that JFET is biased in pinch off region.
8.
For the circuit shown, find the Q-point, when V

_{GS}= - 3 volts.
9.
For the P-channel JFET shown, find the Q-point
if I

_{DSS}= 18 mA and V_{P}= 5 volts.
10.
An N-channel JFET has I

_{DSS}= 16 mA and V_{P}= - 6 volts. Calculate the drain current and V_{DS(sat)}when V_{GS}= - 4 volts.
11.
A P-channel JFET has a pinch off voltage of 8
volts. At what value of V

_{GS}does V_{DS(sat)}= - 3 volts?
12.
An N-channel JFET has pinch off voltage of – 5.8
volts and I

_{DSS}= 15 mA. Find the value of I_{D}when V_{GS}is 0 volts, - 2 volts and – 6.5 volts.
13.
An N-channel JFET having a pinch off voltage of –
3.5 volts has a saturation current of 2.3 mA when V

_{GS}= - 1 volt. What is its saturation current when V_{GS}= 0 volts and -2 volts.
14.
A P-channel JFET has a pinch off voltage of 6
volts and I

_{DSS}= 18 mA. At what value of V_{GS}in the pinch off region will I_{D}equal 6 mA? What is the value of V_{DS}at pinch off point?
15.
The JFET shown has I

_{DSS}= 14 mA and V_{P}= - 5 volts. Determine the Q-point for
a.
V

_{GS}= - 3.6 volts
b.
V

_{GS}= - 3 volts
c.
V

_{GS}= - 1.7 volts
16.
Find the Q-point of the JFET shown, if I

_{DSS}= 6 mA and V_{P}= - 3 volts.
17.
Determine the values of I

_{D},V_{GS}and V_{DS}for the JFET shown, if I_{DSS}= 25 mA and V_{P}= 8 volts.
18.
Determine the values of I

_{D}, V_{GS}and V_{DS}of the JFET circuit shown, if I_{DSS}= 2.42 mA and V_{P}= - 4 volts.
19.
Find the values of I

_{D}and V_{DS}of the N-channel JFET shown, if I_{DSS}= 12 mA and V_{P}= - 5 volts.
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