VGS(off) =6 V. What is Ip when Ves =8 V? GS 9. The JFET in Figure 8-68 has a Vastoff =-4 V. Assume that you increase the supply voltage. VDD, beginning at zero until the ammeter reaches a steady value. What does the voltmeter reau at this point?

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18. An has a of 12 mA and a 100 2 What
PROBLEMS 443
FIGURE 8-68
A.
10. The following parameters are obtained from a certain JFET datasheet: osum=-8 Vand
Inss = 5 mA. Determine the values of Ip for each value of Ves ranging from 0Vio-8 V in 1 V
steps. Plot the transfer characteristic curve from these data
11. For the JFET in Problem 10, what value of Ves is required to set up a drain current of 2.2SMA?
12. For a particular JFET, gm0 = 3200 uS. What is g when Vos=-4V, given that
-8 V?
VGS(off)
13. Determine the forward transconductance of a JFET biased at Ves=-2 V. From the datasheet.
Vesiert = -7 V and g = 2000 µS at Ves= 0 V. Also determine the forward transfer condact-
VGStoff)
%3D
ance, gfs
14. Ap-channel JFET datasheet shows that less= 5 nA at Ves= 10V. Determine the inpot resistance.
15. Using Equation 8-1, plot the transfer characteristic curve for a JFET with & =8 mÀ and
Vostoff)=-5 V. Use at least four points.
con 8-3 JFET Biasing
16. Show a self-biased n-channel JFET.
17. Show a voltage-divider-biased p-channel JFET and a current-source-biased n-chanpel 373T
18 An nuchannel self-biased JFET has a drain current of T2 mA and a 100 source resistor What
is the value of Vas?
lue of Rs required for a self-biased JFET to produce a
Vos of-4 V when
Transcribed Image Text:18. An has a of 12 mA and a 100 2 What PROBLEMS 443 FIGURE 8-68 A. 10. The following parameters are obtained from a certain JFET datasheet: osum=-8 Vand Inss = 5 mA. Determine the values of Ip for each value of Ves ranging from 0Vio-8 V in 1 V steps. Plot the transfer characteristic curve from these data 11. For the JFET in Problem 10, what value of Ves is required to set up a drain current of 2.2SMA? 12. For a particular JFET, gm0 = 3200 uS. What is g when Vos=-4V, given that -8 V? VGS(off) 13. Determine the forward transconductance of a JFET biased at Ves=-2 V. From the datasheet. Vesiert = -7 V and g = 2000 µS at Ves= 0 V. Also determine the forward transfer condact- VGStoff) %3D ance, gfs 14. Ap-channel JFET datasheet shows that less= 5 nA at Ves= 10V. Determine the inpot resistance. 15. Using Equation 8-1, plot the transfer characteristic curve for a JFET with & =8 mÀ and Vostoff)=-5 V. Use at least four points. con 8-3 JFET Biasing 16. Show a self-biased n-channel JFET. 17. Show a voltage-divider-biased p-channel JFET and a current-source-biased n-chanpel 373T 18 An nuchannel self-biased JFET has a drain current of T2 mA and a 100 source resistor What is the value of Vas? lue of Rs required for a self-biased JFET to produce a Vos of-4 V when
(b) of the or decrease?
3. the for a and an JFET. the terminals,
2. the of an JFET be 0 or negative?
(a) Does the depletion region narrow or wide
D) Does the resistance of the channel increase or decrease?
+VDD
FIGURE 8-67
(b)
(a)
5. A JFET has a specified pinch-off voltage of 5 V. When Ves = 0, what is Vps at the point where
the drain current becomes constant?
Section &-2 JFET Characteristics and Parameters
6. A certain n-channel JFET is biased such that VGs =-2 V. What is the value of Vesofm if V, is
specified to be 6 V? Is the device on?
7. A certain JFET datasheet gives Vastoff) =-8 V and Ipss = 10 mA. When Ves = 0, what is h
for values of Vps above pinch off? Vop = 15 V.
8. A certain p-channel JFET has a Vesiofm= 6 V. What is Ip when Ves = 8 V?
9. The JFET in Figure 8-68 has a Vasioff) =-4 V. Assume that you increase the supply voltage.
VDD, beginning at zero until the ammeter reaches a steady value. What does the voltmeter read
at this point?
GS(off)
Transcribed Image Text:(b) of the or decrease? 3. the for a and an JFET. the terminals, 2. the of an JFET be 0 or negative? (a) Does the depletion region narrow or wide D) Does the resistance of the channel increase or decrease? +VDD FIGURE 8-67 (b) (a) 5. A JFET has a specified pinch-off voltage of 5 V. When Ves = 0, what is Vps at the point where the drain current becomes constant? Section &-2 JFET Characteristics and Parameters 6. A certain n-channel JFET is biased such that VGs =-2 V. What is the value of Vesofm if V, is specified to be 6 V? Is the device on? 7. A certain JFET datasheet gives Vastoff) =-8 V and Ipss = 10 mA. When Ves = 0, what is h for values of Vps above pinch off? Vop = 15 V. 8. A certain p-channel JFET has a Vesiofm= 6 V. What is Ip when Ves = 8 V? 9. The JFET in Figure 8-68 has a Vasioff) =-4 V. Assume that you increase the supply voltage. VDD, beginning at zero until the ammeter reaches a steady value. What does the voltmeter read at this point? GS(off)
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