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Chapter 4 Problems: 10, 11, 13, 21, and 24
10. Assume a JFET has the transconductance curve shown in Figure 4–76. (a) What is IDSS? IDSS=6.4mA (b) What is VGS(off)? VGS=-5V (c) What is the transconductance at a drain current of 2.0 mA? Transconductance=1.5
11. Assume the JFET with the transconductance curve shown in Figure 4–76 is connected in the circuit shown in Figure 4–77. (a) What is VS?
VD = VDD - ID*RD = 15V - (2.1mA) (3.3k Ω) = 8.07V
ID = IS 2.1mA
VS = IS * RS = 2.1mA * 1k Ω 2.1V

(b) What is ID? ID = IDSS ( 1- (VGS/VGSoff))2
6.4 ( 1 - ( -2.1 / -5 )2 2.1 mA
(c) What is VDS?
VDS = VDD - ID(RD + RS)
15V - (2.1MA) ( 4.3k Ω ) 15V - 9.03 = 5.97V

13 .For each circuit in Figure 4–78, determine VDS and VGS. VD = VDD – ID *RD
VS = IS *RS
VDS = VDD - ID(RD + RS) VGS = VG - VS

a) VD = 12V - (1mA) (4.7k Ω) = 7.3V VS = (1mA) (1k Ω) = 1V VDS = 12V - (1mA)(5.7k Ω) = 6.3V VGS = 0V - 1V = -1V
b) VD = 9V - (3mA) (470 Ω) = 7.59V VS = (3mA) (100 Ω) = .3V VDS = 9V - (3mA)(570k Ω) = 7.29V VGS = 0V - .3V = -.3V
c) VD = -15V - (5mA) (2.2k Ω) = -26V VS = (5mA) (470 Ω) = 2.35V VGS = 0 + 2.35V = +2.35V

21 .Each E-MOSFET in Figure 4–81 has a VGS(th) of +5 V or −5 V, depending on whether it is an n-channel or a p-channel device. Determine whether each MOSFET is on or off. (a) Since VGS > VGS(th), the device is on.
(b) Since VGS < VGS(th), the device is off.

24. (a) Assume VGS = −2.0 V for the circuit in Figure 4–83. Determine VG, VS, and VD. (b) If gm = 3000 mmho, what is the voltage gain? (c) What is

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