d) In Figure 3.3 shows the circuit diagram of a typical n-channel JFET common source amplifier. If ac input impedance of this amplifier is RGG=1.XY MOhm, VG = 2.XYV, RD=1.5 x Rs and VDD = 15 V. Determine the value of Rs to set the Q-point to VGs = -0.5 V and ID=2.5 mA. What is the value of VDs at the Q-point? Sketch the amplifier's small signal equivalent circuit model. If the JFET transconductance at this bias point (Q-point) is gm=4.XY ms and go=0.1 ms, what is the AC open circuit voltage gain Av and the AC short circuit current gain Ai of this amplifier RG1 Cin HH in RG2 VG Ro Rs + VDD Vo Cout www3 Vout Cs lout x=1 y=7

d) In Figure 3.3 shows the circuit diagram of a typical n-channel JFET common source amplifier. If ac input impedance of this amplifier is RGG=1.XY MOhm, VG = 2.XYV, RD=1.5 x Rs and VDD = 15 V. Determine the value of Rs to set the Q-point to VGs = -0.5 V and ID=2.5 mA. What is the value of VDs at the Q-point? Sketch the amplifier's small signal equivalent circuit model. If the JFET transconductance at this bias point (Q-point) is gm=4.XY ms and go=0.1 ms, what is the AC open circuit voltage gain Av and the AC short circuit current gain Ai of this amplifier RG1 Cin HH in RG2 VG Ro Rs + VDD Vo Cout www3 Vout Cs lout x=1 y=7

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

d) In Figure 3.3 shows the circuit diagram of a typical n-channel JFET common
source amplifier. If ac input impedance of this amplifier is RGG=1.XY
MOhm, VG = 2.XYV, RD=1.5 x Rs and VDD = 15 V. Determine the value of
Rs to set the Q-point to VGs = -0.5 V and ID=2.5 mA. What is the value of
VDs at the Q-point? Sketch the amplifier's small signal equivalent circuit
model. If the JFET transconductance at this bias point (Q-point) is gm=4.XY
mS and go=0.1 ms, what is the AC open circuit voltage gain Av and the AC
short circuit current gain Ai of this amplifier
Vin
RG1
Cin
HH
RG2
-41
VG
+ VDD
RD
Rs
VD Cout
www11
Figure 3.3
Vout
Cs
¡out
x=1
y=7

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answer part b,c, and d
Find the desired in point 54 with finding what you can find.
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Help
Hand Calculation: Since you now have the values of R1 and R2 resistors, obtain numeric value of voltage gain Av=Vo/Vi, and numerical values of input and output resistances Ri and Ro. Note that you need to DC analysis first. Do a hand calculation and calculate the DC collector current or IC. This is needed in order to calculate the small signal parameters gm and rπ and in turn to obtain the Av , Ri and Ro Hence, first perform a DC analysis (use the circuit in Figure 1 and take all capacitors open) and assume your transistor has a β=140.
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