3. Below is a BJT based amplifier ;3.9k2 R-100 Ii 4.7k

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3. Below is a BJT based amplifier
3.9k2
37
Vi I
B-100
4.7ks
a. Find IB, IE
b. Draw the load line for this transistor showing the operation point
for this network
c. Draw the n and T network AC circuit for this network
d. Find r.
e. Find Z; and Z, for r, = 70 Kiloohms
f. Find Ap
g. The circuit shown is placed in a karaoke machine, explain why the
quality of sound from the speakers becomes bad as the singer
starts singing loudly and has the best quality when singing softly.
What is this phenomenon called?
Transcribed Image Text:3. Below is a BJT based amplifier 3.9k2 37 Vi I B-100 4.7ks a. Find IB, IE b. Draw the load line for this transistor showing the operation point for this network c. Draw the n and T network AC circuit for this network d. Find r. e. Find Z; and Z, for r, = 70 Kiloohms f. Find Ap g. The circuit shown is placed in a karaoke machine, explain why the quality of sound from the speakers becomes bad as the singer starts singing loudly and has the best quality when singing softly. What is this phenomenon called?
2. A student picks up a MOSFET in his lab and has no idea of what kind
of transistor is it, he only knows the name of the three terminals:
Gate, Source and Drain
The Pinch off voltage he found was V,
= 4V and Inss
10mA
a. What channel type of a transistor is it? Sketch it's junction
diagram.
b. Find drain current for Vas
-1,0, 1, 2, 4
c. Sketch the transfer curve for this transistor showing the two
operational regions.
d. Use the transfer curve to draw a characteristic curve, showing the
ohmic region, pinch off voltage, saturation region and breakdown
voltage.
Transcribed Image Text:2. A student picks up a MOSFET in his lab and has no idea of what kind of transistor is it, he only knows the name of the three terminals: Gate, Source and Drain The Pinch off voltage he found was V, = 4V and Inss 10mA a. What channel type of a transistor is it? Sketch it's junction diagram. b. Find drain current for Vas -1,0, 1, 2, 4 c. Sketch the transfer curve for this transistor showing the two operational regions. d. Use the transfer curve to draw a characteristic curve, showing the ohmic region, pinch off voltage, saturation region and breakdown voltage.
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