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Question 1

For the CE amplifier in Figure (1), given the following component parameters:

Parameter

Value

βDC , βAC

150

VBE

0.7 V

VCC

12 V

RC

820 ?

RE1

100 ?

RE2

220 ?

R1

20 k?

R2

5.2 k?

RL

100 k?

C1, C3

10 µF

718_figure.jpg

Figure 1: Question 1

A
Compute the following DC parameters
(i) IE
(ii) VE
(iii) VB
(iv) IC
(v) VC
(vi) VCE
(Hint: Note the voltage divider is not stiff, so do not assume IB is negligible.)

B
Compute the following AC parameters
(i) Rin(base)
(ii) Rin(tot)
(iii) Av
(iv) Compute the overall gain Ajv when a signal source with a resistance of 1.6 k? is connected to the amplifier.

C What is the theoretical minimum value for C2 if the amplifier must operate over a frequency range from 1 kHz to 5 kHz?

Question 2
For the self biased JFET circuit in Figure (2), given that ID = 1.2mA, compute:
(a) VDS
(b) VGS

1646_figure1.jpg

Figure 2: Question 2

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