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
|
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
Figure 2: Question 2