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Please answer all questions thoroughly with explanation. All work needs to be shown as well.+1 V
lp
υ, ο
Ovo
ON
10 KS2
-1 V
4.
The transistors in this circuit have kn = kp = 2 mA/V2 and Vtn = -Vip = 0.4 V. Find vo for each of the following cases:
(a) Vi= 0 V
(b) Vi=+1 V
(c) Vi=-1 V
(d) Vi = +2 V
(e) Vi=-2 V
Vpp = +5 V
WW
Rp
-OVD
RL
15 k12
RS
-Vss=-5 V
3.
This MOSFET has Vt = 1 V and kn = 2 mA/V2. The Early effect can be neglected.
(a) Find the values of Rs and Rp that result in the MOSFET operating with an overdrive voltage of 0.5 V and a drain voltage
of 1.5 V. What is the resulting Id value?
(b) If RL is reduced from 15 k 2 to 10 k 2, what does Vp become?
(c) If RL is disconnected, what does Vp become?
(d) With Ru disconnected, what is the largest Rp that can be used while the MOSFET is remaining in saturation?
+1.5 V
id
RD
T.
UD
VGS
2.
This NMOS transistor has unCox = 0.4mA/V2, W/L = 25, and V1 =0.4V. Neglect the Early effect.
(a) Find the value of VGS that results in saturation mode operation with a de current of 0.1mA.
(b) Find the value of RD that results in a dc drain voltage of 0.5V.
(c) Find gm and ro at the de operating point specified above. Assume V4 = 5V. [3 points] (d) Find the open-circuit voltage gain
Avo.
(e) If a sinusoidal signal with peak amplitude Vi is superimposed on the de voltage Vos, find the maximum allowable value of
Vi for which the transistor operates in saturation.
+15 V
RBI
Rc
C2
HE
OV.
C
Rsig = 10 k12
HH
RL
10 kA2
RB2
REI
Ž
Vsig
RE2
CE
Rin
=
Rib
1.
The figure above shows a capacitively coupled amplifier. In the following, assume operation at midband frequencies where
the coupling and bypass capacitors behave as short circuits. The BJT has 6 = 99 and the Early effect can be neglected. For
this problem, calculate all values to 2 decimal places of accuracy rather than using resistances from Appendix J.
(a) If the de voltage at the base is to be 5V and the emitter current ImA, find the required value of (REL +RE2). Assume VBE =
0.7V.
(b) If the input resistance at the base, Rib, is to be 10 k, find the required value of REI and hence the value of RE2.
(c) If the de current in RB2 is to be 0.1mA, find the values of RBI and RB2.
(d)Find the value of Rc that results in a de voltage of +6V at the collector.
(e) Find the input resistance Rin and the value of vb/vsig.
(f) Find the value of vo/vb.
(g) Find the value of the overall voltage gain vo/Vsig.
(h) If the peak amplitude of the signal between base and emitter (vvt) is to be limited to 5mV, what are the corresponding amplitudes
of vb, Vsig, and vo?

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