Name:_________________________________________
EE 3220
Test #
3
Spring
2000
SSN:__________________________________________
1.
10.8
short
Use a nyquist plot to determine whether the following transfer function is
stable.
2.
13.7
Find the oscillation frequency of this colpitts oscillator using a quartz crystal.
3.
10.6 short
A transresistance amplifier has a gain of A
r
=1500, input impedance of
50
Ω
and output impedance if 85
Ω
.
It is connected to a negative feedback circuit with
β
= .01.
Find A
fb
, R
in
, R
out
, if r
in
β
= r
out
β
= 1M
Ω
.
Which type of feedback topologies
are needed.
Sketch the block diagram showing the forward and fee
4.
10.1
short
An amplifier has a very large but unstable open loop gain.
To fix this
problem, we have added a feedback network that has
β
= 0.01.
Find the open loop
gain that will drop the ideal closed loop gain by 5%.
5.
10.3
short
An amplifier has an open loop gain of 10
5
, the bandwidth is 10Hz.
What
would the bandwidth be if we added a feedback network with
β
= 0.01?
6.
11.8
A power amplifier needs to dissipate 30 Watts of power.
The device
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 Spring '06
 Audiffred
 Amplifier, Frequency, #, Input impedance, 5%, Electrical parameters, 30 WATTS

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