ECET310 Week 2

ECET310
Week 2 TEST
NAME:______________________________.
GRADE= /32
Note:
There are 2 pages.
3 points for each blank.
Complete the test and put into drop box (week 2 TEST) for
grade. Keep answers in 2 digits after
decimal point. Must submit in time
(time stamp verified). No grade for no
or wrong units.
1..png”>.png”>.png”>
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.png”> Ap1=10dB Ap2=20dB Ap3=30dB
.png”> NF1=3dB NF2=4dB NF3=5dB

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A three stage amplifier is
shown. The operating bandwidth is 300 KHz at a temperature of 20° C. The output load is 1.5K?.
a. Total power gain as a
number = ____________
b. total NF as a number =
____________
c. Total thermal noise power
at input = __________
d. Total noise power at output
= ____________
e. Output noise voltage =
____________

2.
Determine percent of total harmonic
distortion if fundamental has RMS voltage of 5 V, 2nd harmonic is 1V, and 4th harmonic is 0.7V and 5th
harmonic is 0.5V.
Answer= ______________

3.
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Note: R=1?,
C=79.58uF, L=477.46uH
For
the circuity above, the frequency of source signal is tunable, and we intend to
tune to resonant frequency Fr. (The
followings are sequential events)
a) Fr= _____________
b) When the circuit is tuned
to Fr, the current through R measured using DMM
= _____________; and Power delivered to that 1? resistor = ___________.
(note: 1V in the circuit is the peak value)
c) The system requires that
the engineer to increase the resonant frequency to be 10 times of Fr found in
(a) and can only change capacitor and keep R and L unchanged.
The new capacitor value = _____________.
d) The engineer replaces the
R in the circuit above with a 100? resistor, then resonant frequency of this
new circuit, Fr=_____________.
e) After operating at Fr for
a while, suddenly capacitor in the circuit is burnt to become OPEN, then we shall see that the current through R (100?
) measured using DMM become ___________ (increased, decreased, or unchanged).