Dream Catcher ME3000 Analog Electronics Lab 6 Manuel - Page 5
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3.
Frequency Response
11. Set the function generator output to 40 mVpp.
12. Connect the function generator output to TP1 and reference to GND using the BNC-to-
grabber clips coaxial cable.
13. Connect the oscilloscope CH1 probe to TP1 and GND.
14. Connect the oscilloscope CH2 probe to TP6 and GND.
15. Set the trigger signal to CH1.
16. Sweep the function generator frequency from 2 MHz to 8 MHz in 100 kHz increments.
17. Record the peak-to-peak voltage at the input (CH 1) and output (CH 2), and determine the
magnitude of the voltage gain, A
18. Plot the A
versus frequency curve and estimate the resonance frequency of the amplifier
V
from the curve. The input and output waveforms should be approximately 180 out of phase
during resonance. The voltage gain, A
theoretical resonance frequency given as
19. Use the calculated A
A
g
(
r
V
m
ce
20. Calculate the early voltage, V
ME3000 Analog Electronics
as a function of frequency.
V
is at its maximum when resonance occur, with the
V
at resonance to estimate the value of r
V
R
||
R
)
r
L
L
ce
A
V
R
L
g
m
of the transistor using
A
1
f
, where L = 4.7 H and C = 100 pF.
o
2
LC
using
CE
A
V
.
g
m
V
r
A
.
ce
I
C
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Lab 6 - 5/19