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ME3000 Analog Electronics
Lab 6 - 6/19
4.
Voltage Gain Estimation
21. Unplug the jumpers from J28 and J29.
22. Set R
L
= 470
by connecting jumpers to J30 and J31.
23. Set the function generator output to 40 mVpp and the output frequency to the resonance
frequency value measured earlier.
24. Connect the function generator output to TP1 and reference to GND.
25. Connect the oscilloscope CH1 to TP1 and GND.
26. Connect the oscilloscope CH2 to TP6 and GND.
27. Set the trigger signal to CH1.
28. Record the peak-to-peak voltage at the input (CH 1) and output (CH 2), and determine the
magnitude of the voltage gain, A
V
.
29. Determine the amplifier voltage gain using
)
||
(
L
ce
m
V
R
r
g
A
and the r
ce
and g
m
values
calculated earlier. Compare the calculated value with the value measured in step 28.
30. Repeat steps 28 and 29 for R
L
= 1470
by unplugging the jumpers from J30 and J31 and
connecting the jumpers to J28 and J32.
31. Turn off the power supply and disconnect all the cables from the Class A Tuned Amplifier
section.
