Determine the value of gm and theoretically
recalculate the voltage gain using
Equation (2.24). Compare your results with the theoretical results.
Does inclusion of give results
which are in better agreement with experiment?
Notice that the 200K resistor provides the base current necessary
for establishing a DC bias.
3.
Measure the DC voltages to make sure the BJT is in the forward active
region. If it's not in forward active, adjust your resistor values
to compensate.
4.
Perform a small signal theoretical analysis to predict what the
voltage gain of the circuit should be.
5.
Measure the voltage gain.
Adjust the input signal from your wavetek to approximately 10mV amplitude,
with a frequency of 100kHz. What is the voltage swing?
(If your signal source cannot reach as low as 10mV, you can use
a simple voltage divider to achieve the required level.)
6.
Do the measured values for gain and swing agree with your
theoretically predicted ones to within 25% error?
7.
Design: Theoretically determine what new value of RC you
need to reduce the gain by 50% of what your measure above.
What is the new swing.
8.
Substitute this new value of RC and measure the gain and the
swing.
Does the values agree with your theoretically predicted values
to within 25% error?