PASCO EM-8656 AC_DC ELECTRONICS LABORATORY - Manual (Page 111)

107
012-05892A AC/DC Electronics Laboratory
®
➉
Turn off the power switch on the back of the power amplifier. Turn off the DC power supply.
Voltage (peak) of OUT = ________ V
Voltage (peak) of A = ________ V
Analyzing the Data
➀
Use the values you recorded to calculate the ratio of input voltage (Voltage of OUT) to output
voltage (Voltage of A).
V
in
V
out
=
Voltage "OUT"
Voltage "A"
= ___________
➁
The theoretical output voltage is as follows:
V
out
= −
V
in
R
C
R
E
= ____________
where R
C
is the value of the resistor in series with the collector terminal (2 k ), and R
E
is the
value of the resistor in series with the emitter terminal (1 k ). Calculate the theoretical output
voltage for the common-emitter amplifier.
Questions
➀
What is the phase relationship between the input signal and the output signal?
➁
How does the actual output voltage compare to the theoretical value?
Optional
➀
Increase the Amplitude in the Signal Generator window by 0.02 Volt increments. Observe the
shape of the output signal.
➁
Increase the Frequency in the Signal Generator window. Observe the shape of the output signal.
Optional Questions:
➀ How does the shape of the output signal change as the input Amplitude is increased?
➁
Is the voltage gain of the amplifier dependent on the frequency, or independent of the frequency?
What is your evidence?