PGT 212 (ELECTRONIC COMMUNICATION TECHNOLOGY)
Laboratory Assessment 1
PLEASE ANSWER ALL THE QUESTION
1. Run the experiments of the active filter configuration as in Figure 1. Then, record the
observation result and graphs for each circuit configuration. The value of resistor is
shown as in Table 1. The input voltage is 2 Vp at frequency of 25 kHz.
Figure 1. Second Order of High Pass Filter
Table 1
R1
10 kΩ
R2
20 kΩ
C1
10nF
C2
10nF
a) Calculate the theoretical cutoff frequency, fc.
b) Determine the output voltage at the cutoff frequency, Vout (fc) by using
oscilloscope.
c) By using the oscilloscope, observe the level of the output voltage, Vout.
d) Determine the filter response characteristic by analysing the input voltage, Vin and
output voltage, Vout signals
e) Use the measured values of Vin and Vout to compute the voltage gain, and (dB).
f) Plot the ideal and experimental voltage gain versus frequency using GRAPH
FREQUENCY RESPONSE to produce the filter response characteristic and discuss on
the result.