AM Modulation and Demodulation - University of Dayton : Homepages

v2() t
(V)
0.3
0.25
0.2
0.15
0.1
0.05
Figure 4: Input/Output voltage relationship for nonlinear circuit (data from PSPICE with D1N4148
diode and 1.8k Ohm resistor wi th no additional load).
3. Prelab Assignment
0
0.2 0.3 0.4 0.5 0.6 0.7 0.8
v1() t (V)
Figure 5: Envelope detector for simple demodulation of DSB-LC signals.
• Design a simple RLC bandpass filter centered at 600kHz with a 40kHz bandwidth (i.e.,
attenuation < -3dB in a 40kHz passband) using available component values. The lab has
10uH, 47uH, and 100uH inductors. The available resistor values are shown in Table 1
and the available capacitor values are shown in Table 2. Make sure you convert your
design frequencies to radians/sec before using standard filter formulas. Verify your
design with a PSPICE frequency sweep analysis.
R. C. Hardie, Department of Electrical and Computer Engineering,
University of Dayton, Fall 2003
4