CP/PC364 Data Communications and Networks Laboratory

Frequency Modulation Pre-Lab

The following two weeks we will investigate Frequency Modulation and Demodulation. Using the XR-2206 and XR-2212 datasheets (provided below) determine the following and record in your lab notebook:
NOTE: The supply voltages must be the same for both ICs

Frequency Modulation

Using the XR-2206 datasheet sketch (or print and paste into your lab notebook) a circuit for frequency sweep
- determine what timing capacitor and timing resistor (R) to use for a frequency of 100 Hz (refer to table 1)
- let R_C = R
Determine which pin of the 2206 is used for the input wave.

Frequency Demodulation

Using the XR-2212 datasheet find and sketch (or print and paste into your lab notebook) a circuit that will take your frequency modulated signal (from the 2206) and demodulate it.
- where does the incoming modulated signal (from the 2206) connect to the 2212 for demodulation?
Determine R₀, R₁, R_c, R_f, C₀ and C₁ using the design instructions on the datasheet (pages 10, 11 & 12).
Write down all the parts you will need (chips, resistors, capacitors, # of alligator clips, # of scope probes)

*Table 1: Available Parts*
Power Supplies	Resistors (Ω)		Variable Resistors (Ω)	Capacitors (μF)
GND (0V)	10	1k	500	0.001	0.01
+5V	3.9k	4.7k	10k	0.033	0.047
+12V	5.1k	10k	20k	0.1	0.22
-12V	20k	51k	50k	0.33	0.47
	100k	1M		1	10

Resources

To view pdf documents, you can download Adobe Acrobat Reader .

If you need to update a browser, you might try Firefox which is

free
open source
available for several platforms

Since this page uses cascading style sheets for its layout, it will look best with a browser which supports the specifications as fully as possible.

If you are looking for an office package, with a word processor, spreadsheet, etc., you might try LibreOffice which is

free
open source
available for several platforms

Go to the main page for the Department of Physics and Computer Science.