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Frequency Modulator/Demodulator (v2.0.2b15)

screenshot of the scene

Author: s_noonan

Group: Technical

Filesize: 23.53 kB

Date added: 2012-12-10

Rating: 5.6

Downloads: 476

Views: 256

Comments: 4

Ratings: 2

Times favored: 0

Made with: Algodoo v2.0.2 Edu


Scene tag

Open the Scope display and use the Move tool to move the scope wheel in front of the laser beams.

Note: The percentage of modulation is small (about 7%), so you probably will not notice it on the modulator output. The phase detector is an exclusive-OR (XOR), so its output is a fixed amplitude wave with a pulse width proportional to the phase offset.
Last edited at 2016/07/02 20:53:27 by s_noonan
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Something wrong with modulator
Kilinich is right. The output of the modulator is the unmodulted oscillator. Also, the output of the phase detector isn't right either. Sorry, Steve, but it appears that this scene needs some fixin'. :unsure:
I reset Algodoo and it still works fine for me. Do you get a sine wave at the amplifier output? If so, then it is working. The amount modulation is not much (about 7%), so you won't see it on the modulator output signal. The phase detector is an exclusive-OR (XOR), so its output is a pulse width proportional to the phase offset. I tried greater modulation and detecting it with a phase locked loop, but was unsucessful.
Last edited at 2012/12/11 06:49:25 by s_noonan
Yes, it's working as you described. I was looking to see a much bigger change in the output of the modulator, which I did not see, so I assumed that it wasn't working (I suspect that Kilinich reached the same conclusion). With only 7% FM, the output is very difficult to see visually on the scope. And now I see the PWM waveform on the output of the phase detector. I wasn't expecting that, but it's definitely working! Good job! :tup: