DPSK Modulator Circuit Help

Thread Starter


Joined Jun 30, 2010
I have a project wherein a transmitter and at least 2 receivers must be built. The project should use a digital modulating scheme, in this case, DPSK(Differential Phase Shift Keying).

I have researched the WWW and found this website: http://www.electrofriends.com/articles/DPSK/index.html

I submitted the MODULATOR circuit from the website since only the modulator circuit is needed for now.

However, my professor told me that the circuit lacks something. The problem is I didn't know what it was. Can you help me on what's lacking?