I am currently working on a VLC project to build a VLC receiver. I attached a schematic of the circuit I have designed. The circuit on the left is the transmitter sending a square signal at 1 MHz using the CREE RGB LED. I am receiving the signal at the other end using a OSRAM photo-diode and passing it through front end amplifier to amplify the received signal. Later its sent through a 1st order equalization circuit, to fix my distorted square wave signal. I am unsure whether my equalization circuit is correct since I do not see any change in the signal when I implement this circuit. I also experience a ringing (overshoot and oscillations to settle down) in the output waveform. Could you please help me understand the how I can equalize to get a better response to get a cleaner square wave and also to reduce the ringing in my circuit. Any response is much appreciated. Let me know if you need any more information.
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