The set up of my experiment so far:
A. I use a simple LM317 linear voltage regulator to supply constant voltage of +5V to Vdd of my Laser driver circuit.
B. Also I use another LM317 linear voltage regulator to supply voltage Vlda ( Up-to 12 volts ). Just the same way I shown in the previous figure , the source is from a 12V lead acid battery with 7.2 AmpHour rating.
C: The circuit of the Laser Driver:
A : I don't get a clear pulse waveform and it seems very noisy. This is not the case if I directly supply voltage from a battery without the LM317 in between.
B : What is the difference between AGND ( analog ground ) and just Ground ( please see the highlighted areas in Laser Driver circuit ). I have shorted them as of now.