signal distortion for common power supply

[yokel]

I am using two PWM amplifiers for amplifying two PWM signals which are 90degree out of phase. Both the amplifiers are run from the same dc power source and common ground. I am providing the PWM signals from function generator.

Now the problem is- in the output end the rising and falling of one signal is distorting the shape of another signal and vice versa. Can anyone tell me the probable reasons and how I can solve this problem.

thanks a lot in advance

 

[SeungminLee]

There are so many many problems which affect other part IC chips.

First of all, make power line enough large not to act as a resistor. (ground, too)

Second, seperate power and ground lines from the its output pin of power reculator (or supply). Search about power feedbak.

Thrid, place enough capacitors between +V to ground. this will effectively reduce such effect.

I hope this will help.
anyway, good luck.