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How to remove the noise on bridge ?

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turbina

turbina

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i maked a bridge with 4 mosfet for DC motor , i control bridge througt MC in pwm and receive encoder A-B signal from axis'motor , now the noise of 25khz disturb too much the encoder's signal and software PID go-out , what must i connect on bridge to protect encoder's signals? thankyou
 

Re: Noise on BRIDGE

You can use 40106 schmitt trigger between encoder and microcontroller
You have to add pull- up resistors to encoder outputs.
 

Noise on BRIDGE

I have had to put fast photocoupler to 2 pwm lines and to separate power supply and ground lines..now ther's no problems.
 

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