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switching with micro controller

Hi

I WANT SWITCH   A  MOSFET  WITH A  MICRO CONTROLLER PWM  WITH 100HZ FREQUENCY OF SWITCHING .  .

I WANT ISOLATE AN AREA OF CIRCUIT   FROM  OTHER AREA WITH  MOSFET.

THIS MOSFET PASS 3 MICRO  VOLTS IN ON STATE .

MY UC WORK WITH 100MHZ CLOCK.

WHEN MOSFET  GO  ON STATE  WITH  MICRO CONTROLLER  PWM  ,100MHZ  NOISE  APPEAR ON GATE OF  MOSFET. AND INJECTED  TO  PRECISION  SIGNAL.

I NEED A FILTER FOR THIS NOISE FOR REMOVING NOISE FROM GATE .THIS FILTER CAN BE SIMPLE  RC FILTER  OR  OPTOCOUPLER .

PLEASE HELP FOR SOLVE THIS ISSUE.

SINCERELY