mosfet driver and Vgs problem

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i am using Ir2112 to drive mosfet, i measured between Ho and Vs which is (Vgs ) and it was 12 volt but the signal wasn't pure square there were a little Curvature in the up side and low side of the pulse . i don't know if this curvature is normal or i can enhance the circuit performance to get it pure square .I sent you the complete circuit for dc-dc buck converter which is drived by micro controller , i attached the a picture for the wave
 

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I assume a measurement artefact. Vs is floating with respect to circuit ground, you need a differential probe to measure it fairly undistorted.
 

what do you mean by differential probe ? I created this circuit on test board, what should i do ?
 

Having a distorted sine wave might as well mean there could be ringing in gate driving circuit. Have you checked value of gate resistance properly?
 

abhikuvar said:
Having a distorted sine wave might as well mean there could be ringing in gate driving circuit. Have you checked value of gate resistance properly?
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the value of gate resistance is 22 ohm and a 2 K ohm resistance from gate to source . this is pwm signal and it is good when i measured it from Ho to ground
 

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