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switching loading of voltage regulator

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Vitamin-C

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I got a problem the voltage regulator (on chip) when loading is switching with a high frequency loading say around 20MHz, the voltage drops 30% the original value.
I checked the average current is still within design spec. and I have add external capacitance 1uF and there is no improvement.

Anyone will help me out on this issue
 

If the switching introduce a 20MHz harmonic at the regulator output I guess that the regulation amplifier shift the operating point. Thta happen because of rectification effects somewhere in the regulation loop.

Use a filter which reduce the 20MHz ripple to the regulator but make a dimension which introduce less than 10° phase margin impact.
 

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