We have been presented with an engineering problem that we are not sure how to solve: we need to be able to measure high-frequency ripple current (up to several MHz) on a DC power rail that can be anywhere from zero to 500 volts, and get that in a form that can be fed into a logging device. The DC component of the current can be up to 100 amperes. Any engineers here who can give some advice?

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the ideal situation would be a wide-bandwidth current sense amplifier that can withstand high common-mode voltages well above its vcc rail, but I don't know if any such devices exist that can handle 500V common-mode.

the ADuM3190 looks good-ish except that it has a 400kHz bandwidth, and we need more than that >.<

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