I am searching for a good idea to sense the current of 0 to 100 mA at a voltage level of 0V to 135V. The result should be a current to ground or a voltage respecive to ground. The first problem is the high voltage of 135V, the second, that this voltage can be nearly zero as well. I investigated several possibilities already:
As an additional point i have to concider that only little space is left on the pcb.
Does anyone have a (good) idea how to solve the problem?
Since you need the full range from 0 to 130V then the AD629 architecture is the way to go.