vivkr
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Hi Jerry, CMOSSolutions,
Unfortunately, I have no inductors available. In fact, I would be lucky if I can get a small external cap.
Cascaded charge pumps work ok even for higher voltages, but only as long as I am drawing no net current (charging up some small capacitors once), as I already mentioned.As soon as one needs to do some sort of load switching, such as charging up a large capacitive load regularly, then there is trouble with these.
That's why I wanted to know if anyone knows of a good method to build charge pumps to push up the voltage to an arbitrarily high value (breakdown effects permitting) and still provide an average current of a few microamperes. And all this while working off a 4 V supply.
The only "reliable" solution I could think of was to use a string of Dixon stages, all drawing their power from the low-voltage supply which can provide this required current and pushing up voltage step by step, all the way to the top, but the area explodes exponentially with this approach, not least because at the high voltage end, each stage is massive in size.
Regards Vivek
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