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  1. #1
    Newbie level 5
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    high voltage pump design

    hi all
    i have design a dickson pump for high voltage, which input is 1.8v, and output is 20v. but the ripple of output is bigger than 100mv, how i can make it small than 50mv.

    thanks everyone

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  2. #2
    Advanced Member level 5
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    Re: high voltage pump design

    I got a patent on a polyphase pump which in silicon (SOI)
    made 70V off 3.3V with almost invisible ripple. At 1.8V you
    really want synchronous switches instead of diodes (I found
    low-VT (between regular and "zero" / native) held the best
    compromise between forward pumping voltage efficiency
    (Vdd-VT) and leak-back (VT and subthreshold slope).

    Not a Dickson implementation per se; that's where I
    started but at the high stage count it became clear that
    a different topology was wanted. Dickson pumps pay too
    high a "tax" when drive levels approach rectifier forward
    voltage.

    If you want to play with the idea, it'll probably work for you
    (in the end; some engineering required). If you want to put
    it in a product for sale, expect to hear from my former
    employer's lawyers.



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