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  1. #1
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    nano ampere meter

    dear friends
    i want to design an digital ampere meter with following specification:

    digital nano ammeter ( 1 - 999 nA)
    pico Ammeter (1-999 pA),


    i will be using lcd display and 89c51 microcontroller.
    please any body help me out for how to design it.

    byee
    lats

    •   Alt27th October 2005, 15:14

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  2. #2
    VVV
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    pico ampere meter

    I think you should use an analog front-end, followed by and A/D.
    Take a look at appnote AN-242 from National.
    You can probably adapt circuits of figures 11, 12, or 14. Use their output to drive the A/D.

    www.national.com/an/AN/AN-242.pdf#page=6



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