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help in looping - Dual slope adc

Discussion in 'General Electronics Discussion' started by sdw26, Dec 5, 2010.

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  1. sdw26

    sdw26

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    Dec 5, 2010
    (i have posted this on another forum section too, i wasnt sure which forum would be right for this, even though this is a project)

    I'm working on a project where i have to build a 4 bit dual slope adc.
    So far i have figured out everything but looping it...

    I have attached what i ve done so far for generating the pulse and connecting the binary counter and decoder and getting out the digital output through a 7segment display.
    (input to the clamp comes from the comparator)

    i need to loop this now.. like back and forth from v ref to v in.
    and the worst part is, i have to use bjt as a switch and/or comparators to loop it.

    If i am right-- the logic goes like this:
    if you get 1111 out of the binary counter, then you want to switch to v ref--
    therefore i get v ref from the capacitor discharge. Ones the capacitor has fully discharged, the number left in the 7segment display is the digital output. at this point v ref is 0, therefore i have to switch back to v in, and so on it loops...

    i am utterly confused with this looping.. i can get an and gate to tell me if all are 1s in the output of my binary counter.. but then what..? i can get the discharge of the capacitor as v ref through a bjt then what..? how will i connect the dots..?
    help me!!

    Thank you.
    Sean
     

    Attached Files:

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