Sigma Delta ADC

Discussion in 'Feedback and Suggestions' started by flo, Mar 25, 2004.

  1. flo

    Thread Starter New Member

    Mar 25, 2004
    3
    0
    I was wondering. Isn't there something wrong with the output pattern pictures of the Sigma Delta ADC ? The figures show the integrator ramping up and down a black line (Vin ?) at a constant slope but shouldn't it be ramping up and down around 0V with a different rising and falling slope acording to the input voltage ?

    Thanks
     
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  3. Dcrunkilton

    E-book Co-ordinator

    Jul 31, 2004
    416
    11
    If I overlay the integrator waveforms for all three figures, it is possible to see that the ramp slope increases slightly with a larger magnitude negative input voltage. See attached deltasigma.png image.
     
  4. Dcrunkilton

    E-book Co-ordinator

    Jul 31, 2004
    416
    11
    I think that either input will work, if we can find the circuit for a non-inverting integrator. I think that the + OP amp input would have a resistor in series between the input signal and the + OPA terminal and also a resistor from +OPA to ground. Although, I am not sure.
     
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