How to design and make circuits of sigma-delta modulation?

Question

please give me some channel to make realize my question

Answer 1

This explanation is from the link below, which provides a scheme to improve the tracking of S-D modulation. Note that "reference" and "approximated" refer to the same signal, obtained by integrating the DM output. "Delta Modulation (DM) is an analog-to-digital conversion used for transmitting analog signals by simply transmitting the difference of an input signal to a reference signal. This difference, as determined by a comparator, is represented by a "0" or a "1", which in this implementation is 0 V and 3 V respectively. A 0 V comparator output indicates that the input signal is less than the approximated signal, whereas a 3 V output indicates that the input signal is greater than the approximated signal. The reference signal consists of the sum of all previous differences between these two voltage signals."
This of course would be based on constant-interval sampling of the input and constructed signals. So basically all you need is a comparator and an op-amp based integrator, or with more investment, analog-to-digital conversion of the input signal and numeric integration of the comparator pulses.