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I want to implement Sigma Delta ADC on Altera DE1, i wrote the code and run on QuartusII; now i want to know
is it possible to connect the analog input directly to the board?
as in my code the input is introduced as signed [7:0]
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I don't understand the question. A SD ADC would preferably use a 1-bit modulator. Multibit modulators are a principle option in SD design, but they need digital correction and a multibit ADC and DAC to take advantage of the SD principle. See Chapter 8 of
delta-sigma data converters, theory, design and simulation, by Schreier et al. I don't believe that you intend to design an analog frontend of similar complexity.
I have seen FPGA evaluation boards (from Altera competitors, if I remember right) with a basic first order SD modulator comprised of a RC lowpass and a comparator. The comparator might be even replaced by a LVDS input stage.
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