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Sigma-delta ACD has two main parts: analog modulator and digital filter, the performance of modulator determines the performance of sigma-delta ADC, so the design of modulator is very important. The paper introduces the principle of sigma-delta AD modulator with high accuracy and the applied over sampling technique, noise shaping technique and multi-bit quantizer technique. Determining the design scheme of modulator-three bits three orders CIFF(Cascade of integrators, feed forward form)doi:10.14257/ijsip.2013.6.5.24 fatcat:2zjasc7hsnd27c4dgnqm3ukvo4