| 摘要 |
PURPOSE: To provide the method and system to realize A/D conversion of a high resolution. CONSTITUTION: The method for cascade connection of sigma-delta modulators includes a step where inputs E1 , E2 , and E3 of quantizers of modulator stages 12, 14, and 16 are sent to following stages. Consequently, signals sent to following stages are differences between outputs of preceding stages and a quantization noise. This method also includes a step where quantization noises of two first stages are eliminated in the same manner as outputs of two first stages to convert a final output yout of cascaded modulators to a delay version of input and, in addition, a scaled version of the last stage shaped by a fourth order high pass function.
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