| 摘要 |
<p>The invention relates to a method of cascading two or more sigma-delta modulators (A, B) by applying an error signal (-Q1), representing the quantization error of a preceding modulator (A) to a subsequent modulator (B) in the cascade to be quantized therein, the quantized error signal (D2) being thereafter differentiated and subtracted from the quantized output signal (D1) of the preceding modulator (A). To improve the performance of the cascade, the method according to the invention is characterized in that the error signal (-Q1) is scaled before said subsequent modulator (B) by a first factor smaller than 1, and that the quantized error signal (D2) is scaled by a second factor substantially equal to the inverse of the first factor, before being subtracted from the quantized output signal (D1) of said preceding modulator (A).</p> |
