| 摘要 |
A noise shaping modulator for use in sigma delta modulation data conversion has two or more cascaded quantization loops. A first quantization loop is operated at a first sampling frequency and one or more higher order quantization loops are operated at a second sampling frequency. Due to speed limitations of analog circuitry in the first quantization loop, a significant improvement in signal to noise ratio may be achieved in a sigma delta modulation data converter by selecting the second sampling frequency higher than the first sampling frequency.
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