| 摘要 |
A sigma delta modulator (SDM) data converter system is provided. The SDM data converter system comprises a signal path, a feedback signal path, and a multi-bit quantizer disposed in a feedforward path. The signal path receives an input signal to be processed. The feedback signal path provides a feedback signal that is subtracted from the input signal. The multi-bit quantizer is disposed in the feedforward path so as to receive the input signal after the feedback signal has been subtracted from it. Te multi-bit quantizer uses feedforward dynamic element matching (DEM) to spectrally shape mismatch errors in the SDM data conversion system and produce an output signal, wherein the output signal of the multi-bit quantizer is used for at least a portion of the feedback signal.
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