| 摘要 |
A method and system for integrating a mismatch noise shaper into the main loop of a delta-sigma modulator are disclosed. The mismatch noise shaper output is fed back to the summer and is responsive to the mismatch noise shaper. At appropriate times, the mismatch noise shaper selectively overrides the quantizer so that the mismatch noise shaper changes output values of the mismatch noise shaper from values representative of a corresponding output value of the quantizer to other values representative of a different output value of the quantizer. The overriding feature distinguishes the present Invention from a DEM, as the output of a DEM is only a reordering of the same number of elements as its input. The mismatch noise shaper selectively overrides the quantizer when the quantizer output has prevented the mismatch noise shaper from controlling selection of elements at the mismatch noise shaper output for a predetermined time period.
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