Signal transfer function equalization in multi-stage delta-sigma analog-to-digital converters

    公开(公告)号:US09742426B2

    公开(公告)日:2017-08-22

    申请号:US15359240

    申请日:2016-11-22

    Abstract: Typically, complex systems require a separate and expensive equalizer at the output of an analog-to-digital converter (ADC). Rather than providing a separate equalizer, the effective Signal Transfer Function (STF) of a Multi-stAge noise SHaping (MASH) ADC can be modified by leveraging available digital filtering hardware necessary for quantization noise cancellation. The modification can involves adding calculations in the software previously provided for computing digital quantization noise cancellation filter coefficients, where the calculations are added to take into account equalization as well. As a result, the signal transfer function can be modified to meet ADC or system-level signal-chain specifications without additional equalization hardware. The method is especially attractive for high-speed applications where magnitude and phase responses are more challenging to meet.

    SIGNAL TRANSFER FUNCTION EQUALIZATION IN MULTI-STAGE DELTA-SIGMA ANALOG-TO-DIGITAL CONVERTERS

    公开(公告)号:US20170170841A1

    公开(公告)日:2017-06-15

    申请号:US15359240

    申请日:2016-11-22

    Abstract: Typically, complex systems require a separate and expensive equalizer at the output of an analog-to-digital converter (ADC). Rather than providing a separate equalizer, the effective Signal Transfer Function (STF) of a Multi-stAge noise SHaping (MASH) ADC can be modified by leveraging available digital filtering hardware necessary for quantization noise cancellation. The modification can involves adding calculations in the software previously provided for computing digital quantization noise cancellation filter coefficients, where the calculations are added to take into account equalization as well. As a result, the signal transfer function can be modified to meet ADC or system-level signal-chain specifications without additional equalization hardware. The method is especially attractive for high-speed applications where magnitude and phase responses are more challenging to meet.

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