Adaptive digital quantization noise cancellation filters for mash ADCs

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United States of America Patent

PATENT NO 9768793
APP PUB NO 20170179969A1
SERIAL NO

15365867

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Abstract

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For continuous-time multi-stage noise shaping analog-to-digital converters (CT MASH ADCs), quantization noise cancellation often requires accurate estimation of transfer functions, e.g., a noise transfer function of the front end modulator and a signal transfer function of the back end modulator. To provide quantization noise cancellation, digital quantization noise cancellation filters adaptively tracks transfer function variations due to integrator gain errors, flash-to-DAC timing errors, as well as the inter-stage gain and timing errors. Tracking the transfer functions is performed through the direct cross-correlation between the injected maximum length linear feedback shift registers (LFSR) sequence and modulator outputs and then corrects these non-ideal effects by accurately modeling the transfer functions with programmable finite impulse response (PFIR) filters.

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  • ANALOG DEVICES GLOBAL

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dong, Yunzhi Weehawken, US 15 163
McCormick, Martin Steven Cambridge, US 4 146
Meng, Qingdong Belmont, US 5 70
Paterson, Donald W Winchester, US 9 150
Schreier, Richard E New Castle, CA 21 189
Shibata, Hajime Toronto, CA 53 429
Silva, Jose Barreiro Bedford, US 8 84
Yang, Wenhua W Lexington, US 15 112
Zhao, Jialin Santa Clara, US 22 128

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