Quadrature Mismatch Shaping with a Complex, Data Directed Swapper

Quadrature bandpass (QBP) ΣΔ ADCs require a feedback path for both the I and the Q part of the complex feedback signal. A complex DAC could give this feedback with near-perfect I/Q balance. Still, the mismatch between the unit elements of the complex DAC introduces mismatch noise that should be shap...

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Bibliographic Details
Published in2006 13th IEEE International Conference on Electronics, Circuits and Systems pp. 46 - 49
Main Authors Reekmans, S., Catteau, B., Rombouts, P., Weyten, L.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2006
Subjects
Analog-digital conversion
Bandwidth
Digital modulation
Feedback
Hardware
Information systems
Logic
Multi-stage noise shaping
Noise shaping
Quantization
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Summary:Quadrature bandpass (QBP) ΣΔ ADCs require a feedback path for both the I and the Q part of the complex feedback signal. A complex DAC could give this feedback with near-perfect I/Q balance. Still, the mismatch between the unit elements of the complex DAC introduces mismatch noise that should be shaped out of the signal band with dynamic element-matching (DEM) techniques. To select the unit DAC elements of the complex multibit DAC, the well-known data directed swapper is generalized towards a complex structure and the necessary constraints for its correct functioning are derived. Additionally, a hardware efficient structure is presented: the reduced butterfly shuffler. Here, some of the QBP swapper cells are replaced by bandpass (BP) swapper cells. Also, great attention is paid to the interconnection pattern of the data directed swapper to prevent instability.
ISBN:9781424403943
1424403944
DOI:10.1109/ICECS.2006.379697