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A Correlation-Based Background Error Estimation Technique for Bandpass Delta–Sigma ADC DACs

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4 Author(s)
Witte, P. ; Inst. of Microelectron., Univ. of Ulm, Ulm, Germany ; Kauffman, J.G. ; Becker, J. ; Ortmanns, M.

This brief presents a background digital-to-analog converter (DAC) error estimation technique for multibit bandpass Delta-Sigma analog-to-digital converters (ΔΣ ADCs). The technique is used to estimate and linearize the intrinsic mismatches of feedback DAC unit elements of ΔΣ ADCs. It consists of three building blocks, namely, a correlation-based error estimation, which utilizes a test signal to estimate DAC unit element gain mis matches; a digital error correction, which corrects the estimated DAC nonlinearities; and a unit establishing background operation. The method has been successfully utilized for lowpass ΔΣ ADCs and is extended here by using an additional bandpass filter to create a modified test signal, which meets the requirements of bandpass Δ modulators. The method restores highly nonlinear systems back to their ideal linearity while requiring only little additional hardware effort and enables the design of linear multibit bandpass ΔΣ modulators.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:58 ,  Issue: 11 )