A Generic Foreground Calibration Algorithm for ADCs with Nonlinear Impairments

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Title: A Generic Foreground Calibration Algorithm for ADCs with Nonlinear Impairments
Authors: Salib, ArmiaFlanagan, Mark F.Cardiff, Barry
Permanent link: http://hdl.handle.net/10197/11129
Date: May-2018
Online since: 2019-10-08T14:20:53Z
Abstract: This paper presents a generic foreground calibration algorithm that estimates and corrects memoryless nonlinear impairments in both single channel and time-interleaved analog-to-digital converters (TIADCs), and which is capable of correcting for amplifier nonlinearity, comparator offsets, and capacitance mismatch for each channel. It operates by generating, and then using, a look-up table which maps raw ADC output decision vectors to linearized output. For TIADCs, the algorithm also uses information gained during the calibration phase to estimate timing and gain mismatches among the sub-ADCs. The problem of selecting an appropriate timing reference so as to relax the requirements on the time-skew correction circuitry is statistically analyzed, as is the corresponding impact on manufacturing yield. Accordingly, a new method is proposed having superior performance; for example, in the case of an eight sub-ADC TIADC system, the proposed scheme reduces the time skew correction requirement by 44% compared with conventional methods. The architecture is instrumented with some additional circuitry to facilitate built-in self-test, allowing manufacturing test time and cost reductions. Implementation aspects are discussed, and several complexity reduction techniques are presented along with synthesis results from a Verilog implementation of the calibration engine.
Funding Details: European Commission Horizon 2020
Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Volume: 66
Issue: 5
Start page: 1874
End page: 1885
Copyright (published version): 2018 IEEE
Keywords: ADCTransfer functionForegroundCalibrationNonlinearityTIADCBISTBandwidth mismatch
DOI: 10.1109/TCSI.2018.2870529
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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