A New Current Calibration Scheme Suitable for Generic DAC Architectures

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Samenvatting

This paper presents a new start-up calibration method and algorithm for current-steering D/A converters. The method extends the ideas presented in [1] and the proposed current cell allows its application on generic DAC architectures, i.e. binary, thermometer, segmented. With respect to the thermometer type implementations, the binary implementations are area efficient and the calibration may even further reduce their size. Unlike the thermometer converters, which use identical currents, the binary converters are problematic for calibration at the level of current sources due to the different weights of their current sources. A new transistor level architecture for scaled current cells is proposed. It uses a set of parallel calibrated unit elements to construct a signal current source. When after the calibration, these are assembled back, the accuracy of the current sources is improved. Moreover, the method is independent from the architecture of the converter. Therefore, for all current-steering DAC architectures, an optimal area solution through optimising the calibration strength exists. Further, the paper analyses the start-up calibration requirements for generic DAC architectures. It offers a tool to estimate the calibration strength for an optimal area solution. An example of a 12-bit self-calibrated DAC, a high-level model and simulations verify the presented and analysed method. A general discussion on the advantages and constraints of the new calibration method is offered and conclusions are drawn.
Originele taal-2Engels
TitelProceedings of the 15th ProRISC, Annual Workshop on Circuits, Systems and Signal Processing (ProRISC 2004) 25 - 26 November 2004, Veldhoven, the Netherlands
Plaats van productieUtrecht, the Netherlands
UitgeverijSTW Technology Foundation
Pagina's577-584
ISBN van geprinte versie90-73461-43-X
StatusGepubliceerd - 2004
Evenement2004 Annual Workshop on Circuits, Systems and Signal Processing (ProRISC 2004) - Veldhoven, Nederland
Duur: 25 nov 200426 nov 2004

Congres

Congres2004 Annual Workshop on Circuits, Systems and Signal Processing (ProRISC 2004)
Verkorte titelProRISC 2004
LandNederland
StadVeldhoven
Periode25/11/0426/11/04
AnderProRISC 2004, Veldhoven, the Netherlands

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Citeer dit

Radulov, G. I., Hegt, J. A., Quinn, P. J., & Roermund, van, A. H. M. (2004). A New Current Calibration Scheme Suitable for Generic DAC Architectures. In Proceedings of the 15th ProRISC, Annual Workshop on Circuits, Systems and Signal Processing (ProRISC 2004) 25 - 26 November 2004, Veldhoven, the Netherlands (blz. 577-584). Utrecht, the Netherlands: STW Technology Foundation.