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Accurate dynamic-feedback CMOS cross-quad suitable for low-voltage operation


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Opened Access Accurate dynamic-feedback CMOS cross-quad suitable for low-voltage operation
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Author: Calvo, Belén
López Martín, Antonio
Ramírez Angulo, Jaime
González Carvajal, Ramón
Department: Universidad de Sevilla. Departamento de Ingeniería Electrónica
Date: 2009
Published in: XXIV Conference on Design of Circuits and Integrated Systems: Zaragoza, 18-20 de noviembre 2009
Document type: Presentation
Abstract: This paper presents the implementation of a crossquad circuit suitable for low-voltage operation. The proposed cell exploits a dynamic positive feedback gm boosting technique to achieve linear voltage-to-current conversion, while it manages to work with low-voltage with no extra bias current and minimal additional hardware. Results for a 0.5 m CMOS implementation supplied at 3 V show a 0.972 % voltage-tocurrent accuracy, improving the 0.867 % accuracy of a previously reported cross-quad topology also suitable for lowvoltage operation which is based on folded transistors.
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