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Switched current sigma-delta A/D converter for a CMOS subscriber line analog front end

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4 Author(s)
D. Gevaert ; Dept. of Microelectron., KIHWV-Oostende, Belgium ; J. Vanneuville ; J. Nedved ; J. Sevenhans

This paper describes the design and testing of a 1-bit A/D converter based on the sigma-delta modulation principle. Unlike the conventional realisations using the switched capacitor approach, the current switching technique uses the current level as a variable. In order to check the feasibility and advantages of this technique, a first order 1-bit A/D converter and a second order 1-bit A/D converter were designed. In the first order 1-bit A/D converter a time-continuous current-integrator is used as filter. The circuit has been designed realised and tested. In the second order 1-bit A/D converter the filter is based on the analog sampling and processing of a current signal. The second order filter is implemented with class AB switched current memory cells. The design has been simulated and processed in ES2 1.5 μm CMOS technology

Published in:

European Design and Test Conference, 1994. EDAC, The European Conference on Design Automation. ETC European Test Conference. EUROASIC, The European Event in ASIC Design, Proceedings.

Date of Conference:

28 Feb-3 Mar 1994