A transistor-only switched current sigma-delta A/D converter for a CMOS speech CODEC

This paper describes the design and measurement results of a 1-b A/D converter based on a transistor-only switched current (SI) second-order sigma-delta modulator. The 1-b A/D converter was simulated and processed in ES2 1.5 /spl mu/m CMOS technology. The second-order filter is based on class AB swi...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1995-07, Vol.30 (7), p.819-822
Main Authors: Nedved, J., Vanneuville, J., Gevaert, D., Sevenhans, J.
Format: Article
Language:English
Subjects:
Applied sciences
CMOS process
CMOS technology
Current measurement
Delta-sigma modulation
Distortion measurement
Electronics
Exact sciences and technology
Filters
Integrated circuit measurements
Integrated circuits
Integrated circuits by function (including memories and processors)
Performance evaluation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silicon
Switching converters
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Summary:This paper describes the design and measurement results of a 1-b A/D converter based on a transistor-only switched current (SI) second-order sigma-delta modulator. The 1-b A/D converter was simulated and processed in ES2 1.5 /spl mu/m CMOS technology. The second-order filter is based on class AB switched current-integrators. The analog current memory cells in the integrator are optimized for linear operation with a strong class AB overlap region to avoid class B operation and cross-over distortion. Measurement results on the first silicon performing 11-b resolution show that this circuit technique is promising for speech CODEC A/D conversion.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.391123