Publicação
Sigma-delta analog to digital converter for use in lab-on-a-chip devices for biochemical clinical analyses
| Resumo: | This paper describes a sigma-delta analog to digital converter, which was designed for use in lab-on-a-chip devices, especially in low-cost measurement of biochemical substances in biological fluids by spectrophotometric analysis. The optical sensors were integrated in the same fabrication CMOS process with the analog to digital converters, which are based on sigma-delta modulators. Signals proportional to the intensity of the transmitted light through the biological fluids, which are proportional to the biochemical substance concentration, are available at the output in the form of bit streams allowing simple computer interfacing. Although the sigma-delta converters designed for this project have a very simple architecture, they have other advantages relatively to other interfacing devices used with the same purpose, namely, the noise that is integrated with the signal and then digitally filtered, which means that, except for its small quantity in the signal band, it is eliminated by the device. |
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| Autores principais: | Minas, Graça |
| Outros Autores: | Rocha, J. G. |
| Assunto: | Sigma-Delta Lab-on-a-chip |
| Ano: | 2006 |
| País: | Portugal |
| Tipo de documento: | comunicação em conferência |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | This paper describes a sigma-delta analog to digital converter, which was designed for use in lab-on-a-chip devices, especially in low-cost measurement of biochemical substances in biological fluids by spectrophotometric analysis. The optical sensors were integrated in the same fabrication CMOS process with the analog to digital converters, which are based on sigma-delta modulators. Signals proportional to the intensity of the transmitted light through the biological fluids, which are proportional to the biochemical substance concentration, are available at the output in the form of bit streams allowing simple computer interfacing. Although the sigma-delta converters designed for this project have a very simple architecture, they have other advantages relatively to other interfacing devices used with the same purpose, namely, the noise that is integrated with the signal and then digitally filtered, which means that, except for its small quantity in the signal band, it is eliminated by the device. |
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