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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2649| CMOS Circuit Design for Bio-Impedance Spectroscopy Applications | |
| Joselyn Mayte Fernandez Martinez | |
| Wilfrido Calleja Arriaga Alejandro Diaz-Sanchez | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Bio-Impedance Spectroscopy Analysis QFGT-modified ring oscillators Direct Digital Synthesizer Instrumentation Amplifier | |
| The analysis of bioimpedance spectroscopy (BIS) is based on measuring the passive electrical properties of biological tissues and their frequency-dependent response to alternating current. This non-invasive characterization technique has become a fundamental tool for obtaining diagnostic information about the physiological properties of the human body. The non-invasiveness, continuous monitoring capability, portability, and versatility of BIS systems have become increasingly relevant in the development of new healthy applications and measurement techniques. Additionally, the advancements in CMOS technology, these factors highlight the need to optimize analog and digital blocks to enable precise voltage measurements across a broad frequency range while meeting requirements for noise, power consumption, and area efficiency in both front-end and back-end stages. This work presents proposed analog and digital blocks for BIS applications designed using UMC 180nm technology. For signal generation in the backend stage, a QFGT-modified ring oscillator topology operating in weak inversion is proposed to generate kilohertz-range signals. The oscillator incorporates dual control mechanisms: one based on a feedback factor, β, and other based on a tuning voltage, VT une . As an digital alternative, a Direct Digital Synthesizer (DDS) with signal compression is introduced, reducing the memory consumption of the ROM used to store the discretized sine wave. Finally, the design of a front-end signal conditioning circuit is presented, comprising and high-performance instrumentation amplifier with a gain range of 26–76 dB and an associated CMRR of 130–189 dB. | |
| Instituto Nacional de Astrofísica, Óptica y Electrónica | |
| 2024-11 | |
| Tesis de maestría | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| Fernández Martínez, J. M., (2024), CMOS Circuit Design for Bio-Impedance Spectroscopy Applications, Tesis de Maestría, Instituto Nacional de Astrofísica, Óptica y Electrónica. | |
| ELECTRÓNICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Maestría en Electrónica |
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| Fichero | Tamaño | Formato | |
|---|---|---|---|
| FERNANDEZMJM_ME.pdf | 4.5 MB | Adobe PDF | Visualizar/Abrir |