Fully integrated signal conditioning of an accelerometer for implantable pacemakers |
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Authors: | Alfredo Arnaud Carlos Galup-Montoro |
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Affiliation: | (1) DIE, Facultad de Ingeniería y Tecnologías, Universidad Católica, Av. 8 de Octubre 2738, Montevideo, Uruguay, CP 11800;(2) LCI, Departamento de Engenharia Elétrica, Universidade Federal de Santa, Catarina, Brazil |
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Abstract: | This paper shows the development of a fully integrated G m -C 0.5–7 Hz bandpass amplifier (gain G = 400), for a piezoelectric accelerometer to be employed in rate adaptive pacemakers. The circuit, fabricated in a standard 0.8 micron CMOS technology, operates with a power supply as low as 2 V, consumes 230 nA of current, and has only a 2.1 μVrms input referred noise. Detailed circuit specifications, measurements, and a system performance comparative analysis are presented. The physical activity system includes a fully integrated G m -C rectifier and 3-second time average. Fully integrated very low frequency circuits were implemented with the aid of series-parallel current division in symmetrical OTAs. OTAs as low as 33 pS (equivalent to a 30 GΩ resistor) were designed, fabricated, and tested. |
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Keywords: | Low power design CMOS analog integrated circuits Sensors Bandpass filters Cardiac pacemaker |
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