Design of limiting/logarithmic amplifier for wideband bioimpedance measuring devices
- 1 November 2010
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE) in 2010 Biomedical Circuits and Systems Conference (BioCAS)
Abstract
In this paper, a limiting/logarithmic amplifier (LLA) for high dynamic range wideband bioelectrical impedance measurements is presented. The amplifier is composed of eight cascaded gain stages with a folded diode-connected transistor as a load that attain wide bandwidth performance with limited power consumption. The logarithmic conversion of the input variable is carried out with the aid of nine detectors. A prototype in standard 0.35-μm CMOS technology occupies 0.06 mm 2 of silicon area and dissipates 2.2 mW from a single 2-V supply. Post-layout results show that the LLA is capable of processing a 65-dB input dynamic range over a frequency interval from 1 kHz to 1 MHz with an accuracy within ± 0.7 dB.Keywords
This publication has 7 references indexed in Scilit:
- An analog front-end enables electrical impedance spectroscopy system on-chip for biomedical applicationsPhysiological Measurement, 2008
- Optimal electrode placement and frequency range selection for the detection of lung water using Bioimpedance Spectroscopy2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2007
- Design and preliminary evaluation of a portable device for the measurement of bioimpedance spectroscopyPhysiological Measurement, 2006
- Skin Cancer Identification Using Multifrequency Electrical Impedance—A Potential Screening ToolIEEE Transactions on Biomedical Engineering, 2004
- A 2-V 10.7-MHz CMOS limiting amplifier/RSSIIEEE Journal of Solid-State Circuits, 2000
- Gigahertz-band high-gain low-noise AGC amplifiers in fine-line NMOSIEEE Journal of Solid-State Circuits, 1987
- A true logarithmic amplifier for radar IF applicationsIEEE Journal of Solid-State Circuits, 1980