Details

Autor(en) / Beteiligte

• Ramos, J
• Ausín, J L
• Duque-Carrillo, J F
• Torelli, G

Titel

Design of limiting/logarithmic amplifier for wideband bioimpedance measuring devices

Ist Teil von

• 2010 Biomedical Circuits and Systems Conference (BioCAS), 2010, p.290-293

Ort / Verlag

IEEE

Erscheinungsjahr

2010

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• 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.