An OTA-based CMOS bandpass filter for NMR applications |
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Authors: | K.N. Shesharaman Harish M. Kittur |
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Affiliation: | 1. School of Electronics Engineering , VIT University , Vellore 632014 , Tamilnadu , India knshesharaman@gmail.com;3. School of Electronics Engineering , VIT University , Vellore 632014 , Tamilnadu , India |
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Abstract: | One of the very popular medical imaging techniques used in present-day radiology is the magnetic resonance imaging (MRI) which is based on the phenomenon of nuclear magnetic resonance (NMR) in the hydrogen atoms present in the body. There is ever-increasing research in electronic circuit design for biomedical applications using NMR. Earlier magnetic resonance imagers operated at a magnetic field strength of 0.3?T. The present imagers operate at a magnetic field of 1.5?T, the resonance frequency of the nuclei being 64?MHz. This article presents a CMOS bandpass filter (BPF) design for NMR applications. The overall BPF design is realised in 180?nm CMOS technology which occupies an active area of 24.23?×?33.125?µm2 and consumes 0.165?mW of power from a 1.5?V supply. |
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Keywords: | nuclear magnetic resonance magnetic resonance imaging bandpass filter operational transconductance amplifier CMOS |
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