An OTA-based CMOS bandpass filter for NMR applications

作者：Shesharaman K N^*; Kittur Harish M

来源：International Journal of Electronics, 2012, 99(12): 1635-1649.

DOI：10.1080/00207217.2012.680793

• nuclear magnetic resonance
• magnetic resonance imaging
• bandpass filter
• operational transconductance amplifier
• CMOS

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 x 33.125 mu m(2) and consumes 0.165 mW of power from a 1.5 V supply.

• 出版日期2012