A low‐power,area‐efficient multichannel receiver for micro MRI |
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| Authors: | Fahimeh Dehkhoda Javad Frounchi Said Al‐Sarawi |
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| Affiliation: | 1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran;2. Center for Biomedical Engineering (CBME), School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA, Australia |
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| Abstract: | A new integrated, low‐noise, low‐power, and area‐efficient multichannel receiver for magnetic resonance imaging (MRI) is described. The proposed receiver presents an alternative technique to overcome the use of multiple receiver front‐ends in parallel MRI. The receiver consists of three main stages: low‐noise pre‐amplifier, quadrature down‐converter, and a band pass filter (BPF). These components are used to receive the nuclear magnetic resonance signals from a 3 × 3 array of micro coils. These signals are combined using frequency domain multiplexing (FDM) method in the pre‐amplifier and BPF stages, then amplified and filtered to remove any out‐of‐band noise before providing it to an analog‐to‐digital converter at the low intermediate frequency stage. The receiver is designed using a 90 nm CMOS technology to operate at the main B0 magnetic field of 9.4 T, which corresponds to 400 MHz. The receiver has an input referred noise voltage of 1.1 nV/√Hz, a total voltage gain of 87 dB, a power consumption of 69 mA from a 1 V supply voltage, and an area of 305 µm × 530 µm including the reference current and bias voltage circuits. Copyright © 2013 John Wiley & Sons, Ltd. |
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| Keywords: | micro magnetic resonance imaging (MRI) parallel MRI multichannel receiver coil array |
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