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J Magn Reson. 2011 Mar;209(1):1-7. doi: 10.1016/j.jmr.2010.12.005. Epub 2010 Dec 19.

A fully integrated IQ-receiver for NMR microscopy.

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Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 17, CH-1015 Lausanne, Switzerland.


We present a fully integrated CMOS receiver for micro-magnetic resonance imaging together with a custom-made micro-gradient system. The receiver is designed for an operating frequency of 300 MHz. The chip consists of an on-chip detection coil and tuning capacitor as well as a low-noise amplifier and a quadrature downconversion mixer with corresponding low-frequency amplification stages. The design is realized in a 0.13 μm CMOS technology, it occupies a chip area of 950 × 800 μm² and it draws 50 mA from a supply voltage of 1.8 V. The achieved time-domain spin sensitivity is 5×10(14)spins/Hz. Images of phantoms obtained in our custom-made gradient system with 8 μm isotropic resolution are reported.

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