A fully integrated IQ-receiver for NMR microscopy.
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.
Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 17, CH-1015 Lausanne, Switzerland. jens.anders@epfl.ch
Jens
J
Anders
Paul
P
SanGiorgio
Giovanni
G
Boero
D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation*; D008280:Magnetics / Q000295:instrumentation*; D008853:Microscopy / Q000295:instrumentation*; D008904:Miniaturization; D012666:Semiconductors; D018511:Systems Integration; D014159:Transducers