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In this paper we present fully-integrated field probes for real-time trajectory mapping during magnetic resonance imaging (MRI) experiments. The field probes co-integrate an NMR microcoil and the required transceiver electronics on a single ASIC manufactured in a 0.13µm CMOS technology. Thanks to an on-chip PLL, power amplifier and low-IF quadrature receiver, all connections to and from the chip carry...