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We have developed a nuclear magnetic resonance spectrometer with a seriestuned input circuit for measurements on samples at millikelvin temperaturesbased on an integrated two-stage superconducting quantum interference devicecurrent sensor, with an energy sensitivty e = 26 +/-1 h when operated at 1.4K.To maximise the sensitivity both the NMR pickup coil and tuning capacitor needto be cooled, and the tank circuit parameters should be chosen to equalise thecontributions from circulating current noise and voltage noise in the SQUID. Anoise temperature TN = 7 +/-2 mK was measured, at a frequency of 0.884 MHz,with the circuit parameters close to optimum.

A nuclear magnetic resonance spectrometer for operation around 1 MHz with a sub 10 mK noise temperature based on a two stage dc SQUID