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The inertial sensor electronics, developed for the space mission LISA Pathfinder, were confronted with the greatest design challenges mostly in the field of low noise at ultra-low frequency not imposed on any electronics before. To maintain the signal integrity the EMC was an important design aspect during the development. Since the noise performance at subHertz frequencies is not specified by the manufacturers of the electronic parts, the existing knowledge in this field is very rare. In this paper, the key technology development is presented for the gravitational waves measurements, which is the ambition of the future space mission LISA. The top level requirements for the inertial sensor LISA and its electronics are described. The presented results from the breadboards of the electronics show the achieved level of performance at 1 mHz frequency and they are original work achieved through a PhD thesis work.