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The RICOCHET reactor neutrino observatory is planned to be installed at theLaue Langevin Institute (ILL) starting mid-2022. Its scientific goal is toperform a low-energy and high precision measurement of the coherent elasticneutrino-nucleus scattering (CE$\nu$NS) spectrum in order to explore exoticphysics scenarios. RICOCHET will host two cryogenic detector arrays: theCryoCube (Ge target) and the Q-ARRAY (Zn target), operated at 10 mK. The 1 kgGe CryoCube will consist of 27 Ge crystals instrumented with NTD-Ge thermalsensors and charge collection electrodes for a simultaneous heat and ionizationreadout to reject the electromagnetic backgrounds (gamma, beta, x-rays). Wepresent the status of its front-end electronics. The first stage ofamplification is made of High Electron Mobility Transistor (HEMT) developed byCNRS/C2N laboratory, optimized to achieve ultra-low noise performance at 1Kwith a dissipation as low as 15 $\mu$W per channel. Our noise model predictsthat 10 eV heat and 20 eVee RMS baseline resolutions are feasible with a highdynamic range for the deposited energy (up to 10 MeV) thanks to loopamplification schemes. Such resolutions are mandatory to have a highdiscrimination power between nuclear and electron recoils at the lowestenergies.

HEMT-based 1K front-end electronics for the heat and ionization Ge CryoCube of the future RICOCHET CE$\nu$NS experiment