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This paper reports an inductorless transimpedance amplifier (TIA) with verycompact size and adequate performance for spin qubit readout operations inmonolithic quantum processors. The TIA has been designed and fabricated in a22nm FDSOI CMOS foundry technology commercially available. The measurementresults show a transimpedance gain of 103 dB{\Omega} with a bandwidth of 13GHz, at room temperature, and it is expected to exhibit slightly superiorperformance at cryogenic temperatures. The power consumption amounts to 4.1 mW.The core area amount to 0.00025 mm2, i.e., about two orders of magnitudesmaller with respect to the prior-art works, and approaching the qubit size,which makes the inductorless TIA a compact enabling solution for monolithicquantum processors.

A Compact TIA in 22nm FDSOI CMOS for Qubit Readout in Monolithic Quantum Processors