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Analog and RF mixed-signal cryogenic-CMOS circuits with ultra-high gain-bandwidth product can address a range of applications such as interface circuits between Superconducting Single-flux Quantum (SFQ) logic and cryo-DRAM memory, circuits for sensing and controlling qubits faster than their de-coherence time for at-scale quantum processor. In this work, we evaluate RF performance of 18nm gate length (LG) FDSOI NMOS and PMOS from 300K to 5.5K operating temperature. We experimentally demonstrate extrapolated peak unity current-gain cutoff frequency (fT) of 495/337 GHz (1.35x /1.25x gain over 300K) and peak maximum oscillation frequency (fMAX) of 497/372 GHz (1.3x gain) for NMOS/PMOS, respectively, at 5.5 K. A small-signal equivalent model is developed to enable design-space exploration of RF circuits at cryogenic temperature and identify the temperature-dependent and temperatureinvariant components of the extrinsic and the intrinsic FET. Finally, performance benchmarking reveals that 22nm FDSOI cryogenic RF CMOS provides a viable option for achieving superior analog performance with giga-scale transistor integration density.

Reversible Logic is gaining significant consideration as the potential logic design style for implementationin modern nanotechnology and quantum computing with minimal impact on physical entropy .FaultTolerant reversible logic is one class of reversible logic that maintain the parity of the input and theoutputs. Significant contributions have been made in the literature towards the design of fault tolerantreversible logic gate structures and arithmetic units, however, there are not many efforts directed towardsthe design of fault tolerant reversible ALUs. Arithmetic Logic Unit (ALU) is the prime performing unit inany computing device and it has to be made fault tolerant. In this paper we aim to design one such faulttolerant reversible ALU that is constructed using parity preserving reversible logic gates. The designedALU can generate up to seven Arithmetic operations and four logical operations

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