Design of Cryogenic Fully Differential Gain Boosting-OTA by the $g_{m}/I_{d}$ methodology used for a 14 bit Pipelined-SAR ADC
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Abstract
—Quantum computing (QC) requires cryogenic elec- tronic circuits as control and readout sub-systems of quantum chips to meet the qubit scale-up challenges.At this temper- ature,MOSFETs transistors exhibition many changes such as higher threshold voltage,higher mobility,and steeper substhresh- old slope.We present a cryogenic fully differential gain boosting-OTA used for a 14 bit Pipelined-SAR ADC operating at 4.2K as the readout circuit for semiconductor-based quantum computing system.Using g m /I d methodology to get pre-computed lookup tables based on the cryogenic 110nm BSIM4 model.The proposed OTA achieves very high unity-gain frequency@1.23GHz and open-loop low frequency gain@101dB.The total power consumption is 2.66mW at 4.2K,and a setting accuracy better than 0.01% with f − 3 dB of 37MHz in a closed-loop application.