A Low-Noise Transconductance Amplifier (LNTA) for Cryogenic Applications using CMOS Technology

Quantum computing is the most prominent field in cryogenic applications. And they use room temperature classical electronic controllers for qubit read-out and control, which are bulky and complex, and limit the number of effective qubits to operate. There is a need for a higher level of integration and a large number of qubit operations, so the validation of CMOS technology at cryogenic temperature is required. This paper presents the study of device characteristics and design parameter variation of 180nm NMOS device. Also, the low noise transconductance amplifier is designed and simulated for noise performance at room temperature 300K and at cryogenic temperature 4K. The proposed design shows the noise figure of 5.3 dB and 0.272 dB at 300K and 4K, respectively. Also, it achieves the S21 of 14.4 dB and 17.4 dB at 300K and 4K, respectively with IIP3 of 19.64 dBm at 4K. This opens the scope for designing a CMOS qubit controller at cryogenic temperature in addition to the high level of integration.