arxiveess.SY2026-07-17
A 0.74-mW K$_u$-band Cryogenic SiGe LNA in 130-nm BiCMOS with 14-K Noise Temperature for Scalable Quantum Readout
Xiuhan Chen, Haoling Li, Gun Suer, Leonardo Ranzani, Kin Chung Fong, Aravind Nagulu, et al.
This paper presents a sub-milliwatt K$_u$-band cryogenic low-noise amplifier (LNA) implemented in GlobalFoundries (GF) 130CBIC SiGe BiCMOS, intended for a sub-Kelvin qubit readout chain integrating a JPA and SiGe LNA on the Still stage. The four-stage cascode LNA features balun-c…