Design of cryogenic LNA at 0.01 to 2 GHz based on silicon-germanium technology
A low-frequency and ultra-wideband low-noise amplifier(LNA)is one of the core components in low-tem-perature superconducting testing systems.In this study,a cryogenic LNA at 0.01 to 2 GHz was designed through the design of a resistive negative feedback circuit and was fabricated using a SiGe heterojunction bipolar transistor and a two-stage amplifier cir-cuit with single power supply.The gain of LNA is over 33 dB,with input and output return losses being less than-10 dB.At 15 K,the average noise temperature is 10 K,the power consumption is 15 mW.The LNA was applied in low temperature super-conducting testing systems with improving the sensitivity and efficiency of the system.
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