Monolithic low-noise amplifier with externally matched input port for liquid helium temperature zone

Abstract

The invention relates to a single-chip low-noise amplifier with an externally matched input port for a liquid helium temperature zone. The single-chip low-noise amplifier comprises an input end matching circuit and a broadband single-chip low-noise amplifying circuit. The input end matching circuit is in cascade connection with the single-chip low-noise amplification circuit, and an input port ofthe single-chip amplification circuit is matched mainly through capacitors C1 and C2, an inductor L1 and a resistor R1, so that the noise, port return loss and other performance of the amplifier are optimized. The single-chip low-noise amplification circuit comprises a three-level strain high-electron-mobility transistor, a matching circuit and a biasing circuit. The invention can be stably applied to an ultralow-temperature liquid helium temperature zone; within the broadband range of 2 GHz to 15 GHz, the gain is larger than 32 dB, the noise temperature is smaller than 10 K, more excellent narrowband performance can be achieved by changing an external input end matching circuit, and the invention has the advantages of being low in noise, small in size, convenient to match and the like andcan be applied to receiving systems in the fields of deep space exploration, radio astronomy and the like.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to a monolithic low-noise amplifier with an externally matched input port for a liquid helium temperature zone. Background technique [0002] The sensitivity of the receiver system is limited by the system noise, and the system noise is determined by the noise of the device used and the background noise of the environment. In general microwave receiving systems, the requirements for noise indicators are not very high, and conventional microwave amplifiers can meet their requirements. , but for systems such as radio astronomy, deep space exploration, and low-temperature physics, the background noise of the received signal is only a few K. In this case, the noise requirements of the system itself are very strict. Cooling the receiver front-end minimizes the noise generated by the device in order to achieve the best performance of the receiver system. [0003] The strained h...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a monolithic low-noise amplifier with an externally matched input port in the liquid helium temperature zone, which can solve the needs of wideband low-noise amplifiers in the fields of radio astronomy, deep space detection, and low-temperature physics. At the same time, the externally matched input port The circuit can be optimized and adjusted according to the actual frequency band to maximize the use range of the amplifier

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