A low-power ultra-wideband low-noise amplifier

Abstract

A low-power ultra-wideband low-noise amplifier, the low-noise amplifier adopts a symmetrical structure, including: an enhanced pseudo-high electron mobility transistor as a first-stage amplifier, a current feedback amplifier as a second-stage amplifier, and a balun , where the input signal is amplified by the enhanced pseudo-high electron mobility transistor, the signal is coupled to the current feedback amplifier through AC, the output terminals of the two current feedback amplifiers are respectively connected to the balun, and the balun combines the differential signals is a terminal output, wherein the enhanced pseudo high electron mobility transistor is biased through an operational amplifier. The present invention reduces the impact of the noise of the post-stage amplifier on the noise performance of the entire LNA, greatly reduces the drain current by reducing the gate voltage and increasing the resistance of the drain, and at the same time ensures the dynamic range of the amplifier and the noise of the entire LNA It has been significantly improved, and the power consumption is less than a quarter of LOFAR's LNA.

Description

technical field [0001] The invention belongs to the technical field of space radio telescopes, and in particular relates to a low-power ultra-wideband low-noise amplifier. Background technique [0002] Each opening of a new spectral window over the past half century has revolutionized astronomy, leading to many unexpected discoveries, including those in low-frequency radio in the 1950s and 1960s. Quasars and pulsars, the cosmic microwave background radiation was discovered in the microwave band in the 1960s, X-rays and neutrinos were used for astronomical research in the 1980s and 1990s, etc., which also provide a comprehensive understanding of the universe by observing radiation in the entire electromagnetic spectrum The new physical process of the radio source provides the possibility. The very low frequency band (<30MHz), as one of the last unobserved spectrum windows, has potential scientific discoveries that make it a hot spot in radio astronomy research. However, ...

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Problems solved by technology

In addition, because the antenna structure of LOFAR is simple and cheap, its sensitivity can be improved by increasing the number of antennas, so its noise performance is not the most important consideration

Based on the above reasons, LOFAR's LNA cannot meet the needs of future space low-frequency radio telescopes in terms of power consumption and noise performance, especially in terms of power consumption. The power consumption of its two polarized low-noise amplifiers is as high as 1 watt or more.

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