Terahertz heterodyne array receiver bias multiplexing device

Abstract

The invention discloses a terahertz heterodyne array receiver bias reuse device comprising a parallel resistor R3 which is used for realizing unified biasing of all frequency mixers; sampling resistors R4 which are connected in series with the frequency mixers and realize monitoring of current of the frequency mixers; Bias-Ts which realize DC biasing of the frequency mixers and coupling of intermediate frequency signals and also realize intermediate frequency isolation of the multiple frequency mixers through electric inductors; and a T-shaped filter circuit which is used for realizing electrostatic protection and anti-interference of the frequency mixers. The total number of leads is reduced to 2N+2 from 6N so that complexity of the system can be reduced, and the requirements for refrigerating power of a refrigerating machine can be reduced.

Description

Technical field [0001] The invention relates to an offset multiplexing device, in particular to a terahertz heterodyne array receiver offset multiplexing device. Background technique [0002] Since the discovery of CO molecular lines in the 1970s, terahertz technology has played an important role in the study of galaxies, star formation, and interstellar medium. Molecular clouds cover a large area of ​​the sky, ranging from tens of square arc minutes to hundreds of square degrees. The main component of the molecular cloud is molecular gas, and the molecular spectrum radiated at the temperature and density falls in the terahertz frequency band. Through the observation of the high angular resolution of the terahertz molecular spectrum, the composition of the molecular cloud and the corresponding evolution process can be studied. The single-pixel heterodyne receiver scans such a large area of ​​the sky, it takes a long time, or even cannot be completed, and the scanning speed of t...

AI Technical Summary

Problems solved by technology

For a single-pixel heterodyne receiver, the monitoring of the DC bias and current / voltage signal of the mixer can be realized through 6 leads (2 leads provide DC bias, 2 leads monitor voltage, and 2 leads monitor current) , but the terahertz heterodyne array receiver has multiple pixels, if an independent biasing and monitoring scheme is adopted, the number of leads required will increase linearly with the number of pixels

When the number of pixels reaches 100, the number of leads is as high as 600, which will greatly increase the complexity of the system

At the same time, the lead wire will also bring a large heat transfer, which puts forward high requirements on the cooling power of the refrigerator.

On the other hand, the independent adjustment of the operating voltage / current for each mixer will be very time-consuming, requiring the development of a digital adjustment scheme based on bias multiplexing technology

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