Radiometer based on zero reflection network

Abstract

The invention discloses a radiometer based on a zero reflection network. The radiometer comprises a multi-stage low noise amplifier and the zero reflection network. The multi-stage low-noise amplifier comprises N cascaded single-stage low-noise amplification units which are sequentially marked as a first-stage low-noise amplification unit,..., an ith-stage low-noise amplification unit,... and an Nth-stage low-noise amplification unit and are used for amplifying radio frequency input signals, and the zero reflection network is used for matching output impedance of the multi-stage low-noise amplifier, the out-of-band reflection signal is absorbed so as to realize that no reflection signal exists at the port; the frequency mixer can be arranged at the last stage of the heterodyne radiometer based on the zero reflection network; the detector can be arranged at the last stage of the direct detection type radiometer based on the zero reflection network. By introducing the zero reflection network, the linearity, the sensitivity and the stability of the radiometer system are improved, and meanwhile, the circuit size is reduced.

Description

technical field [0001] The invention belongs to the technical field of radiometers, and more specifically relates to a radiometer based on a zero-reflection network and its derivative architecture. Background technique [0002] A radiometer is a device designed according to the radiation characteristics of an object, which can receive thermal radiation from the environment for detection and imaging. Heterodyne architecture and direct detection architecture are widely used in the design of radiometers. The former is mainly composed of multi-stage low-noise amplifiers (LNA) and mixers, and the latter is mainly composed of multi-stage low-noise amplifiers and detectors. The maturity of the silicon process makes it possible to fully integrate and high-performance millimeter-wave radiometers, which can be used in V-band, W-band and even higher frequency bands. Usually, the magnitude of the environmental radiation signal is about -90dBm, and the millimeter-wave radiometer detects...

AI Technical Summary

Problems solved by technology

[0009] In view of the defects and improvement needs of the prior art, the purpose of the present invention is to provide a radiometer based on a zero-reflection network, which aims to solve the problem that the existing radiometer is limited by device performance or circuit structure in reducing inter-stage reflection technology. Reflection signal absorption bandwidth is narrow, gain is reduced, can not be fully integrated, the circuit size is large or the problem of high power consumption, the present invention further improves the stability and linearity of the system at the same time

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