A Design of Analog Complex Correlator for Millimeter- Wave Temperature Measurement

2020 IEEE MTT-S International Wireless Symposium (IWS) Pub Date : 2020-09-20 DOI:10.1109/IWS49314.2020.9360195

Jie Liu, Pan Ma, Guangmin Sun, Chong Shi, Jingyan Ma

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引用次数: 1

Abstract

A high-sensitivity multiplicative analog complex correlator is designed to meet the medical requirement of measuring the human body temperature by adopting millimeterwave radiometer technology. The analog complex correlator adopts phase shifter to calibrate the phase deviation of the two input signals in order to improve the precision of temperature measurement. Compared with the traditional scheme of the diode square law detector, this paper tries to adopt quadrature demodulator to accomplish the detecting function. The result indicates that the detection sensitivity improves 3.478 times and the bandwidth increases to 5.5 GHz, in addition, the structure of the circuit is simplified. The experimental results show that the sensitivity of the analog complex correlator can reach 173 mV / dBm when the input power is in the range of 7dBm to 8dBm. When the human body temperature is in the range of 330ºC to 43º C, the precision can reach ± 0.331 º C. Having the phase error, offset error and gain error calibrated by software algorithm, the analog complex correlator can reach the level of medical measurement.

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一种用于毫米波测温的模拟复相关器设计

为了满足医学上采用毫米波辐射计技术测量人体体温的需要，设计了一种高灵敏度的乘式模拟复相关器。模拟复相关器采用移相器对两个输入信号的相位偏差进行校正，以提高测温精度。与传统的二极管平方律检测器方案相比，本文尝试采用正交解调器来实现检测功能。结果表明，检测灵敏度提高了3.478倍，带宽提高到5.5 GHz，电路结构也得到了简化。实验结果表明，当输入功率在7dBm ~ 8dBm范围内时，模拟复相关器的灵敏度可达173 mV / dBm。当人体温度在330ºC ~ 43ºC范围内时，精度可达±0.331ºC，通过软件算法校正相位误差、偏移误差和增益误差，模拟复合相关器可达到医学测量水平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE MTT-S International Wireless Symposium (IWS)

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