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Design of linear sweep source based on DDS used in readout system for wireless passive pressure sensor

机译：无线被动压力传感器读出系统中基于DDS的线性扫描源设计

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摘要

This paper proposes the design and research on the high bandwidth linear frequency sweep signal source involved in the readout unit module of the wireless passive pressure sensor in high temperature based on the principle of mutual inductance coupling which is applied widely at present. The operating principle of the linear sweep frequency source based on the direct digital frequency synthesis (DDS) technology is introduced, and the implementation method of the hardware circuit and logic sequential control process required in our system has been realized utilizing this technology. Through the experiments under different conditions of the step value, the sweep range and other related design indicators, the influence on the extraction method of resonance frequency information, extraction accuracy, and others during the readout system of the mutual inductance coupling sensor are analyzed and studied. The design of the linear frequency sweep signal source is realized with a resonance frequency change resolution of 6 kHz, a minimum step value of 1 kHz, and a precision of frequency for 0.116 Hz within the sweep width of 1 MHz–100 MHz. Due to the use of the integrated commercial chip, the linear sweep frequency source is made small in size, high working frequency, high resolution and low step values for the readout unit modularized of a higher application value.
机译：本文基于互感耦合原理，提出了无线无源压力传感器高温读出单元模块所涉及的高带宽线性扫频信号源的设计与研究，该方法目前已得到广泛应用。介绍了基于直接数字频率合成（DDS）技术的线性扫描频率源的工作原理，并利用该技术实现了本系统所需的硬件电路的实现方法和逻辑时序控制过程。通过在不同阶跃条件，扫描范围及其他相关设计指标条件下的实验，分析研究了互感耦合传感器读出系统对谐振频率信息的提取方法，提取精度等的影响。 。线性频率扫描信号源的设计实现了6 kHz的共振频率变化分辨率，1 kHz的最小步进值以及1 MHz–100 MHz扫描宽度内0.116 Hz的频率精度。由于使用了集成的商用芯片，使得线性扫描频率源的尺寸小，工作频率高，分辨率高，并且对于具有较高应用价值的模块化读取单元而言，步进值较低。

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