Delay line type surface acoustic wave based sensing circuit system design method

Abstract

The invention discloses a delay line type surface acoustic wave based sensing circuit system design method. The method comprises the following steps of: 1, manufacturing a delay line type surface acoustic wave device without a sensitive film; 2, manufacturing a delay line type SAW gas sensor comprising a sensitive film; 3, selecting proper parameters for forming a reference oscillation generationcircuit; 4, selecting proper parameters for forming an oscillation generation circuit; 5, selecting proper parameters for forming an oscillation signal mixing processing circuit; 6, selecting proper parameters for forming a low-frequency signal conditioning circuit; and 7, connecting the reference oscillation generation circuit, the oscillation generation circuit, the oscillation signal mixing processing circuit and the low-frequency signal conditioning circuit. The method is reasonable in design, the designed delay line type surface acoustic wave based sensing circuit system is low in power consumption and can generate high-stability sensing signals.

Description

technical field [0001] The invention belongs to the technical field of sensor information collection, and in particular relates to a design method of a delay line-based surface acoustic wave sensing circuit system. Background technique [0002] In recent years, emerging information industries such as artificial intelligence and the Internet of Things have developed rapidly, especially leading the technological tide with cutting-edge core technologies such as 5G high-band mobile communications, Internet+, big data computing, and Internet of Things perception. The development of many emerging information industries is inseparable from the support of sensor information collection technology. Surface acoustic wave sensing, or SAW sensor, has the advantages of high sensitivity, easy integration and wireless, which is in line with the future development trend of sensors, and is increasingly valued and favored by engineers in the sensor field. [0003] At present, the sensing syst...

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Problems solved by technology

[0003] At present, the sensing system based on SAW technology puts forward more stringent requirements on its matching circuit with the improvement of the sensitivity of SAW sensor. However, the current sensing system based on SAW technology generally has problems such as low system stability and high power consumption. It is very easy to cause false alarms and malfunctions of the sensor system, which has caused major losses to the national economy and national property.

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