Test circuit of acoustic surface wave resonator type wireless sensor sensing echo frequency

A wireless sensor and surface acoustic wave technology, applied in frequency measurement devices and other directions, can solve problems such as limitations, and achieve the effect of improving the accuracy of DFT frequency measurement

Inactive Publication Date: 2015-01-28
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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Problems solved by technology

That is to say, the DFT results obtained at the temperature of 30 degrees and 38 degrees are the same, indicating that no matter how good the accuracy of the equipment test is, or repeating more measurements, it is also limited by the DFT method

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  • Test circuit of acoustic surface wave resonator type wireless sensor sensing echo frequency
  • Test circuit of acoustic surface wave resonator type wireless sensor sensing echo frequency
  • Test circuit of acoustic surface wave resonator type wireless sensor sensing echo frequency

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] The present invention is a test circuit for detecting the echo frequency of a surface acoustic wave resonator type wireless sensor. sense echo frequency. The simplest method is to use a pre-sampling signal saturation amplifier circuit to distort the signal, generate high-order harmonics, and realize high-order frequency multiplication of the signal.

[0048] As mentioned above, there are many methods for signal frequency multiplication, and the present invention particularly recommends the use of a pre-sampling signal saturation amplifier circuit to distort the signal, generate high-order harmonics, and realize high-order frequency multiplication of the signal. Using the technology of signal overload to make it harmonic, the circuit is simple and easy to operate. The details of the present invention will be described below wi...

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Abstract

The invention discloses a test circuit of acoustic surface wave resonator type wireless sensor sensing echo frequency. The test circuit of the acoustic surface wave resonator type wireless sensor sensing echo frequency is characterized in that high order frequency doubling is performed on an echo signal after down conversion, and then the sensing echo frequency is detected by using a Fourier transformation digital processing method. The simplest test method of the test circuit of the acoustic surface wave resonator type wireless sensor sensing echo frequency is to achieve the signal high order frequency doubling by using a signal saturation amplification circuit before sampling, distorting a signal and generating high order harmonic. The test circuit of the acoustic surface wave resonator type wireless sensor sensing echo frequency has the advantage of being capable of greatly improving DFT (discrete Fourier transformation) frequency measurement accuracy on the premise of not prolonging duration of signal sampling time.

Description

technical field [0001] The invention relates to the field of surface acoustic wave resonators, in particular to a test circuit for sensing echo frequency by a surface acoustic wave resonator type wireless sensor. Background technique [0002] The surface acoustic wave resonator is a passive electronic component that uses metal electrode structures such as interdigital transducers and periodic reflection gratings fabricated on piezoelectric substrates to form surface acoustic wave resonators, and realizes electrical resonance based on the (inverse) piezoelectric effect. , has been widely used in modern electronic technology. [0003] Since the natural resonant frequency of the surface acoustic wave resonator will be slightly changed by the influence of the ambient temperature ( figure 1 ), the magnitude of its variation mainly depends on the temperature characteristics of the piezoelectric substrate. The change of ambient temperature can be deduced by detecting this frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
Inventor 夏前亮陈培杕刘众胡建学孙建萍
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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