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Feedback sweep frequency type DDS design method suitable for surface acoustic wave sensor

A surface acoustic wave and design method technology, applied in the direction of electrical components, impedance networks, etc., can solve problems such as inaccurate application of excitation signals and inflexibility of fixed-point frequency sweeping

Active Publication Date: 2020-05-29
XIAN UNIV OF SCI & TECH
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Problems solved by technology

The excitation signal is transmitted to the surface acoustic wave sensor through the FPGA, which solves the problems of inflexibility of fixed-point frequency sweep and inaccurate application of the excitation signal in the existing DDS design, and greatly enhances its practical application significance

Method used

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  • Feedback sweep frequency type DDS design method suitable for surface acoustic wave sensor
  • Feedback sweep frequency type DDS design method suitable for surface acoustic wave sensor

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Experimental program
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Embodiment Construction

[0063] like figure 1 A feedback swept-frequency DDS design method suitable for a surface acoustic wave sensor is shown, and the method includes the following steps:

[0064] Step 1. Frequency setting:

[0065] Step 101, using the FPGA microcontroller to set the lower limit of the initial frequency interval to DFord=5.0MHz, and the upper limit of the initial frequency interval to UFord=15.0MHz;

[0066] Step 102, adopt the FPGA microcontroller to set the initial frequency to 5MHz, and obtain the frequency control word and store it in the frequency register;

[0067] Step 103, connect the FPGA microcontroller to the surface acoustic wave sensor;

[0068] Step 2. Accumulation of phase accumulator and frequency register:

[0069] In the i-th clock signal, the accumulated data of the phase accumulator and the frequency register are obtained. The specific process is as follows:

[0070] Step 201: Use the FPGA microcontroller to add the 0th to 7th bits of the clock frequency in t...

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Abstract

The invention discloses a feedback sweep frequency type DDS design method suitable for a surface acoustic wave sensor. The method comprises the following steps: 1, setting frequency; 2, accumulating aphase accumulator and a frequency register; 3, acquiring amplitude and phase information; 4, obtaining a first refreshing frequency interval; 5, obtaining a second refreshing frequency interval; and6, obtaining a third refreshing frequency interval. The method is simple in step and reasonable in design. The FPGA microcontroller is adopted to generate the excitation signal for the SWA acoustic surface wave sensor, the stable and reliable excitation signal can be generated through feedback adjustment output. In addition, based on the programmable performance of the FPGA, the cost is low, and analog circuit building is avoided.

Description

technical field [0001] The invention belongs to the technical field of excitation and application of surface acoustic wave sensors, and in particular relates to a feedback frequency sweep type DDS design method suitable for surface acoustic wave sensors. Background technique [0002] With the rapid development of electronic computer technology, DDS signal generator, as a general electronic instrument, has been widely used in the fields of production, scientific research, electronic measurement and communication because it can generate waveforms of different frequencies and shapes. However, such instruments that can be seen on the market can no longer meet the actual needs in terms of bandwidth, accuracy and waveform types. [0003] At present, most of the signal generators usually used in production and scientific research are composed of analog circuits, but because of their large size, difficulty in modulation, and high cost, they no longer meet the needs of the power indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/25H03H9/64
CPCH03H9/25H03H9/64
Inventor 张涛朱寒师晓云郭宁兰鹏涛王益祎
Owner XIAN UNIV OF SCI & TECH
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