Synchronous driving device and method of lithium niobate phase modulator based on DDS

Abstract

The present application relates to a DDS-based synchronous driving method, device, computer equipment and storage medium for a lithium niobate phase modulator. The method includes: a serial communication circuit converts the TTL-level universal asynchronous transceiver transmission interface of the single-chip microcomputer into an RS232 standard serial port so that the single-chip microcomputer communicates with the serial port of the host computer; the single-chip microcomputer communicates with the host computer through the serial port and receives the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer; the DDS frequency synthesizer is used to generate the waveform signal required for the lithium niobate crystal drive electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer; the filter circuit is used to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer, and the power amplifier circuit is used to perform voltage and current amplification on the signal output by the filter circuit to obtain a driving waveform. The present method can automatically generate the driving signal required by the lithium niobate phase modulator.

Description

Technical Field

[0001] The present invention relates to the technical field of phase modulation in optical fiber sensing technology, and in particular to a DDS-based lithium niobate phase modulator synchronous driving device and method. Background Art

[0002] Optical phase modulation is a commonly used modulation method in fiber optic sensing technology. With the rapid development of fiber optic gyroscopes, fiber optic hydrophones and other fiber optic sensing technologies, electro-optic phase modulators based on lithium niobate crystals have received more and more attention in the industry. According to the physical and optical properties of lithium niobate crystals themselves, the phase of the output beam of the crystal will change with the change of the voltage signal applied to both ends of the crystal, thereby producing the effect of optical phase modulation. Different modulation requirements also have different requirements for the amplitude, frequency and phase of the required applied electrical signal.

[0003] However, the current industry usually needs to use a signal generator as a drive circuit generator to generate the required drive signal when using lithium niobate phase modulators. In multi-element fiber optic sensing devices such as time-division multiplexed fiber optic hydrophone arrays, the phase of the optical phase modulator drive signal needs to be strictly controlled, which places higher synchronization requirements on the clock and initial phase of the drive circuit. In addition, fiber optic sensing equipment generally requires the device size to be as compact as possible, and usually requires a flexible, compact, programmable lithium niobate phase modulator and its synchronous drive device to improve the system's integration. Signal generators have problems such as complex systems and low automation. Summary of the invention

[0004] Based on this, it is necessary to provide a DDS-based lithium niobate phase modulator synchronous driving device that can automatically generate the driving signal required by the lithium niobate phase modulator in order to solve the above technical problems.

[0005] A DDS-based lithium niobate phase modulator synchronous driving device, the device comprising: a power management circuit, a serial communication circuit, a single-chip microcomputer, a DDS frequency synthesizer, a filter circuit, and a power amplifier circuit;

[0006] The power management circuit is used to convert a single-channel DC voltage source input from the outside into multiple DC power supplies required by other sub-circuits in the device;

[0007] The serial communication circuit converts the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into the RS232 standard serial port so that the single-chip microcomputer can communicate with the host computer through the serial port;

[0008] The single-chip microcomputer is used to communicate with the host computer through the serial port and receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer;

[0009] The DDS frequency synthesizer is used to generate a waveform signal required for the lithium niobate crystal to drive the electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer; the waveform signal required for the lithium niobate crystal to drive the electrical signal includes a sine wave, a triangle wave or a square wave with a specific frequency and phase;

[0010] The filter circuit is used to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer to filter out the influence of the mirror frequency response of the DDS frequency synthesizer in the digital analog change;

[0011] The power amplifier circuit is used to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform.

[0012] In one embodiment, the multiple DC power supplies required by other sub-circuits include the digital power supply required for the serial communication circuit, the single-chip microcomputer, the DDS frequency synthesizer, and the positive and negative voltage analog power supplies required for the DDS frequency synthesizer and the power amplifier circuit.

[0013] In one embodiment, the DDS waveform configuration parameters include the amplitude, frequency, waveform type, initial phase and other parameters of the waveform that the DDS frequency synthesizer needs to output, or a waveform data table of a single cycle containing the amplitude, frequency, waveform type, initial phase and other parameters.

[0014] In one of the embodiments, after receiving the synchronization pulse signal, the DDS frequency synthesizer will output the waveform signal required for the lithium niobate crystal driving electrical signal according to the waveform configuration parameters after a specific delay after the rising edge or falling edge of the synchronization pulse signal; different models of DDS frequency synthesizers will have different specified delays, but the phase delay caused by the delay is compensated by setting the initial phase parameters in the DDS waveform configuration parameters.

[0015] In one embodiment, the filter circuit uses an inductor and a capacitor to construct an LC low-pass filter network to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer, thereby filtering out the influence of the image frequency response in the digital-to-analog change of the DDS frequency synthesizer.

[0016] In one embodiment, the power amplifier circuit uses an operational amplifier chip and a power amplifier chip to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform.

[0017] A DDS-based lithium niobate phase modulator synchronous driving method, characterized in that the method comprises:

[0018] Obtain a single DC voltage source from external input;

[0019] Converting a single-channel DC voltage source input from the outside into multiple DC power supplies required by other sub-circuits in the device; other sub-circuits include serial communication circuits, single-chip microcomputers, and DDS frequency synthesizers;

[0020] Convert the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into the RS232 standard serial port, communicate with the host computer according to the RS232 standard serial port, receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer, and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer;

[0021] Write the DDS waveform configuration parameters into the DDS frequency synthesizer, and the DDS frequency synthesizer enters the state of waiting for the synchronization pulse. After receiving the rising edge or falling edge of the external synchronization pulse, the configuration parameters of the DDS frequency synthesizer begin to take effect and output the waveform signal required by the lithium niobate crystal driving electrical signal after the specified delay;

[0022] Perform low-pass filtering on the waveform signal to filter out the influence of the mirror frequency response of the DDS frequency synthesizer in the digital-to-analog change;

[0023] The signal output by the filter circuit is amplified in voltage and current to obtain a driving waveform.

[0024] The DDS-based lithium niobate phase modulator synchronous driving device and method, the present invention sets a serial communication circuit to enable the single-chip microcomputer to communicate with the host computer via the serial port. The single-chip microcomputer serves as the control center of the entire lithium niobate phase modulator driving device, communicates with the host computer via the serial port and receives the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and saves the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer. The DDS frequency synthesizer generates the waveform signal required for the lithium niobate crystal driving electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer, and generates the driving waveform required by the lithium niobate phase modulator through the filtering circuit and the power amplifier circuit, and has an integrated The single-chip microcomputer communicates with the host computer through the serial port to control the DDS waveform parameters and then realizes the automatic control of the driving waveform parameters. It can simply and quickly automatically generate the driving signal required by the lithium niobate phase modulator. At the same time, when the external reference clock signal is connected to the reference clock interface of the DDS frequency synthesizer, after the internal phase-locked loop of the DDS frequency synthesizer multiplies the frequency, it will generate the internal clock required for the DDS frequency synthesizer to work. The DDS clock synchronization based on the external reference clock and the DDS output phase synchronization based on the external synchronization pulse can realize the output phase modulator drive signal to meet the synchronization requirements of the optical fiber sensing equipment in terms of frequency and phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A schematic diagram of a DDS-based lithium niobate phase modulator synchronous driving device in one embodiment;

[0026] Figure 2 The figure is a flow chart of a synchronous driving method of a lithium niobate phase modulator based on DDS in one embodiment. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] In one embodiment, Figure 1 As shown, a DDS-based lithium niobate phase modulator synchronous driving device is provided, the device comprising: a power management circuit, a serial communication circuit, a single-chip microcomputer, a DDS frequency synthesizer, a filtering circuit, and a power amplifier circuit;

[0029] The power management circuit is used to convert a single-channel DC voltage source input from the outside into multiple DC power supplies required by other sub-circuits in the device;

[0030] The serial communication circuit converts the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into the RS232 standard serial port so that the single-chip microcomputer can communicate with the host computer through the serial port;

[0031] The single-chip microcomputer is used to communicate with the host computer through the serial port and receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer;

[0032] The DDS frequency synthesizer is used to generate a waveform signal required for the lithium niobate crystal to drive the electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer; the waveform signal required for the lithium niobate crystal to drive the electrical signal includes a sine wave, a triangle wave or a square wave with a specific frequency and phase;

[0033] The filter circuit is used to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer to filter out the influence of the mirror frequency response of the DDS frequency synthesizer in the digital analog change;

[0034] The power amplifier circuit is used to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform.

[0035] In the above-mentioned DDS-based lithium niobate phase modulator synchronous driving device, the present invention enables the single-chip microcomputer to communicate with the host computer through the serial port by setting a serial port communication circuit. The single-chip microcomputer serves as the control center of the entire lithium niobate phase modulator driving device, communicates with the host computer through the serial port and receives the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and saves the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer. The DDS frequency synthesizer generates the waveform signal required by the lithium niobate crystal driving electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer, and generates the driving waveform required by the lithium niobate phase modulator through the filtering circuit and the power amplifier circuit, which has high integration. , high degree of automation, and the single-chip microcomputer communicates with the host computer through the serial port to realize the control of the DDS waveform parameters and then realizes the automatic control of the driving waveform parameters. It can simply and quickly automatically generate the driving signal required by the lithium niobate phase modulator. At the same time, when the external reference clock signal is connected to the reference clock interface of the DDS frequency synthesizer, after the internal phase-locked loop of the DDS frequency synthesizer multiplies the frequency, it will generate the internal clock required for the DDS frequency synthesizer to work, the DDS clock synchronization based on the external reference clock and the DDS output phase synchronization based on the external synchronization pulse can realize the output phase modulator drive signal to meet the synchronization requirements of the optical fiber sensing equipment in terms of frequency and phase.

[0036] In one embodiment, the multiple DC power supplies required by other sub-circuits include the digital power supply required for the serial communication circuit, the single-chip microcomputer, the DDS frequency synthesizer, and the positive and negative voltage analog power supplies required for the DDS frequency synthesizer and the power amplifier circuit.

[0037] In one embodiment, the DDS waveform configuration parameters include the amplitude, frequency, waveform type, initial phase and other parameters of the waveform that the DDS frequency synthesizer needs to output, or a waveform data table of a single cycle containing the amplitude, frequency, waveform type, initial phase and other parameters.

[0038] In one of the embodiments, after receiving the synchronization pulse signal, the DDS frequency synthesizer will output the waveform signal required for the lithium niobate crystal driving electrical signal according to the waveform configuration parameters after a specific delay after the rising edge or falling edge of the synchronization pulse signal; different models of DDS frequency synthesizers will have different specified delays, but the phase delay caused by the delay is compensated by setting the initial phase parameters in the DDS waveform configuration parameters.

[0039] The external reference clock signal is connected to the reference clock interface of the DDS frequency synthesizer, and after being multiplied by the internal phase-locked loop of the DDS frequency synthesizer, the internal clock required for the operation of the DDS frequency synthesizer is generated. Similarly, the external synchronization pulse is connected to the output enable interface of the DDS frequency synthesizer. After receiving the synchronization pulse signal, the DDS frequency synthesizer will start to output the waveform signal according to the waveform configuration parameters after a specific delay after the rising edge or falling edge of the synchronization pulse signal, so as to realize the DDS clock synchronization of the external reference clock and the DDS output phase synchronization of the external synchronization pulse. Different models of DDS frequency synthesizers will have different specified delays, but the phase delay caused by the delay can be compensated by setting the initial phase parameters in the DDS waveform configuration parameters, so as not to affect the synchronization of the final output drive signal of the device.

[0040] By using the method of DDS clock synchronization based on an external reference clock and DDS output phase synchronization based on an external synchronization pulse, the output phase modulator drive signal can meet the synchronization requirements of the optical fiber sensing device in terms of frequency and phase.

[0041] In one embodiment, the filter circuit uses an inductor and a capacitor to construct an LC low-pass filter network to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer, thereby filtering out the influence of the image frequency response in the digital-to-analog change of the DDS frequency synthesizer.

[0042] In one embodiment, the power amplifier circuit uses an operational amplifier chip and a power amplifier chip to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform.

[0043] The power amplifier circuit uses an operational amplifier chip and a power amplifier chip to amplify the voltage and current of the signal output by the filter circuit, thereby providing signal driving capability to meet the power requirements required for driving the lithium niobate crystal.

[0044] In one embodiment, Figure 2 As shown, a DDS-based lithium niobate phase modulator synchronous driving method, the method comprising:

[0045] Step 202, obtain a single DC voltage source input from the outside; convert the single DC voltage source input from the outside into multiple DC power supplies required by other sub-circuits in the device; the other sub-circuits include serial communication circuits, single-chip microcomputers, and DDS frequency synthesizers.

[0046] Step 204, convert the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into an RS232 standard serial port, communicate with the host computer according to the RS232 standard serial port and receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer.

[0047] Step 206, write the DDS waveform configuration parameters into the DDS frequency synthesizer, and the DDS frequency synthesizer enters a state of waiting for a synchronization pulse. After receiving the rising edge or falling edge of the external synchronization pulse, the configuration parameters of the DDS frequency synthesizer take effect and output the waveform signal required for the lithium niobate crystal drive electrical signal after a specified delay.

[0048] Step 208, low-pass filtering is performed on the waveform signal to filter out the influence of the image frequency response of the DDS frequency synthesizer in the digital-to-analog change; the voltage and current of the signal output by the filter circuit are amplified to obtain a driving waveform.

[0049] In the above-mentioned DDS-based lithium niobate phase modulator synchronous driving method, the present invention enables the single-chip microcomputer to communicate with the host computer through the serial port by setting a serial port communication circuit. The single-chip microcomputer serves as the control center of the entire lithium niobate phase modulator driving device, communicates with the host computer through the serial port and receives the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and saves the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer. The DDS frequency synthesizer generates the waveform signal required for the lithium niobate crystal driving electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer, and generates the driving waveform required by the lithium niobate phase modulator through the filtering circuit and the power amplifier circuit, which has high integration. , high degree of automation, and the single-chip microcomputer communicates with the host computer through the serial port to realize the control of the DDS waveform parameters and then realizes the automatic control of the driving waveform parameters. It can simply and quickly automatically generate the driving signal required by the lithium niobate phase modulator. At the same time, when the external reference clock signal is connected to the reference clock interface of the DDS frequency synthesizer, after the internal phase-locked loop of the DDS frequency synthesizer multiplies the frequency, it will generate the internal clock required for the DDS frequency synthesizer to work, the DDS clock synchronization based on the external reference clock and the DDS output phase synchronization based on the external synchronization pulse can realize the output phase modulator drive signal to meet the synchronization requirements of the optical fiber sensing equipment in terms of frequency and phase.

[0050] In one embodiment, the multiple DC power supplies required by other sub-circuits include the digital power supply required for the serial communication circuit, the single-chip microcomputer, the DDS frequency synthesizer, and the positive and negative voltage analog power supplies required for the DDS frequency synthesizer and the power amplifier circuit.

[0051] In one embodiment, the DDS waveform configuration parameters include the amplitude, frequency, waveform type, initial phase and other parameters of the waveform that the DDS frequency synthesizer needs to output, or a waveform data table of a single cycle containing the amplitude, frequency, waveform type, initial phase and other parameters.

[0052] In one embodiment, different types of DDS frequency synthesizers may have different specified delays, but the phase delay caused by the delay can be compensated using the initial phase parameters in setting the DDS waveform configuration parameters.

[0053] It should be understood that although Figure 2 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0054] For the specific definition of a DDS-based lithium niobate phase modulator synchronous driving device, please refer to the definition of a DDS-based lithium niobate phase modulator synchronous driving method above, which will not be repeated here. Each module in the above-mentioned DDS-based lithium niobate phase modulator synchronous driving device can be fully or partially implemented by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0055] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A DDS-based lithium niobate phase modulator synchronous driving device, characterized in that: The device comprises: a power management circuit, a serial communication circuit, a single chip microcomputer, a DDS frequency synthesizer, a filter circuit, and a power amplifier circuit; The power management circuit is used to convert a single-channel DC voltage source input from the outside into multiple DC power supplies required by other sub-circuits in the device; The serial communication circuit converts the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into an RS232 standard serial port so that the single-chip microcomputer communicates with the host computer via the serial port; The single-chip microcomputer is used to communicate with the host computer through the serial port and receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer; The DDS frequency synthesizer is used to generate a waveform signal required for the lithium niobate crystal to drive the electrical signal according to the DDS waveform configuration parameters of the DDS frequency synthesizer; the waveform signal required for the lithium niobate crystal to drive the electrical signal includes a sine wave, a triangle wave or a square wave of a specific frequency and phase; The filtering circuit is used to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer to filter out the influence of the image frequency response of the DDS frequency synthesizer in the digital-to-analog change; The power amplifier circuit is used to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform 2. The device according to claim 1, characterized in that The multi-channel DC power supplies required by the other sub-circuits include digital power supplies required for the serial communication circuit, the single-chip microcomputer, the DDS frequency synthesizer, and positive and negative voltage analog power supplies required for the DDS frequency synthesizer and the power amplifier circuit.

3. The device according to claim 1, characterized in that The DDS waveform configuration parameters include the parameters of the output waveform required by the DDS frequency synthesizer or a waveform data table of a single cycle; the parameters of the output waveform required by the DDS frequency synthesizer include the amplitude, frequency, waveform type and initial phase of the output waveform; the waveform data table of a single cycle includes the amplitude, frequency, waveform type and initial phase.

4. The device according to claim 1, characterized in that After receiving the synchronization pulse signal, the DDS frequency synthesizer will output the waveform signal required for the lithium niobate crystal driving electrical signal according to the waveform configuration parameters after a specific delay after the rising edge or falling edge of the synchronization pulse signal; different models of DDS frequency synthesizers will have different specified delays, but the phase delay caused by the delay is compensated by setting the initial phase parameters in the DDS waveform configuration parameters.

5. The device according to claim 1, characterized in that The filter circuit uses an inductor and a capacitor to build an LC low-pass filter network to perform low-pass filtering on the waveform signal output by the DDS frequency synthesizer, thereby filtering out the influence of the image frequency response in the digital analog change of the DDS frequency synthesizer.

6. The device according to claim 1, characterized in that The power amplifier circuit uses an operational amplifier chip and a power amplifier chip to amplify the voltage and current of the signal output by the filter circuit to obtain a driving waveform.

7. A DDS-based lithium niobate phase modulator synchronous driving method, characterized in that: The method comprises: Obtain a single DC voltage source from external input; Convert the external input single-channel DC voltage source into multiple DC power sources required by other sub-circuits in the device; the other sub-circuits include serial communication circuits, single-chip microcomputers, and DDS frequency synthesizers; Convert the TTL level universal asynchronous transceiver transmission interface of the single-chip microcomputer into an RS232 standard serial port, communicate with a host computer according to the RS232 standard serial port and receive the DDS waveform configuration parameters of the DDS frequency synthesizer sent by the host computer and save the DDS waveform configuration parameters of the DDS frequency synthesizer in the FLASH inside the single-chip microcomputer; The DDS waveform configuration parameters are written into the DDS frequency synthesizer, and the DDS frequency synthesizer enters a state of waiting for a synchronization pulse. After receiving a rising edge or a falling edge of an external synchronization pulse, the configuration parameters of the DDS frequency synthesizer take effect and output a waveform signal required by the lithium niobate crystal driving electrical signal after a specified delay; Low-pass filtering is performed on the waveform signal to filter out the influence of the image frequency response of the DDS frequency synthesizer in the digital-to-analog change; The signal output by the filter circuit is amplified in voltage and current to obtain a driving waveform.

8. The method according to claim 7, characterized in that The multi-channel DC power supplies required by the other sub-circuits include digital power supplies required for the serial communication circuit, the single-chip microcomputer, the DDS frequency synthesizer, and positive and negative voltage analog power supplies required for the DDS frequency synthesizer and the power amplifier circuit.

9. The method according to claim 8, characterized in that The DDS waveform configuration parameters include the parameters of the output waveform required by the DDS frequency synthesizer or a waveform data table of a single cycle; the parameters of the output waveform required by the DDS frequency synthesizer include the amplitude, frequency, waveform type and initial phase of the output waveform; the waveform data table of a single cycle includes the amplitude, frequency, waveform type and initial phase.

10. The method according to claim 8, characterized in that The method further comprises: Different models of DDS frequency synthesizers will have different specified delays, but the phase delay caused by the delay can be compensated using the initial phase parameters in setting the DDS waveform configuration parameters.

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