Phase calibration method for signal source and system thereof

Abstract

The present application is suitable for the technical field of detection instrument calibration, and provides a phase calibration method of a signal source and a system thereof. The method comprises: obtaining an output voltage curve of a phase detection circuit varying with a phase difference of two input signals; coupling a signal of a first signal source and a signal of a second signal source to the phase detection circuit through a combiner; and performing phase calibration of the signal source based on the output voltage curve. Thus, the present application can quickly and conveniently calibrate the phase of the signal source with simple circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detecting instrument calibration, and particularly relates to a phase calibration method of a signal source and a system thereof. BACKGROUND

[0002] In the prior art, when two signal sources are used together, a 10MHz OUT interface of one signal source and a 10MHz IN interface of another signal source are connected by using a BNC (Bayonet Nut Connector) synchronous line, so that the two signal sources share a reference clock and realize clock synchronization. However, if the two signal sources need to output signals of the same frequency, the relative phase of the signals output by the two signal sources is uncertain.

[0003] In some practical applications (for example, a combiner), the relative phase of the signals output by the two signal sources needs to be known. The method adopted in the prior art is to use an oscilloscope to observe the phases of the two signals, and to set the AdjustPhase of the signal source to calibrate the phase. However, this method is not only cumbersome and not conducive to automatic control by using software, but also has very high requirements on the performance of the oscilloscope when the frequency is high.

[0004] In summary, the prior art has obvious inconvenience and defects in practical use, and therefore needs to be improved. SUMMARY

[0005] In view of the above defects, the present application aims to provide a phase calibration method of a signal source and a system thereof, which can quickly and conveniently calibrate the phase of the signal source.

[0006] To achieve the above purpose, the present application provides a phase calibration method of a signal source, comprising:

[0007] obtaining an output voltage curve of a phase detection circuit changing with the phase difference of two input signals;

[0008] coupling the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a combiner;

[0009] calibrating the phase of the signal source based on the output voltage curve.

[0010] According to the phase calibration method of the signal source, the phase detection circuit outputs voltage through a differential voltage output circuit, and the obtaining of the output voltage curve of the phase detection circuit changing with the phase difference of two input signals comprises:

[0011] obtaining a differential output voltage curve of the phase detection circuit changing with the phase difference of two input signals.

[0012] According to the phase calibration method of the signal source, the phase calibration based on the output voltage curve comprises:

[0013] adjusting the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90° and 90°;

[0014] adjusting the phase of the signal of the second signal source, so that the differential output voltage of the phase detection circuit is 0V, and at this time the slope of the differential output voltage curve at the differential output voltage of 0V is positive; zeroing the phase of the signal of the second signal source, at this time the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90°;

[0015] setting the phase of the signal of the second signal source to 90°, and zeroing the phase of the signal of the second signal source again to complete the phase calibration of the signal source.

[0016] According to the phase calibration method of the signal source, the signal of the first signal source and the signal of the second signal source are coupled to the phase detection circuit through a combiner, which comprises:

[0017] The signal of the first signal source and the signal of the second signal source are respectively input from two input ports of the combiner, and the signal of the first signal source and the signal of the second signal source are coupled to the phase detection circuit through a microstrip line.

[0018] According to the phase calibration method of the signal source, the phase calibration of the signal source based on the output voltage curve further comprises:

[0019] According to the output voltage of the phase detection circuit, the phase difference of the signal of the second signal source relative to the signal of the first signal source is obtained.

[0020] In order to achieve the above-mentioned purpose, the present application also provides a signal source phase calibration system, comprising:

[0021] a curve acquisition module for acquiring the output voltage curve of the phase detection circuit with the phase difference of the two input signals changing;

[0022] a signal coupling module for coupling the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a combiner;

[0023] a phase calibration module for performing phase calibration of the signal source based on the output voltage curve.

[0024] According to the phase calibration system of the signal source, the phase detection circuit outputs a voltage through a differential voltage output circuit, and the curve acquisition module is specifically configured to:

[0025] acquire a differential output voltage curve of the phase detection circuit varying with a phase difference of two input signals.

[0026] According to the phase calibration system of the signal source, the phase calibration module is specifically configured to:

[0027] adjust the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, a phase difference of the signal of the second signal source relative to the signal of the first signal source is -90° and 90°;

[0028] adjust the phase of the signal of the second signal source, so that the differential output voltage of the phase detection circuit is 0V, and at this time, a slope of the differential output voltage curve at the differential output voltage of 0V is positive; and zero the phase of the signal of the second signal source, so that the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90°;

[0029] set the phase of the signal of the second signal source to 90°, and zero the phase of the signal of the second signal source again, to complete the phase calibration of the signal source.

[0030] According to the phase calibration system of the signal source, the signal coupling module is specifically configured to:

[0031] input the signal of the first signal source and the signal of the second signal source from two input ports of the combiner respectively, and couple the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a microstrip line.

[0032] According to the phase calibration system of the signal source, the system further comprises a phase difference acquisition module: for obtaining a phase difference of the signal of the second signal source relative to the signal of the first signal source based on the output voltage of the phase detection circuit after the phase calibration of the signal source based on the output voltage curve.

[0033] The embodiment of the present application acquires the output voltage curve of the phase detection circuit changing with the phase difference of two input signals; couples the signal of the first signal source and the signal of the second signal source to the phase detection circuit through the combiner; and the phase detection circuit calibrates the phase of the signal source based on the output voltage curve. Thus, the present application calibrates the phase of the signal source through the combiner and the phase detection circuit, which is simple and convenient, thereby solving the technical problem of complex phase calibration equipment and complicated operation process, and realizing fast and convenient phase calibration of the signal source. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the flow chart of the phase calibration method of the signal source of the embodiment of the present application;

[0035] Figure 2 is the module schematic diagram of the phase calibration system of the signal source of the embodiment of the present application;

[0036] Figure 3 is the circuit diagram of the phase detection circuit of the prior art with model AD4510;

[0037] Figure 4 is the output voltage curve diagram of the phase detection circuit of the prior art with model AD4510;

[0038] Figure 5 is the circuit diagram of the differential voltage output circuit of the prior art;

[0039] Figure 6 is the output voltage curve diagram of the adjusted phase detection circuit of the embodiment of the present application;

[0040] Figure 7 is the connection schematic diagram of the signal source and the phase detection circuit of the embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the 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.

[0042] It is to be understood that the references used herein to "one embodiment", "an embodiment", "example embodiment", etc. do not necessarily all refer to the same embodiment, although they can. Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. The foregoing description, for purposes of clarity, only describes the most basic form of the implementations in order to provide a concept of the disclosure. For

[0043] In addition, some of the components and / or devices described in the specification can have the same reference numerals but different names as the names of these components and / or devices are used in the specification as identifiers in order to facilitate the discussion of the specifications and claims. Therefore, one of ordinary skill in the art will understand that the names of the components and / or devices are used to clearly identify the components and / or devices in the specification but are not intended to limit the scope of the disclosure.

[0044] Referring to Figure 1 , Figure 1 A flow chart of a method for calibrating the phase of a signal source is shown, the method comprising:

[0045] In step S101, an output voltage curve of the phase detection circuit varying with the phase difference of the two input signals is obtained.

[0046] In step S102, the signal of the first signal source and the signal of the second signal source are coupled to the phase detection circuit through the combiner.

[0047] In step S103, the phase of the signal source is calibrated based on the output voltage curve.

[0048] In this embodiment, the phase calibration of the signal source can be realized by the combiner and the phase detection circuit, the circuit is simple, and after the phase calibration of the signal source, the actual phase difference of the signal of the second signal source relative to the signal of the first signal source can be obtained based on the output voltage of the phase detection circuit. The phase detection circuit can be a phase detection circuit with model AD4510 or AD8302. The phase detection circuit with model AD8302 mainly consists of two precisely matched wideband logarithmic detectors, a phase detector, an output amplifier group, a bias unit and an output reference voltage buffer, and can simultaneously measure the amplitude ratio and the phase difference between two input signals in the frequency range from low frequency to 2.7GHz. The circuit diagram of the phase detection circuit with model AD4510 is shown in Figure 3 The output voltage curve of the phase detection circuit with model AD4510 is shown in Figure 4 As can be seen from Figure 4 , the phase detection circuit detects the phase difference between two signals and outputs a direct current voltage which changes with the phase difference between the two input signals, the same output voltage represents two different phase differences, and the slope of the output voltage curve changes from positive to negative as the phase difference increases. In the specific implementation, the output voltage curve of the phase detection circuit is obtained, and the signals of the two signal sources are coupled from the PCB board of the combiner to the PCB board of the phase detection circuit through microstrip line coupling, that is, the signals of the first signal source and the second signal source are input from the two input ports of the combiner respectively, and the signals of the first signal source and the second signal source are coupled to the phase detection circuit through microstrip line (the circuit diagram of the connection between the signal source and the phase detection circuit is shown in Figure 7 ), and finally, the phase calibration of the signal source is performed based on the output voltage curve.

[0049] As an optional embodiment, the phase detection circuit outputs voltage through a differential voltage output circuit, and step S101 comprises:

[0050] obtaining the differential output voltage curve of the phase detection circuit which changes with the phase difference between the two input signals.

[0051] In this embodiment, in order to resist common mode interference signals, the phase detection circuit is buffered through a differential voltage output circuit. The differential voltage output circuit can be realized by an operational amplifier, and the circuit diagram of the differential voltage output circuit is shown in Figure 5 If the output is V+, a direct current output voltage signal V- is generated at the same time, which realizes the differential signal output of the voltage of the phase detection circuit, thereby reducing the common mode interference.

[0052] As an optional embodiment, step S103 comprises:

[0053] adjusting the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, the phase difference between the signal of the second signal source and the signal of the first signal source is -90° and 90°;

[0054] adjusting the phase of the signal of the second signal source, so that the differential output voltage of the phase detection circuit is 0V, and at this time the slope of the differential output voltage curve at the point where the differential output voltage is 0V is positive; and zeroing the phase of the signal of the second signal source, at which time the phase difference between the signal of the second signal source and the signal of the first signal source is -90°.

[0055] setting the phase of the signal of the second signal source to 90°, and zeroing the phase of the signal of the second signal source again, to complete the phase calibration of the signal source.

[0056] In this embodiment, adjusting the differential output voltage curve of the phase detection circuit specifically includes the following steps:

[0057] 1) adjusting the phase of the signal of the second signal source, so that the differential output voltage is 0V.

[0058] 2) zeroing the phase of the signal source by setting the Phase Ref Set button of the second signal source.

[0059] 3) setting the phase of the signal of the second signal source to 180°, and setting the differential output voltage at this time to aV.

[0060] 4) rotating the potentiometer of the phase detection circuit to adjust one of the output voltage signals V- of the differential voltage output circuit, so that the differential voltage in the above step 3) becomes a / 2V, and the adjustment of the differential output voltage curve is completed, at which time the differential output voltage curve is as shown in FIG. 2, and at this time, when the differential output voltage in the differential output voltage curve is 0V, the phase difference between the signal of the second signal source and the signal of the first signal source is -90° and 90°. Next, the phase of the signal of the second signal source is zeroed, and the specific steps are as follows: Figure 6

[0061] 1) adjusting the phase of the signal of the second signal source, so that the output voltage becomes 0V, and at this time the slope of the voltage change with the phase difference is positive.

[0062] 2) setting the Phase Ref Set button of the second signal source to zero the phase of the signal source, at which time the phase of the signal of the second signal source is -90° relative to the phase of the signal of the first signal source.

[0063] ​3) Set the phase of the signal of the second signal source to 90°, and set the Phase Ref Set of the second signal source again to zero the phase of the signal source. The phase calibration of the signal source is completed, and at this time, the phase parameter of the signal of the second signal source is set to obtain the phase of the actual output signal of the second signal source relative to the phase of the signal of the first signal source.

[0064] As an optional embodiment, after step S103, the method further comprises:

[0065] According to the output voltage of the phase detection circuit, the phase difference of the signal of the second signal source relative to the signal of the first signal source is obtained.

[0066] In this embodiment, the phase difference of the signal of the second signal source relative to the signal of the first signal source can be automatically obtained by connecting the signal source and a voltmeter for monitoring the output voltage on the phase detection circuit through a smart control device (such as a PC computer), so as to realize automatic control and testing.

[0067] Referring to Figure 2 , Figure 2 A module schematic diagram of a signal source phase calibration system 100 provided by a second embodiment of the present application is shown, and the system 100 comprises:

[0068] A curve acquisition module 10 is configured to acquire an output voltage curve of the phase detection circuit varying with the phase difference of two input signals.

[0069] A signal coupling module 20 is configured to couple the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a combiner.

[0070] A phase calibration module 30 is configured to perform signal source phase calibration based on the output voltage curve.

[0071] As an optional embodiment, the phase detection circuit outputs voltage through a differential voltage output circuit, and the curve acquisition module 10 is specifically configured to:

[0072] acquire a differential output voltage curve of the phase detection circuit varying with the phase difference of two input signals.

[0073] As an optional embodiment, the phase calibration module 30 is specifically configured to:

[0074] adjust the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, the phase difference of the signal of the second signal source relative to the signal of the first signal source is-90° and 90°.

[0075] adjusting the phase of the signal of the second signal source so that the differential output voltage of the phase detection circuit is 0V, and at this time the slope of the differential output voltage curve at the point where the differential output voltage is 0V is positive; and zeroing the phase of the signal of the second signal source, at which time the phase difference between the signal of the second signal source and the signal of the first signal source is -90°;

[0076] setting the phase of the signal of the second signal source to 90°, and again zeroing the phase of the signal of the second signal source, to complete the phase calibration of the signal sources.

[0077] As an optional embodiment, the signal coupling module 20 is specifically configured to:

[0078] The signal of the first signal source and the signal of the second signal source are input from two input ports of the combiner respectively, and the signal of the first signal source and the signal of the second signal source are coupled to the phase detection circuit through a microstrip line.

[0079] As an optional embodiment, the system 100 further comprises a phase difference acquisition module 40: configured to, after the phase calibration of the signal sources based on the output voltage curve, acquire the phase difference between the signal of the second signal source and the signal of the first signal source according to the output voltage of the phase detection circuit.

[0080] It should be noted that the phase calibration system 100 of the signal sources provided by the embodiments of the present application has the same specific implementation and technical effects as the foregoing method embodiments, and for brevity of description, the part of the system 100 embodiment not mentioned can be referred to the corresponding content in the foregoing method embodiments.

[0081] It should be noted that the present application can be implemented in software and / or a combination of software and hardware, for example, can be implemented by using an application specific integrated circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present application can be executed by a processor to implement the above steps or functions. Similarly, the software program of the present application (including related data structures) can be stored in a computer readable recording medium, for example, a RAM memory, a magnetic or optical drive or a soft disk and similar devices. In addition, some steps or functions of the present application can be implemented by using hardware, for example, as a circuit cooperating with the processor to execute the respective steps or functions.

[0082] The method according to the application can be implemented on a computer as a computer implemented method, or in dedicated hardware, or in a combination of both. Executable code for the method according to the application, or parts thereof, can be stored on a computer program product. Examples of computer program products include memory devices, optical storage devices, integrated circuits, servers, online software etc. Preferably, the computer program product comprises non-transitory program code means stored on a computer readable medium for performing the method according to the application when said program product is executed on a computer.

[0083] In a preferred embodiment, the computer program comprises computer program code means adapted to perform all the steps of the method according to the application when the computer program is run on a computer. Preferably, the computer program is embodied on a computer readable medium.

[0084] In summary, the embodiments of the present application acquire the output voltage curve of the phase detection circuit which varies with the phase difference of two input signals; couple the signal of the first signal source and the signal of the second signal source to the phase detection circuit through the combiner; and the phase detection circuit calibrates the phase of the signal source based on the output voltage curve. In this way, the present application calibrates the phase of the signal source through the combiner and the phase detection circuit, which is simple and convenient, thereby solving the technical problem of complex phase calibration equipment and complicated operation process of the signal source, and realizing the fast and convenient calibration of the phase of the signal source.

[0085] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A method of phase calibration of a signal source, characterized by, The method comprises the following steps: acquiring a differential output voltage curve of a phase detection circuit with respect to a phase difference change of two input signals; coupling a signal of a first signal source and a signal of a second signal source to the phase detection circuit through a combiner; performing phase calibration of the signal sources based on the output voltage curve, comprising: adjusting the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90° and 90°; adjusting the phase of the signal of the second signal source, so that the differential output voltage of the phase detection circuit is 0V, and at this time, the slope of the differential output voltage curve at the differential output voltage of 0V is positive; zeroing the phase of the signal of the second signal source, at this time, the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90°; setting the phase of the signal of the second signal source to 90°, and zeroing the phase of the signal of the second signal source again to complete the phase calibration of the signal sources.

2. The phase calibration method of a signal source according to claim 1, characterized by, The coupling of the signal of the first signal source and the signal of the second signal source to the phase detection circuit through the combiner comprises: inputting the signal of the first signal source and the signal of the second signal source from two input ports of the combiner respectively, and coupling the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a microstrip line.

3. The method of phase calibration of a signal source according to claim 1, wherein, After the phase calibration of the signal sources based on the output voltage curve, the method further comprises: obtaining the phase difference of the signal of the second signal source relative to the signal of the first signal source according to the output voltage of the phase detection circuit.

4. A phase calibration system for a signal source, characterized by The method comprises the following steps: a curve acquisition module, configured to acquire a differential output voltage curve of a phase detection circuit with respect to a phase difference change of two input signals; a signal coupling module, configured to couple a signal of a first signal source and a signal of a second signal source to the phase detection circuit through a combiner; a phase calibration module, configured to perform phase calibration of the signal sources based on the output voltage curve; the phase calibration module is specifically configured to: adjust the differential output voltage curve of the phase detection circuit, so that when the differential output voltage in the differential output voltage curve is 0V, the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90° and 90°; adjust the phase of the signal of the second signal source, so that the differential output voltage of the phase detection circuit is 0V, and at this time, the slope of the differential output voltage curve at the differential output voltage of 0V is positive; zero the phase of the signal of the second signal source, at this time, the phase difference of the signal of the second signal source relative to the signal of the first signal source is -90°; set the phase of the signal of the second signal source to 90°, and zero the phase of the signal of the second signal source again to complete the phase calibration of the signal sources.

5. The phase calibration system of a signal source according to claim 4, characterized in that, The signal coupling module is specifically configured to: input the signal of the first signal source and the signal of the second signal source from two input ports of the combiner respectively, and couple the signal of the first signal source and the signal of the second signal source to the phase detection circuit through a microstrip line. The signal of the first signal source and the signal of the second signal source are input from two input ports of the combiner respectively, and the signal of the first signal source and the signal of the second signal source are coupled to the phase detection circuit through a microstrip line.

6. The phase calibration system of a signal source according to claim 4, characterized in that, The system further comprises a phase difference obtaining module: for obtaining the phase difference between the signal of the second signal source and the signal of the first signal source according to the output voltage of the phase detection circuit after the phase calibration of the signal source based on the output voltage curve.

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