CN110927453B - Testing device and testing method of phase shifter - Google Patents
Testing device and testing method of phase shifter Download PDFInfo
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- CN110927453B CN110927453B CN201911191128.XA CN201911191128A CN110927453B CN 110927453 B CN110927453 B CN 110927453B CN 201911191128 A CN201911191128 A CN 201911191128A CN 110927453 B CN110927453 B CN 110927453B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/04—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents involving adjustment of a phase shifter to produce a predetermined phase difference, e.g. zero difference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
Abstract
The invention provides a testing device and a testing method of a phase shifter, the phase shifter is used for generating a transmitting signal according to a first radio signal provided by a first signal source, the testing device comprises: the signal receiving and mixing module is connected with the first signal source and used for receiving the second radio signal and mixing the second radio signal and the first radio signal to generate a first mixing signal; the oscilloscope is connected with the receiving frequency mixing module and is used for displaying the phase information of the first frequency mixing signal in real time; the second radio signal is an echo signal generated by a transmitting signal or a target object reflecting the transmitting signal, and the oscilloscope is further used for acquiring the phase change of the first mixing signal during the phase adjustment of the phase shifter. The testing device provided by the invention reduces the measurement cost of the phase offset of the phase shifter.
Description
Technical Field
The invention relates to the technical field of phase shifter testing, in particular to a testing device and a testing method of a phase shifter.
Background
Phase shifters are important components of transceiver systems for radio signals (e.g., radio frequency signals, microwave signals, etc.), which can be used to phase adjust incoming radio signals.
For a phase shifter of an independent element, conventionally, an input/output port of the phase shifter is respectively connected to two ports of a vector network analyzer, so as to obtain a phase shift amount of the phase shifter by measuring a scattering parameter between the ports.
However, the cost is high, and the method for measuring the phase shift amount of the phase shifter is expensive and inconvenient.
Disclosure of Invention
The invention provides a testing device and a testing method of a phase shifter, and the testing device reduces the measuring cost of the phase shift amount of the phase shifter.
An embodiment of the present invention provides a testing apparatus for a phase shifter, where the phase shifter may be configured to generate a transmission signal according to a first radio signal provided by a first signal source, and the testing apparatus may include:
the signal receiving and mixing module is connected with the first signal source and can be used for receiving a second radio signal and mixing the second radio signal and the first radio signal to generate a first mixing signal; and
the oscilloscope is connected with the receiving frequency mixing module and is used for displaying the phase information of the first frequency mixing signal in real time;
the second radio signal is an echo signal generated by a transmitting signal or a target object reflecting the transmitting signal, and the oscilloscope is further used for acquiring the phase change of the first mixing signal during the phase adjustment of the phase shifter.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, the signal receiving and mixing module includes a first amplifier, a first mixer, and a second amplifier, which are connected in sequence;
the signal input end of the first amplifier is used for receiving a second radio signal, and the two signal input ends of the first mixer are respectively connected with the signal output end of the first amplifier and a first signal source; and
the signal input end of the second amplifier is connected with the signal output end of the first mixer, and the signal output end of the second amplifier is connected with the signal input end of the oscilloscope.
Optionally, the testing apparatus for a phase shifter provided in the embodiments of the present invention, the phase shifter is integrated in a radio frequency device, and
the first signal source is a radio frequency signal source.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, when the second radio signal is an echo signal generated by a target reflecting the transmission signal, the radio frequency device may further include a transmission antenna and a reception antenna;
the signal output end of the phase shifter is connected with the transmitting antenna and used for transmitting a transmitting signal by using the transmitting antenna; and
the signal receiving and mixing module is connected with the receiving antenna and used for receiving the second radio signal.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, when the second radio signal is a transmission signal, the radio frequency device further includes a baseband signal source and a second mixer;
two signal input ends of the second mixer are respectively connected with the baseband signal source and the radio frequency signal source and are used for carrying out frequency mixing processing on the baseband signal provided by the baseband signal source and the radio frequency signal provided by the radio frequency signal source to generate a second frequency mixing signal;
the signal receiving end of the phase shifter is connected with the signal output end of the second frequency mixer and used for generating a transmitting signal according to the second frequency mixing signal; and
and the signal input end of the signal receiving and mixing module is connected with the signal output end of the phase shifter and used for receiving a second radio signal.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, the trigger end of the oscilloscope is connected to the baseband signal source, and the signal input end of the oscilloscope is connected to the signal output end of the receiving and mixing module.
Optionally, the testing apparatus for a phase shifter provided in the embodiment of the present invention further includes:
and the connecting piece is used for physically connecting the signal output end of the phase shifter with the signal input end of the signal receiving and mixing module.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, the transmission signal is a millimeter wave radar signal.
Optionally, in the testing apparatus for a phase shifter provided in the embodiment of the present invention, the phase shifter includes a third amplifier, a phase shifter body, and a fourth amplifier, which are connected in sequence;
the signal input end of the third amplifier is used as the signal input end of the phase shifter, and the signal output end of the fourth amplifier is used as the signal output end of the phase shifter.
In an alternative embodiment of the present invention, there is also provided a test apparatus for a phase shifter for generating a transmission signal according to a first radio signal provided by a first signal source, the test apparatus including:
the signal receiving and mixing module is connected with the first signal source and used for receiving the second radio signal and mixing the second radio signal and the first radio signal to generate a first mixing signal;
the phase information acquisition module is connected with the signal receiving and mixing module and is used for acquiring the phase information of the first mixing signal in real time;
the adjusting module is connected with the phase shifter and used for adjusting the phase of the transmitting signal output by the phase shifter; and
the calculating module is connected with the phase information acquiring module and used for calculating and outputting the phase change of the first mixing signal when the phase of the phase shifter is adjusted according to the phase information output by the phase information acquiring module;
the second radio signal is a transmitting signal or an echo signal generated by reflecting the transmitting signal by the target object.
The embodiment of the invention also provides a test method of the phase shifter, the phase shifter generates a transmitting signal based on the first radio signal provided by the first signal source, and the test method comprises the following steps:
acquiring a second radio signal;
mixing the second radio signal and the first radio signal to obtain a first mixing signal;
adjusting phase parameters of the phase shifter to obtain phase change of the first mixing signal; and
obtaining a phase offset of the phase shifter based on the phase change value of the first mixing signal and the phase adjustment value of the phase shifter;
the second radio signal is a transmitting signal or an echo signal generated by reflecting the transmitting signal by the target object.
Optionally, the transmission signal may include, but is not limited to, a radio signal such as a millimeter wave signal or a microwave signal.
According to the testing device and the testing method for the phase shifter, provided by the embodiment of the invention, by arranging the signal receiving and mixing module and the oscilloscope, the signal receiving and mixing module is respectively connected with the phase shifter to be tested and the first signal source used for sending the first radio signal, the signal receiving and mixing module is used for receiving the transmission signal of the phase shifter to obtain the second radio signal, and the signal receiving and mixing module is used for carrying out mixing processing on the second radio signal and the first radio signal sent by the first signal source to generate the first mixing signal. The phase information of the first mixing signal is displayed in real time through an oscilloscope connected with the receiving mixing module, the oscilloscope acquires the phase change of the first mixing signal when the phase of the phase shifter is adjusted, and the phase change of the phase shifter is represented through the phase change of the first mixing signal. The phase change of the phase shifter can be detected without using a vector network analyzer, the use is convenient, and the measurement cost of the phase offset of the phase shifter is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention;
FIG. 2 is a second schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a method for testing a phase shifter according to an embodiment of the present invention.
Description of reference numerals:
10-a phase shifter; 101-a third amplifier; 102-a phase shifter body; 103-a fourth amplifier; 20-a first signal source; 30-a signal receiving mixing module; 301-a first amplifier; 302-a first mixer; 303-a second amplifier; 40-an oscilloscope; 50-a transmitting antenna; 60-a receiving antenna; 70-a target; 80-baseband signal source; 90-a second mixer; 100-a connector; 110-a phase information acquisition module; 120-an adjustment module; 130-calculation module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a first schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention. Referring to fig. 1, an embodiment of the present invention provides a testing apparatus for a phase shifter, in which a phase shifter 10 is used to generate a transmission signal according to a first radio signal provided by a first signal source 20, and the testing apparatus may include a signal receiving and mixing module 30, an oscilloscope 40, and the like.
The signal receiving and mixing module 30 may be connected to the phase shifter 10 and the first signal source 20, respectively, and the signal receiving and mixing module 30 may be configured to receive the transmission signal output by the phase shifter 10 as a second radio signal, and mix the second radio signal with the first radio signal to generate a first mixed signal. The signal receiving/mixing module 30 may be configured to receive an echo signal generated from the transmission signal output from the target reflection phase shifter 10, and perform subsequent mixing processing on the echo signal as a second radio signal. That is, the second wireless signal may be a transmission signal output by the phase shifter 10, or an echo signal formed by reflecting the transmission signal from a target, and the like, and may be specifically adjusted according to actual test requirements and test environments.
The oscilloscope 40 is connected to the receiving and mixing module 30, and the oscilloscope 40 is configured to display phase information of the first mixing signal in real time.
The oscilloscope 40 is further configured to obtain a phase change of the first mixing signal during the phase adjustment of the phase shifter 10.
Specifically, the first signal source 20 is used for generating a first radio signal. The phase shifter 10 is used for phase adjusting the signal passing through the phase shifter 10, and the first radio signal is phase adjusted by the phase shifter 10 to generate a transmission signal.
It should be noted that the test apparatus in the embodiment of the present application is applicable to different types of phase shifters. For example, for a phase shifter serving as an individual component, by using the embodiment of the present application, the test of parameters such as the phase offset of the phase shifter can be completed by adding the signal receiving and mixing module and the oscilloscope. Meanwhile, for the phase shifter serving as an integrated device, namely the phase shifter is integrated in an applied system (for example, an integrated radar system such as a vehicle-mounted radar chip), the conventional vector network analyzer cannot complete measurement of each parameter of the phase shifter, and the signal receiving and frequency mixing module and the oscilloscope in the embodiment of the application can complete testing of parameters such as phase offset of the integrated phase shifter, so that the testing flexibility is high, the testing cost is low, the signal receiving and frequency mixing module can be formed by corresponding components in the system where the phase shifter is located, and the testing simplicity can be further reduced. That is, the signal receiving and mixing module in the testing device of the phase shifter for the integrated device can be a newly added module, and the required signal receiving and mixing module can be formed by changing the line routing by using the components of the existing system, so as to be compatible with the applied system to the maximum extent.
As shown in fig. 1, when performing a test of phase shift amount and the like based on a transmission signal output by the phase shifter 10, an input end of the phase shifter 10 may be directly connected to the first signal source 20 through a cable, and an output end of the phase shifter 10 may be directly connected to the signal receiving and mixing module 30, that is, the second radio signal received by the signal receiving and mixing module 30 is the transmission signal output by the phase shifter 10, and this embodiment may be applied to various systems that are easy to wire. When a phase offset or the like is tested based on a reflected signal (i.e., an echo signal) of the transmission signal output by the phase shifter 10, the transmission signal is transmitted from the output end of the phase shifter 10 through the transmitting antenna, and the signal receiving and mixing module 30 can receive the echo signal formed by the reflection of the transmission signal by the target object through the receiving antenna, that is, the second radio signal received by the signal receiving and mixing module 30 is the echo signal mentioned above.
The signal receiving and mixing module 30 is configured to receive a plurality of signals and mix the received signals. In this embodiment, the signal receiving and mixing module 30 receives the first radio signal provided by the first signal source 20, and also receives the echo signal or the transmission signal output by the phase shifter 10, etc. as the second radio signal, and mixes the second radio signal with the first radio signal to generate the first mixed signal. The mechanism of the signal receiving and mixing module 30 is not limited in this application, for example, the signal receiving and mixing module 30 may be an integrated chip, or the signal receiving and mixing module 30 is formed by connecting a plurality of components.
The oscilloscope 40 is an electronic measuring instrument. The oscilloscope 40 may transform the signal into an image that is convenient for the user to observe. The oscilloscope 40 can display the waveform curves of different signal amplitudes along with time, and can also display voltage, current, frequency, phase difference, amplitude adjustment and the like. In alternative embodiments, other instrumentation may be used in place of the oscilloscope 40 to measure and display the phase information of the first mixed signal, i.e., as long as it is capable of displaying, recording, etc. the phase information of the signal in real time.
In this embodiment, the first signal source 20 is connected to the phase shifter 10, the first signal source 20 generates a first radio signal, the first radio signal is transmitted to the phase shifter 10, the phase shifter 10 performs phase adjustment on the first radio signal to generate a transmission signal, and the transmission signal may be used as a second radio signal, or an echo signal formed by reflecting the transmission signal by a target may be used as the second radio signal. The signal receiving and mixing module 30 receives the second radio signal. And the signal receiving and mixing module 30 mixes the first radio signal and the second radio signal generated by the first signal source 20 to generate a first mixed signal. The first mixing signal is output to the oscilloscope 40, and the oscilloscope 40 displays and records the phase information of the first mixing signal in real time.
When the phase of the phase shifter 10 is adjusted, the first radio signal is unchanged, the transmission signal is the transmission signal (which may be called an adjusted transmission signal) after the phase of the phase shifter 10 is adjusted, the second radio signal is the second radio signal (which may be called an adjusted second radio signal) after the phase of the phase shifter 10 is adjusted, the first mixing signal is the first mixing signal (which may be called an adjusted first mixing signal) after the phase of the phase shifter 10 is adjusted, the phase information of the first mixing signal is displayed and recorded and adjusted in real time by the oscilloscope 40, the oscilloscope 40 simultaneously displays and records the phase information of the adjusted first mixing signal and the phase information of the first mixing signal, and the change in the phase of the first mixing signal during the phase adjustment of the phase shifter 10 can be obtained by the oscilloscope 40. Since the first radio signal in the first mixing signal and the adjusted first mixing signal are the same, the phases of the adjusted transmission signal, the adjusted second radio signal, and the adjusted first mixing signal output from the phase shifter 10 are unchanged, and the phases of the transmission signal, the second radio signal, and the first mixing signal output from the phase shifter 10 are unchanged, the phase change of the first mixing signal may indicate the phase change of the phase shifter 10.
Optionally, the testing apparatus in this embodiment of the present application may further include an adjusting module, a calculating module, and a comparing module (not shown in the figure), where the adjusting module may be connected to the adjustment control end of the phase shifter 10, and the adjusting module and the oscilloscope 40 may be connected to the calculating module; that is, the adjusting module may be configured to adjust the phase value of the phase shifter 10 and record the phase adjustment value, and the calculating module may be configured to obtain the phase value recorded by the oscilloscope 40 and other devices before and after the phase shifter 10 is adjusted and calculate the phase difference obtained by the oscilloscope 40 and other devices before and after the phase shifter 10 is adjusted (where the phase difference may also be calculated by the oscilloscope 40 and other devices and output to the comparing module). The comparison module obtains the phase shift amount of the phase shifter 10 according to the phase adjustment value and the phase difference.
According to the testing device for the phase shifter provided by the embodiment of the invention, through the signal receiving and mixing module 30 and the oscilloscope 40, the signal receiving and mixing module 30 is respectively connected with the phase shifter 10 to be tested and the first signal source 20 for sending out the first radio signal, the signal receiving and mixing module 30 is used for receiving the transmission signal of the phase shifter 10 to obtain the second radio signal, and the signal receiving and mixing module 30 is used for mixing the second radio signal and the first radio signal sent out by the first signal source 20 to generate the first mixing signal. The oscilloscope 40 connected to the receiving and mixing module 30 displays the phase information of the first mixing signal in real time, and the oscilloscope 40 obtains the phase change of the first mixing signal when the phase of the phase shifter 10 is adjusted, and the phase change of the phase shifter 10 is represented by the phase change of the first mixing signal. The phase change of the phase shifter 10 can be detected without using a vector network analyzer, the use is convenient, and the measurement cost of the phase offset of the phase shifter is reduced.
Example two
Fig. 2 is a schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention. Referring to fig. 2, in the testing apparatus of the phase shifter according to the first embodiment, the signal receiving and mixing module 30 may include a first amplifier 301, a first mixer 302, a second amplifier 303, and the like, which are connected in sequence.
Wherein, the signal input end of the first amplifier 301 is used for receiving the second radio signal, and two signal input ends of the first mixer 302 are respectively connected with the signal output end of the first amplifier 301 and the first signal source 20; and
the signal input terminal of the second amplifier 303 is connected to the signal output terminal of the first mixer 302, and the signal output terminal of the second amplifier 303 is connected to the signal input terminal of the oscilloscope 40.
The first amplifier 301 and the second amplifier 303 are used to amplify the voltage or power of the electrical signal. The electric signal is lost during transmission, so that the electric signal needs to be amplified. The first amplifier 301 and the second amplifier 303 amplify the electrical signals as required. Alternatively, the first amplifier 301 and/or the second amplifier 303 may employ a low noise amplifier. Under the condition of amplifying weak signals, the noise of the amplifier per se has larger interference on the signals, and the low-noise amplifier is adopted to reduce the noise of the amplifier per se so as to improve the signal-to-noise ratio of the output.
Specifically, the first amplifier 301 is connected to the phase shifter 10 by wire or wirelessly, and the first amplifier 301 is configured to receive the second radio signal and amplify the second radio signal. The amplified second radio signal output by the first amplifier 301 and the first radio signal generated by the first signal source 20 are both input to the first mixer 302, and are mixed in the first mixer 302 to obtain a first mixed signal, which is transmitted to the oscilloscope 40 through the second amplifier 303.
The testing device for the phase shifter provided by the embodiment can be suitable for phase testing of an individual phase shifter and also suitable for phase testing of the phase shifter in an integrated device. In some embodiments, the test apparatus for a phase shifter may also perform a phase test on an output of a radio frequency phase shifter integrated in a system, directly perform a phase test on the output of the radio frequency phase shifter, obtain the output of the radio frequency phase shifter in an indirect manner, and even perform a phase test on an echo signal formed by obtaining the output of the radio frequency phase shifter. The following is a detailed description with reference to specific examples.
EXAMPLE III
Fig. 3 is a schematic structural diagram three of a testing apparatus for phase shifters according to an embodiment of the present invention. Referring to fig. 3, in the present embodiment, the phase shifter 10 is integrated in a radio frequency device, wherein the first signal source 20 is a radio frequency signal source.
The first radio signal provided by the first signal source 20 includes a radio frequency signal, a microwave signal, and the like, and the radio frequency signal may include a millimeter wave signal, a centimeter wave signal, and the like. The phase testing method is applicable to phase testing of the phase shifter 10 in a radar chip, wherein the radar chip can be an Aip (packaged antenna) millimeter wave radar chip.
In a specific implementation, the rf device may further include a transmitting antenna 50, a receiving antenna 60, and the like;
the signal output end of the phase shifter 10 is connected with the transmitting antenna 50, and the phase shifter 10 is used for transmitting a transmitting signal by using the transmitting antenna 50; the signal receiving and mixing module 30 is connected to the receiving antenna 60, and the signal receiving and mixing module 30 is configured to receive a second radio signal;
the second radio signal may be an echo signal generated by the target 70 reflecting the transmission signal.
Specifically, the phase shifter 10 includes a third amplifier 101, a phase shifter body 102, and a fourth amplifier 103, which are connected in sequence;
wherein, the signal input terminal of the third amplifier 101 is used as the signal input terminal of the phase shifter 10, and the signal output terminal of the fourth amplifier 103 is used as the signal output terminal of the phase shifter 10.
Alternatively, the third amplifier 101 and/or the fourth amplifier 103 may employ a low noise amplifier.
In the present embodiment, the phase shifter 10 and the signal receiving and mixing module 30 are connected to each other through the transmitting antenna 50 and the receiving antenna 60. The transmitting antenna 50 radiates the transmitting signal output by the phase shifter 10 into space in the form of electronic wave, and the transmitting signal is reflected to generate an echo signal after encountering the target object 70, where the echo signal is the second radio signal, the receiving antenna 60 receives the echo signal, and the receiving antenna 60 sends the echo signal to the signal receiving and mixing module 30. The output of the first signal source 20 is sent to the phase shifter 10 and the signal receiving and mixing module 30, and the first signal source 20 needs to have a waveform supporting the output of the frequency sweep, i.e. the waveform with the frequency varying with time.
The first radio signal output by the first signal source 20 can be respectively sent to the phase shifter 10 and the signal receiving and mixing module 30, the phase shifter 10 sends the transmission signal generated according to the first radio signal provided by the first signal source 20 to the transmitting antenna 50, the transmitting antenna 50 sends the transmission signal out, and then the transmission signal encounters the target 70 and is reflected to generate an echo signal, the echo signal is received by the receiving antenna 60 and is sent to the first amplifier 301, the echo signal is sent to the first mixer 302 through the first amplifier 301, so the first mixer 302 has two input signals, the first input signal is the first radio signal of the radio frequency signal source (i.e. the first signal source 20), the second input signal is the echo signal generated by reflecting the transmission signal through the target 70, the first radio signal and the echo signal can be signals with linear frequency changing with time, but the echo signal is transmitted through the receiving antenna 60 and is reflected by the target 70, more distance is taken. Therefore, at the same time, the frequency of the echo signal in the first mixer 302 is greater than the frequency of the first radio signal from the radio frequency signal source, and the first mixer 302 can extract the difference between the two frequencies to obtain the baseband signal, where the phase of the baseband signal is controlled by the measured radio frequency phase shifter 10, that is, the phase of the baseband signal is correspondingly changed by adjusting the phase of the phase shifter 10. Therefore, the phase of the measured rf phase shifter 10 can be obtained by analyzing the phase of the baseband signal.
In the above embodiment, the phase shifter 10 and the signal receiving and mixing module 30 are connected by wireless. In some embodiments, the phase shifter 10 and the signal receiving and mixing module 30 are connected by a connection 100, and the connection 100 physically connects between a signal output terminal of the phase shifter 10 and a signal input terminal of the signal receiving and mixing module 30. For example, the connector 100 may be a cable or PCB trace. The following is a detailed description of specific embodiments.
Example four
Fig. 4 is a fourth schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention. Referring to fig. 4, in the present embodiment, the phase shifter 10 is integrated in a radio frequency device, and the radio frequency device further includes a baseband signal source 80 and a second mixer 90;
two signal input ends of the second mixer 90 are respectively connected to the baseband signal source 80 and the radio frequency signal source (i.e., the first signal source 20), and the second mixer 90 is configured to mix the baseband signal provided by the baseband signal source 80 and the radio frequency signal provided by the radio frequency signal source to generate a second mixed signal;
a signal receiving end of the phase shifter 10 is connected to a signal output end of the second mixer 90, and the phase shifter 10 is configured to generate a transmitting signal according to the second mixing signal;
a signal input end of the signal receiving and mixing module 30 is connected with a signal output end of the phase shifter 10, and the signal receiving and mixing module 30 is configured to receive a second radio signal;
wherein the second radio signal is a transmission signal.
The trigger terminal of the oscilloscope 40 is connected to the baseband signal source 80, and the signal input terminal of the oscilloscope 40 is connected to the signal output terminal of the receiving and mixing module 30.
Specifically, the second mixer 90 receives a first radio signal provided by the radio frequency signal source and a baseband signal provided by the baseband signal source 80 at the same time, mixes the first radio signal and the baseband signal to generate a second mixing signal, and then sends the second mixing signal to the phase shifter 10, and the phase shifter 10 transmits the second mixing signal as a transmission signal to the signal receiving and mixing module 30.
The signal receiving and mixing module 30 receives the transmitting signal (i.e. the second mixing signal) and the first radio signal at the same time to obtain a first mixing signal, and outputs the first mixing signal to the second amplifier 303. At this time, the first mixed signal output from the second amplifier 303, which has the same frequency as the baseband signal supplied from the baseband signal source 80, is simultaneously fed into the oscilloscope 40. In the oscilloscope 40, a baseband signal source is used as a trigger signal, and when the phase of the radio frequency phase shifter 10 to be measured is adjusted, the phase change of the first mixing signal output by the second amplifier 303 is observed, that is, the phase change corresponds to the phase change of the radio frequency phase shifter 10.
In some embodiments, the transmitted signal is a millimeter wave radar signal. The test device provided by the embodiment can be applied to measurement of the phase shifter 10 in the integrated radar system. Such as millimeter wave radar chips, etc.
EXAMPLE five
Fig. 5 is a fourth schematic structural diagram of a testing apparatus for phase shifters according to an embodiment of the present invention. Referring to fig. 5, the testing apparatus of the phase shifter provided in this embodiment, the phase shifter 10 is used for generating a transmission signal according to a first radio signal provided by a first signal source 20, and the testing apparatus includes:
the signal receiving and mixing module 30 is connected to the first signal source 20, and the signal receiving and mixing module 30 is configured to receive the second radio signal and perform mixing processing on the second radio signal and the first radio signal to generate a first mixing signal;
a phase information obtaining module 110, connected to the signal receiving and mixing module 30, for obtaining phase information of the first mixing signal in real time;
an adjusting module 120, connected to the phase shifter 10, for adjusting the phase of the transmission signal output by the phase shifter 10; and
a calculating module 130, connected to the phase information acquiring module 110, for calculating and outputting a phase change of the first mixing signal during phase adjustment of the phase shifter 10 according to the phase information output by the phase information acquiring module 110;
the second radio signal is a transmitting signal or an echo signal generated by reflecting the transmitting signal by the target object.
In this embodiment, the first signal source 20 is connected to the phase shifter 10, the first signal source 20 generates a first radio signal, the first radio signal is transmitted to the phase shifter 10, the phase shifter 10 performs phase adjustment on the first radio signal to generate a transmission signal, and the transmission signal may be used as a second radio signal, or an echo signal formed by reflecting the transmission signal by a target may be used as the second radio signal. The signal receiving and mixing module 30 receives the second radio signal. And the signal receiving and mixing module 30 mixes the first radio signal and the second radio signal generated by the first signal source 20 to generate a first mixed signal.
The first mixing signal is output to the phase information obtaining module 110, and the phase information obtaining module 110 is used to obtain the phase information of the first mixing signal in real time. The adjusting module 120 is connected to the adjusting control end of the phase shifter 10, and adjusts the phase value of the phase shifter 10 through the adjusting module 120, and records the phase adjusting value; the calculating module 130 is connected to the phase information acquiring module 110, and the calculating module 130 calculates and outputs a phase change of the first mixing signal when the phase of the phase shifter 10 is adjusted according to the phase information output by the phase information acquiring module 110, and the phase change of the phase shifter 10 is indicated by the phase change of the first mixing signal.
The testing apparatus for a phase shifter provided in this embodiment is applicable to different types of phase shifters, and utilizes the phase shifter as a separate component or a phase shifter integrated in a system to indicate a phase change of the phase shifter by a phase change of a first mixed signal formed by mixing a second radio signal with a first radio signal. The phase change of the phase shifter can be detected without using a vector network analyzer, the use is convenient, and the measurement cost of the phase offset of the phase shifter is reduced.
Optionally, as shown in fig. 5, in the above embodiment, the phase information obtaining module 110 may directly obtain, in real time, phase information of the first mixing signal output by the signal receiving mixing module, and output the phase information to the calculating module 130; meanwhile, the calculation module 130 may further obtain the adjustment information with the adjustment module 120, and the calculation module 130 may further calculate and output the phase change according to the adjustment information and the received phase information, thereby implementing the automatic measurement of the phase shifter.
For example, the adjustment information may include a start time of an adjustment operation and a phase adjustment value of the phase shifter 10, the calculation module 130 may calculate a phase difference of the received first mixing signal at the start time, then calculate a phase offset of the phase shifter 10 according to a difference between the phase adjustment value and the phase difference of the first mixing signal, and directly output the phase offset, the start time, the phase adjustment value, the phase difference, and other information to other devices for subsequent operations, for example, output to a display device for display, so as to facilitate query of a measurement result, thereby implementing automatic measurement of the phase offset of the phase shifter 10.
EXAMPLE six
Fig. 6 is a flowchart illustrating a method for testing a phase shifter according to an embodiment of the present invention. Referring to fig. 6, the phase shifter 10 generates a transmission signal based on a first radio signal provided by a first signal source 20, and the test method includes:
s101, acquiring a second radio signal. The second radio signal is a transmission signal output by the phase shifter, or an echo signal formed by the reflection of the transmission signal output by the phase shifter by the target object.
In the fourth embodiment, when the second radio signal is a transmitting signal, the method for acquiring the second radio signal is described in detail in the fourth embodiment, which is not repeated herein.
When the second radio signal is an echo signal formed by the target reflecting the emission signal, the method for acquiring the second radio signal has been described in detail in the third embodiment, which is not repeated herein.
S102, mixing the second radio signal and the first radio signal to obtain a first mixing signal.
Wherein the first radio signal is generated by a first signal source. The second radio signal and the first radio signal are simultaneously transmitted to the mixer, and the mixer performs mixing processing to obtain a first mixing signal.
S103, adjusting phase parameters of the phase shifter to obtain phase change of the first mixing signal; and
the phase shift of the phase shifter is obtained based on the phase change value of the first mixed signal and the phase adjustment value of the phase shifter.
In particular, the phase parameters of the phase shifter can be adjusted by the adjusting element. Specifically, the regulating part can be a manipulator, and the manipulator is controlled through the controller, so that the manipulator regulates the phase parameters of the phase shifter according to requirements.
The first mixing signal can be transmitted to a processor, the processor is connected with an oscilloscope, phase information of the first mixing signal is recorded through the processor, phase change of the first mixing signal is calculated during phase adjustment of the phase shifter, and the phase information of the first mixing signal and the phase change of the first mixing signal calculated during phase adjustment of the phase shifter are transmitted to the oscilloscope.
The method for testing a phase shifter according to this embodiment may be applied to different types of phase shifters (e.g., a discrete component or an integrated component), and utilize a phase shifter as a separate component or a phase shifter integrated in a system to obtain a first mixing signal by mixing a second radio signal with a first radio signal, and obtain a phase change of the first mixing signal by observing and calculating with an oscilloscope, or automatically obtain a phase change of the first mixing signal by using a calculation device, so as to obtain a phase offset of the phase shifter. The phase change of the phase shifter can be detected without using a vector network analyzer, the use is convenient, and the measurement cost of the phase offset of the phase shifter is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A test apparatus for a phase shifter, the phase shifter being configured to generate a transmit signal based on a first radio signal provided by a first signal source, the test apparatus comprising:
the signal receiving and mixing module is connected with the first signal source and used for receiving a second radio signal and mixing the second radio signal and the first radio signal to generate a first mixing signal; and
the oscilloscope is connected with the receiving frequency mixing module and is used for displaying the phase information of the first frequency mixing signal in real time;
the second radio signal is an echo signal generated by the transmission signal or the reflection of the transmission signal by the target object, and the oscilloscope is further configured to obtain a phase change of the first mixing signal during the phase adjustment of the phase shifter.
2. The testing device of claim 1, wherein the signal receiving and mixing module comprises a first amplifier, a first mixer and a second amplifier connected in sequence;
the signal input end of the first amplifier is used for receiving the second radio signal, and the two signal input ends of the first mixer are respectively connected with the signal output end of the first amplifier and the first signal source; and
and the signal input end of the second amplifier is connected with the signal output end of the first mixer, and the signal output end of the second amplifier is connected with the signal input end of the oscilloscope.
3. The test apparatus of claim 1, wherein the phase shifter is integrated into a radio frequency device, and
the first signal source is a radio frequency signal source; and/or
The transmitting signal is a millimeter wave radar signal.
4. The testing device of claim 3, wherein when the second radio signal is an echo signal generated by a target object reflecting the transmitting signal, the radio frequency device further comprises a transmitting antenna and a receiving antenna;
the signal output end of the phase shifter is connected with the transmitting antenna and used for transmitting the transmitting signal by using the transmitting antenna; and
and the signal receiving and mixing module is connected with a receiving antenna and used for receiving the second radio signal.
5. The testing apparatus of claim 3, wherein when the second radio signal is the transmission signal, the radio frequency device further comprises a baseband signal source and a second mixer;
two signal input ends of the second mixer are respectively connected with the baseband signal source and the radio frequency signal source and are used for carrying out frequency mixing processing on the baseband signal provided by the baseband signal source and the radio frequency signal provided by the radio frequency signal source to generate a second frequency mixing signal;
the signal receiving end of the phase shifter is connected with the signal output end of the second mixer and used for generating the transmitting signal according to the second mixing signal; and
and the signal input end of the signal receiving and mixing module is connected with the signal output end of the phase shifter and is used for receiving the second radio signal.
6. The testing device of claim 5, wherein the trigger terminal of the oscilloscope is connected to the baseband signal source, and the signal input terminal of the oscilloscope is connected to the signal output terminal of the receiving and mixing module.
7. The testing device of claim 5, further comprising:
and the connecting piece is used for physically connecting the signal output end of the phase shifter with the signal input end of the signal receiving and mixing module.
8. The test device according to any one of claims 1 to 7, wherein the phase shifter comprises a third amplifier, a phase shifter body and a fourth amplifier connected in series;
and a signal input end of the third amplifier is used as a signal input end of the phase shifter, and a signal output end of the fourth amplifier is used as a signal output end of the phase shifter.
9. A test apparatus for a phase shifter, the phase shifter being configured to generate a transmit signal based on a first radio signal provided by a first signal source, the test apparatus comprising:
the signal receiving and mixing module is connected with the first signal source and used for receiving a second radio signal and mixing the second radio signal and the first radio signal to generate a first mixing signal;
the phase information acquisition module is connected with the signal receiving and frequency mixing module and is used for acquiring the phase information of the first frequency mixing signal in real time;
the adjusting module is connected with the phase shifter and used for adjusting the phase of the transmitting signal output by the phase shifter; and
the calculation module is connected with the phase information acquisition module and used for calculating and outputting the phase change of the first mixing signal when the phase of the phase shifter is adjusted according to the phase information output by the phase information acquisition module;
wherein the second radio signal is an echo signal generated by the emission signal or a target object reflecting the emission signal.
10. A method of testing a phase shifter, the phase shifter generating a transmission signal based on a first radio signal provided by a first signal source, the method comprising:
acquiring a second radio signal;
mixing the second radio signal with the first radio signal to obtain a first mixing signal;
adjusting a phase parameter of the phase shifter to obtain a phase change of the first mixing signal; and
obtaining a phase offset of the phase shifter based on a phase change value of the first mixing signal and a phase adjustment value of the phase shifter;
wherein the second radio signal is an echo signal generated by the emission signal or a target object reflecting the emission signal.
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