CN216599633U - Broadband high-precision frequency discriminator and testing device - Google Patents
Broadband high-precision frequency discriminator and testing device Download PDFInfo
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- CN216599633U CN216599633U CN202122955531.4U CN202122955531U CN216599633U CN 216599633 U CN216599633 U CN 216599633U CN 202122955531 U CN202122955531 U CN 202122955531U CN 216599633 U CN216599633 U CN 216599633U
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Abstract
The application discloses broadband high accuracy frequency discriminator and testing arrangement, broadband high accuracy frequency discriminator includes: a frequency divider to down-convert the coupled signal; the driving module is used for outputting a clock signal; the input end of the frequency measurement module is respectively connected with the output end of the driving module and the output end of the frequency divider, and the frequency measurement module is used for detecting the frequency information of the coupling signal; and the interface is connected with the output end of the frequency measurement module and is used for outputting the frequency information. The frequency discriminator of the embodiment of the application can meet the test requirements of high bandwidth and high precision.
Description
Technical Field
The application belongs to the technical field of 5G testing, and particularly relates to a broadband high-precision frequency discriminator and a testing device.
Background
In 5G test systems, the test equipment often has different frequency responses, and the frequency discriminator is mainly used for dynamically adjusting the system according to the working frequency of the system so as to realize higher output flatness.
With the development of communication electronic technology, 5G test equipment is more and more widely applied in the industrial and military fields, and the requirement on flatness is higher and higher. However, some conventional frequency measurement schemes, such as a capacitance charge-discharge method, a delay link method, a pulse counting method combining a single chip microcomputer and a frequency divider, cannot meet the requirements of high precision and high bandwidth, and cannot meet the requirements of a 5G test system.
SUMMERY OF THE UTILITY MODEL
The purpose of the present application is to provide a wideband high-precision frequency discrimination and measurement scheme, which is directed to the deficiencies of the prior art.
According to a first aspect of the embodiments of the present application, there is provided a wideband high-precision frequency discriminator, configured to perform frequency discrimination on a coupled signal to obtain frequency information to compensate an attenuation value of a system link; the broadband high-precision frequency discriminator comprises:
a frequency divider to down-convert the coupled signal;
the driving module is used for outputting a clock signal;
the input end of the frequency measurement module is respectively connected with the output end of the driving module and the output end of the frequency divider, and the frequency measurement module is used for detecting the frequency information of the coupling signal;
and the interface is connected with the output end of the frequency measurement module and is used for outputting the frequency information.
Optionally, the driving module includes a temperature compensation crystal oscillator;
the output end of the temperature compensation crystal oscillator is connected with the input end of the frequency measurement module, and the temperature compensation crystal oscillator is used for outputting clock signals.
Optionally, the frequency measurement module includes a signal receiving unit, a filtering unit, and a frequency measurement unit;
the input end of the signal receiving unit is connected with the output end of the frequency divider and used for receiving the coupling signal;
the input end of the filtering unit is connected with the output end of the signal receiving unit, and the filtering unit is used for removing noise of the coupled signal;
the input end of the phase-locked loop is connected with the output end of the driving module, and the phase-locked loop is used for carrying out frequency multiplication on the clock signal;
the input end of the frequency measurement unit is connected with the output end of the filtering unit and the output end of the phase-locked loop, and the frequency measurement unit is used for detecting the frequency information of the coupling signal.
Optionally, the frequency measurement unit is configured to determine frequency information of the coupled signal according to a direct frequency measurement method.
Optionally, the signal receiving unit, the filtering unit, the phase-locked loop, and the frequency measuring unit are integrated on an FPGA.
Optionally, the wideband high-precision frequency discriminator further includes:
the frequency divider is connected with the frequency measurement module through the matching circuit, and the matching circuit is used for carrying out low level conversion on the coupling signal.
Optionally, the matching circuit is specifically configured to convert the coupled signal into a low-voltage differential signal.
Optionally, the frequency divider adopts a fractional frequency divider.
Optionally, the interface is an ethernet interface.
According to a second aspect of the embodiments of the present application, there is provided a testing apparatus, including the wideband high-precision frequency discriminator according to any one of the embodiments of the first aspect.
The technical scheme of the application has the following beneficial technical effects:
the broadband high-precision frequency discriminator provided by the embodiment of the application adopts the frequency divider to reduce the frequency of the coupling signal to the range which can be directly detected by the frequency measuring module before frequency measurement, so that the testing requirement of high bandwidth can be met, and the frequency measuring module is driven by the clock signal of the driving module during testing, so that the testing precision can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a wideband high-precision frequency discriminator according to an exemplary embodiment of the present application;
fig. 2 is a schematic diagram of a wideband high-precision frequency discriminator in an exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with the detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present application. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present application.
In the drawings, a schematic diagram of a layer structure according to an embodiment of the application is shown. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.
In the description of the present application, it is noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The embodiments of the present application provide a wideband high-precision frequency discriminator, which is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides a wideband high-precision frequency discriminator for performing frequency discrimination on a coupled signal to obtain frequency information to compensate an attenuation value of a system link; the broadband high-precision frequency discriminator comprises: a frequency divider to down-convert the coupled signal; the driving module is used for outputting a clock signal; the input end of the frequency measurement module is respectively connected with the output end of the driving module and the output end of the frequency divider, and the frequency measurement module is used for detecting the frequency information of the coupling signal; and the interface is connected with the output end of the frequency measurement module and is used for outputting the frequency information.
The broadband high-precision frequency discriminator provided by the embodiment of the application adopts the frequency divider to reduce the frequency of the coupling signal to the range which can be directly detected by the frequency measuring module before frequency measurement, so that the testing requirement of high bandwidth can be met, and the frequency measuring module is driven by the clock signal of the driving module during testing, so that the testing precision can be effectively improved.
In some embodiments, the drive module comprises a temperature compensated crystal oscillator; the output end of the temperature compensation crystal oscillator is connected with the input end of the frequency measurement module, and the temperature compensation crystal oscillator is used for outputting clock signals.
Specifically, a temperature compensated crystal oscillator (TCXO), which is a temperature compensated crystal oscillator, is a quartz crystal oscillator in which an oscillation frequency variation caused by a change in ambient temperature is reduced by an additional temperature compensation circuit. The output frequency precision of the temperature compensation crystal oscillator can directly influence the system test precision, and in the embodiment, the output frequency precision of the temperature compensation crystal oscillator can be +/-1 PPM.
Compared with the frequency difference (i.e., the frequency precision is +/-10 PPM, +/-20 PPM and +/-30 PPM) of the common crystal oscillator, the temperature compensation crystal oscillator TCXO has remarkable advantages and is mainly characterized by high frequency precision (such as +/-0.2 PPM, +/-0.5 PPM, +/-1.5 PPM and +/-2.5 PPM), high stability, wide temperature range, low phase noise, low power consumption, low jitter, quick start-up time and the like. In a specific application, the frequency accuracy difference is as follows:
1. the working temperature range of the common crystal oscillator is-30 ℃ to +70 ℃, and the frequency difference is generally +/-20 PPM to +/-30 PPM.
2. The working temperature range of the wide-temperature common crystal oscillator is-40 ℃ to +85 ℃, and the frequency difference is generally +/-20 PPM to +/-25 PPM.
3. The working temperature range of the temperature compensated crystal oscillator TCXO is-40 ℃ to +85 ℃, and the frequency difference is +/-0.5 PPM to +/-2 PPM.
In some embodiments, the frequency measurement module comprises a signal receiving unit, a filtering unit and a frequency measurement unit; the input end of the signal receiving unit is connected with the output end of the frequency divider and used for receiving the coupling signal; the input end of the filtering unit is connected with the output end of the signal receiving unit, and the filtering unit is used for removing noise of the coupled signal; the input end of the phase-locked loop is connected with the output end of the driving module, and the phase-locked loop is used for carrying out frequency multiplication on the clock signal; the input end of the frequency measurement unit is connected with the output end of the filtering unit and the output end of the phase-locked loop, and the frequency measurement unit is used for detecting the frequency information of the coupling signal.
The phase-locked loop can multiply the frequency of the clock signal, for example, the frequency of the clock signal of 40MHz is multiplied to 400MHz, so that the system test precision can reach more than 10 ppm.
In some embodiments, the frequency measurement unit is configured to determine frequency information of the coupled signal according to a direct frequency measurement method.
In some embodiments, the signal receiving unit, the filtering unit, the phase locked loop and the frequency measurement unit are integrated on an FPGA.
Specifically, part or all of the signal receiving unit, the filtering unit, the phase-locked loop and the frequency measurement unit may be implemented on the FPGA through a hardware description language. The FPGA has an FPGA framework with low cost and low power consumption, an embedded memory with the height of 6.3Mb and the total power consumption less than 1.5W, and is widely applied to industries such as wireless, wired, broadcasting, industry and the like. In this embodiment, the signal receiving unit, the filtering unit, the phase-locked loop and the frequency measurement unit are integrated on the FPGA, so that a system designer can meet the ever-increasing bandwidth requirement while reducing the cost. In addition, the logic device FPGA can also realize diversified interface output schemes, thereby being beneficial to the function expansion of the system.
In some embodiments, the wideband high accuracy discriminator further comprises:
the frequency divider is connected with the frequency measurement module through the matching circuit, and the matching circuit is used for carrying out low level conversion on the coupling signal.
Specifically, after the matching circuit performs low level conversion on the coupling signal, the frequency measurement module can directly process the coupling signal (within 400 MHz), so that processing of low-frequency to direct-current signals is realized, and the processing efficiency is improved.
In some embodiments, the matching circuit is specifically configured to convert the coupled signal to a low voltage differential signal. Accordingly, the signal receiving unit may be an LVDS receiver.
In some embodiments, the frequency divider employs a fractional divider.
Specifically, the divider output is a differential, open-set output with programmable current to support different off-chip loads. In this embodiment, the frequency divider may be a high bandwidth rf frequency divider, fabricated using SiGe-BiCMOS technology, integrated with a 48-bit sigma-delta modulator (DSM), with programmable phase accumulator size, and may achieve precise control over frequency step size and resolution. The integrated DSM can generate frequencies with a frequency error close to 0 Hz. The DSM may also have built-in programmable frequency scanning capabilities with a variety of automatic and user-defined scan modes and trigger options, including hardware trigger pins or SPI triggers with selectable delay triggers.
In some embodiments, the interface is an ethernet interface.
Specifically, the gigabit Ethernet controller that the interface adopted, the gigabit Ethernet controller and FPGA of high integration degree, low-power consumption directly link, support 10/100/1000M ethernet connection, possess and receive and dispatch adaptive function, and FPGA accessible net gape communicates with the host computer, accomplishes the quick acquisition of frequency under the network mode.
In some embodiments, a wideband high accuracy frequency discriminator comprises: a frequency divider to down-convert the coupled signal; the driving module is used for outputting a clock signal; the input end of the frequency measurement module is respectively connected with the output end of the driving module and the output end of the frequency divider, and the frequency measurement module is used for detecting the frequency information of the coupling signal; the interface is connected with the output end of the frequency measurement module and is used for outputting the frequency information; the driving module comprises an FPGA (field programmable gate array), and a signal receiving unit, a filtering unit and a frequency measuring unit are integrated on the FPGA; the input end of the signal receiving unit is connected with the output end of the frequency divider and used for receiving the coupling signal; the input end of the filtering unit is connected with the output end of the signal receiving unit, and the filtering unit is used for removing noise of the coupled signal; the input end of the phase-locked loop is connected with the output end of the driving module, and the phase-locked loop is used for carrying out frequency multiplication on the clock signal; the input end of the frequency measurement unit is connected with the output end of the filtering unit and the output end of the phase-locked loop, and the frequency measurement unit is used for detecting the frequency information of the coupling signal; the interface adopts an Ethernet interface.
Specifically, the broadband high-precision frequency discriminator has the advantages of high frequency discrimination speed, high precision and convenience in connection, meets the requirements of a frequency testing system, improves the testing efficiency and precision, and enhances the reliability and safety of the testing system. In addition, based on the hardware architecture of the broadband high-precision frequency discriminator adopting the FPGA, an extensible development idea design is provided.
The embodiment of the application also provides a testing device, which comprises the broadband high-precision frequency discriminator in any one of the previous embodiments.
Specifically, the testing device may include a coupler, a wideband high-precision frequency discriminator and an attenuator, where the coupler is configured to output a coupled signal, the wideband high-precision frequency discriminator is configured to perform frequency discrimination on the coupled signal and output frequency information, and the control system may dynamically compensate an attenuation value of the link attenuator of the system according to a frequency response, so as to ensure amplitude precision of the system in a full frequency range.
The testing device of the embodiment of the application comprises the broadband high-precision frequency discriminator, has the same technical effect as the broadband high-precision frequency discriminator, and is not repeated here.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A wideband high accuracy frequency discriminator for frequency discriminating a coupled signal to obtain frequency information to compensate attenuation values of a system link, the wideband high accuracy frequency discriminator comprising:
a frequency divider to down-convert the coupled signal;
the driving module is used for outputting a clock signal;
the input end of the frequency measurement module is respectively connected with the output end of the driving module and the output end of the frequency divider, and the frequency measurement module is used for detecting the frequency information of the coupling signal;
and the interface is connected with the output end of the frequency measurement module and is used for outputting the frequency information.
2. The wideband high accuracy frequency discriminator according to claim 1, wherein said driver module comprises a temperature compensated crystal oscillator;
the output end of the temperature compensation crystal oscillator is connected with the input end of the frequency measurement module, and the temperature compensation crystal oscillator is used for outputting clock signals.
3. The wideband high accuracy frequency discriminator according to claim 1, wherein said frequency measuring module comprises a signal receiving unit, a filtering unit and a frequency measuring unit;
the input end of the signal receiving unit is connected with the output end of the frequency divider and used for receiving the coupling signal;
the input end of the filtering unit is connected with the output end of the signal receiving unit, and the filtering unit is used for removing noise of the coupling signal;
the input end of the phase-locked loop is connected with the output end of the driving module, and the phase-locked loop is used for carrying out frequency multiplication on the clock signal;
the input end of the frequency measurement unit is connected with the output end of the filtering unit and the output end of the phase-locked loop, and the frequency measurement unit is used for detecting the frequency information of the coupling signal.
4. The wideband high accuracy frequency discriminator according to claim 3, wherein said frequency measuring unit is configured to determine frequency information of said coupled signal according to a direct frequency measurement method.
5. The wideband high accuracy frequency discriminator according to claim 3, wherein said signal receiving unit, said filtering unit, said phase locked loop and said frequency measuring unit are integrated on an FPGA.
6. The wideband high accuracy frequency discriminator according to claim 1, wherein said wideband high accuracy discriminator further comprises:
the frequency divider is connected with the frequency measurement module through the matching circuit, and the matching circuit is used for carrying out low level conversion on the coupling signal.
7. The wideband high accuracy frequency discriminator according to claim 6, wherein said matching circuit is specifically configured to convert said coupled signal to a low voltage differential signal.
8. The wideband high accuracy discriminator of claim 1, wherein said divider is a fractional divider.
9. The wideband high accuracy frequency discriminator according to claim 1, wherein said interface is an ethernet interface.
10. A test apparatus comprising a wideband high accuracy frequency discriminator according to any of claims 1 to 9.
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| CN202122955531.4U CN216599633U (en) | 2021-11-29 | 2021-11-29 | Broadband high-precision frequency discriminator and testing device |
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| CN202122955531.4U CN216599633U (en) | 2021-11-29 | 2021-11-29 | Broadband high-precision frequency discriminator and testing device |
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