A measurement circuit and method for multi-channel same-frequency signals

Abstract

The present invention is applicable to the technical field of integrated circuits, and provides a circuit and method for measuring multi-channel signals of the same frequency, wherein the measuring circuit comprises: a power divider, receiving a reference signal, and dividing the reference signal into a first signal and a second signal; a comb spectrum signal generator, generating a plurality of comb spectrum signals according to the first signal; a plurality of branches, each branch mixing the comb spectrum signal and a signal to be measured to obtain a mixed signal, and filtering and amplifying the mixed signal to obtain and output a first target signal; a combiner, combining and outputting the first target signals; an analog-to-digital converter, taking the second signal as a reference signal, performing analog-to-digital conversion on the first target signal to obtain a second target signal; and a processor, processing and calculating the second target signal to obtain the frequency and power of the signal to be measured, and the problems of low measurement efficiency and high measurement cost of multi-channel signals of the same frequency are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and in particular to a circuit and method for measuring multi-channel signals of the same frequency. Background Art

[0002] In the traditional multi-channel same-frequency signal measurement process, it is often necessary to switch the input signal channel manually or using a programmable circuit, and sequentially measure the frequency and power of each channel signal, which leads to a long measurement time and low measurement efficiency for multi-channel same-frequency signals. In addition, for the measurement of multi-channel same-frequency signals, a measurement circuit can also be used in each channel. However, this measurement method has the problem of high measurement cost. Summary of the invention

[0003] The present invention provides a measurement circuit and circuit for multi-channel same-frequency signals, so as to solve the problems of low measurement efficiency and high measurement cost of multi-channel same-frequency signals in the prior art.

[0004] To achieve the above-mentioned object and other related objects, the present invention provides a measurement circuit for multi-channel signals of the same frequency, comprising:

[0005] A power divider receives a reference signal and divides the reference signal into a first signal and a second signal;

[0006] a comb spectrum signal generator, receiving the first signal and generating a plurality of comb spectrum signals according to the first signal;

[0007] A plurality of branches, the input end of each branch is connected to one of the comb spectrum signals in one-to-one correspondence, and is also connected to one of the signals to be tested in one-to-one correspondence, each branch performs mixing processing on the comb spectrum signal and the signal to be tested to obtain a mixed signal, and performs filtering and amplification processing on the mixed signal to obtain and output a first target signal, wherein a plurality of devices to be tested output a plurality of the signals to be tested in one-to-one correspondence, and the standard frequencies of the plurality of the signals to be tested are the same;

[0008] A combiner, receiving all the first target signals, and combining and outputting each of the first target signals;

[0009] an analog-to-digital converter, receiving the first target signal and the second signal, and performing analog-to-digital conversion on the first target signal using the second signal as a reference signal to obtain a second target signal;

[0010] The processor receives the second target signal, processes and calculates the second target signal, obtains the frequency and power of the second target signal, and calculates the frequency and power of the signal to be measured based on the frequency and power of the second target signal.

[0011] Optionally, the branch includes a mixer, a filter and an amplifier, the RF input of the mixer is connected to the signal to be measured, the local oscillator input of the mixer is connected to the comb spectrum signal, the intermediate frequency output of the mixer is connected to the input of the filter, the mixer mixes the comb spectrum signal and the signal to be measured to obtain a mixed signal, the filter filters the mixed signal, the input of the amplifier is connected to the output of the filter, the output of the amplifier serves as the output of the branch, and the amplifier amplifies the mixed signal after filtering to obtain the first target signal.

[0012] Optionally, the filtering frequency range of the filter in each branch is different, and the filtering frequency range of the filter is related to the standard frequency of the signal to be measured and the frequency of the comb spectrum signal corresponding to the branch.

[0013] Optionally, the processor receives each of the second target signals, performs down-conversion processing and fast Fourier transform processing on each of the second target signals to obtain the frequency of each of the second target signals, and then combines the filtering frequency range of the filter in each of the branches to determine the mapping relationship between each of the second target signals and each of the signals to be tested.

[0014] Optionally, if the signal to be tested does not correspond to the second target signal, the mapping of the signal to be tested fails, indicating that the signal to be tested exceeds the allowable error range of the standard frequency.

[0015] Optionally, if the signal to be measured has a corresponding second target signal, the frequency of the signal to be measured is calculated according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal.

[0016] Optionally, if the signal to be tested has a corresponding second target signal, the power gain of the corresponding branch and the power of the corresponding second target signal are obtained, and the power of the signal to be tested is calculated based on the power of the second target signal and the power gain.

[0017] To achieve the above object and other related objects, the present invention also provides a method for measuring multi-channel signals of the same frequency, comprising:

[0018] receiving a reference signal, and performing power distribution on the reference signal to obtain a first signal and a second signal;

[0019] generating a plurality of comb spectrum signals according to the first signal;

[0020] Receiving a plurality of signals to be tested, performing one-to-one mixing processing on the comb spectrum signal and the signals to be tested to obtain a plurality of mixed signals, wherein a plurality of devices to be tested output a plurality of the signals to be tested in one-to-one correspondence, and the standard frequencies of the plurality of the signals to be tested are the same;

[0021] Filtering and amplifying each of the mixed signals respectively to obtain a plurality of first target signals;

[0022] Taking the second signal as a reference signal, performing analog-to-digital conversion processing on each of the first target signals respectively to obtain a second target signal;

[0023] The second target signal is processed and calculated to obtain the frequency and power of the second target signal, and the frequency and power of the signal to be measured are calculated based on the frequency and power of the second target signal.

[0024] Optionally, the filtering frequency ranges corresponding to the various mixing signals are different, and the filtering frequency ranges corresponding to the mixing signals are related to the standard frequency of the signal to be measured and the frequency of the comb spectrum signal corresponding to the mixing signals.

[0025] Optionally, the processing and calculating the second target signal to obtain the frequency and power of the second target signal includes:

[0026] Performing down-conversion processing and fast Fourier transform processing on each of the second target signals to obtain the frequency of each of the second target signals;

[0027] Calculating the frequency of the signal to be measured according to the frequency of the second target signal and the corresponding frequency of the comb spectrum signal;

[0028] Calculating a power gain according to the first target signal and the corresponding signal to be measured;

[0029] The power of the signal to be measured is calculated according to the second target signal and the corresponding power gain.

[0030] Beneficial effects of the present invention: The measurement circuit of the multi-channel same frequency signal in the present invention mixes the comb spectrum signal with the signal to be measured of each channel, filters and amplifies the mixed signal of each branch respectively, sends the amplified signal to the processor through the combiner, and measures the signal frequency and power of each channel. Compared with the traditional multi-channel same signal extraction and measurement circuit, the present invention has the advantages of high efficiency, high precision and low cost, and can be widely used in various multi-channel signal measurement systems; it solves the problems of low measurement efficiency and high measurement cost of multi-channel same frequency signals in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A schematic diagram showing a structure of a measurement circuit for multi-channel signals of the same frequency;

[0032] Figure 2 Displayed as a schematic diagram of the structure of each branch;

[0033] Figure 3 Another schematic diagram of the structure of the measurement circuit for multi-channel signals of the same frequency is shown. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] See also Figures 1 to 3 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner, so the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed arbitrarily, and the component layout type may also be more complicated. The structure, proportion, size, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, it has no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved.

[0036] In order to fully understand the present invention, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0037] The present invention provides a measurement circuit for multi-channel signals of the same frequency. Figure 1The measurement circuit of multi-channel same-frequency signals includes: a power divider, receiving a reference signal and dividing the reference signal into a first signal and a second signal; a comb spectrum signal generator, receiving the first signal and generating a plurality of comb spectrum signals according to the first signal; a plurality of branches, the input end of each branch is connected to a comb spectrum signal one-to-one, and is connected to a signal to be measured one-to-one, each branch performs mixing processing on the comb spectrum signal and the signal to be measured to obtain a mixed signal, and performs filtering and amplification processing on the mixed signal to obtain and output a first target signal, wherein a plurality of devices to be measured output a plurality of signals to be measured one-to-one, and the standard frequencies of the plurality of signals to be measured are the same; a combiner, receiving all the first target signals, and combining and outputting each of the first target signals; an analog-to-digital converter, receiving the first target signal and the second signal, using the second signal as a reference signal, performing analog-to-digital conversion on the first target signal, and obtaining a second target signal; a processor, receiving the second target signal, processing and calculating the second target signal, obtaining the frequency and power of the second target signal, and calculating the frequency and power of the signal to be measured based on the frequency and power of the second target signal.

[0038] See also Figure 2 The branch includes a mixer, a filter and an amplifier. The RF input end of the mixer receives the test signal, the local oscillator input end of the mixer receives the comb spectrum signal, the intermediate frequency output end of the mixer is connected to the input end of the filter, the mixer mixes the comb spectrum signal and the test signal to obtain a mixed signal, the filter filters the mixed signal, the input end of the amplifier is connected to the output end of the filter, the output end of the amplifier serves as the output end of the branch, and the amplifier amplifies the filtered mixed signal to obtain a first target signal.

[0039] In one embodiment, the filtering frequency ranges of the filters of each branch are different, and the filtering frequency ranges of the filters are related to the standard frequency of the signal to be tested and the frequency of the comb spectrum signal corresponding to the branch. Specifically, if the signal to be tested and the comb spectrum signal are added during the mixing process, the filtering frequency range of the filter is the sum of the allowable error range of the standard frequency of the signal to be tested and the frequency of the comb spectrum signal; correspondingly, if the signal to be tested and the comb spectrum signal are subtracted during the mixing process, the filtering frequency range of the filter is the difference between the allowable error range of the standard frequency of the signal to be tested and the frequency of the comb spectrum signal.

[0040] In one embodiment, the processor receives each second target signal, performs down-conversion processing and fast Fourier transform processing on each second target signal, obtains the frequency of each second target signal, and then determines the mapping relationship between each second target signal and each signal to be tested in combination with the filtering frequency range of the filter in each branch. If there is no corresponding second target signal for the signal to be tested, the mapping of the signal to be tested fails, indicating that the signal to be tested exceeds the allowable error range of the standard frequency. If there is a corresponding second target signal for the signal to be tested, the frequency of the signal to be tested is calculated according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal. If there is a corresponding second target signal for the signal to be tested, the frequency of the signal to be tested is calculated according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal. If there is a corresponding second target signal for the signal to be tested, the power gain of the corresponding branch and the power of the corresponding second target signal are obtained, and the power of the signal to be tested is calculated according to the power of the second target signal and the power gain. After obtaining the rated power of the signal to be tested, the power of the signal to be tested can be compared with the standard power of the signal to be tested to determine whether the power of the signal to be tested exceeds the allowable error range of the standard power.

[0041] In one embodiment, the processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), a complex programmable logic device (CPLD) that is more complex than a PLD, etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0042] See also Figure 3In a specific embodiment, the reference source u16 provides a reference signal; the power divider u15 (power divider) receives the reference signal and divides the reference signal into a first signal and a second signal; the comb spectrum signal generator u1 receives the first signal and generates a plurality of comb spectrum signals according to the first signal; the local oscillator input ends of the mixers (u1, u2, u3, u4, u5) receive a comb spectrum signal one by one, and the RF input ends of the mixers receive a signal to be measured (input signal f1, input signal f2, input signal f3, input signal f5) one by one, and the mixer mixes the comb spectrum signal and the signal to be measured to obtain a mixed signal; the filters (u6, u7, u8, u9) receive a mixed signal one by one, and filter the mixed signal The amplifiers (u10, u11, u12, u13) receive a mixed signal after filtering one by one, and amplify the mixed signal after filtering to obtain a plurality of first target signals; the combiner (u14) receives all the first target signals, and combines and outputs the first target signals; the analog-to-digital converter (u17) receives the combined output first target signal and the second signal, and uses the second signal as the reference signal to perform analog-to-digital conversion on the first target signal to obtain a plurality of second target signals; the processor (CPLD, u18) receives the second target signal, processes and calculates the second target signal, obtains the frequency and power of the second target signal, and calculates the frequency and power of the signal to be measured based on the frequency and power of the second target signal. Finally, the calculated frequency and power of the input signal of each channel are uploaded to the computer software for display. Among them, each signal component of the comb spectrum signal uses the reference source of the analog-to-digital converter of the measurement circuit, thereby ensuring the consistency of the frequency accuracy of each channel and the measurement circuit.

[0043] Based on the same inventive concept as the above-mentioned multi-channel same-frequency signal measurement circuit, accordingly, this embodiment also provides a multi-channel same-frequency signal measurement method. In this embodiment, the method is implemented on the multi-channel same-frequency signal measurement circuit described in any of the above-mentioned embodiments, and the specific functions and technical effects can be referred to the above-mentioned embodiments, which will not be repeated here.

[0044] In one embodiment, a method for measuring multi-channel signals of the same frequency includes: receiving a reference signal, and performing power distribution on the reference signal to obtain a first signal and a second signal; generating a plurality of comb spectrum signals according to the first signal; receiving a plurality of signals to be tested, and performing one-to-one mixing processing on the comb spectrum signals and the signals to be tested to obtain a plurality of mixed signals, wherein a plurality of devices to be tested output a plurality of signals to be tested in a one-to-one correspondence, and the standard frequencies of the plurality of signals to be tested are the same; filtering and amplifying each mixed signal to obtain a plurality of first target signals; taking the second signal as a reference signal, performing analog-to-digital conversion processing on each first target signal to obtain a second target signal; processing and calculating the second target signal to obtain the frequency and power of the second target signal, and calculating the frequency and power of the signal to be tested based on the frequency and power of the second target signal.

[0045] In one embodiment, when filtering the mixed signals, the filtering frequency ranges corresponding to the mixed signals are different, and the filtering frequency ranges corresponding to the mixed signals are related to the standard frequency of the signal to be measured and the frequency of the comb spectrum signal corresponding to the mixed signals.

[0046] In one embodiment, the second target signal is processed and calculated to obtain the frequency and power of the second target signal, including: performing down-conversion processing and fast Fourier transform processing on each second target signal to obtain the frequency of each second target signal; calculating the frequency of the signal to be tested according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal; calculating the power gain according to the first target signal and the corresponding signal to be tested; and calculating the power of the signal to be tested according to the second target signal and the corresponding power gain. When the second target signal is processed and calculated to obtain the frequency and power of the second target signal, it is also necessary to determine whether the signal to be tested has a corresponding second target signal. Specifically, each second target signal is down-converted and fast Fourier transformed to obtain the frequency of each second target signal, and then combined with the filter frequency range corresponding to each mixing signal, the mapping relationship between each second target signal and each signal to be tested is determined. If there is no corresponding second target signal for the signal to be tested, the mapping of the signal to be tested fails, indicating that the signal to be tested exceeds the allowable error range of the standard frequency. If there is a corresponding second target signal for the signal to be tested, the frequency of the signal to be tested is calculated according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal. If the signal to be tested has a corresponding second target signal, the power gain of the corresponding branch and the power of the corresponding second target signal are obtained, and the power of the signal to be tested is calculated according to the power and power gain of the second target signal.

[0047] In summary, the measurement circuit of the multi-channel same frequency signal of the present invention mixes the comb spectrum signal with the signal to be measured of each channel, filters and amplifies the mixed signal of each branch respectively, sends the amplified signal to the processor through the combiner, and measures the signal frequency and power of each channel. Compared with the traditional multi-channel same signal extraction and measurement circuit, the present invention has the advantages of high efficiency, high precision and low cost, and can be widely used in various multi-channel signal measurement systems; it solves the problems of low measurement efficiency and high measurement cost of multi-channel same frequency signals in the prior art.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A measurement circuit for multi-channel signals of the same frequency, characterized in that: include: A power divider receives a reference signal and divides the reference signal into a first signal and a second signal; a comb spectrum signal generator, receiving the first signal and generating a plurality of comb spectrum signals according to the first signal; A plurality of branches, the input end of each branch is connected to one of the comb spectrum signals in one-to-one correspondence, and is also connected to one of the signals to be tested in one-to-one correspondence, each branch performs mixing processing on the comb spectrum signal and the signal to be tested to obtain a mixed signal, and performs filtering and amplification processing on the mixed signal to obtain and output a first target signal, wherein a plurality of devices to be tested output a plurality of the signals to be tested in one-to-one correspondence, and the standard frequencies of the plurality of the signals to be tested are the same; A combiner, receiving all the first target signals, and combining and outputting each of the first target signals; an analog-to-digital converter, receiving the first target signal and the second signal, and performing analog-to-digital conversion on the first target signal using the second signal as a reference signal to obtain a second target signal; The processor receives the second target signal, processes and calculates the second target signal, obtains the frequency and power of the second target signal, and calculates the frequency and power of the signal to be measured based on the frequency and power of the second target signal.

2. The measuring circuit of multi-channel same frequency signals according to claim 1, characterized in that: The branch includes a mixer, a filter and an amplifier. The RF input end of the mixer is connected to the signal to be measured, the local oscillator input end of the mixer is connected to the comb spectrum signal, the intermediate frequency output end of the mixer is connected to the input end of the filter, the mixer mixes the comb spectrum signal and the signal to be measured to obtain a mixed signal, the filter filters the mixed signal, the input end of the amplifier is connected to the output end of the filter, the output end of the amplifier serves as the output end of the branch, and the amplifier amplifies the mixed signal after filtering to obtain the first target signal.

3. The measuring circuit of multi-channel same frequency signals according to claim 2, characterized in that: The filtering frequency range of the filter in each branch is different, and the filtering frequency range of the filter is related to the standard frequency of the signal to be measured and the frequency of the comb spectrum signal corresponding to the branch.

4. The measuring circuit for multi-channel signals of the same frequency according to claim 3, characterized in that: The processor receives each of the second target signals, performs down-conversion processing and fast Fourier transform processing on each of the second target signals to obtain the frequency of each of the second target signals, and then combines the filtering frequency range of the filter in each of the branches to determine the mapping relationship between each of the second target signals and each of the signals to be tested.

5. The measuring circuit of multi-channel same frequency signals according to claim 4, characterized in that: If the signal to be tested does not have a corresponding second target signal, the mapping of the signal to be tested fails, indicating that the signal to be tested exceeds the allowable error range of the standard frequency.

6. The measuring circuit for multi-channel signals of the same frequency according to claim 4, characterized in that: If the signal to be measured has a corresponding second target signal, the frequency of the signal to be measured is calculated according to the frequency of the second target signal and the frequency of the corresponding comb spectrum signal.

7. The measuring circuit for multi-channel signals of the same frequency according to claim 4, characterized in that: If the signal to be tested has a corresponding second target signal, the power gain of the corresponding branch and the power of the corresponding second target signal are obtained, and the power of the signal to be tested is calculated according to the power of the second target signal and the power gain.

8. A method for measuring multi-channel signals of the same frequency, characterized in that: include: receiving a reference signal, and performing power distribution on the reference signal to obtain a first signal and a second signal; generating a plurality of comb spectrum signals according to the first signal; Receiving a plurality of signals to be tested, performing one-to-one mixing processing on the comb spectrum signal and the signals to be tested to obtain a plurality of mixed signals, wherein a plurality of devices to be tested output a plurality of the signals to be tested in one-to-one correspondence, and the standard frequencies of the plurality of the signals to be tested are the same; Filtering and amplifying each of the mixed signals respectively to obtain a plurality of first target signals; Taking the second signal as a reference signal, performing analog-to-digital conversion processing on each of the first target signals respectively to obtain a second target signal; The second target signal is processed and calculated to obtain the frequency and power of the second target signal, and the frequency and power of the signal to be measured are calculated based on the frequency and power of the second target signal.

9. The method for measuring multi-channel signals of the same frequency according to claim 8, characterized in that: The filtering frequency ranges corresponding to the various mixing signals are different, and the filtering frequency ranges corresponding to the mixing signals are related to the standard frequency of the signal to be measured and the frequency of the comb spectrum signal corresponding to the mixing signals.

10. The method for measuring multi-channel signals of the same frequency according to claim 9, characterized in that: The processing and calculating the second target signal to obtain the frequency and power of the second target signal includes: Performing down-conversion processing and fast Fourier transform processing on each of the second target signals to obtain the frequency of each of the second target signals; Calculating the frequency of the signal to be measured according to the frequency of the second target signal and the corresponding frequency of the comb spectrum signal; Calculating a power gain according to the first target signal and the corresponding signal to be measured; The power of the signal to be measured is calculated according to the second target signal and the corresponding power gain.

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