CN114859116B - Broadband frequency measurement device based on amplitude-frequency attenuation characteristic - Google Patents
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Abstract
The invention discloses a broadband frequency measurement device based on amplitude-frequency attenuation characteristics, which comprises a signal amplifier, a power divider, an equalizer, a first amplitude detector, a second amplitude detector and a voltage detection processing circuit, wherein the signal amplifier is connected with the power divider; the signal amplifier sends the amplified measured signal to the power distributor; the first output end of the power divider is connected with the first amplitude detector to form a first detection branch, and the second output end of the power divider is connected with the second amplitude detector through the equalizer to form a second detection branch; the voltage detection processing circuit obtains the frequency value of the detected signal according to the signal amplitude level value respectively input by the second detection branch of the first detection branch. According to the invention, through the equalizer with the amplitude-frequency attenuation characteristic of the negative linear slope, the frequency calculation measurement is carried out according to the output electric frequency of the first detection branch and the second detection branch by utilizing the amplitude-frequency mapping relation, the circuit architecture is greatly simplified, and the equalizer has the advantages of miniaturization, low cost, high reliability, good universality and the like.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a broadband frequency measurement device based on amplitude-frequency attenuation characteristics.
Background
In radio frequency microwave systems, a perceived measurement of frequency is one of its key functional requirements. In the fields of communications, radar and electronics, almost all electronic devices require fast and accurate frequency measurements of external signals. The frequency measuring circuit is very common and is used for extracting signal frequency parameters, so that the signal type, the signal source, the signal application and the like can be conveniently distinguished.
The common frequency measurement method mainly comprises the following steps: the super heterodyne receiving frequency measurement, the tuning crystal video receiving frequency measurement, the channelized receiving frequency measurement, the near modern digital circuit development, the Instantaneous Frequency Measurement (IFM) of a phase comparison method, the Fast Fourier (FFT) digital frequency measurement and the like are adopted. The superheterodyne receiving frequency measurement is to use the direct current or low frequency signal generated when the frequency of the output signal of the tuning frequency source is consistent with the frequency of the signal to be measured to judge the frequency of the signal to be measured. The method needs to search the frequency source continuously, and has poor real-time performance. The frequency measurement of the tuned crystal video receiving and the channelized receiving adopts a resonance principle, and when the circuit resonance frequency is the same as the frequency of an external signal, resonance is generated, so that the purpose of measuring the frequency is achieved. The method has the defects of poor real-time performance and low frequency measurement precision. Modern classical Instantaneous Frequency Measurement (IFM) derives the frequency of a measured signal by measuring the phase change of the signal. The Fourier method is a digital method adopting high-speed acquisition and quantization, and the signal frequency is calculated by a digital processing method of multiplying the measured signal by an orthogonal factor in a digital domain. The digital method has the characteristics of high speed and accurate measurement, but needs a digital signal processing device, and has complex circuit and high cost. Therefore, how to provide a frequency measurement circuit with simple circuit, low cost and miniaturization is a technical problem to be solved.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a broadband frequency measurement device based on amplitude-frequency attenuation characteristics, and aims to solve the technical problems of poor instantaneity, low precision and high cost of the conventional frequency measurement method.
In order to achieve the above object, the present invention provides a broadband frequency measurement device based on amplitude-frequency attenuation characteristics, the device including a signal amplifier, a power divider, an equalizer, a first amplitude detector, a second amplitude detector, and a voltage detection processing circuit; wherein:
the input end of the signal amplifier receives the detected signal, and the output end of the signal amplifier is connected with the input end of the power distributor;
the first output end of the power divider is connected with a first amplitude detector to form a first detection branch, and the second output end of the power divider is connected with a second amplitude detector through an equalizer to form a second detection branch;
the first input end of the voltage detection processing circuit is connected with the output end of the first amplitude detector, the second input end of the voltage detection processing circuit is connected with the output end of the second amplitude detector, and the voltage detection processing circuit obtains the frequency value of the detected signal according to the amplitude level value of the signal respectively input by the second detection branch of the first detection branch.
Optionally, the equalizer attenuates the input signal in a negative linearity over the frequency range under test.
Optionally, the power divider adopts a microblog broadband power divider with two paths of equal power division.
Optionally, the first amplitude detector and the second amplitude detector output signals of the first detection branch and the second detection branch after rectification and capacitance filtering through diodes respectively.
Optionally, the voltage detection processing circuit includes an AD sampling quantization module and a frequency measurement module.
Optionally, the AD sampling quantization module is configured to perform analog-to-digital conversion on signals output by the first detection branch and the second detection branch respectively, so as to obtain a signal amplitude level value.
Optionally, the frequency measurement module is configured to obtain a frequency value of a measured signal according to a signal amplitude level value respectively input by a second detection branch of the first detection branch, where an expression for obtaining the frequency value of the measured signal is:
f x ＝f L +(f H -f L )(10log10(A/B)-α)/(β-α)；
wherein f x For the frequency of the detected signal, A is the signal amplitude electric frequency value of the first detection branch, B is the signal amplitude electric frequency value of the second detection branch, f L Lower limit of operating frequency range designed for equalizer, f H Operating frequency designed for equalizerThe upper end of the rate range, alpha and beta, are the equalizer at frequency f, respectively L And f H Is used for the attenuation values of (a).
The invention has the following beneficial effects:
in principle, the invention provides an equalizer with amplitude-frequency attenuation characteristic of negative linear slope in a circuit for the first time, and a method for carrying out frequency calculation measurement through amplitude-frequency mapping relation. The method has the advantages of simple working principle, greatly simplified circuit architecture, convenient realization by adopting the design of miniaturized, low-cost and general mature devices, miniaturization, low cost, high reliability, good universality and the like.
The invention has the characteristics of high frequency and ultra-wideband, and the equalizer can be realized by advanced semiconductor process design, so that the amplitude-frequency characteristic of high linearity can be realized in the ultra-wideband range, and the measuring frequency can cover a plurality of frequency bands such as radio frequency, microwave, millimeter wave and the like.
The invention has the characteristics of high precision and large dynamic, and as the equalizer has the amplitude-frequency characteristic of high linearity, and the low-frequency amplitude voltage is formed after the amplitude detection, the sampling frequency requirement of the analog-to-digital converter AD is sharply reduced, thereby greatly improving the quantization precision and the quantization amplitude range.
Drawings
FIG. 1 is a schematic diagram of the broadband frequency measurement device based on amplitude-frequency attenuation characteristics;
FIG. 2 is a frequency-amplitude characteristic of the equalizer of the present invention;
FIG. 3 is a schematic diagram of an equalizer chip design model according to the present invention;
FIG. 4 is a schematic diagram of simulation results of an amplitude-frequency characteristic of the equalizer of the present invention;
FIG. 5 is a schematic diagram of a simulation model of a broadband frequency measurement device based on amplitude-frequency attenuation characteristics;
fig. 6 is a schematic diagram of simulation results of a broadband frequency measurement device based on amplitude-frequency attenuation characteristics.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In radio frequency microwave systems, a perceived measurement of frequency is one of its key functional requirements. In the fields of communications, radar and electronics, almost all electronic devices require fast and accurate frequency measurements of external signals. The frequency measuring circuit is very common and is used for extracting signal frequency parameters, so that the signal type, the signal source, the signal application and the like can be conveniently distinguished.
The common frequency measurement method mainly comprises the following steps: the super heterodyne receiving frequency measurement, the tuning crystal video receiving frequency measurement, the channelized receiving frequency measurement, the near modern digital circuit development, the Instantaneous Frequency Measurement (IFM) of a phase comparison method, the Fast Fourier (FFT) digital frequency measurement and the like are adopted. The superheterodyne receiving frequency measurement is to use the direct current or low frequency signal generated when the frequency of the output signal of the tuning frequency source is consistent with the frequency of the signal to be measured to judge the frequency of the signal to be measured. The method needs to search the frequency source continuously, and has poor real-time performance. The frequency measurement of the tuned crystal video receiving and the channelized receiving adopts a resonance principle, and when the circuit resonance frequency is the same as the frequency of an external signal, resonance is generated, so that the purpose of measuring the frequency is achieved. The method has the defects of poor real-time performance and low frequency measurement precision. Modern classical Instantaneous Frequency Measurement (IFM) derives the frequency of a measured signal by measuring the phase change of the signal. The Fourier method is a digital method adopting high-speed acquisition and quantization, and the signal frequency is calculated by a digital processing method of multiplying the measured signal by an orthogonal factor in a digital domain. The digital method has the characteristics of high speed and accurate measurement, but needs a digital signal processing device, and has complex circuit and high cost. Therefore, how to provide a frequency measurement circuit with simple circuit, low cost and miniaturization is a technical problem to be solved.
To solve this problem, various embodiments of the broadband frequency measuring device based on the amplitude-frequency attenuation characteristic of the present invention are proposed. The broadband frequency measurement device based on amplitude-frequency attenuation characteristics provided by the invention performs frequency calculation measurement according to the output electric frequency of the first detection branch and the second detection branch by using the equalizer of the amplitude-frequency attenuation characteristics with negative linear slope and utilizing the amplitude-frequency mapping relation, so that the circuit architecture is greatly simplified, and the broadband frequency measurement device based on the amplitude-frequency attenuation characteristics has the advantages of miniaturization, low cost, high reliability, good universality and the like.
The embodiment of the invention provides a broadband frequency measurement device based on amplitude-frequency attenuation characteristics, and referring to fig. 1, fig. 1 is a schematic diagram of the composition of an embodiment of the broadband frequency measurement device based on amplitude-frequency attenuation characteristics.
In this embodiment, the wideband frequency measurement device based on the amplitude-frequency attenuation characteristic includes a signal amplifier, a power divider, an equalizer, a first amplitude detector, a second amplitude detector, and a voltage detection processing circuit.
Specifically, the input end of the signal amplifier receives a detected signal, and the output end of the signal amplifier is connected with the input end of the power divider; the first output end of the power divider is connected with the first amplitude detector to form a first detection branch, and the second output end of the power divider is connected with the second amplitude detector through the equalizer to form a second detection branch; the first input end of the voltage detection processing circuit is connected with the output end of the first amplitude detector, the second input end of the voltage detection processing circuit is connected with the output end of the second amplitude detector, and the voltage detection processing circuit obtains the frequency value of the detected signal according to the amplitude level value of the signal respectively input by the second detection branch of the first detection branch.
In this embodiment, when a radio frequency microwave signal passes through a special device or material in a transmission path, the signal amplitude linearly changes with the frequency to form a frequency-amplitude mapping relationship, and after the signal amplitude is accurately measured, the accurate frequency is calculated according to the amplitude-frequency mapping relationship. The main characteristics of the circuit of the specific invention are shown in figure 1, and the circuit comprises: a signal amplifier 1, a power divider 2, an equalizer 3, an amplitude detector 4 (-1, -2), and a voltage detection circuit 5.
The received signal is amplified by the signal amplifier 1, and then is divided into two paths of signals by the constant-amplitude power divider 2, and the two paths of signals enter the branch 1 and the branch 2 respectively. The branch 1 is a reference branch, and the branch 2 is a negative linear slope attenuation branch with frequency. The signal of branch 1 directly enters the amplitude detector4-1, outputting the amplitude level of the signal, and then carrying out voltage amplitude acquisition quantization and processing by a voltage detection processing circuit 5 to calculate the amplitude value A of the signal. The signal of the branch circuit 2 is attenuated by the equalizer 3 according to the frequency of the signal, then enters the amplitude detector 4-2 to output the signal amplitude level attenuated by the frequency point, and then the amplitude value B of the signal is calculated by amplitude acquisition, quantization and processing by the voltage detection processing circuit 5. The frequency attenuation characteristic of the negative linear slope of the equalizer can be precisely designed and manufactured, as shown in fig. 2, as a frequency-amplitude characteristic of the equalizer 3. Wherein f L And f H The lower and upper limits of the operating frequency range designed for the equalizer, alpha and beta being the equalizer at frequency f, respectively L And f H Is used for the attenuation values of (a). θ is the measured signal frequency f x Attenuation values through the equalizer.
The signal amplifier 1 is designed and manufactured by a semiconductor chip technology, and realizes miniaturization, high frequency and broadband characteristics, and indexes such as noise coefficient and gain are determined according to the system design requirement.
The power divider 2 is designed and manufactured by using a microwave passive circuit technology, and a micro-microblog broadband power divider for realizing micro-two-way equal-power distribution is realized.
In this embodiment, the equalizer 3 is a key element of the present invention, and mainly implements a negative linear attenuation amount required in the measured frequency range. With the development and progress of semiconductor process technology, an equalizer with negative linear attenuation can be easily realized within 20GHz by adopting chip design and processing manufacturing technology, and the equalizer has the advantages of small volume size, high linearity and stable performance. The specific frequency-attenuation corresponding relation is determined according to the design requirement of the system.
The first amplitude detector and the second amplitude detector output signals of the first detection branch and the second detection branch after rectification and capacitance filtering through diodes respectively.
In this embodiment, the first amplitude detector, namely, the amplitude detector 4-1, and the second amplitude detector, namely, the amplitude detector 4-2, are implemented by using a mature wideband logarithmic detector, and the high-frequency signal is rectified by a diode and filtered by a capacitor, and then a direct current signal with a corresponding amplitude is output.
The voltage detection processing circuit 5 includes an AD sampling quantization module and a frequency measurement module. The voltage detection processing circuit 5 is used for carrying out large dynamic acquisition and high-precision quantization on the detected amplitude signal and converting the amplitude signal into a digital signal which is convenient for calculation processing. After the radio frequency microwave signal is converted into low frequency or direct current voltage by the amplitude detection circuit, the speed requirement of the analog-to-digital converter is sharply reduced, so that the accuracy and the dynamic range of amplitude measurement can be greatly improved. The quantized amplitude information may be used alone or in combination: devices such as a memory (SDRAM), a singlechip (MCU) or a programmable logic array (FPGA) are adopted to obtain the frequency value of the detected signal in a table look-up or calculation processing mode.
Specifically, the AD sampling quantization module is configured to perform analog-to-digital conversion on signals output by the first detection branch and the second detection branch, so as to obtain signal amplitude level values.
Specifically, the frequency measurement module is configured to obtain a frequency value of a measured signal according to the signal amplitude level values respectively input by the second detection branch of the first detection branch, and the measured signal frequency fx may be deduced by the following calculation method:
the method comprises the following steps: (10 log10 (A/B) -alpha)/(f) x -f L )＝(β-α)/(f H -f L )；
f x ＝f L +(f H -f L )(10log10(A/B)-α)/(β-α)；
In rf microwave circuits, the power or amplitude of the signal is typically expressed in dB values for ease of calculation and measurement, and therefore, the measured voltage value A, B needs to be logarithmic (dB representation). Similarly, α, β is the attenuation value (dB representation) corresponding to the equalizer at the low and high ends of the operating frequency. Thus f x For the frequency of the detected signal, A is the signal amplitude electric frequency value of the first detection branch, B is the signal amplitude electric frequency value of the second detection branch, f L Lower limit of operating frequency range designed for equalizer, f H The upper limit of the operating frequency range designed for the equalizer, alpha and beta being the equalizer at frequency f, respectively L And f H Is used for the attenuation values of (a).
In order to facilitate understanding, the present embodiment proposes a specific example of a broadband frequency measurement device based on an amplitude-frequency attenuation characteristic, which is specifically as follows:
in this embodiment, the main index requirements of the frequency measurement system are set as follows:
measured signal frequency range: 2-6 GHz;
bandwidth: bw=4 GHz;
measured signal power range: -60 to-30 dBm (1 dbm=10 log (Pin/1 mW));
the frequency measurement accuracy requirement of the frequency measurement system is as follows: Δf=10 MHz;
(1) First, the parameter index of the equalizer 3 is determined. As shown in fig. 1, a key equalizer 3 is introduced, wherein the equalizer is a common device of a radio frequency microwave circuit, and the main characteristic parameter of the equalizer is amplitude-attenuation slope. According to the case index requirement of the embodiment, the working frequency of the equalizer is 2-6GHz, and BW/. DELTA.f=400 is considered, so as to facilitate calculation and measurement, and the equalizer is converted into a logarithmic (dB) value: 10log (BW/Δf) =26 dB, if the system detection sensitivity is set to 0.1dB, the equalizer is designed to have an equalization amount of 36dB (i.e., 10×log (4000) =36 dB). As shown in fig. 2, the equalizer is designed to have an attenuation value of α at frequency fL, a attenuation value of β at frequency fH, and |α - β|ζ ζ -36 dB, and the frequencies have a one-to-one linear relationship with the attenuation values. Fig. 3 is a schematic diagram of an equalizer chip design model according to the present embodiment, and fig. 4 is a schematic diagram of simulation results of an amplitude-frequency characteristic curve of an equalizer. The attenuation at 2GHz is 38dB, the attenuation at 6GHz is 2dB, and the amplitude-frequency characteristic in the whole frequency range shows an approximate negative linear slope relation. Because of the errors introduced by the parameters of the components and the manufacturing process within the equalizer, the resulting curve is not ideally linear and errors can be corrected by systematic testing and calibration.
(2) Then, the parameter index of the amplifier 1 and the voltage detection circuit 4 (-1, -2) is determined. As shown in fig. 1, the signal amplifier 1 is mainly used for amplifying the power of a detected signal, improving the noise performance of a system, and the main performance parameters are as follows: the gain value (G) and the Noise Figure (NF) are determined according to the measured signal power range and the subsequent detection circuit performance. In the case, the gain of the amplifier is set to 39dB, the noise coefficient is less than or equal to 3dB, and the working frequency range is 2-6 GHz. Because the power distributor 2 at the rear end is a constant-amplitude power distribution, the gain flatness of the amplifier has no influence on the system operation, the design requirement of the amplifier is greatly reduced, and the power distributor can be realized by using a mature miniaturized low-noise amplifier.
(3) The amplitude detector 4 (-1, -2) is mainly used for rectifying and filtering signals of two branches, converting radio frequency signals into low frequency or direct current voltage, and facilitating digital quantization and processing of subsequent circuits. The main performance parameters are detection sensitivity and operating frequency range. In the embodiment, the detection sensitivity is set to be-60 dBm, the power range is-60 dBm-10 dBm, the working frequency range is 2-6GHz, and the detection can be realized by adopting a mature miniaturized radio frequency detector.
(4) To check whether each device meets the system application requirements, consider the worst two cases, 1) when the received signal parameters are: the power is-60 dBm, the frequency is 2GHz, after amplified power division, the signal power is-24 dBm, after the signal of the branch 2 passes through the equalizer 3, the power attenuation is-60 dBm, and the signal power of the branch 1 is-24 dBm. 2) When the received signal parameters are: the power is-30 dBm, the frequency is 6GHz, the signal power is 6dBm after amplifying power division, the power of the signal of the branch 2 is 6dBm after the signal of the branch 1 passes through the equalizer 3, and the signal power of the branch 1 is 6dBm. The power of both conditions is in the detection power range of the detector, and the application requirements of the system are met.
(5) As shown in fig. 1, the voltage detection processing circuit 5 mainly performs acquisition, quantization and calculation processing on the low-frequency or direct-current voltage after the wave detector to obtain a frequency result. The main performance parameters are the number of quantization (bit) bits (i.e. quantization accuracy), the power range of the input signal, and the operation speed, accuracy, etc. In order to improve the measurement accuracy, in the case, the analog-to-digital conversion can be realized by adopting a device with the quantization bit number more than or equal to 14bit and the sampling rate more than or equal to 100 MSPS. The dynamic range of 14bit is more than or equal to 86dB, and the signal power range and the frequency measurement precision of the scheme are met. The higher the bit, the higher the measurement accuracy. A computing processing unit, which may be used alone or in combination: memory (SDRAM), single chip Microcomputer (MCU) or programmable logic array (FPGA) devices, etc., adopting table look-up or using formula f x ＝f L +(f H -f L ) (10 log10 (A/B) -alpha)/(beta-alpha), and calculating to obtain the frequency value of the detected signal.
(6) According to the composition and design parameters of the embodiment, the simulation is performed by adopting system simulation software, the simulation model is shown in fig. 5, and the simulation test result is shown in fig. 6. It can be seen that the simulation test result curve in the 2-6GHz band is consistent with the amplitude-frequency attenuation curve designed by the equalizer 3, so that accurate frequency information can be obtained according to the test result.
(7) In practical application circuits, other devices except the equalizer have non-ideal characteristics, such as: unequal power division of the power divider, differences between the two detectors, and the like can introduce errors to affect the frequency measurement accuracy. But various errors can be eliminated through system pre-calibration, so that the required test precision is achieved.
In this embodiment, a broadband frequency measurement device based on amplitude-frequency attenuation characteristics is provided, and the device includes a signal amplifier, a power divider, an equalizer, a first amplitude detector, a second amplitude detector, and a voltage detection processing circuit; the signal amplifier sends the amplified measured signal to the power distributor; the first output end of the power divider is connected with the first amplitude detector to form a first detection branch, and the second output end of the power divider is connected with the second amplitude detector through the equalizer to form a second detection branch; the voltage detection processing circuit obtains the frequency value of the detected signal according to the signal amplitude level value respectively input by the second detection branch of the first detection branch. According to the invention, through the equalizer with the amplitude-frequency attenuation characteristic of the negative linear slope, the frequency calculation measurement is carried out according to the output electric frequency of the first detection branch and the second detection branch by utilizing the amplitude-frequency mapping relation, the circuit architecture is greatly simplified, and the equalizer has the advantages of miniaturization, low cost, high reliability, good universality and the like.
It should be further noted that the above-described apparatus embodiments are merely illustrative, and that the units described as separate units may or may not be physically separate, and that units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present invention may be implemented by means of software plus necessary general purpose hardware, or of course by means of special purpose hardware including application specific integrated circuits, special purpose CPUs, special purpose memories, special purpose components, etc. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions can be varied, such as analog circuits, digital circuits, or dedicated circuits. However, a software program implementation is a preferred embodiment for many more of the cases of the present invention. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a Read-only memory (ROM), a random-access memory (RAM, randomAccessMemory), a magnetic disk or an optical disk of a computer, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
Claims (5)
1. The broadband frequency measurement device based on the amplitude-frequency attenuation characteristic is characterized by comprising a signal amplifier, a power divider, an equalizer, a first amplitude detector, a second amplitude detector and a voltage detection processing circuit; wherein:
the input end of the signal amplifier receives the detected signal, and the output end of the signal amplifier is connected with the input end of the power distributor;
the first output end of the power divider is connected with a first amplitude detector to form a first detection branch, and the second output end of the power divider is connected with a second amplitude detector through an equalizer to form a second detection branch;
the first input end of the voltage detection processing circuit is connected with the output end of the first amplitude detector, the second input end of the voltage detection processing circuit is connected with the output end of the second amplitude detector, and the voltage detection processing circuit obtains the frequency value of the detected signal according to the amplitude level values of the signals respectively input by the first detection branch and the second detection branch; wherein:
the voltage detection processing circuit comprises an AD sampling quantization module and a frequency measurement module;
the frequency measuring module is used for obtaining the frequency value of the measured signal according to the signal amplitude level values respectively input by the first detection branch and the second detection branch, and the expression for obtaining the frequency value of the measured signal is as follows:
f x ＝f L +(f H -f L )(10log10(A/B)-α)/(β-α)；
wherein f x For the frequency of the detected signal, A is the signal amplitude level value of the first detection branch, B is the signal amplitude level value of the second detection branch, f L Lower limit of operating frequency range designed for equalizer, f H The upper limit of the operating frequency range designed for the equalizer, alpha and beta being the equalizer at frequency f, respectively L And f H Is used for the attenuation values of (a).
2. The broadband frequency measurement device based on amplitude-frequency attenuation characteristics according to claim 1, wherein said equalizer performs negative linear attenuation of the input signal in the measured frequency range.
3. The broadband frequency measurement device based on amplitude-frequency attenuation characteristics according to claim 1, wherein the power divider adopts a two-way equal-power-divided microblog broadband power divider.
4. The broadband frequency measuring device based on amplitude-frequency attenuation characteristics according to claim 1, wherein the first amplitude detector and the second amplitude detector output signals of the first detection branch and the second detection branch after rectification and capacitive filtering by diodes, respectively.
5. The broadband frequency measuring device based on amplitude-frequency attenuation characteristics according to claim 1, wherein the AD sampling quantization module is configured to perform analog-to-digital conversion on signals output by the first detection branch and the second detection branch, respectively, to obtain signal amplitude level values.
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