A channel frequency conversion device and method for 5G communication signal testing

Abstract

The present invention discloses a channel frequency conversion device and method for testing 5G communication signals, the device comprising a 400MHz to 6GHz frequency conversion circuit below 6GHz and a 6GHz to 43.5GHz, 43.5GHz to 76GHz frequency conversion circuit above 6GHz. The local oscillator frequency generated by the first local oscillator is provided to the first mixer of the three channels through a switch, etc., and mixed with the 5G signal to be tested to obtain a first intermediate frequency signal of 2.55424GHz for the first channel and 4.37504GHz for the second and third channels. The first intermediate frequency is mixed with the point frequency local oscillator to obtain a second intermediate frequency signal of 245.76MHz and 3.62496GHz, realizing 5G signal testing with a 200MHz analysis bandwidth in the 400MHz to 6GHz, 6GHz to 43.5GHz frequency bands and a 1GHz analysis bandwidth in the 6GHz to 43.5GHz, 43.5GHz to 76GHz frequency bands.

Description

Technical Field

[0001] The present invention relates to the field of 5G communication signal testing and broadband frequency conversion technology, and in particular to a channel frequency conversion device and method for 5G communication signal testing. Background Art

[0002] With the rapid development of mobile communication technology, 5G has been commercialized on a large scale. 5G communication uses microwave millimeter wave and large bandwidth technologies. The test and verification of 5G key core devices, components, base stations, terminals, etc. designed using these technologies require test instruments with millimeter wave and large bandwidth 5G communication signal analysis capabilities. The core module in the test instrument is the frequency conversion channel module that converts millimeter wave and large bandwidth 5G signals into intermediate frequency signals, which plays a decisive role in realizing 5G signal testing. Summary of the invention

[0003] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a channel frequency conversion device and method for 5G communication signal testing, which has a reasonable design, overcomes the shortcomings of the prior art, and has good effects.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A channel frequency conversion device for 5G communication signal testing, comprising a switch selection circuit, a power attenuation circuit, an amplification circuit, a 400MHz to 6GHz frequency conversion circuit for channel one of a frequency band below 6GHz, a 6GHz to 43.5GHz frequency conversion circuit for channel two of a frequency band above 6GHz and a 43.5GHz to 76GHz frequency conversion circuit for channel three, a local oscillator frequency multiplication circuit, and a high-pass filter group;

[0006] The switch selection circuit includes a first two-to-one switch, a second two-to-one switch, a third two-to-one switch, a fourth two-to-one switch, a fifth two-to-one switch, a sixth two-to-one switch, and a seventh two-to-one switch;

[0007] A power attenuation circuit, comprising a first programmable step attenuator;

[0008] an amplifier circuit, comprising a first low noise amplifier, a first amplifier and a fourth amplifier;

[0009] The input end of the first programmable step attenuator is connected to one end of a first two-choice switch receiving an input signal, the output end is connected to the input end of the first low noise amplifier, and the output end of the first low noise amplifier is connected to one end of a second two-choice switch;

[0010] The 400MHz-6GHz frequency conversion circuit of the first frequency channel of the frequency band below 6GHz comprises a first low-pass filter, a first mixer, a first band-pass filter, a second amplifier, a second mixer and a second low-pass filter connected in sequence, wherein the output end of the second low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the first low-pass filter is connected to one end of the second two-to-one switch;

[0011] The 6GHz-43.5GHz frequency conversion circuit of the second frequency channel in the frequency band above 6GHz includes a switch filter component, a third mixer, a second bandpass filter, a third amplifier, a fifth two-to-one switch, a fourth mixer and a third low-pass filter connected in sequence, wherein the output end of the third low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the switch filter component is connected to one end of the second two-to-one switch;

[0012] The 43.5 GHz to 76 GHz frequency conversion circuit of the third channel in the frequency band above 6 GHz includes a second programmable step attenuator, a second low noise amplifier, a fifth mixer, a third band pass filter, a fifth amplifier, a seventh two-to-one switch, a sixth mixer and a fourth low pass filter connected in sequence, wherein the input end of the second programmable step attenuator is connected to one end of the first two-to-one switch;

[0013] Local oscillator frequency multiplication circuit, including a frequency doubler and a frequency quadrupler;

[0014] A high-pass filter group, comprising a first high-pass filter and a second high-pass filter;

[0015] One end of the third two-to-one switch is connected to the first local oscillator output provided externally, one end is connected to the local oscillator input end of the first mixer, and the other end is connected to one end of the quadrupler;

[0016] The first local oscillator, the third two-choose-one switch, the quadrupler, the first high-pass filter, the fourth two-choose-one switch, the doubler, the second high-pass filter, the fourth amplifier, and the fifth mixer provided externally are connected in sequence through a line; the output end of the fourth amplifier is connected to the local oscillator input end of the fifth mixer;

[0017] A third terminal of the third two-to-one switch is connected to the local oscillator input terminal of the first mixer;

[0018] A third end of the fourth two-to-one switch is connected to the first amplifier through a line;

[0019] The local oscillator input terminals of the second mixer, the fourth mixer and the sixth mixer are respectively connected to the local oscillator signal output terminals of the second local oscillator, the third local oscillator and the fourth local oscillator provided externally.

[0020] Preferably, the power attenuation range of the power attenuation circuit is 10-70 dBc, and the step size is 10 dBc.

[0021] Preferably, the output frequency range of the first local oscillator provided externally is 2 to 10 GHz, the output frequency range of the quadrupler is 10 to 40 GHz, the output frequency range of the doubler is 39 GHz to 72 GHz, the output frequency of the second local oscillator is 2.8 GHz, the output frequency of the third local oscillator is 4.6208 GHz, the output frequency of the fourth local oscillator is 8 GHz, the first high-pass filter is 10 GHz, and the second high-pass filter is 39 GHz.

[0022] Preferably, in the 400MHz-6GHz frequency conversion part circuit of channel one in the frequency band below 6GHz, the RF input frequency range of the first mixer is 400MHz-6GHz, the input local oscillator frequency range is 2.95424-8.55424GHz, the intermediate frequency signal frequency generated by mixing is 2.55424GHz, the passband frequency of the first bandpass filter is 2.45424GHz-2.65424GHz, the in-band insertion loss is not more than 1dB, the out-of-band suppression is not less than 60dB, and the intermediate frequency signal frequency generated by mixing of the second mixer is 245.76MHz.

[0023] Preferably, in the 6-43.5 GHz frequency conversion part circuit of channel 2 in the frequency band above 6 GHz, the RF input frequency range of the third mixer is 6-43.5 GHz, the input local oscillator frequency range is 10.37504-39.37504 GHz, the intermediate frequency signal frequency generated by mixing is 4.37504 GHz, the passband frequency of the second bandpass filter is 3.87504-4.87504 GHz, the in-band insertion loss is not more than 1 dB, and the out-of-band suppression is not less than 60 dB; the intermediate frequency signal frequency generated by mixing by the fourth mixer is 245.76 MHz; the intermediate frequency signal generated by mixing by the third mixer is input to the sixth mixer after being selected by the fifth two-to-one switch and the seventh two-to-one switch, and the sixth mixer generates an intermediate frequency signal of 3.62496 GHz by mixing.

[0024] Preferably, in the 43.5-76 GHz frequency conversion part circuit of channel three in the frequency band above 6 GHz, the RF input frequency range of the fifth mixer is 43.5-76 GHz, the input local oscillator frequency range is 39.12496-71.62496 GHz, the intermediate frequency signal frequency generated by mixing is 4.37504 GHz, the passband frequency of the third bandpass filter is 3.87504-4.87504 GHz, the in-band insertion loss is not more than 1 dB, and the out-of-band suppression is not less than 60 dB; the signal output by the fifth mixer is input to the sixth mixer after filtering, power amplification and switch selection, and the sixth mixer generates an intermediate frequency signal of 3.62496 GHz by mixing.

[0025] In addition, the present invention also mentions a channel frequency conversion method for 5G communication signal testing, which adopts the channel frequency conversion device for 5G communication signal testing as described above, and specifically includes the following steps:

[0026] Step 1: When the 5G signal to be measured is in the 400MHz to 6GHz frequency band below 6GHz, the frequency conversion equation is LO1-RF=2.55424GHz, where LO1 is the input local oscillator frequency of the first mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the first mixer is calculated according to the frequency conversion equation based on the frequency of the 5G signal; the output intermediate frequency of the second mixer is 245.76MHz calculated by LO2-2.55424GHz=245.76MHz, where LO2 is the input local oscillator frequency of the second mixer;

[0027] Step 2: When the 5G signal to be tested is in the 6-43.5GHz frequency band above 6GHz, if the RF frequency range is 6-35GHz, the frequency conversion equation is LO3-RF=4.37504GHz; if the RF frequency range is 35-43.5GHz, the frequency conversion equation is RF-LO3=4.37504GHz, where LO3 is the input local oscillator frequency of the third mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the third mixer is calculated according to the frequency conversion equation based on the 5G signal frequency. rate; when the bandwidth of the 5G signal is 200MHz, the output intermediate frequency of the fourth mixer is 245.76MHz calculated by LO4-4.37504GHz=245.76MHz, where LO4 is the input local oscillator frequency of the fourth mixer; when the bandwidth of the 5G signal is 1GHz, the output intermediate frequency of the sixth mixer is 3.62496GHz calculated by LO6-4.37504GHz=3.62496GHz, where LO6 is the input local oscillator frequency of the sixth mixer;

[0028] Step 3: When the 5G signal to be measured is in the frequency band of 43.5-76 GHz above 6 GHz, the frequency conversion equation is RF-LO5=4.37504 GHz, where LO5 is the input local oscillator frequency of the fifth mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the fifth mixer is calculated according to the frequency conversion equation based on the frequency of the 5G signal; the output intermediate frequency of the sixth mixer is 3.62496 GHz calculated by LO6-4.37504 GHz=3.62496 GHz, where LO6 is the input local oscillator frequency of the sixth mixer.

[0029] Beneficial technical effects brought by the present invention:

[0030] The present invention uses frequency conversion channel one, frequency conversion channel two and frequency conversion channel three to achieve wide frequency coverage of 0.4-76GHz for frequency conversion channels; uses 0.4-76GHz broadband high-frequency test signals and externally provided 2-10GHz, 2.8GHz, 4.6208GHz, 8GHz low phase noise local oscillator signals for mixing, filtering, power adjustment and switch selection, so that the first intermediate frequency of channel one is 2.55424GHz, the second intermediate frequency is 245.76MHz, and the analysis bandwidth is 200MHz. The first intermediate frequency of channel two is 4.37504GHz, and the second intermediate frequencies are 245.76MHz and 3.62496GHz, respectively, and the analysis bandwidths are 200MHz and 1GHz, respectively. The first intermediate frequency of channel three is 4.37504GHz, the second intermediate frequency is 3.62496GHz, and the analysis bandwidth is 1GHz. It meets the index requirements of 5G signal test instruments for frequency conversion channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the principle block diagram of the frequency conversion channel device. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1 As shown, a channel frequency conversion device for 5G communication signal testing includes a switch selection circuit, a power attenuation circuit, an amplification circuit, a 400MHz to 6GHz frequency conversion circuit for channel one of a frequency band below 6GHz, a 6GHz to 43.5GHz frequency conversion circuit for channel two of a frequency band above 6GHz and a 43.5GHz to 76GHz frequency conversion circuit for channel three, a local oscillator frequency multiplication circuit, and a high-pass filter group.

[0034] The switch selection circuit includes a first two-to-one switch, a second two-to-one switch, a third two-to-one switch, a fourth two-to-one switch, a fifth two-to-one switch, a sixth two-to-one switch, and a seventh two-to-one switch;

[0035] A power attenuation circuit, comprising a first programmable step attenuator;

[0036] an amplifier circuit, comprising a first low noise amplifier, a first amplifier and a fourth amplifier;

[0037] The input end of the first programmable step attenuator is connected to one end of a first two-to-one switch receiving an input signal, the output end is connected to the input end of the first low noise amplifier, and the output end of the first low noise amplifier is connected to one end of a second two-to-one switch.

[0038] The 400MHz-6GHz frequency conversion circuit of the first frequency channel of the frequency band below 6GHz comprises a first low-pass filter, a first mixer, a first band-pass filter, a second amplifier, a second mixer and a second low-pass filter connected in sequence, wherein the output end of the second low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the first low-pass filter is connected to one end of the second two-to-one switch;

[0039] The 400MHz~6GHz frequency conversion circuit of channel one in the frequency band below 6GHz, the RF input frequency range of the first mixer is 400MHz~6GHz, the external first input local oscillator frequency range is 2.95424~8.55424GHz, and the frequency of the first intermediate frequency signal generated by mixing is 2.55424GHz. The external first input local oscillator frequency value is calculated according to the frequency conversion equation LO-RF=IF, where LO represents the first local oscillator frequency provided externally, RF represents the input signal frequency to be measured, and IF represents the intermediate frequency obtained by the first mixing of channel one. After the first intermediate frequency signal is band-pass filtered and power amplified, it is mixed with the second local oscillator provided externally to obtain a second intermediate frequency signal with a frequency of 245.76MHz. The second intermediate frequency signal is output to the intermediate frequency baseband module for signal analysis through low-pass filtering and switch selection.

[0040] The 6GHz to 43.5GHz frequency conversion circuit of channel 2 in the frequency band above 6GHz includes a switch filter component, a third mixer, a second bandpass filter, a third amplifier, a fifth two-to-one switch, a fourth mixer and a third low-pass filter connected in sequence, wherein the output end of the third low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the switch filter component is connected to one end of the second two-to-one switch.

[0041] The 6-43.5GHz frequency conversion circuit of the second channel in the frequency band above 6GHz, the RF input frequency range of the third mixer is 6-43.5GHz, the external first input local oscillator frequency range is 10.37504-39.37504GHz, the intermediate frequency signal frequency generated by mixing is 4.37504GHz, when the frequency range of the signal to be measured is 6-35GHz, the frequency conversion equation is LO-RF=IF, when the frequency range of the signal to be measured is 35-43.5GHz, the frequency conversion equation is RF-LO=IF. When the bandwidth of the signal to be measured is 200MHz, the intermediate frequency signal obtained by the first mixing of channel 2 is mixed with the second local oscillator provided externally after switch selection to obtain the second intermediate frequency signal with a frequency of 245.76MHz, which is output to the intermediate frequency baseband module for signal analysis through low-pass filtering and switch selection. When the bandwidth of the signal to be measured is 1 GHz, the intermediate frequency signal obtained by the first mixing of channel 2 is selected by the switch and mixed with the fourth local oscillator provided externally to obtain a second intermediate frequency signal with a frequency of 3.62496 GHz, which is output to the intermediate frequency baseband module for signal analysis through low-pass filtering.

[0042] The 43.5GHz to 76GHz frequency conversion circuit of channel three in the frequency band above 6GHz includes a second programmable step attenuator, a second low-noise amplifier, a fifth mixer, a third band-pass filter, a fifth amplifier, a seventh two-to-one switch, a sixth mixer and a fourth low-pass filter connected in sequence, and the input end of the second programmable step attenuator is connected to one end of the first two-to-one switch.

[0043] The 43.5-76GHz frequency conversion circuit of channel three in the frequency band above 6GHz, the RF input frequency range of the fifth mixer is 43.5-76GHz, the external first input local oscillator frequency range is 39.12496-71.62496GHz, the first intermediate frequency signal frequency generated by mixing is 4.37504GHz, and the external first input local oscillator frequency value is calculated according to the frequency conversion equation RF-LO=IF. After bandpass filtering, power amplification, and switch selection, the first intermediate frequency signal of channel three is mixed with the fourth local oscillator provided externally to obtain a second intermediate frequency signal with a frequency of 3.62496GHz, which is output to the intermediate frequency baseband module for signal analysis through low-pass filtering.

[0044] Local oscillator frequency multiplication circuit, including a frequency doubler and a frequency quadrupler;

[0045] A high-pass filter group, comprising a first high-pass filter and a second high-pass filter;

[0046] One end of the third two-to-one switch is connected to the first local oscillator output provided externally, one end is connected to the local oscillator input end of the first mixer, and the other end is connected to one end of the quadrupler;

[0047] The first local oscillator, the third two-choose-one switch, the quadrupler, the first high-pass filter, the fourth two-choose-one switch, the doubler, the second high-pass filter, the fourth amplifier, and the fifth mixer provided externally are connected in sequence through a line; the output end of the fourth amplifier is connected to the local oscillator input end of the fifth mixer;

[0048] A third terminal of the third two-to-one switch is connected to the local oscillator input terminal of the first mixer;

[0049] A third end of the fourth two-to-one switch is connected to the first amplifier through a line;

[0050] The local oscillator input terminals of the second mixer, the fourth mixer and the sixth mixer are respectively connected to the local oscillator signal output terminals of the second local oscillator, the third local oscillator and the fourth local oscillator provided externally.

[0051] The power attenuation range of the power attenuation circuit is 10-70dBc, and the step size is 10dBc.

[0052] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A channel frequency conversion device for 5G communication signal testing, characterized in that: It includes a switch selection circuit, a power attenuation circuit, an amplification circuit, a 400MHz to 6GHz frequency conversion circuit for channel one of the frequency band below 6GHz, a 6GHz to 43.5GHz frequency conversion circuit for channel two of the frequency band above 6GHz and a 43.5GHz to 76GHz frequency conversion circuit for channel three, a local oscillator frequency multiplication circuit, and a high-pass filter group; The switch selection circuit includes a first two-to-one switch, a second two-to-one switch, a third two-to-one switch, a fourth two-to-one switch, a fifth two-to-one switch, a sixth two-to-one switch, and a seventh two-to-one switch; A power attenuation circuit, comprising a first programmable step attenuator; an amplifier circuit, comprising a first low noise amplifier, a first amplifier and a fourth amplifier; The input end of the first programmable step attenuator is connected to one end of a first two-choice switch receiving an input signal, the output end is connected to the input end of the first low noise amplifier, and the output end of the first low noise amplifier is connected to one end of a second two-choice switch; The 400MHz-6GHz frequency conversion circuit of the first frequency channel of the frequency band below 6GHz comprises a first low-pass filter, a first mixer, a first band-pass filter, a second amplifier, a second mixer and a second low-pass filter connected in sequence, wherein the output end of the second low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the first low-pass filter is connected to one end of the second two-to-one switch; The 6GHz-43.5GHz frequency conversion circuit of the second frequency channel in the frequency band above 6GHz includes a switch filter component, a third mixer, a second bandpass filter, a third amplifier, a fifth two-to-one switch, a fourth mixer and a third low-pass filter connected in sequence, wherein the output end of the third low-pass filter is connected to one end of the sixth two-to-one switch, and the input end of the switch filter component is connected to one end of the second two-to-one switch; The 43.5 GHz to 76 GHz frequency conversion circuit of the third channel in the frequency band above 6 GHz includes a second programmable step attenuator, a second low noise amplifier, a fifth mixer, a third band pass filter, a fifth amplifier, a seventh two-to-one switch, a sixth mixer and a fourth low pass filter connected in sequence, wherein the input end of the second programmable step attenuator is connected to one end of the first two-to-one switch; Local oscillator frequency multiplication circuit, including a frequency doubler and a frequency quadrupler; A high-pass filter group, comprising a first high-pass filter and a second high-pass filter; One end of the third two-to-one switch is connected to the first local oscillator output provided externally, one end is connected to the local oscillator input end of the first mixer, and the other end is connected to one end of the quadrupler; The first local oscillator, the third two-choose-one switch, the quadrupler, the first high-pass filter, the fourth two-choose-one switch, the doubler, the second high-pass filter, the fourth amplifier, and the fifth mixer provided externally are connected in sequence through a line; the output end of the fourth amplifier is connected to the local oscillator input end of the fifth mixer; A third terminal of the third two-to-one switch is connected to the local oscillator input terminal of the first mixer; A third end of the fourth two-to-one switch is connected to the first amplifier through a line; The local oscillator input terminals of the second mixer, the fourth mixer and the sixth mixer are respectively connected to the local oscillator signal output terminals of the second local oscillator, the third local oscillator and the fourth local oscillator provided externally.

2. The channel frequency conversion device for 5G communication signal testing according to claim 1, characterized in that: The power attenuation range of the power attenuation circuit is 10-70dBc, and the step size is 10dBc.

3. The channel frequency conversion device for 5G communication signal testing according to claim 1, characterized in that: The output frequency range of the first local oscillator provided externally is 2 to 10 GHz, the output frequency range of the quadrupler is 10 to 40 GHz, the output frequency range of the doubler is 39 GHz to 72 GHz, the output frequency of the second local oscillator is 2.8 GHz, the output frequency of the third local oscillator is 4.6208 GHz, the output frequency of the fourth local oscillator is 8 GHz, the first high-pass filter is 10 GHz, and the second high-pass filter is 39 GHz.

4. The channel frequency conversion device for 5G communication signal testing according to claim 1, characterized in that: In the 400MHz~6GHz frequency conversion circuit of channel one in the frequency band below 6GHz, the RF input frequency range of the first mixer is 400MHz~6GHz, the local oscillator input frequency range is 2.95424~8.55424GHz, the intermediate frequency signal frequency generated by mixing is 2.55424GHz, the passband frequency of the first bandpass filter is 2.45424GHz~2.65424GHz, the in-band insertion loss is not more than 1dB, and the out-of-band suppression is not less than 60dB. The intermediate frequency signal frequency generated by mixing of the second mixer is 245.76MHz.

5. The channel frequency conversion device for 5G communication signal testing according to claim 1, characterized in that: In the 6-43.5GHz frequency conversion circuit of channel 2 in the frequency band above 6GHz, the RF input frequency range of the third mixer is 6-43.5GHz, the local oscillator input frequency range is 10.37504-39.37504GHz, the intermediate frequency signal frequency generated by mixing is 4.37504GHz, the passband frequency of the second bandpass filter is 3.87504-4.87504GHz, the in-band insertion loss is not more than 1dB, and the out-of-band suppression is not less than 60dB; the intermediate frequency signal frequency generated by mixing by the fourth mixer is 245.76MHz; the intermediate frequency signal generated by mixing by the third mixer is input to the sixth mixer after being selected by the fifth two-to-one switch and the seventh two-to-one switch, and the sixth mixer generates an intermediate frequency signal of 3.62496GHz by mixing.

6. The channel frequency conversion device for 5G communication signal testing according to claim 1, characterized in that: In the 43.5-76 GHz frequency conversion circuit of channel three in the frequency band above 6 GHz, the RF input frequency range of the fifth mixer is 43.5-76 GHz, the local oscillator input frequency range is 39.12496-71.62496 GHz, the intermediate frequency signal frequency generated by mixing is 4.37504 GHz, the passband frequency of the third bandpass filter is 3.87504-4.87504 GHz, the in-band insertion loss is not more than 1 dB, and the out-of-band suppression is not less than 60 dB; the signal output by the fifth mixer is input to the sixth mixer after filtering, power amplification and switch selection, and the sixth mixer generates an intermediate frequency signal of 3.62496 GHz by mixing.

7. A channel frequency conversion method for 5G communication signal testing, characterized in that: The channel frequency conversion device for testing a 5G communication signal as claimed in claim 1 specifically comprises the following steps Step 1: When the 5G signal to be measured is in the 400MHz to 6GHz frequency band below 6GHz, the frequency conversion equation is LO1-RF=2.55424GHz, where LO1 is the input local oscillator frequency of the first mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the first mixer is calculated according to the frequency conversion equation based on the frequency of the 5G signal; the output intermediate frequency of the second mixer is 245.76MHz calculated by LO2-2.55424GHz=245.76MHz, where LO2 is the input local oscillator frequency of the second mixer; Step 2: When the 5G signal to be tested is in the 6-43.5GHz frequency band above 6GHz, if the RF frequency range is 6-35GHz, the frequency conversion equation is LO3-RF=4.37504GHz; if the RF frequency range is 35-43.5GHz, the frequency conversion equation is RF-LO3=4.37504GHz, where LO3 is the input local oscillator frequency of the third mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the third mixer is calculated according to the frequency conversion equation based on the 5G signal frequency. rate; when the bandwidth of the 5G signal is 200MHz, the output intermediate frequency of the fourth mixer is 245.76MHz calculated by LO4-4.37504GHz=245.76MHz, where LO4 is the input local oscillator frequency of the fourth mixer; when the bandwidth of the 5G signal is 1GHz, the output intermediate frequency of the sixth mixer is 3.62496GHz calculated by LO6-4.37504GHz=3.62496GHz, where LO6 is the input local oscillator frequency of the sixth mixer; Step 3: When the 5G signal to be measured is in the frequency band of 43.5-76 GHz above 6 GHz, the frequency conversion equation is RF-LO5=4.37504 GHz, where LO5 is the input local oscillator frequency of the fifth mixer, and RF is the frequency of the 5G signal. The input local oscillator frequency of the fifth mixer is calculated according to the frequency conversion equation based on the frequency of the 5G signal; the output intermediate frequency of the sixth mixer is 3.62496 GHz calculated by LO6-4.37504 GHz=3.62496 GHz, where LO6 is the input local oscillator frequency of the sixth mixer.

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