TR assembly signal distribution device for radio frequency test

Abstract

The utility model discloses a TR assembly signal distribution device for a radio frequency test. The shell is provided with a test system emission output port, a test system emission input port, a test system receiving input port, a test system receiving output port, a test system clock output port, a tested piece emission output interface, a tested piece emission input interface, a tested piece receiving input interface, a tested piece receiving output interface and a tested piece clock output interface. Two tested piece emission output channels, two tested piece emission input channels, eight tested piece receiving input channels, eight tested piece receiving output channels and two tested piece clock output channels are arranged between the first radio frequency switch group, the second radio frequency switch group, the third radio frequency switch group, the fourth radio frequency switch group and the fifth radio frequency switch group. According to the utility model, the test topology structure of each frequency band in the test system can be established through the radio frequency switch mechanism, and automatic test analysis of test items such as gain, conventional S parameters and stray of a product to be tested can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of radio frequency test, specifically relates to a TR assembly signal distribution device for radio frequency test. BACKGROUND

[0002] Now along with the high -speed development of communication, radar, radio etc. field, product integration is higher and higher, function is also more and more powerful, but simultaneously product's test increasingly complex, therefore automatic test equipment obtains the extensive application. Signal distribution network unit is the important component of automatic test equipment, avoids the complex wiring process in the test process, and signal distribution network unit realizes the flexible switching between test channels through the control to internal radio frequency switch. However, at present signal distribution network unit is often bulky, expensive, secondly, in the use scene of small volume, multiple channels measured piece, there is the problem of product fixation and wiring complex confusion. CONTENT OF UTILITY MODEL

[0003] The utility model discloses a TR assembly signal distribution device for radio frequency test, which aims to complete the construction of test topology of each test item through radio frequency switch mechanism switching.

[0004] The utility model mainly realizes through following technical scheme:

[0005] A TR assembly signal distribution device for radio frequency test, comprising a shell and a radio frequency switch mechanism, wherein the shell is provided with a test system transmission output port, a test system transmission input port, a test system receiving input port, a test system receiving output port, a test system clock output port, a measured piece transmission output interface, a measured piece transmission input interface, a measured piece receiving input interface, a measured piece receiving output interface and a measured piece clock output interface; the radio frequency switch mechanism comprises a first radio frequency switch group to a fifth radio frequency switch group;

[0006] The first radio frequency switch group to the fifth radio frequency switch group are respectively arranged between the test system transmission output port and the measured piece transmission output interface, between the test system transmission input port and the measured piece transmission input interface, between the test system receiving input port and the measured piece receiving input interface, between the test system receiving output port and the measured piece receiving output interface, and between the test system clock output port and the measured piece clock output interface;

[0007] The measured piece transmission output interface, measured piece transmission input interface, measured piece receiving input interface, measured piece receiving output interface and measured piece clock output interface are respectively provided with 2 measured piece transmission output channels, 2 measured piece transmission input channels, 8 measured piece receiving input channels, 8 measured piece receiving output channels and 2 measured piece clock output channels between the first to fifth radio frequency switch groups; the frequency band of the measured piece transmission output channel and measured piece receiving input channel is 20GHz-38GHz, the frequency band of the measured piece transmission input channel and measured piece receiving output channel is 1GHz-5GHz, and the frequency band of the measured piece clock output channel is 100MHz-20GHz.

[0008] In order to better realize the utility model, further, the front side of the shell is provided with a measured piece clock output interface, a measured piece transmission input interface and a measured piece receiving output interface; the back side is provided with a measured piece receiving input interface and a measured piece transmission output interface; the left side is provided with a measured piece power supply / control switching interface and a test system power supply / control switching interface; the right side is provided with a test system receiving input port, a test system transmission output port, a test system receiving output port, a test system transmission input port and a test system clock output port.

[0009] In order to better realize the utility model, further, the top of the shell is provided with a mounting platform, and the peripheral side of the mounting platform is provided with a plurality of mounting flanges.

[0010] In order to better realize the utility model, further, the radio frequency connector of the test system receiving input port, measured piece receiving input interface, test system transmission output port and measured piece transmission output interface is 2.92mm-K; the radio frequency connector of the test system transmission input port, measured piece transmission input interface, test system clock output port, measured piece clock output interface, measured piece receiving output interface and test system receiving output port is SMA-K.

[0011] In order to better realize the utility model, further, the first radio frequency switch group includes a first level SPDT switch, a second level first SPDT switch and a second level second SPDT switch, the test system transmission output port is connected with the second level first SPDT switch and the second level second SPDT switch through the first level SPDT switch, and the second level first SPDT switch and the second level second SPDT switch are connected with the measured piece transmission output interface through the measured piece transmission output channel respectively.

[0012] The third radio frequency switch group comprises a first SPDT switch, a second first SPDT switch, a second second SPDT switch, and a third first SPDT switch to a third fourth SPDT switch, the test system receiving input port is connected with the second first SPDT switch and the second second SPDT switch through the first SPDT switch, the second first SPDT switch is connected with the third first SPDT switch and the third second SPDT switch, the second second SPDT switch is connected with the third third SPDT switch and the third fourth SPDT switch, and the third first SPDT switch to the third fourth SPDT switch are connected with the measured piece receiving input interface through 2 measured piece receiving input channels respectively;

[0013] The fourth radio frequency switch group comprises a first SPDT switch, a second first SP4T switch and a second second SP4T switch, the test system receiving output port is connected with the second first SP4T switch and the second second SP4T switch through the first SPDT switch, and the second first SP4T switch and the second second SP4T switch are connected with the measured piece receiving output interface through 4 measured piece receiving output channels respectively;

[0014] The second radio frequency switch group and the fifth radio frequency switch group comprise SPDT switches respectively, the SPDT switch of the second radio frequency switch group is connected with the measured piece transmitting input interface through 2 measured piece transmitting input channels, and the SPDT switch of the fifth radio frequency switch group is connected with the measured piece clock output interface through 2 measured piece clock output channels.

[0015] In order to better realize the utility model, further, the SPDT switches in the first radio frequency switch group and the third radio frequency switch group are ISW-2040DT type radio frequency switches, the SPDT switches in the second radio frequency switch group and the fourth radio frequency switch group are PE42520 type radio frequency switches, the SP4T switches in the fourth radio frequency switch group are PE42540 type radio frequency switches, and the SPDT switches in the fifth radio frequency switch group are VD75251 type radio frequency switches.

[0016] In order to better realize the utility model, further, the communication control circuit further comprises an FPGA, an RS422 communication circuit, a driving control circuit and a power management circuit, the FPGA is connected with the RS422 communication circuit, the driving control circuit and the power management circuit respectively, the FPGA is connected with the upper computer through the RS422 communication circuit and is connected with the radio frequency switch mechanism through the driving control circuit.The structure and control method of the communication control circuit are prior art, so details are not repeated.

[0017] Further, the model of the FPGA is XC6SLX45-2CSG484I, the RS422 communication circuit comprises a conversion chip with the model of MAX3490ESA 422, and the power management circuit comprises a voltage stabilizer with the model of LT1963.

[0018] The utility model discloses the following beneficial effects:

[0019] (1) the utility model discloses a radio frequency switch mechanism can realize the construction of the test topology structure of each frequency band in test system, can realize the gain of the product to be measured, conventional S parameter, stray etc. Test item carries out automatic test analysis. Secondly, the compact layout of the shell structure of the utility model discloses, the shell still designs the mounting flange and fixes the measured piece, shortens the wiring of equipment to the measured piece, has the advantages such as small volume, many channels.

[0020] (2) the utility model discloses through communication control circuit receiving control instruction, drive the switching of radio frequency switch, complete the construction of the test topology of each test item, to cooperate with other instrument equipment in test system, realize the gain of the product to be measured, conventional S parameter, stray etc. Test item carries out automatic test analysis. Secondly, the utility model discloses the multiway SMP quick insertion tooling of being equipped with, can realize the quick pluggable of test cable assembly and the multiple SMP interface of measured piece. And through power supply / control adapter, the wiring is better neat and beautiful, reduces the space occupied, and also has the protection effect to the measured piece control and power supply interface. The utility model discloses still have wide temperature working capacity, satisfy the high and low temperature test demand of the product to be measured.

[0021] (3) the overall size of the utility model can be long 130mm * wide 80mm * high 30mm (not including connector), and the weight is about 2kg, and the volume is far less than similar products, has the advantage that the structure is very small and light. Secondly, the utility model discloses simple structure, high integration: all communication control circuit, radio frequency electronic switch can be integrated on a PCB board, there is no a large number of wiring inside, and the number of radio frequency channels is up to 22, and its cost is low;The utility model discloses quick and convenient to use: through the integrated SMP quick insertion tooling of directional design, the cable assembly of the utility model discloses can be realized with the multiple SMP interface of measured piece fast butt joint. The utility model discloses through mounting flange and realizes fixed measured piece, shortens radio frequency line, and uses quick and convenient, and simultaneously avoids the damage caused by the mistake of bumping radio frequency line in the test of measured piece radio frequency interface to the greatest extent. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is network topology diagram of TR assembly signal distribution device for radio frequency test of the utility model;

[0023] Figure 2 It is principle diagram of RS422 communication circuit;

[0024] Figure 3 The schematic diagram of the power management circuit;

[0025] Figure 4 The overall structure schematic diagram of the TR assembly signal distribution device for radio frequency test;

[0026] Figure 5 The front view of Figure 4 ;

[0027] Figure 6 The rear view of Figure 4 ;

[0028] Figure 7 The right view of Figure 4 ;

[0029] Figure 8 The left view of Figure 4 ;

[0030] Figure 9 The top view of Figure 4 .

[0031] Wherein: 1 is a test system receiving input port, 2 is a test system transmitting output port, 3 is a test system receiving output port, 4 is a test system transmitting input port, 5 is a test system clock output port, 6 is a mounting flange, 7 is a measured piece receiving input interface, 8 is a measured piece clock output interface, 9 is a measured piece receiving output interface, 10 is a measured piece power supply / control switching interface, 11 is a test system power supply / control switching interface, 12 is a measured piece transmitting input interface, 13 is a measured piece transmitting output interface, and 14 is a mounting platform. DETAILED DESCRIPTION

[0032] Example 1:

[0033] A TR assembly signal distribution device for radio frequency test mainly comprises a shell, a communication control circuit and a radio frequency switch mechanism. In the use process, the communication control circuit receives a control instruction and drives the radio frequency switch mechanism to switch, thereby completing the construction of a test topology of each test item, so as to realize the automatic test analysis of the gain, the conventional S parameter, the stray and other test items of the product to be tested in cooperation with other instruments and equipment in the test system.

[0034] As Figure 1As shown, the inputs and outputs in this invention are based on the direction of the signal flow from the device under test (DUT). This invention includes a test system transmit output port 2, a test system transmit input port 4, a test system receive input port 1, a test system receive output port 3, a test system clock output port 5, and a DUT transmit output interface 13, a DUT transmit input interface 12, a DUT receive input interface 7, a DUT receive output interface 9, and a DUT clock output interface 8. This invention has a total of 27 RF interfaces, which can form 22 channels. The 1-5GHz band includes 2 DUT transmit input channels and 8 DUT receive output channels; the 20GHz-38GHz band includes 2 DUT transmit output channels and 8 DUT receive input channels; and the 100MHz-20GHz band includes 2 DUT clock output channels. This invention also includes a DUT power supply / control adapter 10 and a test system power supply / control adapter 11.

[0035] Preferably, such as Figure 1 As shown, the SPDT switch on the transmit output channel of the device under test (DUT) is an ISW-2040DT RF switch. Since the RF transmit output channel operates at a frequency of 20GHz to 38GHz, the ISW-2040DT RF switch is selected. It supports operating frequencies from 20GHz to 40GHz, can withstand power up to +25dBm, has a channel insertion loss ≤1.8dB (at input frequencies of 38GHz and below), and isolation better than 40dB. Furthermore, the SPDT switch on the receive input channel of the DUT is also an ISW-2040DT RF switch. The operating frequency range of the receive input channel is the same as that of the transmit output channel, and the same SPDT is selected; its performance specifications will not be elaborated here.

[0036] Preferably, such as Figure 1 As shown, the SPDT switch on the transmit input channel of the device under test (DUT) is a PE42520 RF switch. The RF transmit input channel operates at a frequency of 1GHz to 5GHz, and the PE42520 RF switch is selected for this design. It supports operating frequencies from 9kHz to 13GHz, can withstand power up to +26dBm, has a channel insertion loss ≤0.8dB (when the input frequency is ≤5GHz), and an isolation better than 45dB (when the input frequency is ≤5GHz). Furthermore, the SPDT switch on the receive output channel of the DUT is also a PE42520 RF switch. The operating frequency range of the receive input channel is the same as that of the transmit input channel, and the same SPDT is selected; its performance specifications will not be elaborated here.

[0037] Preferably, the SP4T switch on the measured piece receiving output channel is a PE42540 type radio frequency switch. The working frequency of the radio frequency receiving output channel is 1GHz-5GHz, and the PE42540 type radio frequency switch is selected in the design. Its working frequency can support 9kHz-8GHz, and can withstand a power of +20dBm, the channel insertion loss is ≤1.0dB (when the input frequency is ≤5GHz), and the isolation is better than 37dB (when the input frequency is ≤5GHz).

[0038] Preferably, the SPDT switch on the measured piece clock output channel is a VD75251 type radio frequency switch. The working frequency of the clock output channel is 100MHz-20GHz, and the VD75251 type radio frequency switch is selected in the design. Its working frequency can support DC-20GHz, and can withstand a power of +23dBm, the channel insertion loss is ≤1.5dB, and the isolation is 50dB.

[0039] Preferably, the communication control circuit includes FPGA, RS422 communication circuit, drive control circuit, power management circuit. Specifically, the model of FPGA is XC6SLX45-2CSG484I, this chip has 43661 Logic Cells, 2088 kbram, 58 DSP Slices, and a maximum of 408 IO interfaces, which fully meets the control requirements. As shown in Figure 2 The RS422 communication circuit uses a mature design circuit to process the differential control signal equally, and then inputs it to the MAX3490ESA 422 conversion chip for conversion, and then inputs it to the FPGA to parse the instruction to control the switch. The drive control circuit is a prior art, and the selected switch control is compatible with TTL and COMS control, so the control pin can be directly connected to the FPGA I / O port. As shown in Figure 3 The power management circuit uses LT1963 as the main device of the power management circuit.

[0040] Preferably, as shown in Figures 4-9 The external interface is located on the side of the shell, and the working frequency of the test system receiving input port 1, the measured piece receiving input interface 7, the test system transmitting output port 2, the measured piece transmitting output interface 13 is higher than 20GHz, and the radio frequency connector selects 2.92mm-K; the working frequency of the test system transmitting input port 4, the measured piece transmitting input interface 12, the test system clock output port 5, the measured piece clock output interface 8, the measured piece receiving output interface 9, and the test system receiving output port 3 is lower than 20GHz, and the radio frequency connector selects SMA-K. The design has a J30J high-speed connector for signal switching and crosslinking with the bus interface and power supply interface of the product to be tested.

[0041] Preferably, the utility model discloses a SMP fast insertion tooling can realize the utility model discloses the cable assembly and the measured piece multiple SMP interface quick butt joint of being measured.

[0042] Preferably, the utility model discloses the size is 130mm long * 80mm wide * 30mm (not including connector), and the weight is about 2kg, and the structure adopts aluminum alloy material, and the surface carries out black conductive oxidation treatment, improves its structural corrosion resistance. Its top is mounting platform 14, and is designed with mounting flange 6, is used for fixedly placing the product to be measured, can be designed according to different product appearance.

[0043] The utility model has the following advantages:

[0044] a) all external interfaces are designed on the side of the equipment, and are arranged in different areas according to the interaction object, which is convenient for users to wire;

[0045] b) the utility model discloses the cable assembly and the measured piece multiple SMP interface quick plug of being measured can be realized through the multi-path SMP fast insertion tooling, and the fast insertion tooling can be designed according to the positional relationship between the SMP interfaces of the measured piece;

[0046] c) the switching control of multiple radio frequency channels can be realized;

[0047] d) the transmitting output channel switch one end carries load, avoids the high-frequency high-power signal of measured piece emission reflection damage measured piece and interference system test;

[0048] e) has the program control function;

[0049] f) has the signal switching function, the utility model switches control and power supply line, and then uses the self-made adaptation cable to connect the power supply and control signal into the corresponding measured piece port, which not only ensures the appearance of wiring, but also avoids the damage of cable pulling to the interface of measured piece;

[0050] g) the measured piece can be fixed, the cable length is shortened, and the interface damage caused by the mistake of cable or measured piece in the test process is avoided;

[0051] h) high integration, and the product radio frequency switch adopts radio frequency electronic switch, and the communication control circuit and radio frequency switch are integrated on a PCB.

[0052] i) the printed board three-proofing treatment can meet the harsh environmental temperature requirement.

[0053] j) small structure, light weight.

[0054] The utility model discloses volume is very small, the degree of integration is high, the radio frequency switch mechanism, communication circuit among them can be integrated on a PCB board, and the whole size of equipment can be set as long 130mm wide 80mm 30mm height, far less than the conventional same type product, possesses 22 radio frequency passageway and power supply / control switching interface. The utility model can realize the quick plugging of equipment cable assembly and the multiple channel SMP radio frequency connector of measured piece, and the SMP quick insertion tool is designed according to the position orientation between product SMP connector. The utility model designs measured piece mounting flange 6 and power supply / control line switching interface. Shorten the length of wiring, make the cable beautiful and orderly, greatly avoid the damage of measured piece interface caused by the movement and mistaken touch cable assembly of measured piece.

[0055] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification and equivalent change of the above embodiment according to the technical essence of the utility model all fall within the protection scope of the utility model.

Claims

1. A signal distribution device for a radio frequency (RF) test TR component, characterized in that, The device includes a housing and an RF switch mechanism. The housing is provided with a test system transmit output port (2), a test system transmit input port (4), a test system receive input port (1), a test system receive output port (3), a test system clock output port (5), a device under test (DUT) transmit output interface (13), a DUT transmit input interface (12), a DUT receive input interface (7), a DUT receive output interface (9), and a DUT clock output interface (8). The RF switch mechanism includes a first RF switch group to a fifth RF switch group. The first to the fifth RF switch groups are respectively provided between the test system transmit output port (2) and the device under test transmit output interface (13), between the test system transmit input port (4) and the device under test transmit input interface (12), between the test system receive input port (1) and the device under test receive input interface (7), between the test system receive output port (3) and the device under test receive output interface (9), and between the test system clock output port (5) and the device under test clock output interface (8); The device under test (DUT) transmit output interface (13), DUT transmit input interface (12), DUT receive input interface (7), DUT receive output interface (9), and DUT clock output interface (8) are respectively provided with two DUT transmit output channels, two DUT transmit input channels, eight DUT receive input channels, eight DUT receive output channels, and two DUT clock output channels between the first RF switch group to the fifth RF switch group; the frequency bands of the DUT transmit output channels and DUT receive input channels are 20GHz~38GHz, the frequency bands of the DUT transmit input channels and DUT receive output channels are 1GHz~5GHz, and the frequency band of the DUT clock output channels is 100MHz~20GHz.

2. The signal distribution device for a radio frequency test TR component according to claim 1, characterized in that, The front side of the housing is provided with a device under test (DUT) clock output interface (8), a DUT transmit input interface (12), and a DUT receive output interface (9); the rear side is provided with a DUT receive input interface (7) and a DUT transmit output interface (13); the left side is provided with a DUT power supply / control converter interface (10) and a test system power supply / control converter interface (11); the right side is provided with a test system receive input port (1), a test system transmit output port (2), a test system receive output port (3), a test system transmit input port (4), and a test system clock output port (5).

3. The signal distribution device for a radio frequency test TR component according to claim 2, characterized in that, The top of the housing is provided with an installation platform (14), and the periphery of the installation platform (14) is provided with several installation flanges (6).

4. The signal distribution device for a radio frequency test TR component according to claim 1, characterized in that, The RF connectors for the test system receiving input port (1), the device under test receiving input interface (7), the test system transmitting output port (2), and the device under test transmitting output interface (13) are 2.92mm-K; the RF connectors for the test system transmitting input port (4), the device under test transmitting input interface (12), the test system clock output port (5), the device under test clock output interface (8), the device under test receiving output interface (9), and the test system receiving output port (3) are SMA-K.

5. A signal distribution device for a radio frequency test TR component according to any one of claims 1-4, characterized in that, The first radio frequency switch group includes a first-level SPDT switch, a second-level first SPDT switch and a second-level second SPDT switch. The test system transmit output port (2) is connected to the second-level first SPDT switch and the second-level second SPDT switch through the first-level SPDT switch. The second-level first SPDT switch and the second-level second SPDT switch are connected to the transmit output interface (13) of the device under test through the transmit output channel of the device under test. The third RF switch group includes a first-level SPDT switch, a second-level first SPDT switch, a second-level second SPDT switch, and third-level first to third-level fourth SPDT switches. The test system receiving input port (1) is connected to the second-level first SPDT switch and the second-level second SPDT switch through the first-level SPDT switch. The second-level first SPDT switch is connected to the third-level first SPDT switch and the third-level second SPDT switch. The second-level second SPDT switch is connected to the third-level third SPDT switch and the third-level fourth SPDT switch. The third-level first to third-level fourth SPDT switches are connected to the device under test receiving input interface (7) through two device under test receiving input channels. The fourth RF switch group includes a first-level SPDT switch, a second-level first SP4T switch and a second-level second SP4T switch. The test system receive output port (3) is connected to the second-level first SP4T switch and the second-level second SP4T switch through the first-level SPDT switch. The second-level first SP4T switch and the second-level second SP4T switch are connected to the test device receive output interface (9) through four test device receive output channels. The second RF switch group and the fifth RF switch group each include an SPDT switch. The SPDT switch of the second RF switch group is connected to the transmit input interface (12) of the device under test through two transmit input channels of the device under test. The SPDT switch of the fifth RF switch group is connected to the clock output interface (8) of the device under test through two clock output channels of the device under test.

6. The signal distribution device for a radio frequency test TR component according to claim 5, characterized in that, The SPDT switches in the first and third RF switch groups are ISW-2040DT type RF switches; the SPDT switches in the second and fourth RF switch groups are PE42520 type RF switches; the SP4T switch in the fourth RF switch group is a PE42540 type RF switch; and the SPDT switch in the fifth RF switch group is a VD75251 type RF switch.

7. The signal distribution device for a radio frequency test TR component according to claim 1, characterized in that, It also includes a communication control circuit, which includes an FPGA, an RS422 communication circuit, a drive control circuit, and a power management circuit. The FPGA is connected to the RS422 communication circuit, the drive control circuit, and the power management circuit, respectively. The FPGA is connected to the host computer through the RS422 communication circuit and to the radio frequency switch mechanism through the drive control circuit.

8. A signal distribution device for a radio frequency test TR component according to claim 7, characterized in that, The FPGA model is XC6SLX45-2CSG484I, the RS422 communication circuit includes a MAX3490ESA 422 converter chip, and the power management circuit includes a LT1963 voltage regulator.

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