A multi-channel cable broadband impedance testing device

Abstract

The utility model belongs to cable test technical field especially relates to a kind of multi-channel cable broadband impedance testing device, including the measurement and control circuit mainboard and extension circuit board connected;The measurement and control circuit mainboard includes signal source, detection module and microcontroller module;The extension circuit board includes RF radio frequency switch module and multi-channel directional coupler module;The control end of RF radio frequency switch module is with microcontroller module, output end is connected with multi-channel directional coupler module;The control end of signal source is with microcontroller module, output end is respectively connected with the input of RF radio frequency switch module, the input of detection module;Multi-channel directional coupler module is connected with the cable to be measured, output end is connected with the input of detection module, the output of detection module is connected with the input of microcontroller module.The utility model will signal source, detection module and microcontroller module as a measurement and control mainboard independence, RF radio frequency switch module and multi-channel directional coupler module as an extension circuit board independence, can realize flexible extension channel, also can be matched with existing single-channel broadband impedance test instrument and integrated, reduce upgrade cost.

Description

Technical Field

[0001] This utility model belongs to the field of cable testing technology, and specifically relates to a multi-channel cable broadband impedance testing device. Background Technology

[0002] Existing broadband impedance testers are mainly single-channel testers. Although a few papers have reported on multi-channel technology, these are all single-channel devices in terms of hardware and lack flexibility. Utility Model Content

[0003] The purpose of this invention is to provide a multi-channel cable broadband impedance testing device, thereby overcoming the shortcomings of existing broadband impedance testers that mainly focus on single-channel testing and lack flexibility. The specific technical solution is as follows: A multi-channel cable broadband impedance testing device includes a main board and an expansion board connected to each other; the main board includes a signal source, a detector module, and a microcontroller module; the expansion board includes an RF switch module and a multi-channel directional coupler module. The control terminal of the RF switch module is connected to the microcontroller module, and the output terminal is connected to the multi-channel directional coupler module. The control terminal and microcontroller module of the signal source are connected to the input terminal of the RF switch module and the input terminal of the detector module, respectively. The multi-channel directional coupler module is connected to the cable under test, and its output terminal is connected to the input terminal of the detector module. The output terminal of the detector module is connected to the input terminal of the microcontroller module.

[0004] Preferably, it further includes a transmission amplifier, the input of which is connected to the output of the signal source, and the output of which is connected to the input of the RF switching module.

[0005] Preferably, the system further includes a reflection amplifier, the input of which is connected to the reflection end of the multi-channel directional coupler module, and the output of which is connected to the input of the detection module.

[0006] Preferably, the device further includes a temperature and humidity sensor module, which is connected to the microcontroller module and is used to collect and measure the temperature and humidity of the environment.

[0007] Preferably, the device further includes a USB serial port module, which is connected to the microcontroller module and used for data interaction with external devices.

[0008] Preferably, the signal source is a DDS signal source.

[0009] Preferably, the multi-channel directional coupler module includes multiple directional couplers, each of which is connected to the RF radio frequency switch module.

[0010] Compared with existing technologies, this utility model has the following beneficial effects: This invention separates the signal source, detector module, and microcontroller module into a single measurement and control motherboard, and separates the RF switch module and multi-channel directional coupler module into a single expansion circuit board. This allows for flexible channel expansion and can also be integrated with existing single-channel broadband impedance testers, reducing upgrade costs. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0012] Figure 1 This is a schematic diagram illustrating the principle of this utility model.

[0013] Figure 2 This is the circuit schematic of the microcontroller module.

[0014] Figure 3 This is the circuit schematic of the signal source.

[0015] Figure 4 This is a circuit schematic for an RF switch module and a multi-channel directional coupler module.

[0016] Figure 5 This is the circuit schematic of a temperature and humidity sensor module.

[0017] Figure 6 This is the circuit schematic of a USB serial port module. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0022] like Figure 1 As shown, this embodiment provides a multi-channel cable broadband impedance testing device, including a measurement and control circuit main board and an expansion circuit board connected to each other; the measurement and control circuit main board includes a signal source, a detector module and a microcontroller module; the expansion circuit board includes an RF switch module and a multi-channel directional coupler module; The control terminal of the RF switch module is connected to the microcontroller module, and the output terminal is connected to the multi-channel directional coupler module. The control terminal of the signal source is connected to the microcontroller module, and the output terminal is connected to the input terminal of the RF switch module and the input terminal of the detector module, respectively. The multi-channel directional coupler module is connected to the cable under test, and its output terminal is connected to the input terminal of the detector module. The output terminal of the detector module is connected to the input terminal of the microcontroller module.

[0023] In a preferred embodiment, the multi-channel cable broadband impedance testing device further includes a transmission amplifier, the input of which is connected to the output of the signal source, and the output of which is connected to the input of the RF switch module.

[0024] In a preferred embodiment, the multi-channel cable broadband impedance testing device further includes a reflection amplifier, the input of which is connected to the reflection end of the multi-channel directional coupler module, and the output of which is connected to the input of the detector module.

[0025] In a preferred embodiment, the microcontroller module includes multiple ADC conversion channels, the number of which is greater than or equal to the number of channels in the reflective amplifier. In this embodiment, the microcontroller module can be a microcontroller with 12 or more ADC channels, such as... Figure 2 As shown, the STC32G12K128-Beta-LQFP48 microcontroller can be selected, and its IO control ports can generate pulse signals with controllable frequency.

[0026] As a preferred embodiment, a DDS signal source is selected as the signal source. For example... Figure 3 As shown, the signal source includes a broadband RF frequency synthesizer chip ADF4351, and both the transmission amplifier and the reflection amplifier include a broadband RF / IF gain module amplifier chip ADL5611. The detection module includes a detector chip AD8302.

[0027] Figure 3 In this circuit, the broadband RF frequency synthesizer chip ADF4351 serves as the signal source, controlled by the microcontroller module's I / O ports. One signal output from the ADF4351 is amplified by the transmission amplifier ADL5611 and then split into two parallel branches by the RF power divider STCP210. One branch is output as a signal to the subsequent RF switching module. The other DC signal is output to input A of the detector chip AD8302 as a reference signal. Figure 3 There is also an input signal from the RF2 terminal, which is the feedback reflection signal from the subsequent directional coupler test. After being amplified by the reflection amplifier ADL5611, it enters the input terminal B of the detector chip AD8302 as a test signal. This enables a better signal comparison function, realizing the output of the amplitude and phase difference between the input signals at input terminals A and B. Figure 3 RF1 is the output RF interface, which connects to the RF switch module. RF2 is the RF interface for the reflection feedback end, which connects to the reflection end of the directional coupler.

[0028] In a preferred embodiment, the multi-channel directional coupler module includes multiple directional couplers, each of which is connected to an RF radio frequency switch module. Figure 4As shown, the RF switch module adopts an 8-channel module with 1 to 8 switching, corresponding to the measurement channels of 8 directional couplers. Each directional coupler channel includes a directional coupler DBTC-12-4L+.

[0029] J4 is the SMA port for the signal source input of the RF switch module, and... Figure 3 Connected to RF1 port, the COUP terminal of the DBTC-12-4L+ directional coupler is the reflection feedback terminal. The IN and OUT terminals of the DBTC-12-4L+ directional coupler are not distinguished here. Figure 4 In this configuration, the OUT terminal is used as the output terminal, and the IN terminal is connected to the cable under test. During testing, when the RF switch module switches to the corresponding port, the OUT terminal of the corresponding directional coupler DBTC-12-4L+ receives the test signal, the IN terminal inputs the signal to the cable, and the COUP terminal receives the reflected feedback signal from the cable at the IN terminal. It should be noted that here, the IN and OUT terminals are connected: the OUT terminal is connected to the output direction of the signal source, and the IN terminal is connected to the load (the cable under test) to ensure that the COUP terminal acts as the receiver of the feedback signal. The remaining floating ports are not needed in this embodiment and will not be explained further.

[0030] In a preferred embodiment, the multi-channel cable broadband impedance testing device further includes a temperature and humidity sensor module, which is connected to the microcontroller module and used to collect the temperature and humidity of the measurement environment. Figure 5 As shown, the temperature and humidity sensor module of this utility model includes a temperature and humidity sensor chip SHT30_DIS. After collecting the temperature and humidity of the measurement environment, it is input into the microcontroller module, which can be used for subsequent measurement data correction. This is an extended function.

[0031] In a preferred embodiment, the device further includes a USB serial port module, which is connected to the microcontroller module for data interaction with external devices. Figure 6 As shown, the USB serial port module includes a USB interface chip and a USB to serial port chip, wherein the USB interface chip is selected as USB_TYPEC, and the USB to serial port chip is selected as chip CP2102.

[0032] Next, the working principle of this embodiment will be described in detail so that those skilled in the art can better understand this utility model: This invention utilizes a microcontroller module to control a signal source that generates a test signal. The test signal output is divided into two paths: one path is input to a detector module as a reference signal, and the other path is input to an RF switch module. The microcontroller module controls the RF switch module to switch to the corresponding test channel. The directional coupler connected to the corresponding test channel inputs the feedback signal from the cable under test into the detector module. The detector module compares the reference signal and the feedback signal to obtain the amplitude and phase comparison results, and inputs these results back to the microcontroller module. The microcontroller module can be connected to a display screen to show the amplitude and phase comparison results.

[0033] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A multi-channel cable broadband impedance testing device, characterized in that, It includes a connected measurement and control circuit main board and an expansion circuit board; the measurement and control circuit main board includes a signal source, a detector module and a microcontroller module; the expansion circuit board includes an RF switch module and a multi-channel directional coupler module; The control terminal of the RF switch module is connected to the microcontroller module, and the output terminal is connected to the multi-channel directional coupler module. The control terminal and microcontroller module of the signal source are connected to the input terminal of the RF switch module and the input terminal of the detector module, respectively. The multi-channel directional coupler module is connected to the cable under test, and its output terminal is connected to the input terminal of the detector module. The output terminal of the detector module is connected to the input terminal of the microcontroller module.

2. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, It also includes a transmission amplifier, the input of which is connected to the output of the signal source, and the output of which is connected to the input of the RF switch module.

3. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, It also includes a reflection amplifier, the input of which is connected to the reflection end of the multi-channel directional coupler module, and the output end is connected to the input end of the detection module.

4. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, The device also includes a temperature and humidity sensor module, which is connected to the microcontroller module and is used to collect and measure the temperature and humidity of the environment.

5. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, The device also includes a USB serial port module, which is connected to the microcontroller module and is used to interact with external devices.

6. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, The signal source is selected as a DDS signal source.

7. The multi-channel cable broadband impedance testing device according to claim 1, characterized in that, The multi-channel directional coupler module includes multiple directional couplers, each of which is connected to the RF radio frequency switch module.

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