CN205176076U - Switching device who connects multiport testing arrangement and multiport device - Google Patents

Abstract

The utility model discloses a switch device connected with a multi-port testing device and a multi-port device. A circuit board is arranged inside the switch device, and a switch control circuit is arranged on the circuit board. The switch control circuit is provided with: terminal, a first connection terminal, a second connection terminal, and a switch. The switch has a control terminal. The control terminal makes the switch operate based on the external command received by the switch control circuit. When the switch connects the test terminal to the first When one connection end is connected, the corresponding port of the multi-port device is connected with the multi-port testing device, and when the switching switch connects the test end with the second connection end, the corresponding port of the multi-port device is connected with the matching load. The device can eliminate the fluctuation phenomenon of the test curve, and the index curves such as insertion loss and return loss of the test multi-port device will be smoother, truly reflect the characteristics of the device, and improve the accuracy of the test result.

Description

Switching device for connecting multi-port test sets and multi-port devices

technical field

The utility model relates to the technical field of wireless communication, in particular to a switch device for connecting a multi-port testing device and a multi-port device.

Background technique

As integrated circuit technology improves and performance requirements increase, the use of multi-port devices is becoming more common. In order to ensure the normal operation of the product, it is necessary to test the RF characteristics of the multi-port device such as transmission, reflection, and isolation. It is usually necessary to use a vector network analyzer to measure the characteristics of the device. Early vector network analyzers generally only have two test ports. In order to measure multi-port devices, it is necessary to change the test multiple times between each port of the device Cables and terminations are matched to loads until all ports are measured. In order to improve the test efficiency and test the characteristics of multi-port devices at the same time, the 2 ports of the vector network analyzer are usually expanded to 4, 6, 8 or 12 ports by using a multi-port test device. During the testing process of the multi-port test device, due to the circuit design principle and the error model correction method of the multi-port test device, only the selected ports are tested and calibrated during the actual test, while the unselected ports are not. Test and Calibration. Because the characteristic parameters are the data measured under the condition that all ports are matched without reflection, the unselected ports on the multi-port device under test must also be connected with matched loads. In the prior art, an external cable is usually used to connect the matching load to the unselected port of the device under test. Due to the relatively long transmission distance of the external cable, there is electromagnetic interference in the test of the selected port, and the test curve fluctuates, which affects the test. the accuracy of the results.

Utility model content

The purpose of this utility model is to provide a switch device for connecting a multi-port test device and a multi-port device, which will match the load on the circuit board in the switch device, and realize the corresponding port of the multi-port device and the multi-port test device by switching the switch Or match the load with direct signal connection, this device can eliminate the fluctuation phenomenon of the test curve, and the index curves such as insertion loss and return loss of the test multi-port device will be smoother, truly reflect the characteristics of the device, and improve the accuracy of the test results.

The purpose of this utility model is to adopt the following technical solutions to achieve:

A switch device for connecting a multi-port test device and a multi-port device, wherein a circuit board is arranged in the switch device, a switch control circuit is provided on the circuit board, and the switch control circuit is provided with: The test end that is electrically connected to the multi-port device to be tested; the first connection end that is used to electrically connect the multi-port test device; the second connection end that is used to electrically connect the matching load, and the matching load is arranged on the circuit board; A toggle switch for switching the connection state between the test terminal and the first connection terminal or the second connection terminal, the switch has a control terminal, and the control terminal makes the switch operate based on the external command received by the switch control circuit, when the switch When connecting the test end to the first connection end, the corresponding port of the multi-port device is connected to the multi-port test device, and when the switching switch connects the test end to the second connection end, the corresponding port of the multi-port device is connected to the matching load.

Working principle of the present utility model: when testing a multi-port device, the software in the vector network analyzer connected with the multi-port test device will automatically control the number of test ports connected to the multi-port test device, and the A switch device is set between the device and the multi-port device, and the switch receiving control end acts based on the external command received by the switch control circuit. When the test port on the multi-port device is selected, the switch connects the test end to the first connection end , the test port on the multi-port device is connected to the multi-port test device signal; when the test port on the multi-port device is not selected, the switch connects the test port to the second connection port, and the test port on the multi-port device is connected to the matching Load connection, in the process of testing the characteristics of multi-port devices, the unselected ports on the multi-port device to be tested are directly connected to the matching load set on the circuit board through the switch, and there is no need to connect the matching load to the On the unselected port, it avoids the electromagnetic interference generated by the connecting cable during the transmission process and then causes the fluctuation of the test curve. After setting the switch device between the multi-port device and the multi-port test device, the insertion loss of the multi-port device is tested. Index curves such as return loss will be smoother and truly reflect the characteristics of the device, ultimately improving the accuracy of test results.

Due to the adoption of the above technical scheme, the utility model has the following advantages: it sets the matching load on the circuit board in the switch device, and realizes the direct signal communication between the corresponding port of the multi-port device and the multi-port testing device or the matching load by switching the switch. The device can eliminate the fluctuation phenomenon of the test curve, and the index curves such as insertion loss and return loss of the test multi-port device will be smoother, truly reflect the characteristics of the device, and improve the accuracy of the test results.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the schematic circuit diagram of the utility model.

detailed description

In order to make the technical means, creative features, purpose and effect of the utility model realized clearer and easier to understand, the utility model will be further elaborated below in conjunction with the accompanying drawings and specific implementation methods:

As shown in Figure 1, a switch device for connecting a multi-port test device and a multi-port device, wherein a circuit board is arranged in the switch device, a switch control circuit is provided on the circuit board, and the switch control circuit is set There are: a test terminal for electrically connecting with the multiport device to be tested; a first connection terminal for electrically connecting with the multiport test device; a second connection terminal for electrically connecting with a matching load, and the matching load is set On the circuit board; a switch for switching the connected state between the test terminal and the first connection terminal or the second connection terminal, the switch has a control terminal, and the control terminal makes the switch based on the external command received by the switch control circuit Switching action, when the switch connects the test end to the first connection end, the corresponding port of the multi-port device is connected to the multi-port test device signal; when the switch connects the test end to the second connection end, the corresponding port of the multi-port device Connected to a matching load, which is a 75Ω resistor.

Working principle of the present utility model: when testing a multi-port device, the software in the vector network analyzer connected with the multi-port test device can automatically control the number of test ports connected to the multi-port test device, and the switch device of the multi-port device, the switch receiving control end acts based on the external command received by the switch control circuit, when the test port on the multi-port device is selected, the switch connects the test end with the first connection end, and the multi-port The test port on the device is in signal communication with the multi-port test device; when the test port on the multi-port device is not selected, the switch connects the test port to the second connection end, and the test port on the multi-port device is connected to the matching load, In the process of testing the characteristics of the multi-port device, the unselected ports on the multi-port device to be tested are directly connected to the matching load set on the circuit board through the switch, and there is no need to connect the matching load to the unselected port through an external cable. On the port, avoid the electromagnetic interference generated by the connecting cable during the transmission process and cause the fluctuation of the test curve. After setting the switch device between the multi-port device and the multi-port test device, test the insertion loss and return loss of the multi-port device. The index curve will be smoother and truly reflect the characteristics of the device, and ultimately improve the accuracy of the test results.

Further, the switch is a single-pole double-throw radio frequency switch, and the electronically controlled single-pole double-throw radio frequency switch has long switching life, good repeatability, and fast switching speed.

Further, the specific implementation method for the control terminal to make the switch operate based on the external command received by the switch control circuit is: a button is set on the switch control circuit, and the switch control circuit receives the operation state of the button to make the switch operate, according to When the test port on the multi-port device is selected or not selected, the gating function of the switching switch is realized through the button on the switch control circuit.

The switch control circuit in the above scheme can also be composed of a radio frequency switch chip and its peripheral circuits. When the control levels received by the radio frequency switch chip are different, different control signals are given to the control end of the switch, and then the switch is activated to operate between the two. Switching between states, where the input control level signal is issued by the multi-port test set.

As shown in Figure 2, the utility model is divided into a power supply part, a chip part, and a control part, wherein the power supply part provides power for the switchgear, and the power supply part is connected with a filter capacitor, an EMI electromagnetic anti-interference filter and a voltage regulator. After the voltage is processed by the power supply part, 3.3V stable DC power is provided to the switching device. The chip part is the switch operation circuit. The chip part includes the test terminal, the first connection terminal, the second connection terminal, the matching load and the switch on the circuit board. The test terminal is used for electrical connection with the multi-port device to be tested, the first connection terminal is used for electrical connection with the multi-port test device, the second connection terminal is used for connecting with the matching load arranged on the circuit board, and the switch is used for switching The test terminal is connected to the first connection terminal or the second connection terminal. The control part realizes the gating function of the switch. The control part includes the control terminal. The connection ends are connected, so that the corresponding port of the multi-port device is connected with the multi-port test device or the matching load. Specifically, when the test port on the multi-port device is selected, the control terminal C1 inputs a low level, and the control terminal C2 inputs a high level. The switch connects the test end to the first connection end, and the test port on the multi-port device is connected to the multi-port test device signal; when the test port on the multi-port device is not selected, the control terminal C1 inputs a high level, and the control terminal C2 Input low level, the switch connects the test terminal to the second connection terminal, the test port on the multi-port device is connected to the matching load, during the characteristic test of the multi-port device, the unselected test port is directly matched with the circuit board The load is connected, no external cable is needed to connect the matching load to the test terminal, which effectively avoids the electromagnetic interference that occurs during the transmission of the cable and the influence on the characteristic test of the device under test.

Although the embodiment of the present utility model has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present utility model, and for those familiar with the art, Further modifications can be readily effected, so the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (3)

1. connect a switchgear for multiport proving installation and multiport device, it is characterized in that, be provided with wiring board in described switchgear, described wiring board is provided with ON-OFF control circuit, described ON-OFF control circuit is provided with:

In order to the test lead be electrically connected with multiport device to be measured;

In order to the first link be electrically connected with multiport proving installation;

In order to the second link be electrically connected with matched load, described matched load is arranged in the circuit board;

In order to the change-over switch of switch test end and the first link or the second link connected state, described change-over switch has a control end, described control end makes change-over switch action based on the external command that ON-OFF control circuit receives, when test lead is communicated with the first link by change-over switch, the corresponding port of multiport device and multiport proving installation signal communication, when test lead is communicated with the second link by change-over switch, the corresponding port of multiport device is communicated with matched load.

2. the switchgear of connection multiport proving installation according to claim 1 and multiport device, is characterized in that, described change-over switch is SPDT radio-frequency (RF) switch.

3. the switchgear of connection multiport proving installation according to claim 1 and 2 and multiport device, it is characterized in that, described control end makes the specific implementation of change-over switch action be based on the external command that ON-OFF control circuit receives: in ON-OFF control circuit, arrange a button, and the mode of operation that described ON-OFF control circuit receives button makes change-over switch action.