CN118625241B - An electronic calibration component and a port calibration method for a vector network analyzer - Google Patents
An electronic calibration component and a port calibration method for a vector network analyzer Download PDFInfo
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- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
An electronic calibration part and a calibration method of a vector network analyzer are provided, wherein the electronic calibration part comprises at least three interfaces connected with calibrated ports of the vector network analyzer, a load calibration unit, a control processing unit, a switch connection unit and a data communication unit. The load calibration unit performs load calibration on the calibrated port, the control processing unit responds to the output of a corresponding control instruction based on the calibrated port and the calibration mode designated by a user, the switch connection unit responds to the control instruction and is connected with the load calibration unit and the interfaces or any two interfaces, and the data communication unit is used for data transmission between the vector network analyzer and the control processing unit. The external ports of the network analyzer are calibrated through the interfaces of the electronic calibration piece, so that the calibration ports of the vector network analyzer can be calibrated in a time-sharing asynchronous mode, and the interfaces of the electronic calibration piece can be used as the calibration ports of the vector network analyzer to expand the number of the external ports.
Description
Technical Field
The application relates to the technical field of communication test instruments and meters, in particular to an electronic calibration piece and a port calibration method of a vector network analyzer.
Background
The vector network analyzer is used as a universal S parameter testing instrument, and is widely applied to various scientific research institutions, laboratories and production lines for S parameter measurement, such as various antenna tests, cavity filter tests, dielectric filter tests, circulator tests, coupler tests, splitter combiner tests and the like. Before the network analyzer is used for measurement, the test equipment and the equipment to be tested are required to be physically connected (a calibration piece or a measured piece is connected), and the calibration is required to be performed respectively (mainly because of some errors existing in the vector network analyzer, and the calibration is required to ensure the measurement accuracy). The measurement errors of the vector network analyzer comprise directivity errors, source matching errors, reflection tracking errors, LOAD matching errors and transmission tracking errors, wherein the directivity errors, the source matching errors and the reflection tracking errors are single port errors of the network analyzer, and are determined by directly connecting different types of standard test pieces (OPEN standard pieces, SHORTT standard pieces and LOAD standard pieces) respectively, and the LOAD matching errors and the transmission tracking errors are determined by external direct lines (THRU standard pieces). Thus, when calibrating a multiport vector network analyzer, a minimum set of OPEN, SHORTT, LOAD and THRU standards is required for calibration. At present, the direct calibration among any ports of the vector network analyzer is realized by adopting a mode of interpolating and calibrating an electronic calibration piece, and the calibration mode usually ignores the respective differences among different ports and also causes measurement errors.
Disclosure of Invention
The invention mainly solves the technical problem of how to calibrate a plurality of external ports of a vector network analyzer by using an electronic calibration piece.
According to a first aspect, in one embodiment there is provided an electronic calibrator for calibrating a vector network analyzer, the electronic calibrator comprising:
At least three interfaces for connecting to calibrated ports of the vector network analyzer at least at the time of calibration;
Load calibration units with the same number as the interfaces are used for carrying out load calibration on the calibrated ports;
A control processing unit for outputting corresponding control instructions in response to a calibrated port specified based on a user and a calibration mode including a load calibration mode and a pass-through calibration mode;
the switch connection unit responds to the control instruction to control the corresponding switch to switch, and when the control instruction is a first instruction for carrying out load calibration on a calibrated port appointed by a user, an interface connected with the calibrated port appointed by the user and a load calibration unit corresponding to the interface are connected so as to carry out load calibration on the calibrated port appointed by the user;
the data communication unit is used for being electrically connected with the calibrated vector network analyzer, and is also electrically connected with the control processing unit and used for carrying out data transmission between the calibrated vector network analyzer and the control processing unit.
In an embodiment, the control processing unit is further configured to calculate a vector characteristic parameter of the designated port in the designated calibration mode, and the data communication unit is further configured to transmit the vector characteristic parameter of the designated port calculated by the control processing unit to the calibrated vector network analyzer, so that the calibrated vector network analyzer updates its parameter when performing vector characteristic measurement on the network under test.
In one embodiment, the electronic calibration further includes a storage unit, and the control processing unit stores the calculated vector characteristic parameter of the designated port in the storage unit.
In an embodiment, the electronic calibration piece further includes an attenuator, the attenuator is configured to be connected in series to a path where any two interfaces are communicated through the switch connection unit, the control processing unit calculates vector characteristic parameters of the designated port in a through calibration mode with attenuation, compares the vector characteristic parameters in the through calibration mode with attenuation with vector characteristic parameters in a through calibration mode without attenuation, and determines whether the electronic calibration piece has completed calibration of the vector network analyzer according to a comparison result.
In an embodiment, the data communication unit is a USB module, and the USB module further provides electrical energy for the electronic calibration member when electrically connected to the calibrated vector network analyzer.
In an embodiment, the electronic calibration unit further includes a temperature control unit for adjusting the operating temperature of the load calibration unit to be within a preset temperature threshold range.
In one embodiment, the switch is a radio frequency switch.
In an embodiment, the LOAD calibration unit comprises at least one of a test SHORT circuit, a test OPEN circuit and a test LOAD circuit, and the LOAD calibration mode is used for connecting the test SHORT circuit, the test OPEN circuit or/and the test LOAD circuit to the interface to verify the interface.
According to a second aspect, in one embodiment, there is provided a port calibration method of a vector network analyzer, the vector network analyzer being calibrated by an electronic calibration piece, the electronic calibration piece including at least three interfaces, load calibration units consistent in number with the interfaces, a control processing unit, and a switch connection unit, the port calibration method including:
The electronic calibration piece receives a command of a calibrated port and a calibration mode appointed by a user through a calibration display interface of the vector network analyzer, wherein the calibration mode comprises a load calibration mode and a direct calibration mode;
Judging whether the interface of the electronic calibration piece is connected with a designated calibrated port, if so, sending calibration information to a control processing unit of the electronic calibration piece, wherein the calibration information comprises the calibrated port designated by a user and a calibration mode;
the control processing unit responds to the calibrated port and the calibration mode designated by the user and outputs corresponding control instructions;
The switch connection unit responds to the control instruction and controls the corresponding switch to switch so as to connect an interface connected with the calibrated port appointed by the user and a load calibration unit corresponding to the interface when the control instruction is a first instruction for carrying out load calibration on the calibrated port appointed by the user so as to carry out load calibration on the calibrated port appointed by the user;
Calculating a first vector characteristic parameter measured by the vector network analyzer through the electronic calibration piece on a specified calibrated port in a specified calibration mode;
and updating the self parameters corresponding to the parameter types of the first vector parameters recorded by the vector network analyzer by adopting the first vector characteristic parameters, wherein the self parameters are parameters related to the self characteristics of the vector network analyzer, which are used by the vector network analyzer when the vector network analyzer performs vector characteristic measurement on the network to be measured.
In an embodiment, the electronic calibration piece further includes an attenuator configured to be connected in series to a path through which any two interfaces communicate through a switch connection unit, and the port calibration method further includes:
After the calibration of the appointed calibrated port in the appointed calibration mode is completed, the control processing unit outputs a confirmation calibration instruction;
the switch connection unit responds to the confirmation calibration instruction, and connects the attenuator in series into a passage communicated with two interfaces connected with two calibrated ports designated by a user;
And calculating vector characteristic parameters of the designated port in the through calibration mode with attenuation, comparing the vector characteristic parameters in the through calibration mode with attenuation with the vector characteristic parameters in the through calibration mode without attenuation, and judging whether the electronic calibration piece has completed the calibration of the vector network analyzer according to the comparison result.
When the electronic calibration piece of the embodiment calibrates a plurality of external ports of the vector network analyzer, each external port of the vector network analyzer can be calibrated in a time-sharing asynchronous mode, and the number of the external ports of the vector network analyzer is expanded.
Drawings
FIG. 1 is a block diagram of an electronic calibration in one embodiment;
FIG. 2 is a schematic diagram showing the structural connection of a load calibration unit according to one embodiment;
FIG. 3 is a flow chart of a port calibration method according to an embodiment;
FIG. 4 is a schematic diagram showing the structural connection of a four-port electronic calibration device according to one embodiment;
FIG. 5 is a schematic diagram showing the structural connection of a switch connection unit according to one embodiment;
FIG. 6 is a schematic diagram of circuit connections of a switch connection unit in one embodiment;
Fig. 7 is a schematic diagram of an electronic device arrangement of a radio frequency switch circuit board in an embodiment.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
In the embodiment of the application, the electronic calibration piece comprises a plurality of interfaces, when a plurality of external ports of the vector network analyzer are calibrated, each external port is connected with one interface of the electronic calibration piece, and each external port of the vector network analyzer can be calibrated in a time-sharing asynchronous mode by connecting the interface of the electronic calibration piece with the load calibration unit, so that the external ports of the vector network analyzer do not need to be manually and sequentially connected with the electronic standard piece for calibration, and the calibration efficiency and the calibration precision of the vector network analysis are improved. Furthermore, the interfaces of the electronic calibration piece can also be used as external ports of the vector network analyzer so as to expand the number of the external ports of the vector network analyzer.
Embodiment one:
Referring to fig. 1, a block diagram of an electronic calibration unit 1 according to an embodiment is shown, and the electronic calibration unit 1 is used for calibrating a vector network analyzer 2, and includes at least three interfaces 11, a load calibration unit 12 consistent with the number of the interfaces 11, a control processing unit 13, a switch connection unit 14, and a data communication unit 15. Each interface 11 is at least used for connecting a calibrated port of the vector network analyzer 2 during calibration, the load calibration unit 12 is used for carrying out load calibration on the calibrated port, and the control processing unit 13 is used for responding to a corresponding control instruction based on the calibrated port specified by a user and a calibration mode, wherein the calibration mode comprises a load calibration mode and a through calibration mode. The switch connection unit 14 includes a switch matrix composed of at least four switches, and is responsive to a control instruction to control the respective switches to switch, and when the control instruction is a first instruction to load calibrate a user-specified calibrated port, connects the interface 11 connected to the user-specified calibrated port and the load calibration unit 12 corresponding to the interface 11 so as to load calibrate the user-specified calibrated port. When the control instruction is a second instruction to perform the through calibration on the two calibrated ports specified by the user, the two interfaces 11 connected to the two calibrated ports specified by the user are communicated so as to perform the through calibration on the two calibrated ports specified by the user. The data communication unit 15 is electrically connected to the calibrated vector network analyzer 2, and the data communication unit 15 is also electrically connected to the control processing unit 13, so as to perform data transmission between the calibrated vector network analyzer 2 and the control processing unit 13.
In one embodiment, the load calibration mode includes, in addition to single port calibration of the external port (port to be calibrated) of the vector network analyzer 2, single port calibration of the interface 11 when the interface 11 of the electronic calibration unit 1 is used as the extended external interface (port to be calibrated) of the vector network analyzer 2. In one embodiment, the through calibration mode is to directly connect the external ports of the vector network analyzer 2 through the electronic calibration member 1, so as to directly calibrate the two directly connected external ports.
In one embodiment, the control processing unit 13 is further configured to calculate the vector characteristic parameter of the designated port in the designated calibration mode, and the data communication unit 15 further transmits the vector characteristic parameter of the designated port calculated by the control processing unit 13 to the calibrated vector network analyzer 2, so that the calibrated vector network analyzer 2 updates its parameter when performing vector characteristic measurement on the network under test.
In one embodiment, the electronic calibration 1 further includes a storage unit 16, and the control processing unit 13 stores the calculated vector characteristic parameters of the designated port (used as an external port for vector network analysis) in the storage unit 16. In an embodiment, the switch connection unit 14 includes a switch matrix composed of at least six switches, the electronic calibration unit 1 further includes an attenuator 17, the attenuator 17 is configured to be connected in series to a path that any two interfaces 11 communicate through the switch connection unit 14, the control processing unit 13 calculates vector characteristic parameters of a designated port in the through calibration mode with attenuation, compares the vector characteristic parameters in the through calibration mode with attenuation with vector characteristic parameters in the through calibration mode without attenuation, and determines whether the electronic calibration unit has completed calibration of the vector network analyzer 2 according to the comparison result.
In one embodiment, the data communication unit 15 is a USB module, and the USB module further provides power to the electronic calibration unit 1 when electrically connected to the vector network analyzer 2 to be calibrated. In one embodiment, the USB module includes a type interface. In one embodiment, the electronic calibration unit 1 further comprises a temperature control unit for adjusting the operating temperature of the load calibration unit 12 to be within a preset temperature threshold. In one embodiment, the switch of the switch connection unit 14 is a radio frequency switch.
In an embodiment, the different interfaces of the electronic calibration piece are further used for respectively connecting the piece to be tested and the vector network analyzer, and the direct connection between the external port of the vector network analyzer and the piece to be tested is established so as to expand the number of the external ports of the vector network analyzer.
Referring to fig. 2, in an embodiment, the LOAD calibration unit 12 includes at least one of a test SHORT circuit 21, a test OPEN circuit 22 and a test LOAD circuit 23, and the test SHORT circuit 21, the test OPEN circuit 22 and the test LOAD circuit 23 are electrically connected to the interface 11 through a connection switch circuit 24. The connection switch circuit 24 connects one of the test SHORT circuit 21, the test OPEN circuit 22, and the test LOAD circuit 23 to the interface 11 in response to a control electric signal issued by the control processing unit 13 in the LOAD calibration mode, for connecting the test SHORT circuit 21, the test OPEN circuit 22, or the test LOAD circuit 23 to the interface to verify the interface 11.
Referring to fig. 3, a flow chart of a port calibration method in an embodiment is shown, and the method is used for calibrating a vector network analyzer through an electronic calibration component, wherein the electronic calibration component includes at least three interfaces, a load calibration unit with the same number as the interfaces, a control processing unit and a switch connection unit, and the port calibration method includes:
Step 101, presetting a connection interface and a calibration mode.
The electronic calibration component receives instructions of a calibrated port and a calibration mode designated by a user through a calibration display interface of the vector network analyzer, wherein the calibration mode comprises a load calibration mode and a through calibration mode.
Step 102, checking the interface and obtaining calibration information.
And judging whether the interface of the electronic calibration piece is connected with the designated calibrated port, and if so, sending calibration information to the control processing unit of the electronic calibration piece, wherein the calibration information comprises the calibrated port designated by the user and a calibration mode.
And 103, outputting a control instruction.
The control processing unit responds to the calibrated port and the calibration mode designated by the user and outputs corresponding control instructions.
Step 104, executing the control instruction.
The switch connection unit responds to the control instruction and controls the corresponding switch to switch, so that when the control instruction is a first instruction for carrying out load calibration on the calibrated port appointed by the user, an interface connected with the calibrated port appointed by the user and a load calibration unit corresponding to the interface are connected, and load calibration is carried out on the calibrated port appointed by the user. When the control instruction is a second instruction for performing the through calibration on the two calibrated ports specified by the user, the two interfaces connected with the two calibrated ports specified by the user are communicated so as to perform the through calibration on the two calibrated ports specified by the user.
Step 105, checking.
A first vector characteristic parameter of the vector network analyzer measured in a specified calibration mode for a specified calibrated port through an electronic calibration piece is calculated.
And step 106, updating the interface parameters.
And updating the self parameters corresponding to the parameter types of the first vector parameters recorded by the vector network analyzer by adopting the first vector characteristic parameters, wherein the self parameters are parameters related to the self characteristics of the vector network analyzer, which are used by the vector network analyzer when the vector network analyzer measures the vector characteristics of the network to be measured.
In one embodiment, the electronic calibration piece further includes an attenuator configured to be connected in series into a path in which any two interfaces communicate through the switch connection unit, and the port calibration method further includes:
Step 107, an attenuator is accessed.
After the calibration of the specified calibrated port in the specified calibration mode is performed, the control processing unit outputs a confirmation calibration instruction, and the switch connection unit connects the attenuator in series into a path communicated with two interfaces connected with the two calibrated ports specified by the user in response to the confirmation calibration instruction.
Step 108, obtaining the straight-through calibration parameters.
And calculating vector characteristic parameters of the designated port in the through calibration mode with attenuation, comparing the vector characteristic parameters in the through calibration mode with attenuation with the vector characteristic parameters in the through calibration mode without attenuation, and judging whether the electronic calibration piece has completed the calibration of the vector network analyzer according to the comparison result.
The electronic calibration piece disclosed in the embodiment comprises at least three interfaces connected with the calibrated ports of the vector network analyzer, a load calibration unit, a control processing unit, a switch connection unit and a data communication unit. The load calibration unit performs load calibration on the calibrated port, the control processing unit responds to the output of a corresponding control instruction based on the calibrated port and the calibration mode designated by a user, the switch connection unit responds to the control instruction and is connected with the load calibration unit and the interfaces or any two interfaces, and the data communication unit is used for data transmission between the vector network analyzer and the control processing unit. The external ports of the network analyzer are calibrated through the interfaces of the electronic calibration piece, so that the calibration ports of the vector network analyzer can be calibrated in a time-sharing asynchronous mode, and the interfaces of the electronic calibration piece can be used as the calibration ports of the vector network analyzer to expand the number of the external ports.
Embodiment two:
Referring to fig. 4, a schematic structural connection diagram of a four-port electronic calibration device in an embodiment is shown, and the four-port electronic calibration device 100 is used as an electronic calibration member for calibrating the vector network analyzer 2, and includes a housing, four interfaces (a first interface 31, a second interface 32, a third interface 33, and a fourth interface 34) disposed in the housing, four load calibration units (a first load calibration unit 35, a second load calibration unit 36, a third load calibration unit 37, and a fourth load calibration unit 38), a control processing unit 13, a switch connection unit 14, and a data communication unit 15. In one embodiment, four interfaces, four load calibration units and switch connection unit 14 are provided on the radio frequency switch circuit board 200. Each interface is connected to a load calibration unit, i.e. the first interface 31 is connected to a first load calibration unit 35, the second interface 32 is connected to a second load calibration unit 36, the third interface 33 is connected to a third load calibration unit 37 and the fourth interface 34 is connected to a fourth load calibration unit 38. Each interface is at least used for connecting a calibrated port of the vector network analyzer 2 during calibration, each load calibration unit is used for carrying out load calibration on the calibrated port, and the control processing unit 13 is used for responding to corresponding control instructions based on the calibrated port specified by a user and a calibration mode, wherein the calibration mode comprises a load calibration mode and a through calibration mode. The switch connection unit 14 is responsive to the control instruction to control the respective switches to switch, and when the control instruction is a first instruction to load calibrate the user-specified calibrated port, connects the interface connected to the user-specified calibrated port and the load calibration unit corresponding to the interface so as to load calibrate the user-specified calibrated port. When the control instruction is a second instruction for performing the through calibration on the two calibrated ports specified by the user, the two interfaces connected with the two calibrated ports specified by the user are communicated so as to perform the through calibration on the two calibrated ports specified by the user. The data communication unit 15 is electrically connected to the calibrated vector network analyzer 2, and the data communication unit 15 is also electrically connected to the control processing unit 13, so as to perform data transmission between the calibrated vector network analyzer 2 and the control processing unit 13. In an embodiment, the four-port electronic calibration device is further configured to connect the vector network analyzer 2 and the part to be tested through at least two interfaces, respectively, so as to monitor the part to be tested by the vector network analyzer 2. In one embodiment, the control processing unit 15 is a single-chip Microcomputer (MCU). In one embodiment, the data communication unit 15 is a USB interface. In one embodiment, the four-port electronic calibration device obtains the working power through the USB interface.
Referring to fig. 5, in an embodiment, the switch connection unit is a switch matrix formed by a first rf switch 41, a second rf switch 42, a third rf switch 43, a fourth rf switch 44, a fifth rf switch 45 and a sixth rf switch 46, the first load calibration unit 35 is connected to the first interface 31, the second load calibration unit 36 is connected to the second interface 32, the third load calibration unit 37 is connected to the third interface 33, and the fourth load calibration unit 38 is connected to the fourth interface 34. In an embodiment, the four-port electronic calibration device further includes an attenuator 17, where the attenuator 17 is configured to be connected in series to a path that any two interfaces communicate through the switch connection unit 14, and the control processing unit 13 calculates a vector characteristic parameter of the designated port in the through calibration mode with attenuation, compares the vector characteristic parameter in the through calibration mode with attenuation with the vector characteristic parameter in the through calibration mode without attenuation, and determines whether the electronic calibration piece has completed calibration of the vector network analyzer according to the comparison result.
In one embodiment, the first rf switch 41 is connected to the first interface 31, the fifth rf switch 45, the sixth rf switch 46 and the third rf switch 43, and the first rf switch 41 is used to connect or disconnect the third rf switch 43 to or from the fifth rf switch 45, the sixth rf switch 46 and the first interface 31, respectively. The second rf switch 42 is connected to the third interface 33, the fourth rf switch 44, the fifth rf switch 45 and the sixth rf switch 46, and the second rf switch 42 is used for connecting or disconnecting the fourth rf switch 44 to the third interface 33, the fifth rf switch 45 and the sixth rf switch 46. The third rf switch 43 is connected to the first rf switch 41, the fourth rf switch 44 and the attenuator 17, respectively, the fourth rf switch 44 is connected to the third rf switch 43, the second rf switch 42 and the attenuator 17, respectively, and the third rf switch 43 and the fourth rf switch 44 are used to connect the attenuator 17 between the first rf switch 41 and the second rf switch 42 or electrically isolate the attenuator. The fifth radio frequency switch 45 is connected to the second interface 32, the first radio frequency switch 41 and the second radio frequency switch 42, and the fifth radio frequency switch 45 is used for connecting or disconnecting the second interface 32 to the first radio frequency switch 41 and the second radio frequency switch 42. The sixth rf switch 46 is connected to the fourth interface 34, the second rf switch 42, and the first rf switch 41, and the sixth rf switch 46 is used for connecting or disconnecting the fourth interface 34 to the second rf switch 42 and the first rf switch 41.
Referring to fig. 6, a schematic circuit connection diagram of a switch connection unit in an embodiment is shown, in an embodiment, the first rf switch 41 and the second rf switch 42 are single pole multi-throw rf switches (SP 4T) respectively including a movable terminal connection terminal and three stationary terminal connection terminals. The third rf switch 43, the fourth rf switch 44, the fifth rf switch 45 and the sixth rf switch 46 are single pole double throw rf Switches (SPDT) and each include a movable terminal connection and two stationary terminal connections. The SP4T is a quarter switch, and includes a common port (movable end connection end), four conductive ports (non-movable end connection end), where the common port can be conductive with any one of the conductive ports, and the four conductive ports cannot be conductive with each other. The SPDT is a one-to-two switch comprising a common port (movable end connection), two conductive ports (stationary end connection), the common port being capable of being electrically connected to any one of the conductive ports, the two conductive ports being non-electrically connected to each other.
The movable end connection end of the first radio frequency switch 41 is connected with the movable end connection end of the third radio frequency switch 43, and the three fixed end connection ends of the first radio frequency switch 41 are respectively connected with the first interface, one fixed end connection end of the fifth radio frequency switch 45 and one fixed end connection end of the sixth radio frequency switch 46. The movable end connection end of the second rf switch 42 is connected to the movable end connection end of the fourth rf switch 44, and the three stationary end connection ends of the second rf switch 42 are connected to the third interface, one stationary end connection end of the fifth rf switch 45, and one stationary end connection end of the sixth rf switch 46, respectively. One stationary terminal of the third rf switch 43 is connected to one stationary terminal of the fourth rf switch 44. The movable end connection end of the fifth radio frequency switch 45 is connected with the second interface, and two fixed ends of the fifth radio frequency switch 45 are respectively connected with one fixed end connection end of the first radio frequency switch 41 and one fixed end connection end of the second radio frequency switch 42. The movable end connection end of the sixth rf switch 46 is connected to the fourth interface, and the two stationary ends of the sixth rf switch 46 are respectively connected to one stationary end connection end of the first rf switch 41 and one stationary end connection end of the second rf switch 42.
In one embodiment, the attenuator 17 (ATT) is connected to one stationary terminal of the third rf switch 43 and one stationary terminal of the fourth rf switch 44, respectively. In one embodiment, the attenuation of the attenuator 17 is 5dB, 10dB, 20dB, or 30dB.
As shown in fig. 2, the first LOAD calibration unit, the second LOAD calibration unit, the third LOAD calibration unit, and the fourth LOAD calibration unit include a connection switch circuit 24 and a test SHORT circuit 21, a test OPEN circuit 22, and a test LOAD circuit 23, respectively, and the test SHORT circuit 21, the test OPEN circuit 22, and the test LOAD circuit 23 are connected to the connection switch circuit 24, respectively. Wherein OPEN is a radio frequency microstrip line direct OPEN circuit (test OPEN circuit), SHORT (test SHORT circuit) is a radio frequency microstrip line direct SHORT circuit to ground, and LOAD (test LOAD circuit) is a 50Ω LOAD constitution. In one embodiment, as shown in fig. 6, the connection switch circuit 24 is a single-pole multi-throw radio frequency switch (SP 4T), and includes a movable end connection end and four fixed end connection ends, where the movable end connection end of the single-pole multi-throw radio frequency switch of the switch circuit 24 is connected to an interface of the four-port electronic calibration device, and the four fixed end connection ends are respectively connected to the test SHORT circuit 21, the test OPEN circuit 22, the test LOAD circuit 23, and the switch connection unit. In one embodiment, the test LOAD circuit is a 50Ω LOAD. In one embodiment, the test SHORT circuit is a direct SHORT of the rf microstrip line to ground. In one embodiment, the test OPEN circuit rf microstrip line is directly OPEN.
In one embodiment, the four-port electronic calibration device may be configured to connect any one of the interfaces connected to the vector network analyzer to a test SHORT circuit, a test OPEN circuit, or a test LOAD circuit, so as to implement pre-test verification of the vector network analyzer. The four-port electronic calibration device can realize physical straight-through of any two interfaces, so that the vector network analyzer can realize direct-connection verification of two interfaces to be tested besides independent verification of the interfaces to be tested (external interfaces), and in addition, the interfaces of the four-port electronic calibration device can also be used for external interfaces of vector network analysis to expand the number of the external interfaces of the vector network analysis. In an embodiment, at least two interfaces of the four-port electronic calibration device are respectively connected with an external interface of the vector network analysis and a piece to be tested, so as to realize free conversion of check sum measurement under the condition that the physical connection mode is not changed. In an embodiment, the attenuator with the preset attenuation amount can realize free loading and isolation through the conduction setting of the third radio frequency switch and the fourth radio frequency switch according to the test requirement.
As shown in fig. 4, in an embodiment, the four-port electronic calibration device further includes a temperature control unit 18 connected to the control processing unit 13, where the temperature control unit 18 includes a heating circuit and a temperature sensor, so as to keep the operating temperatures of the four load calibration units in the four-port electronic calibration device stable.
In an embodiment, the four-port electronic calibration device further comprises a memory unit connected to the control processing unit 10, and the parameter memory unit is configured to store electrical parameter data related to the testing and verification of the vector network analyzer 2, where the electrical parameter data includes S-parameter and attenuation parameter data of OPEN calibration, SHORTT calibration, LOAD calibration, and/or THRU calibration of each port.
The four-port electronic calibration device disclosed in the embodiment is used for verifying an external connection port of a vector network analyzer, and comprises a shell, four interfaces, four load calibration units, a control processing unit, a switch connection unit and a data communication unit. Each interface is at least for connecting to a calibrated port of the vector network analyzer. One for each interface to load calibrate the port being calibrated. The control processing unit is used for responding to the calibrated port and the calibration mode designated by the user and outputting corresponding control instructions. The switch connection unit responds to the control instruction to perform load calibration or through calibration on the calibrated port designated by the user. The data communication unit is used for carrying out data transmission between the vector network analyzer and the control processing unit. The external ports of the network analyzer are calibrated through the interfaces of the electronic calibration piece, so that the calibration ports of the vector network analyzer can be calibrated in a time-sharing asynchronous mode, and the interfaces of the electronic calibration piece can be used as the calibration ports of the vector network analyzer to expand the number of the external ports. Furthermore, when the device is used as an external port of the expansion of the vector network analyzer, the physical connection mode of the test interface of the vector network analyzer and the to-be-tested piece cannot be changed due to no plug operation in the process of checking and testing, so that the calibration error of the vector network analyzer caused by the difference of plug ports is greatly reduced.
Embodiment III:
Referring to fig. 7, a schematic diagram of an electronic device set up of a radio frequency switch circuit board in an embodiment is shown, and a control and power supply connection socket 50, at least one temperature sensor 51, a plurality of heating circuits 52, an attenuator 17, four load calibration units and a switch connection unit as described in the second embodiment are disposed on the radio frequency switch circuit board 200. The control and power supply connection socket 50 is used for connecting with a control processing unit of the four-port electronic calibration device through a connection flat cable. The four load calibration units are axisymmetrically arranged on the radio frequency switch circuit board 200, and are respectively and electrically connected with the interfaces of the four-port electronic calibration device through microstrip lines.
In one embodiment, the heating circuit 52 is heated by a heating resistor. In one embodiment, an even number of temperature sensors 51 are disposed on the rf switch circuit board 200, and are disposed on the rf switch circuit board 200 in a central symmetry manner. In one embodiment, the heating resistor is composed of 0402 resistor of 619 Ω, the power supply voltage is 5V, the heating power is 1.7W, when the power supply of the switch connection unit is provided by the USB interface of the vector network analyzer, the power supply capability is 5V and 500mA, the total is 2.5W (universal USB interface), and the remaining 0.8W is consumed by the power consumption devices such as the control processing unit (MCU) and the switch circuit. The power supply voltage of the heating resistor is controlled to be turned off by the MCU, the MCU reads the temperature at any time through the temperature sensor 51, a temperature interval (for example, 33 ℃ to 35 ℃) is set as the working temperature of the electronic calibration piece (a test SHORT circuit, a test OPEN circuit and a test LOAD circuit), and under the temperature condition, the electronic calibration piece has the highest precision. When the MCU reads that the working temperature of the switch connection unit is less than 33 ℃, heating is started, and when the working temperature of the switch connection unit is between 33 ℃ and 35 ℃, heating is stopped.
In one embodiment, the heating circuit 52 includes a plurality of heating resistors, which are uniformly tiled and arranged on the rf switch circuit board, so as to realize synchronous heating of the whole rf switch circuit board, so that the heating effect is more balanced, and the temperature stable state can be achieved in the shortest time.
In one embodiment, the MCU marks the temperature through the red and green indicator lights, when the temperature of the radio frequency switch circuit board is read to be less than 33 ℃, the MCU controls the red light to be turned on and the green light to be turned off, and when the temperature of the radio frequency switch circuit board is read to be between 33 and 35 ℃, the green light is turned on and the red light is turned off.
In one embodiment, a blocking capacitor 53 is disposed on the microstrip line connecting the load calibration unit and the interface, so as to protect the rf chip.
In one embodiment, the test OPEN circuit in the load calibration unit implements OPEN load by pin-floating. In one embodiment, the test LOAD circuit in the LOAD calibration unit is connected to 100 Ω of two 0201 packages through the radio frequency wiring end and connected in parallel to form 50Ω as a LOAD. The test SHORT circuit realizes SHORT load by punching GND through pins to ground.
In one embodiment, the six switches of the switch connection unit are electrically connected through microstrip lines. In one embodiment, the control processing unit of the four-port electronic calibration device is a single-chip Microcomputer (MCU). In one embodiment, the data communication unit 11 of the four-port electronic calibration device is a USB port.
In an embodiment, the attenuator is connected to the third rf switch 43 and the fourth rf switch 44 of the switch connection unit, respectively. In one embodiment, the attenuation of the attenuator is 5dB, 10dB, 20dB, or 30dB. In one embodiment, the fixed attenuator is an identification document, and the direct connection states between the ports are similar, except that the third rf switch 43 and the fourth rf switch 44 simultaneously conduct the path of the attenuator, and any two ports in the four-port electronic calibration device can directly switch on the path of the attenuator. In one embodiment, the S21 parameter of the turn-on attenuator path is also written into the memory of the memory cell when writing the calibrator parameter data. After the network is calibrated by using the electronic calibration piece, the S21 parameter of the attenuation path is measured again and compared with the S21 parameter stored in the memory, so that whether the four-port electronic calibration device has completed the correction of the network analyzer can be evaluated, and whether the correction is correct can be judged.
In one embodiment, the switch connection unit includes a first rf switch circuit 41, a second rf switch circuit 42, a third rf switch 43, a fourth rf switch 44, a fifth rf switch 45 and a sixth rf switch 46 electrically connected by microstrip lines.
In one embodiment, the housing 100 is a shielding case. In one embodiment, the attenuation circuit 17 is disposed in the middle of the rf switch circuit board 200.
The radio frequency switch circuit board disclosed in the embodiment is provided with a control and power supply connection socket, a temperature sensor, a heating circuit, an attenuator, four load calibration units and a switch connection unit. The control and power supply connection socket is used for being connected with the control processing unit of the four-port electronic calibration device through the connection flat cable. The temperature sensor is used for monitoring the working temperature of the load calibration unit. The heating circuit is used for heating the radio frequency switch circuit board. The four load calibration units are respectively and electrically connected with four interfaces of the four-port electronic calibration device, and each interface of the four-port electronic calibration device is at least used for connecting a calibrated port of the vector network analyzer when the vector network analyzer performs calibration. The switch connection unit is connected with each interface and is used for switching and connecting two interfaces respectively connected with the two calibrated ports. The temperature sensor and the heating circuit are arranged on the radio frequency switch circuit board, so that the working temperature range of the load calibration unit can be maintained, and the measurement accuracy of the vector network analyzer is further improved.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer-readable storage medium, which may include a read-only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to implement the functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (10)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467021A (en) * | 1993-05-24 | 1995-11-14 | Atn Microwave, Inc. | Calibration method and apparatus |
| CN1588114A (en) * | 2004-07-14 | 2005-03-02 | 上海电缆研究所 | Quick correcting method for multiple test port |
| CN114499706A (en) * | 2022-04-08 | 2022-05-13 | 深圳市鼎阳科技股份有限公司 | Electronic calibration system, automatic port identification method and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6853198B2 (en) * | 2002-11-14 | 2005-02-08 | Agilent Technologies, Inc. | Method and apparatus for performing multiport through-reflect-line calibration and measurement |
| CN102279376B (en) * | 2011-06-20 | 2014-06-11 | 南京航空航天大学 | Method for calibrating two-port vector network analyzer based on ten-error model |
| CN102981135B (en) * | 2012-11-13 | 2014-12-10 | 哈尔滨工业大学 | Twin port calibration method for nonlinearity vector network analyzer |
| CN103954926B (en) * | 2014-05-09 | 2017-01-18 | 中国电子科技集团公司第四十一研究所 | Vector network analyzer multi-port calibrating method capable of simplifying through connection |
| CN109001662B (en) * | 2018-06-08 | 2020-07-03 | 中国电子科技集团公司第四十一研究所 | Device and method for automatically recovering calibration data of electronic calibration piece |
| CN112051534B (en) * | 2020-08-31 | 2023-08-25 | 中电科思仪科技股份有限公司 | External device and method for improving measurement and calibration precision of microwave network |
| CN114137467A (en) * | 2021-12-02 | 2022-03-04 | 上海创远仪器技术股份有限公司 | System and method for realizing multiple communication connections for electronic calibration components |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467021A (en) * | 1993-05-24 | 1995-11-14 | Atn Microwave, Inc. | Calibration method and apparatus |
| CN1588114A (en) * | 2004-07-14 | 2005-03-02 | 上海电缆研究所 | Quick correcting method for multiple test port |
| CN114499706A (en) * | 2022-04-08 | 2022-05-13 | 深圳市鼎阳科技股份有限公司 | Electronic calibration system, automatic port identification method and storage medium |
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