Electronic calibration circuit and electronic calibration element

Abstract

The utility model discloses an electronic calibration circuit and electronic calibration piece. Electronic calibration circuit includes: at least two connection ports and with at least two single pole four throw switches of one to one corresponding of at least two connection ports, the radio frequency common end of single pole four throw switch is connected with corresponding connection port, and every radio frequency port of single pole four throw switch is connected with transmission standard or reflection standard, and the utility model discloses a switch unit with radio frequency port one to one corresponding, and the radio frequency common end open circuit when the switch unit is off. The utility model can reduce the complexity of electronic calibration circuit.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to an electronic calibration circuit and electronic calibration component. Background Technology

[0002] An Electronic Calibration Module (ECal) encapsulates a set of known, automatically switchable calibration standards, control circuits, and calibration data into a single small box, allowing a Vector Network Analyzer (VNA) to perform fully automated SOLT (Short, Open, Load, Thru) calibration from one port to multiple ports with just a "plug-in" operation.

[0003] Electronic calibration circuits are an important part of electronic calibration components. The single-pole multi-throw switches used in electronic calibration circuits are mainly single-pole double-throw switches (SPDT) and single-pole four-throw switches (SP4T). Other types of single-pole multi-throw switches (such as single-pole three-throw switches or single-pole five-throw switches) are not commonly used, and the asymmetrical number of ports will result in poor output amplitude and phase symmetry of each port.

[0004] The electronic calibration circuits in related technologies require the use of many single-pole double-throw switches and single-pole quad-throw switches to achieve multiple standards. The circuit structure is relatively complex, which makes control more difficult. Utility Model Content

[0005] This invention provides an electronic calibration circuit and electronic calibration components to reduce the complexity of electronic calibration circuits.

[0006] According to one aspect of the present invention, an electronic calibration circuit is provided, comprising: at least two connection ports and at least two single-pole four-throw switches corresponding one-to-one with the at least two connection ports;

[0007] The RF common terminal of the single-pole four-throw switch is connected to the corresponding connection port, and each RF port of the single-pole four-throw switch is connected to a transmission standard or a reflection standard; the single-pole four-throw switch includes a switching unit corresponding to each RF port, and the RF common terminal is opened when the switching unit is turned off.

[0008] Optionally, the common terminal of the switching unit is connected to the radio frequency common terminal, the first terminal of the switching unit is connected to the corresponding radio frequency port, and the second terminal of the switching unit is left floating.

[0009] Alternatively, the switching unit includes a first terminal and a second terminal, wherein the first terminal of the switching unit is connected to the corresponding radio frequency port, and the second terminal of the switching unit is connected to the radio frequency common terminal.

[0010] Optionally, each of the switching units corresponding to the radio frequency port will open the radio frequency common terminal when it is turned off.

[0011] Optionally, the number of the at least two single-pole four-throw switches is two; the at least two single-pole four-throw switches include a first single-pole four-throw switch and a second single-pole four-throw switch;

[0012] The first radio frequency port of the first single-pole four-throw switch is connected to the first load circuit, the second radio frequency port of the first single-pole four-throw switch is connected to the first end of the through circuit, the third radio frequency port of the first single-pole four-throw switch is connected to the first end of the attenuation circuit, and the fourth radio frequency port of the first single-pole four-throw switch is connected to the first short-circuit circuit.

[0013] The first RF port of the second single-pole four-throw switch is connected to the second load circuit, the second RF port of the second single-pole four-throw switch is connected to the second end of the attenuation circuit, the third RF port of the second single-pole four-throw switch is connected to the second end of the through circuit, and the fourth RF port of the second single-pole four-throw switch is connected to the second short-circuit circuit.

[0014] Optionally, the number of the at least two single-pole four-throw switches is four; the at least two single-pole four-throw switches include a first single-pole four-throw switch, a second single-pole four-throw switch, a third single-pole four-throw switch, and a fourth single-pole four-throw switch; the electronic calibration circuit also includes a first single-pole double-throw switch and a second single-pole double-throw switch;

[0015] The first radio frequency port of the first single-pole four-throw switch is connected to the first load circuit, the second radio frequency port of the first single-pole four-throw switch is connected to the first radio frequency port of the first single-pole double-throw switch, the third radio frequency port of the first single-pole four-throw switch is connected to the first end of the first through circuit, and the fourth radio frequency port of the first single-pole four-throw switch is connected to the first short-circuit circuit.

[0016] The first RF port of the second single-pole four-throw switch is connected to the second load circuit, the second RF port of the second single-pole four-throw switch is connected to the first end of the second through circuit, the third RF port of the second single-pole four-throw switch is connected to the first RF port of the second single-pole double-throw switch, and the fourth RF port of the second single-pole four-throw switch is connected to the second short-circuit circuit.

[0017] The first RF port of the third single-pole four-throw switch is connected to the third load circuit, the second RF port of the third single-pole four-throw switch is connected to the second end of the first through circuit, the third RF port of the third single-pole four-throw switch is connected to the second RF port of the first single-pole double-throw switch, and the fourth RF port of the third single-pole four-throw switch is connected to the third short-circuit circuit.

[0018] The first RF port of the fourth single-pole four-throw switch is connected to the fourth load circuit, the second RF port of the fourth single-pole four-throw switch is connected to the second RF port of the second single-pole double-throw switch, the third RF port of the fourth single-pole four-throw switch is connected to the second end of the second through circuit, and the fourth RF port of the fourth single-pole four-throw switch is connected to the fourth short-circuit circuit.

[0019] The common terminal of the first single-pole double-throw switch is connected to the first terminal of the third through circuit, and the common terminal of the second single-pole double-throw switch is connected to the second terminal of the third through circuit.

[0020] Optionally, the electronic calibration circuit further includes a control module;

[0021] The control module is connected to the at least two single-pole four-throw switches, and the control module is used to control the conduction state of the at least two single-pole four-throw switches.

[0022] Optionally, the control module includes at least two shutdown signal output units corresponding one-to-one with the at least two single-pole four-throw switches. The shutdown signal output units are electrically connected to the control terminals of the corresponding switch units in the single-pole four-throw switches. The shutdown signal output units are used to shut down the switch units in response to an open-circuit calibration signal.

[0023] Optionally, the control module is also used to supply power to the at least two single-pole four-throw switches.

[0024] Optionally, the electronic calibration circuit further includes a temperature control module, which is connected to the control module.

[0025] Optionally, the electronic calibration circuit further includes a communication and storage module, which is connected to the control module.

[0026] According to another aspect of the present invention, an electronic calibration component is provided, the electronic calibration component comprising the electronic calibration circuit described above.

[0027] The technical solution of this utility model embodiment employs an electronic calibration circuit including at least two connection ports and at least two single-pole four-throw switches corresponding to each of the at least two connection ports. The RF common terminal of each single-pole four-throw switch is connected to the corresponding connection port, and each RF port of the single-pole four-throw switch is connected to a transmission standard or a reflection standard. Each single-pole four-throw switch includes a switching unit corresponding to each RF port; when the switching unit is turned off, the RF common terminal is open. By using a single-pole four-throw switch where the switching unit opens the RF common terminal when turned off, one RF port used for connecting an open standard can be saved, thus enabling calibration of multiple standards with a smaller number of single-pole four-throw switches and reducing circuit complexity.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the circuit structure of an electronic calibration circuit provided for an embodiment of this utility model;

[0031] Figure 2 A schematic diagram of the circuit structure of another electronic calibration circuit provided in this embodiment of the present utility model;

[0032] Figure 3 A schematic diagram of the circuit structure of another electronic calibration circuit provided in this embodiment of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] Figure 1 A schematic diagram of the circuit structure of an electronic calibration circuit provided in an embodiment of this utility model is shown below. Figure 1 The electronic calibration circuit includes: at least two connection ports and at least two single-pole four-throw switches corresponding one-to-one with the at least two connection ports. Figure 1 Taking two connection ports and two single-pole four-throw switches as an example, the two connection ports are the first connection port Port1 and the second connection port Port2, and the two single-pole four-throw switches are the first single-pole four-throw switch 11 and the second single-pole four-throw switch 12.

[0036] The RF common terminal of the single-pole four-throw switch is connected to the connection port, and each RF port of the single-pole four-throw switch is connected to the transmission standard or the reflection standard. The single-pole four-throw switch includes a switching unit corresponding to each RF port. When the switching unit is turned off, the RF common terminal is opened.

[0037] Specifically, the single-pole four-throw switch includes one RF common terminal and four RF ports. The RF common terminal of the first single-pole four-throw switch 11 is defined as the first RF common terminal RFC (1), and the RF common terminal of the second single-pole four-throw switch 12 is defined as the second RF common terminal RFC (2). The RF common terminals of the single-pole four-throw switches are electrically connected to their corresponding connection ports; that is, the first RF common terminal RFC (1) is electrically connected to the first connection port Port1, and the second RF common terminal RFC (2) is electrically connected to the second connection port Port2. The connection ports are used to electrically connect to a vector network analyzer to receive signals output by the vector network analyzer or to input signals to the vector network analyzer.

[0038] Each single-pole four-throw switch includes four radio frequency (RF) ports. The four RF ports of the first single-pole four-throw switch 11 are defined as the first first RF port RF1 (1), the first second RF port RF2 (1), the first third RF port RF3 (1), and the first fourth RF port RF4 (1), respectively. The four RF ports of the second single-pole four-throw switch 12 are defined as the second first RF port RF1 (2), the second second RF port RF2 (2), the second third RF port RF3 (2), and the second fourth RF port RF4 (2), respectively. Each RF port is connected to a standard, which can be a reflection standard or a transmission standard, etc. None of the RF ports are connected to an open-circuit standard. When a certain RF port is connected to the RF common terminal, the standard connected to that RF port can be used to calibrate the vector network analyzer. It is understood that when one RF port is connected to the RF common terminal, the other RF ports are disconnected from the RF common terminal.

[0039] Each RF port corresponds to a switching unit, which is connected between the RF common terminal and the corresponding RF port. When the switching unit is turned on, the corresponding RF port is connected to the RF common terminal, and the vector network analyzer can be calibrated using the standard connected to the RF port. When the switching unit is turned off, the corresponding RF port is turned off. In this embodiment, the first first RF port RF1 (1) is defined as corresponding to the first first switching unit K1 (1), the first second RF port RF2 (1) is defined as corresponding to the first second switching unit K2 (1), the first third RF port RF3 (1) is defined as corresponding to the first third switching unit K3 (1), and the first fourth RF port RF4 (1) is defined as corresponding to the first fourth switching unit K4 (1). The second first RF port RF1 (2) is defined as corresponding to the second first switching unit K1 (2), the second second RF port RF2 (2) is defined as corresponding to the second second switching unit K2 (2), the second third RF port RF3 (2) is defined as corresponding to the second third switching unit K3 (2), and the second fourth RF port RF4 (2) is defined as corresponding to the second fourth switching unit K4 (2).

[0040] There are five standards for calibrating a vector network analyzer, including three reflection standards and two transmission standards. The three reflection standards are the load standard, short-circuit standard, and open-circuit standard; the two transmission standards are the straight-through standard and the attenuation standard. Since a single-pole four-throw switch only has four RF ports, to implement all five standards, related technologies need to use more single-pole four-throw switches, resulting in high circuit complexity.

[0041] In this embodiment, each RF port is connected to either a transmission standard or a reflection standard. Furthermore, all switching units of the single-pole quad-throw switch open the RF common terminal when turned off; that is, when the aforementioned switching units are turned off, the RF common terminal is not connected to any loop. The signal transmitted from the vector network analyzer to the RF common terminal is reflected when it reaches the aforementioned switching units because it cannot continue to transmit. Therefore, turning off the switching units of the single-pole quad-throw switch allows it to be used as an open-circuit standard for calibrating the vector network analyzer. In other words, this embodiment can turn off all switching units to perform open-circuit calibration of the vector network analyzer without needing an additional RF port to connect to the open-circuit standard. This saves one RF port used for connecting the open-circuit standard, allowing multiple standards to be implemented with a smaller number of single-pole quad-throw switches, reducing circuit complexity. Furthermore, reducing the number of cascaded single-pole quad-throw switches results in better RF link matching performance; the simplified circuit also reduces parasitic coupling caused by circuit components and additional links, enabling high-frequency performance characteristics; simultaneously, it reduces the difficulty of the control circuit, material costs, and manufacturing process complexity.

[0042] The technical solution of this embodiment employs an electronic calibration circuit including at least two connection ports and at least two single-pole four-throw switches corresponding to each of the connection ports. The RF common terminal of each single-pole four-throw switch is connected to the corresponding connection port, and each RF port of the single-pole four-throw switch is connected to a transmission standard or a reflection standard. Each single-pole four-throw switch includes a switching unit corresponding to each RF port; when the switching unit is turned off, the RF common terminal is open. By using single-pole four-throw switches where the switching unit opens the RF common terminal when turned off, one RF port used for connecting an open standard can be saved, thus enabling multiple standards to be implemented with a smaller number of single-pole four-throw switches, reducing circuit complexity.

[0043] Optionally, in some embodiments, the switching unit includes a common terminal, a first terminal, and a second terminal. The common terminal of the switching unit is connected to the radio frequency common terminal, the first terminal of the switching unit is connected to the radio frequency port, and the second terminal of the switching unit is left floating.

[0044] Specifically, the switching unit in this embodiment is a single-pole double-throw switch. The switching unit can be turned on or off by the control module. Take the first switching unit K1 (1) as an example. Its common terminal is a1, its first terminal is a2, and its second terminal is a3. When the switching unit is on, the common terminal of the switching unit is electrically connected to the first terminal of the switching unit; and when the switching unit is off, the common terminal of the switching unit is electrically connected to the second terminal of the switching unit. By setting the second terminal of the switching unit to be floating, when the switching unit is off, the RF common terminal is equivalent to a floating state, thereby enabling open-circuit calibration of the vector network analyzer. Or in other words, the switching unit is a reflective switch, which is in a floating state when off, thereby enabling open-circuit standard to achieve open-circuit calibration.

[0045] Optionally, in some other embodiments, the switching unit includes a first terminal and a second terminal. The first terminal of the switching unit is connected to a corresponding RF port, and the second terminal of the switching unit is connected to an RF common terminal.

[0046] Specifically, similar to a single-pole double-throw switch, in this embodiment, the switching unit connects the RF common terminal to the corresponding RF port when it is on. Unlike a single-pole double-throw switch, in this embodiment, the switching unit does not connect its second terminal (i.e., the port connected to the RF common terminal) to a floating port when it is off; instead, the second terminal of the switching unit is left floating. The switching unit can be implemented using a relay or transistor, etc.

[0047] It should be noted that when an open-circuit calibration of the vector network analyzer is required, all switching units are turned off by the control module. At this time, all switching units are floating, and the single-pole four-throw switch is equivalent to the open-circuit standard.

[0048] Alternatively, the switching unit can be a relay or a transistor, etc.

[0049] Alternatively, the connection port can be a connector, etc.

[0050] Optionally, continue to refer to Figure 1 The electronic calibration circuit also includes a control module 61, which is connected to at least two single-pole four-throw switches and is used to control the conduction state of the at least two single-pole four-throw switches.

[0051] Specifically, the control module 61 can be a microcontroller or an MCU (Microcontroller Unit). When the vector network analyzer needs to be calibrated (excluding open-circuit calibration), the control module 61 controls the corresponding standard and RF common terminal to be turned on; when the vector network analyzer needs to be calibrated (open-circuit calibration), the control module 61 controls all switching units to be turned off.

[0052] Optionally, in some embodiments, the control module includes at least two shutdown signal output units corresponding one-to-one with at least two single-pole four-throw switches. The shutdown signal output units are electrically connected to the control terminals of the corresponding switching units in the single-pole four-throw switches. The shutdown signal output units are used to shut down the switching units in response to an open-circuit calibration signal.

[0053] Specifically, the control module can control one of the single-pole four-throw switches to be turned on to achieve the corresponding calibration. The specific implementation method is well known to those skilled in the art and will not be elaborated here. In this embodiment, the control module can also achieve open-circuit calibration of the vector network analyzer through a shutdown signal output unit. More specifically, upon receiving an open-circuit calibration signal, the shutdown signal output unit can control all switch units in the single-pole four-throw switch to be calibrated to be turned off, thereby achieving open-circuit calibration. The shutdown signal output unit is, for example, a decoder, which decodes the open-circuit calibration signal into a signal that drives each switch unit to turn off.

[0054] Optionally, in some implementations, the control module 61 is also used to supply power to at least two single-pole four-throw switches.

[0055] Optionally, continue to refer to Figure 1 The number of at least two single-pole four-throw switches is two; the first radio frequency port of the first single-pole four-throw switch 11 is connected to the first load circuit 21, the second radio frequency port of the first single-pole four-throw switch 11 is connected to the first end of the through circuit 31, the third radio frequency port of the first single-pole four-throw switch 11 is connected to the first end of the attenuation circuit 32, and the fourth radio frequency port of the first single-pole four-throw switch 11 is connected to the first short-circuit circuit 22.

[0056] The first RF port of the second single-pole four-throw switch 12 is connected to the second load circuit 23, the second RF port of the second single-pole four-throw switch is connected to the second end of the attenuation circuit 32, the third RF port of the second single-pole double-throw switch 12 is connected to the second end of the through circuit 31, and the fourth RF port of the second single-pole four-throw switch 12 is connected to the second short-circuit circuit 24.

[0057] Specifically, the electronic calibration circuit in this embodiment includes two connection ports, meaning it can simultaneously calibrate two ports of the vector network analyzer. The load circuit is the load standard, the short-circuit circuit is the short-circuit standard, the through circuit is the through standard, and the attenuation circuit is the attenuation standard. The radio frequency ports (second and third radio frequency ports) of the two single-pole four-throw switches connected to the two transmission standards are connected in reverse order, thus achieving interconnection between the two single-pole four-throw switches. Since the electronic calibration circuit does not require an additional open-circuit standard port, it only needs two single-pole four-throw switches to achieve calibration of five standards for two-port calibration, offering advantages such as simple circuit structure, low control difficulty, low material cost, and low manufacturing difficulty.

[0058] Optionally, Figure 2 A schematic diagram of the circuit structure of another electronic calibration circuit provided in this embodiment of the present invention is shown below. Figure 2 In this embodiment, the number of at least two single-pole four-throw switches is four; the at least two single-pole four-throw switches include a first single-pole four-throw switch 11, a second single-pole four-throw switch 12, a third single-pole four-throw switch 13, and a fourth single-pole four-throw switch 14; the electronic calibration circuit also includes a first single-pole double-throw switch 41 and a second single-pole double-throw switch 42. To simplify the circuit, Figure 2 The common RF terminal of each single-pole four-throw switch is marked as RFC, the first RF port is marked as RF1, the second RF port is marked as RF2, the third RF port is marked as RF3, and the fourth RF port is marked as RF4. The first RF port of the first single-pole four-throw switch 11 is connected to the first load circuit 21, the second RF port of the first single-pole four-throw switch 11 is connected to the first RF port of the first single-pole double-throw switch 41, the third RF port of the first single-pole four-throw switch 11 is connected to the first terminal of the first straight-through circuit 33, and the fourth RF port of the first single-pole four-throw switch 11 is connected to the first short-circuit circuit 22.

[0059] The first RF port of the second single-pole four-throw switch 12 is connected to the second load circuit 23, the second RF port of the second single-pole four-throw switch 12 is connected to the first end of the second through circuit 34, the third RF port of the second single-pole four-throw switch 12 is connected to the first RF port of the second single-pole double-throw switch 42, and the fourth RF port of the second single-pole four-throw switch 12 is connected to the second short-circuit circuit 24.

[0060] The first RF port of the third single-pole four-throw switch 13 is connected to the third load circuit 25, the second RF port of the third single-pole four-throw switch 13 is connected to the second end of the first straight-through circuit 33, the third RF port of the third single-pole four-throw switch 13 is connected to the second RF port of the first single-pole double-throw switch 41, and the fourth RF port of the third single-pole four-throw switch 13 is connected to the third short-circuit circuit 26.

[0061] The first RF port of the fourth single-pole four-throw switch 14 is connected to the fourth load circuit 27, the second RF port of the fourth single-pole four-throw switch 14 is connected to the second RF port of the second single-pole double-throw switch 42, the third RF port of the fourth single-pole four-throw switch 14 is connected to the second end of the second through circuit 34, and the fourth RF port of the fourth single-pole four-throw switch 14 is connected to the fourth short-circuit circuit 28; the common terminal of the first single-pole double-throw switch 41 is connected to the first end of the third through circuit 35, and the common terminal of the second single-pole double-throw switch 42 is connected to the second end of the third through circuit 35.

[0062] Specifically, the electronic calibration circuit of this embodiment includes four connection ports: Port1, Port2, Port3, and Port4. Each of the four connection ports corresponds to a single-pole four-throw switch (SPS). Each SPS is connected to both a load standard and a short-circuit standard. When open-circuit calibration is required, the switching units in the SPS can be turned off, and the switching units are then reused as the open-circuit standard. The electronic calibration circuit of this embodiment can achieve direct connection between the four connection ports with fewer SPS, and each SPS can implement short-circuit, load, and open-circuit standards, thus achieving multiple standards with a relatively simple circuit structure.

[0063] It should be noted that the circuits for the short-circuit standard, load standard, shoot-through standard, and attenuation standard mentioned above can use microwave modules, the specific structure of which is well known to those skilled in the art and will not be described in detail here.

[0064] Optionally, the above-mentioned single-pole four-throw switch can be an SP4T RF switch; the above-mentioned single-pole double-throw switch can be an SPDT RF switch.

[0065] Optionally, Figure 3 A schematic diagram of the circuit structure of another electronic calibration circuit provided in this embodiment of the present invention is shown below. Figure 3 The electronic calibration circuit also includes a temperature control module 51, which is connected to the control module 61. The temperature control module 61 is used to control the temperature of the electronic calibration circuit. More specifically, the electronic calibration circuit can be housed within a cavity, and the temperature control module 61 can control the temperature of the cavity to keep the electronic calibration circuit within the required temperature range, thereby meeting the corresponding calibration requirements.

[0066] Optionally, continue to refer to Figure 3 The electronic calibration circuit also includes a communication and storage module 52, which is connected to the control module 61.

[0067] Specifically, the communication and storage module 52 is used to connect to the vector network analyzer. The vector network analyzer and the control module 61 interact through the communication and storage module 52 to obtain relevant information from the vector network analyzer. Furthermore, various parameters of the electronic calibration circuit, such as the specific parameters of various standards, can be stored in the communication and storage module.

[0068] Based on the same inventive concept, this utility model also provides an electronic calibration component, which includes the electronic calibration circuit provided in any embodiment of this utility model. Since the electronic calibration component provided in this utility model embodiment includes the electronic calibration circuit provided in any embodiment of this utility model, it also possesses the same beneficial effects, and will not be described further here.

[0069] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0070] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electronic calibration circuit, characterized in that, include: At least two connection ports and at least two single-pole four-throw switches corresponding one-to-one with the at least two connection ports; The RF common terminal of the single-pole four-throw switch is connected to the corresponding connection port, and each RF port of the single-pole four-throw switch is connected to a transmission standard or a reflection standard; the single-pole four-throw switch includes a switching unit corresponding to each RF port, and the RF common terminal is opened when the switching unit is turned off.

2. The electronic calibration circuit according to claim 1, characterized in that, The switching unit includes a common terminal, a first terminal, and a second terminal. The common terminal of the switching unit is connected to the radio frequency common terminal, the first terminal of the switching unit is connected to the corresponding radio frequency port, and the second terminal of the switching unit is left floating. Alternatively, the switching unit includes a first terminal and a second terminal, the first terminal of the switching unit being connected to the corresponding radio frequency port, and the second terminal of the switching unit being connected to the radio frequency common terminal.

3. The electronic calibration circuit according to claim 1, characterized in that, The number of the at least two single-pole four-throw switches is two; the at least two single-pole four-throw switches include a first single-pole four-throw switch and a second single-pole four-throw switch; The first radio frequency port of the first single-pole four-throw switch is connected to the first load circuit, the second radio frequency port of the first single-pole four-throw switch is connected to the first end of the through circuit, the third radio frequency port of the first single-pole four-throw switch is connected to the first end of the attenuation circuit, and the fourth radio frequency port of the first single-pole four-throw switch is connected to the first short-circuit circuit. The first RF port of the second single-pole four-throw switch is connected to the second load circuit, the second RF port of the second single-pole four-throw switch is connected to the second end of the attenuation circuit, the third RF port of the second single-pole four-throw switch is connected to the second end of the through circuit, and the fourth RF port of the second single-pole four-throw switch is connected to the second short-circuit circuit.

4. The electronic calibration circuit according to claim 1, characterized in that, The number of the at least two single-pole four-throw switches is four; the at least two single-pole four-throw switches include a first single-pole four-throw switch, a second single-pole four-throw switch, a third single-pole four-throw switch, and a fourth single-pole four-throw switch; the electronic calibration circuit also includes a first single-pole double-throw switch and a second single-pole double-throw switch; The first radio frequency port of the first single-pole four-throw switch is connected to the first load circuit, the second radio frequency port of the first single-pole four-throw switch is connected to the first radio frequency port of the first single-pole double-throw switch, the third radio frequency port of the first single-pole four-throw switch is connected to the first end of the first through circuit, and the fourth radio frequency port of the first single-pole four-throw switch is connected to the first short-circuit circuit. The first RF port of the second single-pole four-throw switch is connected to the second load circuit, the second RF port of the second single-pole four-throw switch is connected to the first end of the second through circuit, the third RF port of the second single-pole four-throw switch is connected to the first RF port of the second single-pole double-throw switch, and the fourth RF port of the second single-pole four-throw switch is connected to the second short-circuit circuit. The first radio frequency port of the third single-pole four-throw switch is connected to the third load circuit, the second radio frequency port of the third single-pole four-throw switch is connected to the second end of the first through circuit, the third radio frequency port of the third single-pole four-throw switch is connected to the second radio frequency port of the first single-pole double-throw switch, and the fourth radio frequency port of the third single-pole four-throw switch is connected to the third short-circuit circuit. The first RF port of the fourth single-pole four-throw switch is connected to the fourth load circuit, the second RF port of the fourth single-pole four-throw switch is connected to the second RF port of the second single-pole double-throw switch, the third RF port of the fourth single-pole four-throw switch is connected to the second end of the second through circuit, and the fourth RF port of the fourth single-pole four-throw switch is connected to the fourth short-circuit circuit. The common terminal of the first single-pole double-throw switch is connected to the first terminal of the third through circuit, and the common terminal of the second single-pole double-throw switch is connected to the second terminal of the third through circuit.

5. The electronic calibration circuit according to claim 1, characterized in that, The electronic calibration circuit also includes a control module; The control module is connected to the at least two single-pole four-throw switches, and the control module is used to control the conduction state of the at least two single-pole four-throw switches.

6. The electronic calibration circuit according to claim 5, characterized in that, The control module includes at least two shutdown signal output units corresponding to the at least two single-pole four-throw switches. The shutdown signal output units are electrically connected to the control terminals of the corresponding switch units in the single-pole four-throw switches. The shutdown signal output units are used to shut down the switch units in response to an open-circuit calibration signal.

7. The electronic calibration circuit according to claim 5, characterized in that, The control module is also used to supply power to the at least two single-pole four-throw switches.

8. The electronic calibration circuit according to claim 5, characterized in that, The electronic calibration circuit also includes a temperature control module, which is connected to the control module.

9. The electronic calibration circuit according to claim 5, characterized in that, The electronic calibration circuit also includes a communication and storage module, which is connected to the control module.

10. An electronic calibration component, characterized in that, The electronic calibration component includes the electronic calibration circuit as described in any one of claims 1-9.

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