Power-adjustable amplitude limiter capable of keeping state
The power adjustable limiter circuit with a signal keeper addresses the issues of fixed limit levels and slow response in existing amplifiers by controlling power levels and maintaining the limiter state, protecting downstream components and ensuring quick response.
Patent Information
- Application Number
- CN202421725099.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In existing communication equipment, the limiting level of the limiter is fixed and the response speed is slow, resulting in excessive power of the receiving unit, easy to burn, and a small range of limiting level debugging and low accuracy.
A power adjustable limiter that can be maintained is designed, including couplers, switching limiter diodes, post-stage limiter, detectors, comparators and drivers. The limiting state duration is extended through the signal holder, combined with the PIN diode driver to control the on and off states of the switching limiting diodes, and a high reverse voltage and low capacitor PIN diode is used to connect in parallel to limit high-power signals.
The adjustment of the limiting level and the balancing of the response speed is achieved, the average power of the rear-stage limiter is reduced, the limiter and the rear-stage circuit are protected, and the limiter and diode burning is avoided.
Smart Images
Figure CN223109984U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of limiters, and more specifically, it relates to a power adjustable limiter capable of maintaining a state. Background Technique
[0002] In the modern communication field, the transmitting unit and the receiving unit of a communication device often share the same antenna. The two units are connected to the common end using a transceiver switch or a circulator. Since the antenna is not an ideal component, the high-power signal generated by the transmitting unit cannot be completely radiated by the antenna, and some high-power signals will be reflected back to the transceiver and enter the receiving unit; the standing wave of the antenna is usually poor, and the power of the reflected signal is relatively high. In severe cases, even total reflection will occur, which will cause the power input to the receiving unit to be too high, resulting in the components in the receiving unit being burned out. Therefore, in practical applications, a limiter is usually set at the front end of the receiving unit to prevent such a situation from occurring.
[0003] Generally, a passive self-limiting limiter has the advantage of fast limiter response speed. However, the power tolerance of the detection diode is fixed, and the limiter level of the limiter is fixed with the shaping of the coupler. Since the coupling signal is too small to drive the detection diode, the adjustable range of the limiter level of the limiter is very small and the accuracy is not high.
[0004] Adding a comparator and a PIN diode driver after the detection tube of a passive limiter can form an active limiter circuit. The limiter level of this circuit can be easily changed by changing the reference voltage of the comparator, and the debugging accuracy is relatively high. However, since this circuit needs to process signals through multiple circuits such as detection, comparison, and driving, its limiter response speed is slower. When limiting a pulse signal, the situation shown in Figure 1 may occur. This situation will cause the average power loaded on the limiter diode in the subsequent limiter to be too high, burning out the limiter diode, and thus causing the limiter to burn out. To reduce the average power on the subsequent diode, it is necessary to keep the limiter in the triggered limiting state for a period of time to reduce the average power on the limiter diode in the subsequent limiter. Summary of the Invention
[0005] The purpose of the utility model is to provide a power adjustable limiter capable of maintaining a state to solve the problems existing in the above background technique.
[0006] The above technical purpose of the utility model is achieved through the following technical solutions:
[0007] The present application provides a power adjustable limiter capable of maintaining a state, including a coupler, a switch limiter diode, and a subsequent limiter connected in sequence, and also including a detector, a comparator, and a driver connected in sequence, where:
[0008] The detector is also connected to the coupler, and the driver is also connected to the switching limiting diode;
[0009] The power adjustable limiter further includes a signal holder for outputting the limiting state judgment signal output by the comparator to the driver after extending the preset duration according to the receiver operating state signal. The signal holder is located between the comparator and the driver, and the input end of the signal holder is connected to the output end of the comparator, and the output end of the signal holder is connected to the input end of the driver.
[0010] Based on the above technical solutions, the present utility model can be further improved as follows.
[0011] Further, an absorption resistor R1 is provided in the above coupler. One end of the absorption resistor R1 is grounded, and the other end of the absorption resistor R1 is connected into the coupler, and the end of the coupler away from the absorption resistor R1 is connected to the detector.
[0012] Further, the above detector includes a diode V1, a capacitor C1, and a resistor R2, where:
[0013] The anode of the diode V1 is connected to the signal output end of the coupler, the cathode of the diode V1 is connected to one end of the capacitor C1 and one end of the resistor R2, and the other ends of the capacitor C1 and the resistor R2 are both grounded.
[0014] Further, the above diode V1 is a Schottky diode.
[0015] Further, the above comparator is connected to a reference voltage input circuit through a reference voltage input terminal. The signal input terminal of the comparator is connected to the cathode of the diode V1. The reference voltage input circuit includes a capacitor C2, a resistor R3, and a resistor R4, where:
[0016] One end of the resistor R3 forms an access terminal for receiving a reference signal for receiving the high-level state and low-level state of the transceiver control and enabling the limiter to enter the trigger limiting state. The other end of the resistor R3 is respectively connected to one end of the resistor R4, one end of the capacitor C2, and the reference voltage input terminal of the comparator. The other ends of the capacitor C2 and the resistor R4 are both grounded.
[0017] Further, the above driver is a PIN diode driver, which is used to receive the indication signal output by the signal holder and provide a current or voltage for maintaining conduction or maintaining cutoff for the switching limiting diode.
[0018] Further, one end of the output terminal of the above driver is respectively connected to one end of a capacitor C5 and one end of an inductor L1. The other end of the capacitor C5 is grounded, and the other end of the inductor L1 is connected to the subsequent limiter.
[0019] Further, the above-mentioned post-stage limiter includes a switching limiter circuit, and the switching limiter circuit includes capacitor C3, capacitor C4, switching limiter diode V2, and switching limiter diode V3, where:
[0020] One end of capacitor C3 is connected to the coupler, and the other end of capacitor C3 is respectively connected to the anode of switching limiter diode V2, the anode of switching limiter diode V3, the other end of inductor L1, and one end of capacitor C4. The cathodes of switching limiter diode V2 and switching limiter diode V3 are both grounded.
[0021] Further, the above-mentioned post-stage limiter is also connected with high reverse voltage limiter diode V4, high reverse voltage limiter diode V5, low trigger voltage limiter diode V6, and low trigger voltage limiter diode V7, where:
[0022] The other end of capacitor C4 in the switching limiter circuit is successively connected to the anode of high reverse voltage limiter diode V4, the cathode of high reverse voltage limiter diode V5, the anode of low trigger voltage limiter diode V6, and the cathode of low trigger voltage limiter diode V7. The cathodes of high reverse voltage limiter diode V4, the anodes of high reverse voltage limiter diode V5, the cathodes of low trigger voltage limiter diode V6, and the anodes of low trigger voltage limiter diode V7 are all grounded.
[0023] Further, the above-mentioned switching limiter diode V2 and switching limiter diode V3 are high-voltage-resistant limiter diodes.
[0024] Compared with the prior art, the present utility model has at least the following beneficial effects:
[0025] In this application, the coupler extracts the RF signal on the main line of the limiter at a certain ratio, reduces the RF signal to an appropriate power with a sufficiently small impact on the main line RF signal, and sends it to the detector; the detector consists of a Schottky diode, resistors, and capacitors, and is used to detect the envelope and power of the main line RF signal; the comparator compares the envelope and power information of the main line signal detected by the detector with a reference level, is used to determine whether the limiter needs to enter the limiting state, and provides a limiting state judgment signal to the subsequent circuit; the signal holder with controllable working state is controlled by the working state signal of the receiver to determine whether it works. When it does not work, no signal is output. When it works, it extends the duration of the limiting state judgment signal output by the comparator and outputs it to the subsequent stage, and is used to indicate the state of the switching limiting diode; the PIN diode driver receives the indication signal output by the holder and provides the current and voltage for maintaining conduction or cutoff of the switching limiting diode; the switching limiting diode uses a PIN diode with a high reverse voltage and low capacitance. Usually, multiple diodes are connected in parallel to the signal main line and are used for limiting high-power signals; the subsequent stage limiter consists of a group of high reverse voltage limiting diodes and multiple medium and low reverse voltage limiting diodes connected in parallel, and is used to limit the high-power RF signal leaked from the previous stage and the high-power signal with relatively low power, and determines the output level of the limiter.
[0026] In this application, the purpose of the power adjustable limiter with maintainable state is to reduce the average power of the RF signal leaked to the subsequent stage limiter while maintaining the accurate adjustment of the limiting level. A signal holder is added between the comparator and the PIN diode driver on the basis of the power adjustable limiter, so that the limiter can maintain the triggered limiting state for a long time to protect the limiter itself and the subsequent circuit of the limiter, and the working state of the holder is controlled by the working indication signal of the receiver, so that the limiter can be restored to the untriggered limiting state in time when the receiver works. Whether the reference voltage of the comparator exists is controlled by the transceiver, so that the limiter can maintain the triggered limiting state for a long time when needed.
[0027] In this application, while maintaining the advantages of the active limiting limiter, the adjustability of the limiting level is provided, and the slow response speed of the active limiting limiter to the limiter itself and the subsequent circuit is reduced; at the same time, the limiting or non-limiting state can be forcibly maintained according to the working states of the transceiver and the receiver. Description of the Drawings
[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:
[0029] Figure 1 It is a high-power signal leakage diagram of the switching limiter stage of the active limiting limiter in the embodiment of the present invention;
[0030] Figure 2 This is a schematic diagram of the circuit model of the power adjustable limiter that can maintain its state in the embodiment of the present invention;
[0031] Figure 3 This is the implementation effect diagram of the power adjustable limiter that can maintain its state in the embodiment of the present invention;
[0032] Figure 4 This is a schematic diagram of the circuit connection of the power adjustable limiter that can maintain its state in the embodiment of the present invention. Detailed implementation manners
[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.
[0035] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0036] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.
[0037] In addition, if terms such as "horizontal", "vertical", "hanging" are used, it does not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0038] In the description of the embodiments of the present utility model, "a plurality of" represents at least two.
[0039] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and defined, if the terms "arranged", "installed", "connected", "linked" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0040] Embodiment 1: To reduce the average power on the rear-stage diode and keep the limiter in the triggered limiting state for a period of time to reduce the average power on the limiting diode in the rear-stage limiter, the present embodiment provides a power-adjustable limiter capable of maintaining a state, which includes a coupler, a switch limiting diode, and a rear-stage limiter connected in sequence, as Figure 2 shown, and also includes a detector, a comparator, and a driver connected in sequence, where: the detector is also connected to the coupler, and the driver is also connected to the switch limiting diode; the power-adjustable limiter further includes a signal holder for extending the preset duration of the limiting state judgment signal output by the comparator according to the receiver working state signal and outputting it to the driver. The signal holder is located between the comparator and the driver, and the input end of the signal holder is connected to the output end of the comparator, and the output end of the signal holder is connected to the input end of the driver.
[0041] Optionally, an absorption resistor R1 is arranged in the above-mentioned coupler, as Figure 4 shown. One end of the absorption resistor R1 is grounded, the other end of the absorption resistor R1 is connected into the coupler, and the end of the coupler away from the absorption resistor R1 is connected to the detector.
[0042] Optionally, the above-mentioned detector includes a diode V1, a capacitor C1, and a resistor R2, as Figure 4 shown, where:
[0043] The anode of the diode V1 is connected to the signal output end of the coupler, the cathode of the diode V1 is connected to one end of the capacitor C1 and one end of the resistor R2, and the other ends of the capacitor C1 and the resistor R2 are both grounded; the above-mentioned diode V1 is a Schottky diode.
[0044] Optionally, the above-mentioned comparator is connected with a reference voltage input circuit through a reference voltage input terminal, the signal input terminal of the comparator is connected to the cathode of the diode V1, and the reference voltage input circuit includes a capacitor C2, a resistor R3, and a resistor R4, as Figure 4 shown, where:
[0045] One end of the resistor R3 forms an access terminal for receiving a reference signal that receives the high-level state and the low-level state of the transceiver control and makes the limiter enter the trigger limiter state. The other end of the resistor R3 is respectively connected to one end of the resistor R4, one end of the capacitor C2, and the reference voltage input terminal of the comparator. The other end of the capacitor C2 and the other end of the resistor R4 are both grounded.
[0046] Optionally, the above-mentioned driver is a PIN diode driver, which is used to receive the indication signal output by the signal holder and provide a current or voltage for maintaining conduction or maintaining cut-off for the switch limiter diode.
[0047] Optionally, one end of the output terminal of the above-mentioned driver is respectively connected to one end of the capacitor C5 and one end of the inductor L1. The other end of the capacitor C5 is grounded, and the other end of the inductor L1 is connected to the subsequent limiter.
[0048] Optionally, the above-mentioned subsequent limiter includes a switch limiting circuit. The switch limiting circuit includes a capacitor C3, a capacitor C4, a switch limiting diode V2, and a switch limiting diode V3, as Figure 4 shown, where:
[0049] One end of the capacitor C3 is connected to the coupler. The other end of the capacitor C3 is respectively connected to the anode of the switch limiting diode V2, the anode of the switch limiting diode V3, the other end of the inductor L1, and one end of the capacitor C4. The cathodes of the switch limiting diode V2 and the switch limiting diode V3 are both grounded.
[0050] Optionally, the above-mentioned subsequent limiter is also connected to a high reverse voltage limiting diode V4, a high reverse voltage limiting diode V5, a low trigger voltage limiting diode V6, and a low trigger voltage limiting diode V7, as Figure 4 shown, where:
[0051] The other end of the capacitor C4 in the switch limiting circuit is sequentially connected to the anode of the high reverse voltage limiting diode V4, the cathode of the high reverse voltage limiting diode V5, the anode of the low trigger voltage limiting diode V6, and the cathode of the low trigger voltage limiting diode V7. The cathodes of the high reverse voltage limiting diode V4, the anode of the high reverse voltage limiting diode V5, the cathode of the low trigger voltage limiting diode V6, and the anode of the low trigger voltage limiting diode V7 are all grounded.
[0052] Optionally, the above-mentioned switch limiting diodes V2 and V3 are high-voltage-resistant limiting diodes.
[0053] Embodiment 2: The purpose of the power adjustable limiter that can maintain the state is to reduce the average power of the RF signal leaking to the subsequent limiter while ensuring that the limiter level can be accurately adjusted. In this embodiment, a signal holder is added between the comparator and the PIN diode driver on the basis of the power adjustable limiter, so that the limiter can maintain the triggered limiter state for a long time to protect the limiter itself and the subsequent circuit of the limiter. The working state of the holder is controlled by the receiver working indication signal, so that the limiter can be restored to the untriggered limiter state in time when the receiver is working. Whether the reference voltage of the comparator exists is controlled by the transceiver, so that the limiter can maintain the triggered limiter state for a long time when needed. The solution provided by this embodiment includes: a coupler, a detector, a comparator, a signal holder with controllable working state, a PIN diode driver, a switch limiter diode, and a subsequent limiter.
[0054] Specifically, the coupler extracts the RF signal on the main line of the limiter at a certain ratio, reduces the RF signal to an appropriate power with a small enough impact on the main line RF signal, and sends it to the detector.
[0055] Further, the detector consists of a Schottky diode, a resistor, and a capacitor, and is used to detect the envelope and power of the main line RF signal.
[0056] Further, the comparator compares the envelope and power information of the main line signal detected by the detector with the reference level, is used to judge whether the limiter needs to enter the limiter state, and provides a limiter state judgment signal to the subsequent circuit.
[0057] Further, the signal holder with controllable working state is controlled by the receiver working state signal whether it works. When it does not work, no signal is output. When it works, it extends the duration of the limiter state judgment signal output by the comparator and outputs it to the subsequent stage, and is used to indicate what state the switch limiter diode is in.
[0058] Further, the PIN diode driver receives the indication signal output by the holder and provides the current and voltage to maintain conduction or cut-off for the switch limiter diode.
[0059] Further, the switch limiter diode uses a PIN diode with a high reverse voltage and low capacitance. Usually, multiple diodes are connected in parallel to the signal main line and are used for the limiting of high-power signals.
[0060] Further, the subsequent limiter is composed of a group of high reverse voltage limiter diodes and multiple medium and low reverse voltage limiter diodes connected in parallel, and is used to limit the high-power RF signal and the high-power signal with relatively low power leaking from the previous stage, and determine the output level of the limiter.
[0061] Specifically, refer to the attached drawings Figure 2, a high-power RF signal accesses this limiter through the terminal labeled RFin. When passing through the coupler, the coupler collects and converts it into a low-power RF signal and inputs it into the detector. The detector detects the envelope and power of the main-line signal and forms a video signal to input into the comparator. The comparator compares the voltage of the video signal with a preset reference voltage representing the limiter trigger power. This preset value can be adjusted according to the needs of the limiter and the existence of the reference voltage is controlled by the transceiver, thereby realizing the change of the limiter threshold level. When the comparator determines that the voltage of the detected signal is greater than the preset value, it means that the power of the RF signal on the main line is greater than the threshold level value. The comparator inputs a signal indicating that the limiter enters the trigger-limiting state to the holder. The enable terminal of the holder accesses the working state signal of the receiver. When the receiver is in the working state, the output signal of the holder can be interrupted in time, so that the limiter enters the non-trigger-limiting state. When the system is in the non-receiving state, the holder extends the duration of the trigger-limiting state signal and inputs it to the PIN diode driver. The PIN diode driver receives the trigger-limiting state signal, generates the electrical signal required when the PIN diode conducts, and inputs it to the switching limiter diode to make it conduct, so that the limiter enters the trigger-limiting state and prevents high-power signals from entering the receiver. Due to the extension of the time of the trigger-limiting state signal, the situation in Figure 1 is changed to the situation in Figure 3 , thus realizing the effect of protecting the limiter and the subsequent circuit and reducing the average power borne by the subsequent limiter. The limiter provided in this embodiment can adjust the limiter threshold level of the limiter and reduce the harm to the circuit and components caused by the slow response speed of the active limiter.
[0062] Specifically, as shown in Figure 4Shown is a limiter circuit diagram capable of handling L-band pulsed RF signals with a power of 500W. At the limiter signal input, there is a coupler set with a coupling degree of 45 dB. R1 is the absorption resistor of the coupler. The RF signal is transmitted along the direction from RFin to RFout, that is, the signal output end of the coupler is the end far from the resistor R1. V1 is a Schottky diode for signal detection, with forward detection characteristics. The anode of the Schottky diode V1 is connected to the signal output end of the coupler, and the cathode is connected to the capacitor C1 and the resistor R2. The other ends of the capacitor C1 and the resistor R2 that are not connected to the cathode of the Schottky diode V1 are grounded to the ground plane. The above three devices form a detector. The comparator collects the video signal from the cathode end of the Schottky diode V1 as one input signal of the comparator. The reference signal is controlled by the transceiver to be in a high-level state (voltage +5V) and a low-level state (voltage 0V) and is used to force the limiter into the triggered limiting state. The reference signal is connected to one end of the resistor R3. The resistor R4 and the capacitor C2 are connected in parallel to the other end of the resistor R3. The ends of the resistor R4 and the capacitor C2 that are not connected to the resistor R3 are grounded to the ground plane. The resistors R3 and R4 divide the voltage of the reference signal. The comparator collects the signal at the connection point of the two resistors as the comparison reference voltage of the comparator. This voltage corresponds to the limiting level of the limiter. In this embodiment, it is required that the limiter uses a switching limiting diode for limiting when the input signal power is greater than 90W. The resistors R3 and R4 set the comparison reference voltage input to the comparator to the corresponding detection voltage when the RF signal power on the main line is 90W. The capacitor C2 is used to stabilize the comparison reference voltage input to the comparator. When the detection voltage is greater than the comparison reference voltage, the comparator outputs a high-level signal and enters the signal holding circuit. The working enable interface of the signal holding circuit is connected to the receiver working state signal, which is used to control whether the signal holding circuit works, forcing the limiter into the non-triggered limiting state. The holder extends the signal time output by the comparator from a length similar to the RF signal pulse width to a length that can cover several pulse periods and inputs it into the PIN diode driver. When the input signal of the PIN diode driver is at a high level, the driver outputs a positive voltage, providing a conduction current for the switching limiting diode and making the switching limiting diode conduct, and the limiter enters the triggered limiting state. When the input signal of the PIN diode driver is at a low level, the driver outputs a negative voltage, keeping the switching limiting diode cut off, and the limiter switching limiting diode enters the non-triggered limiting state. The capacitor C5 and the inductor L1 are used to stabilize the drive signal and isolate the RF signal on the main line from the driver.The switch limiting circuit is composed of two capacitors C3 and C4 connected in series on the main line, and switch limiting diodes V2 and V3 connected in parallel to the main line with their anodes. The switch limiter is used to process high-power RF signals. The subsequent-stage limiter is composed of high-reverse-voltage limiting diodes V4, high-reverse-voltage limiting diodes V5, low-trigger-voltage limiting diodes V6, and low-trigger-voltage limiting diodes V7. Among them, the limiting diodes V4 and V6 are connected in parallel to the main line with their anodes, as shown in. Figure 4 As shown, the limiting diodes V5 and V7 are connected in parallel to the main line with their cathodes. The subsequent-stage limiter is used to process the high-power signals leaking from the switch limiting diodes and the high-power signals with relatively low power. Among them, the low-trigger-voltage limiting diodes V6 and V7 determine the maximum output signal power of the limiter. The limiter provided in this embodiment maintains the advantages of the self-limiting limiter while providing the adjustability of the limiting level, and reduces the harm to the circuit and devices caused by the slow response speed of the self-limiting limiter.
[0063] The specific implementation manners described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A power adjustable limiter capable of maintaining a state, characterized in that, It includes a coupler, a switch limiter diode, and a post-stage limiter connected in sequence, and also includes a detector, a comparator, and a driver connected in sequence, where: The detector is also connected to the coupler, and the driver is also connected to the switch limiter diode; The power adjustable limiter further includes a signal holder for outputting the limiter state judgment signal output by the comparator to the driver after extending the preset duration according to the receiver operating state signal. The signal holder is located between the comparator and the driver, and the input end of the signal holder is connected to the output end of the comparator, and the output end of the signal holder is connected to the input end of the driver.
2. The power adjustable limiter capable of maintaining a state according to claim 1, characterized in that, An absorption resistor R1 is provided in the coupler. One end of the absorption resistor R1 is grounded, and the other end of the absorption resistor R1 is connected into the coupler, and the end of the coupler away from the absorption resistor R1 is connected to the detector.
3. The power adjustable limiter capable of maintaining a state according to claim 2, wherein, The detector includes a diode V1, a capacitor C1, and a resistor R2, where: The anode of the diode V1 is connected to the signal output end of the coupler, and the cathode of the diode V1 is connected to one end of the capacitor C1 and one end of the resistor R2. The other end of the capacitor C1 and the other end of the resistor R2 are both grounded.
4. The power adjustable limiter capable of maintaining a state according to claim 3, wherein, The diode V1 is a Schottky diode.
5. A power adjustable limiter capable of maintaining a state according to claim 4, characterized in that, The comparator is connected to a reference voltage input circuit through a reference voltage input terminal. The signal input terminal of the comparator is connected to the cathode of the diode V1. The reference voltage input circuit includes a capacitor C2, a resistor R3, and a resistor R4, where: One end of the resistor R3 forms an access terminal for receiving the reference signal of the transceiver control high-level state and low-level state and making the limiter enter the trigger limiter state. The other end of the resistor R3 is respectively connected to one end of the resistor R4, one end of the capacitor C2, and the reference voltage input terminal of the comparator. The other end of the capacitor C2 and the other end of the resistor R4 are both grounded.
6. The power adjustable limiter capable of maintaining a state according to claim 5, characterized in that, The driver is a PIN diode driver, which is used to receive the indication signal output by the signal holder and provide the current or voltage for maintaining conduction or maintaining cut-off for the switch limiter diode.
7. A power adjustable limiter capable of maintaining a state according to claim 6, characterized in that, The output end of the driver is respectively connected to one end of a capacitor C5 and one end of an inductor L1. The other end of the capacitor C5 is grounded, and the other end of the inductor L1 is connected to the post-stage limiter.
8. The power adjustable limiter capable of maintaining a state according to claim 7, wherein The post-stage limiter includes a switch limiter circuit. The switch limiter circuit includes a capacitor C3, a capacitor C4, a switch limiter diode V2, and a switch limiter diode V3, where: One end of the capacitor C3 is connected to the coupler. The other end of the capacitor C3 is respectively connected to the anode of the switch limiter diode V2, the anode of the switch limiter diode V3, the other end of the inductor L1, and one end of the capacitor C4. The cathodes of the switch limiter diode V2 and the switch limiter diode V3 are both grounded.
9. The power adjustable limiter capable of maintaining a state according to claim 8, characterized in that, The post-stage limiter is also connected to a high reverse voltage limiter diode V4, a high reverse voltage limiter diode V5, a low trigger voltage limiter diode V6, and a low trigger voltage limiter diode V7, where: The other end of the capacitor C4 in the switch limiting circuit is successively connected to the anode of the high reverse voltage limiting diode V4, the cathode of the high reverse voltage limiting diode V5, the anode of the low trigger voltage limiting diode V6, and the cathode of the low trigger voltage limiting diode V7. The cathode of the high reverse voltage limiting diode V4, the anode of the high reverse voltage limiting diode V5, the cathode of the low trigger voltage limiting diode V6, and the anode of the low trigger voltage limiting diode V7 are all grounded.
10. The power adjustable limiter capable of maintaining a state according to claim 8, characterized in that, The switch limiting diodes V2 and V3 are high voltage withstand limiting diodes.