CN109412622B - Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout - Google Patents
Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout Download PDFInfo
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- CN109412622B CN109412622B CN201811446234.3A CN201811446234A CN109412622B CN 109412622 B CN109412622 B CN 109412622B CN 201811446234 A CN201811446234 A CN 201811446234A CN 109412622 B CN109412622 B CN 109412622B
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- radio frequency
- switch
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- distribution module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Transmitters (AREA)
Abstract
The invention discloses a radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout, which comprises a radio frequency channel circuit, a limiter, an antenna, a power distribution module, a detector, a switch and a switch control circuit, wherein one end of the switch is connected with the front end of the radio frequency channel circuit, the other end of the switch is grounded, the input end of the power distribution module is connected with the output end of a previous stage radio frequency component, the first output end of the power distribution module is connected with the input end of a next stage radio frequency component, the second output end of the power distribution module is connected with the input end of the detector, the output end of the detector is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the switch. The circuit can solve the problem of pulse wave breakdown and continuous wave burnout, has a simple structure, can effectively control the cost, and can well protect the analog-to-digital converter.
Description
Technical Field
The invention relates to the field of radio frequency circuit protection, in particular to a radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout.
Background
The front end of the wideband receiver is usually provided with a radio frequency circuit consisting of a low noise amplifier, a mixer and an intermediate frequency amplifier, when a high-power interference signal exists near the receiver or the receiver participates in electronic countermeasure, the device breakdown and even burnout can be caused, so that the receiver is disabled, and the improvement of the protection capability of the receiver plays an important role in the design of the receiver. The conventional radio frequency protection circuits are divided into two types, a protection circuit using a single limiter and a protection circuit using a plurality of limiters.
As shown in FIG. 1, a protection circuit adopting a single limiter is provided, a single limiter is added at the input front end of the low noise amplifier, so that the sharp pulse wave power can be limited to about 15dBm, the pulse peak is effectively reduced, and the instantaneous ultra-high input pulse is prevented from breaking down the first stage low noise amplifier. A single limiter can effectively resist sharp pulse waves, but cannot resist continuous waves, and usually the limiter can only limit the amplitude to about 15dBm, after the amplitude passes through a low-noise amplifier, the amplitude can be amplified, and although the output amplitude is limited by the saturated output power of the low-noise amplifier, the output amplitude of the amplifier usually exceeds the maximum input amplitude allowed by a rear-stage active device, so that the rear-stage active device is burnt.
If the problem of continuous wave burnout is to be solved, a protection circuit with a plurality of limiters is usually adopted, as shown in fig. 2, a limiter is added to the input end of each radio frequency active device, so that the input power of each active device in the radio frequency circuit cannot exceed the allowable maximum input range, pulse waves and continuous waves are effectively resisted, but the radio frequency channel is provided with four to five active devices, and four to five limiters are also required to be added, thus the volume of the radio frequency circuit is doubled, the cost is obviously increased, the end of the radio frequency channel is next to an analog-digital converter (ADC), the allowable maximum input power of the device is not more than 10dBm, and the limiters on the market generally limit the signal to 15dBm at present, so that the limiters cannot well protect the analog-digital converter.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a radio frequency protection circuit which can not only resist pulse wave breakdown and continuous wave burnout, but also protect an analog-to-digital converter, and has low cost and simple structure.
The technical scheme adopted by the invention is as follows:
the utility model provides a radio frequency protection circuit of anti pulse wave breakdown and continuous wave burnout, includes the radio frequency channel circuit that sets up between antenna and analog-to-digital converter, sets up the limiter in radio frequency channel circuit front end, and the radio frequency channel circuit comprises a plurality of radio frequency components and parts, still includes power distribution module, detector, switch and switch control circuit, the one end of switch links to each other with radio frequency channel circuit front end, and the other end ground of switch, power distribution module sets up between arbitrary two radio frequency components and parts in the radio frequency channel circuit, and the input of power distribution module links to each other with the output of preceding stage radio frequency components and parts, and the first output of power distribution module links to each other with the input of following stage radio frequency components and parts, and the second output of power distribution module links to each other with the input of detector, the output of detector links to each other with the input of switch control circuit, and the output of switch control circuit links to each other with the control end of switch.
Further, the power distribution module is a coupler or a power divider.
Further, the switch control circuit comprises a diode and a capacitor, the output end of the detector is connected with the positive electrode of the diode, the negative electrode of the diode is connected with the control end of the switch, and the common end of the diode and the switch is grounded through the capacitor.
Further, the switch is a radio frequency switch.
The invention has the beneficial effects that:
the invention solves the problem of anti-pulse wave breakdown through the amplitude limiter, the rear end of the amplitude limiter is connected with a switch to ground, when the radio frequency channel circuit works normally, the switch is in an open state, a part of signal energy is split by the power distribution module arranged in the radio frequency channel circuit and sent to the detector, when the detector detects that a larger signal enters the radio frequency channel circuit, the detector outputs direct current voltage to the switch control circuit, the switch control circuit closes the switch, the signal is short-circuited to ground, and the later-stage circuit is protected from being burnt, and the invention has the following advantages:
1. the invention can solve the problem of pulse wave breakdown and the problem of continuous wave burnout.
2. The circuit structure is simple, and the cost can be effectively controlled.
3. The amplitude can be limited in an allowable input range by using the detection plus closed-loop control circuit, and the radio frequency device and the terminal analog-digital converter can be well protected.
4. The detection and control time is short, and the time from the interference signal entering the radio frequency channel to the switch closing can be controlled within 50 ns.
5. With the loop control technique, no additional controller is required to control the state of the switch.
Drawings
Fig. 1 is a schematic diagram of a radio frequency protection circuit for a single limiter;
FIG. 2 is a schematic diagram of a radio frequency protection circuit for a plurality of limiters;
fig. 3 is a schematic diagram of a radio frequency protection circuit of the present invention that is resistant to pulse wave breakdown and continuous wave burnout.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
As shown in fig. 3, the radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout of the present invention includes a radio frequency channel circuit disposed between an antenna and an analog-to-digital converter, and a limiter disposed at an input front end of the radio frequency channel circuit, where in this embodiment, the radio frequency channel circuit includes two low noise amplifiers, a mixer, a filter, and two intermediate frequency amplifiers that are sequentially connected, the protection circuit further includes a power distribution module 1, a detector 2, a switch 3, and a switch control circuit, and preferably, the power distribution module 1 is a coupler or a power divider, the switch 3 is a radio frequency switch, and the switch control circuit includes a diode 4 and a capacitor 5.
One end of the switch 3 is connected to an input end of a low noise amplifier at a front end of the radio frequency channel circuit, the other end of the switch 3 is grounded, the coupler/power divider is arranged between any two radio frequency components in the radio frequency channel circuit, in this embodiment, the input end of the coupler/power divider is connected to an output end of the low noise amplifier, a first output end of the coupler/power divider is connected to an input end of the mixer, the coupler/power divider can be arranged between the mixer and the filter, or between the filter and the intermediate frequency amplifier, a second output end of the coupler/power divider is connected to an input end of the detector 2, an output end of the detector 2 is connected to an anode of the diode 4, a cathode of the diode 4 is connected to a control end of the switch 3, a common end of the diode 4 is grounded through the capacitor 5, and of course, the switch control circuit can also adopt a switch control circuit composed of other components.
The working principle of the invention is as follows:
when the radio frequency channel circuit works normally, the switch is in an off state.
When the relatively sharp pulse wave interference enters the radio frequency channel, the amplitude limiter limits the input amplitude to about 15dBm, and the breakdown of the first-stage low-noise amplifier cannot be caused.
When a continuous wave interference signal enters the radio frequency channel and the duration exceeds 10ns, the detector detects that a larger signal enters the radio frequency channel, so that a direct current voltage related to the amplitude of the interference signal is output, the voltage enables the diode to be conducted, the capacitor is charged, and after the capacitor is charged, a high level is generated to enable the switch to be closed, so that the amplitude of the signal entering the radio frequency channel is greatly reduced (the interference signal is short-circuited). Because the diode and the control pin of the switch are both high-resistance, the capacitor discharges slowly, so that the switch is continuously closed, and even after a period of time, the switch is opened, and if an interference signal still exists at the moment, the next detection and control period is entered, and the cycle is performed.
The circuit has the advantages that the reaction time from the interference signal entering the radio frequency channel until the switch is closed is less than 50ns, the energy entering the radio frequency channel is small, and the burning of the later-stage active devices can be avoided.
The invention solves the problem of anti-pulse wave breakdown through the amplitude limiter, the rear end of the amplitude limiter is connected with a switch to ground, when the radio frequency channel circuit works normally, the switch is in an open state, a part of signal energy is split by the power distribution module arranged in the radio frequency channel circuit and sent to the detector, when the detector detects that a larger signal enters the radio frequency channel circuit, the detector outputs direct current voltage to the switch control circuit, the switch control circuit closes the switch, the signal is short-circuited to ground, and the later-stage circuit is protected from being burnt, and the invention has the following advantages:
1. the invention can solve the problem of pulse wave breakdown and the problem of continuous wave burnout.
2. The circuit structure is simple, and the cost can be effectively controlled.
3. The amplitude can be limited in an allowable input range by using the detection plus closed-loop control circuit, and the radio frequency device and the terminal analog-digital converter can be well protected.
4. The detection and control time is short, and the time from the interference signal entering the radio frequency channel to the switch closing can be controlled within 50 ns.
5. With the loop control technique, no additional controller is required to control the state of the switch.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent changes made by the description of the invention and the accompanying drawings, or direct or indirect application in the relevant art, are intended to be included within the scope of the invention.
Claims (4)
1. The utility model provides a radio frequency protection circuit of anti pulse wave breakdown and continuous wave burnout, includes the radio frequency channel circuit that sets up between antenna and analog-to-digital converter, sets up the limiter at the radio frequency channel circuit input front end, and the radio frequency channel circuit comprises a plurality of radio frequency components and parts, its characterized in that: the power distribution device is characterized by further comprising a power distribution module (1), a detector (2), a switch (3) and a switch control circuit, wherein one end of the switch (3) is connected with the input front end of the radio frequency channel circuit, the other end of the switch (3) is grounded, the power distribution module (1) is arranged between any two radio frequency components in the radio frequency channel circuit, the input end of the power distribution module (1) is connected with the output end of the previous stage radio frequency component, the first output end of the power distribution module (1) is connected with the input end of the next stage radio frequency component, the second output end of the power distribution module (1) is connected with the input end of the detector (2), the output end of the detector (2) is connected with the input end of the switch control circuit, and the output end of the switch control circuit is connected with the control end of the switch (3).
2. The radio frequency protection circuit of claim 1, wherein: the power distribution module (1) is a coupler or a power divider.
3. The radio frequency protection circuit of claim 1, wherein: the switch control circuit comprises a diode (4) and a capacitor (5), wherein the output end of the detector (2) is connected with the positive electrode of the diode (4), the negative electrode of the diode (4) is connected with the control end of the switch (3), and the common end of the diode (4) and the switch (3) is grounded through the capacitor (5).
4. The radio frequency protection circuit of claim 1, wherein: the switch (3) is a radio frequency switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446234.3A CN109412622B (en) | 2018-11-29 | 2018-11-29 | Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811446234.3A CN109412622B (en) | 2018-11-29 | 2018-11-29 | Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout |
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| Publication Number | Publication Date |
|---|---|
| CN109412622A CN109412622A (en) | 2019-03-01 |
| CN109412622B true CN109412622B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811446234.3A Active CN109412622B (en) | 2018-11-29 | 2018-11-29 | Radio frequency protection circuit for resisting pulse wave breakdown and continuous wave burnout |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115102570B (en) * | 2020-07-03 | 2023-11-17 | 加特兰微电子科技(上海)有限公司 | Intermediate frequency analog circuit, analog baseband circuit, and radio signal transmitting/receiving device |
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| CN109412622A (en) | 2019-03-01 |
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