CN220254469U - Over-transmission protection device and power amplifier device based on electrically-controlled attenuator - Google Patents
Over-transmission protection device and power amplifier device based on electrically-controlled attenuator Download PDFInfo
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- CN220254469U CN220254469U CN202321616751.7U CN202321616751U CN220254469U CN 220254469 U CN220254469 U CN 220254469U CN 202321616751 U CN202321616751 U CN 202321616751U CN 220254469 U CN220254469 U CN 220254469U
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Abstract
The utility model discloses an over-transmission protection device and a power amplifier device based on an electrically-controlled attenuator. The power amplifier device comprises a power amplifier and an over-output protection device before the power amplifier is arranged. The over-transmission protection device comprises a power divider, an electric adjustment attenuator and a detection feedback device. The detection feedback device comprises a detector and an adaptation circuit. The input of the power amplifier device is firstly connected with a power divider, the power divider unevenly divides an input radio frequency signal into two paths, one path of the input radio frequency signal is input to the electrically-controlled attenuator, the other path of the input radio frequency signal is input to the detector, the detector converts the input radio frequency signal into a current signal, and the adaptive circuit modulates the current signal output by the detector into a control signal adaptive to the control end of the electrically-controlled attenuator. Therefore, when the power of the radio frequency signal input by the power amplifier device is overlarge, the attenuation amount of the electrically-controlled attenuator is automatically adjusted, so that the radio frequency signal input to the power amplifier does not exceed the rated power range of the power amplifier, and the power amplifier is protected.
Description
Technical Field
The utility model relates to over-input protection for radio frequency power amplifiers.
Background
In the field of electronic testing, such as electromagnetic compatibility testing, electronic countermeasure testing, automotive electronic testing, and the like, a radio frequency power amplifier is one of the core necessary components of a test system. When the test system is used for testing, the load of the radio frequency power amplifier is larger due to the relation of test requirements. Particularly, when the limit environment test is performed, the radio frequency power amplifier is often required to work in a high power state for a long time, and the input signal power of the radio frequency power amplifier easily reaches and exceeds the rated working range, so that the radio frequency power amplifier enters a deep saturation output state. In this long-time deep saturated output state of the radio frequency power amplifier caused by the overinput, the radio frequency power amplifier is easily damaged irreversibly. For example, in the electromagnetic compatibility test performed by the applicant, the damage rate of the radio frequency power amplifier in the test system is high.
Disclosure of Invention
The utility model aims to solve the problems that: over-input protection for radio frequency power amplifiers.
In order to solve the problems, the utility model adopts the following scheme:
an over-transmission protection device based on an electrically tunable attenuator, comprising:
the over-transmission protection device based on the electrically-controlled attenuator comprises:
the power divider is used for dividing an input radio frequency signal into at least two paths of outputs, and the input of the power divider is the input of the over-transmission protection device;
the input of the electric adjustment attenuator is connected with one output of the power divider, and the output of the electric adjustment attenuator is the output of the over-output protection device;
and the detection feedback device is connected with the other output of the power divider, and the output of the detection feedback device is connected with the control end of the electric tuning attenuator and is used for modulating the received radio frequency signal into the control signal of the electric tuning attenuator so as to adjust the attenuation value of the electric tuning attenuator, so that when the signal input by the power divider is larger, the attenuation amount of the electric tuning attenuator is larger.
Further, according to the over-transmission protection device of the present utility model, the detection feedback device includes a detector and an adaptation circuit; the input of the detector is connected with the output of the power divider, and the output of the detector is connected with the adaptive circuit and is used for converting the radio frequency signal output by the power divider into a current signal or a voltage signal and outputting the current signal or the voltage signal to the adaptive circuit; the input of the adapting circuit is connected with the output of the detector, and the output of the adapting circuit is connected with the control end of the electrically-controlled attenuator and is used for adapting the current or voltage signal output by the detector to the working range of the control end of the electrically-controlled attenuator.
Further, according to the over-transmission protection device, the electric regulation attenuator is an attenuator regulated and controlled based on current input.
Further, according to the over-transmission protection device, the electric regulation attenuator is an attenuator regulated and controlled based on voltage input.
Further, according to the over-transmission protection device, the electric regulation attenuator is an attenuator which is regulated and controlled based on current input; the adaptive circuit is a current modulation circuit and is used for modulating a current signal or a voltage signal output by the detector to a current signal which accords with the current input working range of the control end of the electrically-controlled attenuator.
Further, according to the over-transmission protection device, the electric regulation attenuator is an attenuator regulated and controlled based on voltage input; the detector is a detection tube and is used for converting an input radio frequency signal into a voltage signal; the adaptive circuit is a voltage conversion module and is used for modulating the voltage signal output by the detection tube to a voltage signal which accords with the current input working range of the control end of the electrically-controlled attenuator.
Further, according to the over-transmission protection device of the utility model, the power divider is an uneven power divider, wherein the power of the radio frequency signal output to the electrically-controlled attenuator accounts for 70% -90% of the input power.
The power amplifier device with the over-input protection comprises a power amplifier and the over-input protection device; the output of the electrically tunable attenuator in the over-output protection device is connected to the input of the power amplifier.
The utility model has the following technical effects:
the utility model constructs a negative feedback radio frequency signal circuit through the power divider, the electric tuning attenuator and the detection feedback device, and when the power of the input signal is increased, the attenuation of the electric tuning attenuator is automatically adjusted, so that the radio frequency signal power input to the power amplifier is not excessively large, and the purpose of protecting the power amplifier is achieved.
Compared with a common protection circuit, the over-transmission protection device does not introduce elements such as capacitance, inductance and the like on the main circuit of the radio frequency signal, and the introduced capacitance increment is negligible, so that the over-transmission protection device has a large working radio frequency range, and has strong adaptability no matter low frequency, medium frequency and high frequency.
The radio frequency working frequency of the over-transmission protection device depends on the working frequency range of the electrically-controlled attenuator, and the electrically-controlled attenuator can have a large working frequency range, for example, according to the embodiment of the utility model, the working frequency range is DC-60 GHz, and correspondingly, the working frequency range of the over-transmission protection device is DC-60 GHz.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the power amplifier device of the present utility model.
FIG. 2 is a pin diagram of an electrically tunable attenuator model NT2002T used in an embodiment of the present utility model.
Wherein 1 is an over-transmission protection device, 11 is a power divider, 12 is an electrically-controlled attenuator, 13 is a detection feedback device, 131 is a detector, and 132 is an adaptation circuit; 2 is a power amplifier.
Description of the embodiments
The utility model is described in further detail below with reference to the accompanying drawings.
Fig. 1 illustrates a power amplifier device for amplifying radio frequency signal power, and a signal generated after an input terminal is connected to a signal source is used for constructing an electromagnetic radiation environment in an electromagnetic compatibility test. The power amplifier device comprises an over-output protection device 1 and a power amplifier 2. The power amplifier 2 is a radio frequency power amplifier.
The over-transmission protection device 1 is an over-transmission protection device based on an electrically-controlled attenuator and is used for protecting the power amplifier 2 when the input end of the over-transmission protection device is over-powered by the radio frequency signal, so as to protect the power amplifier 2 from being damaged due to the over-power input of the radio frequency signal. The over-transmission protection device 1 comprises a power divider 11, an electrically tunable attenuator 12 and a detection feedback device 13.
The input end of the power divider 11 is the input end of the over-transmission protection device 1 and is also the input end of the power amplifier device. The power divider 11 has two outputs, denoted a and B, respectively. Wherein, output end A of power divider 11 connects the input end of electrically adjustable attenuator 12, and output end B connects the input end of detecting feedback device 13. That is, the power divider 11 is configured to divide the radio frequency signal input at the input terminal into two outputs: one output is sent to the electrically tunable attenuator 12, and the other output is sent to the detection feedback device 13.
The electrically tunable attenuator 12 includes an input, an output, and a control. The input of the input end of the electrically tunable attenuator 12 is connected to the output of one output end of the power divider 11, specifically, in the example of fig. 1, to the output end a of the power divider 11. The output end of the electrically-controlled attenuator 12 is connected with the input end of the power amplifier 2, and the output end of the electrically-controlled attenuator is the output of the over-output protection device 1, and the output of the electrically-controlled attenuator is the attenuated radio frequency signal. The control end of the electric tuning attenuator 12 is connected with the output of the detection feedback device 13. The electrically tunable attenuator 12 is used for attenuation of radio frequency signals. Specifically, the electrically tunable attenuator 12 is configured to tune the attenuation value under the control of the control signal input at the control terminal thereof, so that the radio frequency signal power input through the power divider 11 is output to the power amplifier 2 after being suitably attenuated to meet the rated operating range of the power amplifier 2.
The detection feedback device 13 comprises an input end and an output end. The input of the detection feedback means 13 is connected to the other output of the power divider 11, in particular to the output B of the power divider 11 in the example of fig. 1. The output end of the detection feedback device 13 is connected with the control end of the electrically-controlled attenuator 12. The radio frequency signal received by the detection feedback device 13 is modulated into the control signal of the electrically tunable attenuator 12 to tune the attenuation value of the electrically tunable attenuator 12, so that the greater the radio frequency signal power input by the power divider 11, the greater the attenuation amount of the electrically tunable attenuator 12.
In this embodiment, the detection feedback device 13 includes a detector 131 and an adaptation circuit 132. The input of the detector 131 is the input of the detection feedback device 13, and is connected with the output of the power divider 11; the output of the detector 131 is connected to an adaptation circuit 132. An input of the adaptation circuit 132 is connected to an output of the detector 131; the output of the detection feedback device 13 is connected with the control end of the electrically tunable attenuator 12. The detector 131 is configured to convert the radio frequency signal output by the output terminal B of the power divider 11 into a current signal or a voltage signal, and output the current signal or the voltage signal to the adapting circuit 132, where the adapting circuit 132 is configured to adapt the current signal or the voltage signal output by the detector 131 to the operating range of the control terminal of the electrically tunable attenuator 12 as the control signal of the electrically tunable attenuator 12.
In this embodiment, the electrically tunable attenuator 12 is an electrically tunable attenuator of model NT 2002T. The electric tuning attenuator is an integrated circuit chip, is a broadband electric tuning attenuator, and has a working range of DC-60 GHz and an insertion loss typical value of 3.0 dB. Referring to fig. 2, the electrically tunable attenuator chip is provided with pins RFin, RFout, V1 and V2. Wherein, pin RFin is the input terminal, RFout is the output terminal, and pins V1 and V2 are the control terminals. Along with the voltage change of the pins V1 and V2, the power attenuation value of the radio frequency signal outputted from the input end pin RFin to the output end pin RFout changes, and the attenuation range is 0 dB-15 dB. When the electrically tunable attenuator is actually assembled in this embodiment, the pin V1 is grounded, the pin V2 is connected to the output end of the adapter circuit 132, and the working range of the pin V2 is-0.8V-0V. When the voltage input by the pin V2 is changed from-0.8V to 0V, the output attenuation is 0 to 15dB. The detector 131 adopts a detector tube, the radio frequency signal split by the power divider 11 is converted into a direct current voltage signal after passing through the detector 131, and when the power of the input radio frequency signal is larger, the voltage signal output by the detector 131 is also larger. The adapting circuit 132 is a voltage conversion module, that is, modulates the voltage signal output by the detector 131 to a voltage signal that meets the current input operating range of the control end of the electrically tunable attenuator 12, specifically, in this embodiment, modulates the voltage signal output by the detector 131 to a negative voltage signal, and modulates the negative voltage signal to a operating range of-0.8 v to 0v. That is, the working principle of the present embodiment is as follows,
when the power of the radio frequency signal input by the power divider 11 is larger, the power of the radio frequency signal output by the power divider 11 to the detector 131 is correspondingly larger, the voltage output by the detector 131 is correspondingly larger, and the control voltage input by the tone attenuator 12 is correspondingly larger, so that the output attenuation amount is also larger. Thus, as the power of the input radio frequency signal is continuously increased, the signal attenuation is correspondingly increased, so that the power of the radio frequency signal output by the output protection device 1 is kept unchanged, and the safety of the input signal of the power amplifier is ensured.
The electrically tunable attenuator 12 in this embodiment performs attenuation adjustment according to the voltage variation input by the control terminal pin V1V2, that is, the electrically tunable attenuator 12 in this embodiment is an attenuator that performs tuning based on voltage input. Those skilled in the art understand that there are attenuators that are regulated, for example, based on current input, in addition to those that are regulated based on voltage input. Based on the above technical solution of the present embodiment, a person skilled in the art may equivalently replace the attenuator that adjusts and controls based on the voltage input with an attenuator that adjusts and controls based on the current input, and accordingly, the adapting circuit 132 needs to correspondingly replace the current signal or the voltage signal output by the detector tube with a current signal that conforms to the current input working range of the control end of the electrically adjustable attenuator.
In this embodiment, the detector 131 converts the radio frequency signal into a dc voltage signal, and in another embodiment, the detector 131 may be replaced with a detector that converts the radio frequency signal into a dc voltage signal. Under the detector, the larger the power of the input radio frequency signal is, the larger the output direct current is. At this time, the adapting circuit 132 needs to modulate the current signal output from the detector into a voltage control signal or a current control signal that needs to be input to the control terminal of the electrically tunable attenuator 12.
In addition, in the present embodiment, the power divider 11 is an unequal power divider, that is, the power of the rf signals at the output terminal a and the output terminal B are unequal. The output of the output terminal a, i.e. the rf signal power output to the electrically tunable attenuator 12, is typically 70% -90%, preferably 80% of its input.
In addition, in this embodiment, the power divider 11 is a one-to-two power divider, and in some application cases, the power divider 11 may be a one-to-three or one-to-four power divider, so long as one path of output is ensured to the electrically tunable attenuator 12, and one path of output is ensured to the detection feedback device 13, so that the effect of other path of output of the power divider is not in the scope of the present utility model.
In addition, in order to reduce the insertion loss of the over-transmission protection device 1, in this embodiment, the output terminal a of the power divider 11 is connected to the input terminal of the electrically tunable attenuator 12 by using a coaxial cable.
Furthermore, it will be appreciated by those skilled in the art that, on the one hand, the actual configuration of the adaptation circuit 132 is related to the nominal radio frequency signal input power actually received by the power amplifier 2, and also to the power division ratio of the power divider 11; on the other hand, the signal conversion adapting circuit is familiar to those skilled in the art, and the specific structure of the adapting circuit 132 will not be described in detail in this specification.
Claims (8)
1. Over-transmission protection device based on electrically tunable attenuator, characterized by comprising:
the power divider is used for dividing an input radio frequency signal into at least two paths of outputs, and the input of the power divider is the input of the over-transmission protection device;
the input of the electric adjustment attenuator is connected with one output of the power divider, and the output of the electric adjustment attenuator is the output of the over-output protection device;
and the detection feedback device is connected with the other output of the power divider, and the output of the detection feedback device is connected with the control end of the electric tuning attenuator and is used for modulating the received radio frequency signal into the control signal of the electric tuning attenuator so as to adjust the attenuation value of the electric tuning attenuator, so that when the signal input by the power divider is larger, the attenuation amount of the electric tuning attenuator is larger.
2. The over-transmission protection device of claim 1, wherein the detection feedback device comprises a detector and an adaptation circuit; the input of the detector is connected with the output of the power divider, and the output of the detector is connected with the adaptive circuit and is used for converting the radio frequency signal output by the power divider into a current signal or a voltage signal and outputting the current signal or the voltage signal to the adaptive circuit; the input of the adapting circuit is connected with the output of the detector, and the output of the adapting circuit is connected with the control end of the electrically-controlled attenuator and is used for adapting the current or voltage signal output by the detector to the working range of the control end of the electrically-controlled attenuator.
3. The over-voltage protection device of claim 1, wherein the electrically-controlled attenuator is an attenuator that is controlled based on a current input.
4. The over-transmission protection device of claim 1, wherein the electrically-controlled attenuator is an attenuator that is controlled based on a voltage input.
5. The over-transmission protection device according to claim 2, wherein the electrically-controlled attenuator is an attenuator controlled based on a current input; the adaptive circuit is a current modulation circuit and is used for modulating a current signal or a voltage signal output by the detector to a current signal which accords with the current input working range of the control end of the electrically-controlled attenuator.
6. The over-transmission protection device according to claim 2, wherein the electrically-controlled attenuator is an attenuator controlled based on a voltage input; the detector is a detection tube and is used for converting an input radio frequency signal into a voltage signal; the adaptive circuit is a voltage conversion module and is used for modulating the voltage signal output by the detection tube to a voltage signal which accords with the current input working range of the control end of the electrically-controlled attenuator.
7. The over-transmission protection device according to any one of claims 1 to 6, wherein the power divider is an uneven power divider, and wherein the rf signal power output to the electrically tunable attenuator is 70% -90% of the input power.
8. Power amplifier device characterized by comprising a power amplifier and an over-output protection device according to any of claims 1 to 7; the output of the electrically tunable attenuator in the over-output protection device is connected to the input of the power amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321616751.7U CN220254469U (en) | 2023-06-25 | 2023-06-25 | Over-transmission protection device and power amplifier device based on electrically-controlled attenuator |
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| CN202321616751.7U CN220254469U (en) | 2023-06-25 | 2023-06-25 | Over-transmission protection device and power amplifier device based on electrically-controlled attenuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117579008A (en) * | 2024-01-17 | 2024-02-20 | 南京纳特通信电子有限公司 | Overload signal prevention automatic adjusting device and adjusting method for power amplifier system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117579008A (en) * | 2024-01-17 | 2024-02-20 | 南京纳特通信电子有限公司 | Overload signal prevention automatic adjusting device and adjusting method for power amplifier system |
| CN117579008B (en) * | 2024-01-17 | 2024-04-02 | 南京纳特通信电子有限公司 | Overload signal prevention automatic adjusting device and adjusting method for power amplifier system |
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