CN213072623U - Protection circuit of transmitting device, transmitting circuit and terminal - Google Patents
Protection circuit of transmitting device, transmitting circuit and terminal Download PDFInfo
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- CN213072623U CN213072623U CN202021566106.5U CN202021566106U CN213072623U CN 213072623 U CN213072623 U CN 213072623U CN 202021566106 U CN202021566106 U CN 202021566106U CN 213072623 U CN213072623 U CN 213072623U
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Abstract
The utility model provides a protection circuit, a transmitting circuit and a terminal of a transmitting device, which are characterized in that a current detection module is arranged to detect a transmitting current signal of a Power Amplifier (PA) in the transmitting device and compare the transmitting current signal with a reference current signal to judge whether a harmful antenna mismatch condition exists or not; when the emission current signal exceeds the reference current signal, the comparison module outputs an adjustment instruction to adjust the feedback gain of a negative feedback channel of the emission device, so that the emission current signal of the emission device is reduced, and the normal work of the emission device is guaranteed; the process is simple and convenient, a switching matching circuit is not required to be arranged, excessive PCB space is avoided, and miniaturization of a terminal product is facilitated; meanwhile, processor software is not required to be arranged for switching control, and devices required by the implementation process are small and easy to obtain, so that the feasibility is high; the problem of adopt the switching matching method to solve among the prior art and mismatch the antenna of wireless transmitting device and exist and restrict the miniaturization of terminal product and the feasibility is low is solved.
Description
Technical Field
The utility model relates to a terminal equipment technical field, in particular to emitter protection circuit, transmitting circuit and terminal.
Background
With the development of communication technology, the application of wireless transmitters is receiving wide attention. In some application occasions of a wireless transmitter, especially in a handheld terminal, when an external antenna is close to a human body or a metal object, the antenna is in a mismatch state, which causes a load change of a Power Amplifier (PA), and a current of a transmitting PA changes accordingly, which causes a current to rise sharply in a severe case, and a voltage provided by a battery decreases correspondingly, even the battery is shut down protectively, which causes a mobile device to stop working.
In the prior art, a method of switching matching is usually adopted to solve the problem of antenna mismatch in a wireless transmitter, as shown in fig. 1, a switching panel 101 is provided to select a suitable antenna for configuration according to a current terminal placement state, signal quality or strength change. However, when there are more antennas to be matched, the switching panel 101 used in the antenna is very large, that is, more PCB (Printed Circuit Board) space is required on hardware, which severely limits the miniaturization of the terminal product; and the switching scheme is cumbersome and bloated, so that the handheld terminal device which is powered by a battery and limited in size is not provided with enough PCB position to realize the switching scheme, and the feasibility is low.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a protection circuit for a transmitting device, a transmitting circuit and a terminal, so as to solve the problem in the prior art that the antenna mismatch of the wireless transmitting device is solved by adopting a switching matching method, and the miniaturization and low feasibility of the limited terminal product are low.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the utility model discloses a first aspect provides a transmitting device protection circuit, include: the device comprises a current detection module, a comparison module, a reset module and an adjustable attenuation module; wherein:
the input end of the current detection module is connected with the emission current detection position of a Power Amplifier (PA) in the emission device, and the output end of the current detection module is connected with one input end of the comparison module;
the other input end of the comparison module is connected with the output end of a digital-to-analog converter (DAC) in the transmitting device and receives a reference current signal; the output end of the comparison module is connected with the control end of the adjustable attenuation module and outputs an adjustment instruction;
the output end of the reset module is connected with the reset end of the comparison module;
the adjustable attenuation module is arranged in a negative feedback channel of the transmitting device.
Optionally, an input end of the adjustable attenuation module is used as an input end of the negative feedback channel;
and the output end of the adjustable attenuation module is connected with the input end of the numerical control attenuator on the negative feedback channel.
Optionally, the current detection module is: the current collecting resistor is connected in series with a power supply line of the PA; or a current collecting chip.
Optionally, the comparison module is an operational amplifier or a comparator.
Optionally, the adjustable attenuation module is an adjustable attenuator.
The utility model discloses a second aspect provides a transmitting circuit, include: the Digital to analog converter comprises a signal transmission branch circuit, a PA (power amplifier), an output matching module, a Digital control attenuator, a processor, a DAC (Digital to analog converter) and any one of the transmitting device protection circuits; wherein:
the input end of the signal transmission branch receives an input signal to be transmitted;
the negative feedback end of the signal transmission branch circuit is connected with the output end of the negative feedback channel; the numerical control attenuator is arranged in the negative feedback channel;
the output end of the signal transmission branch circuit is connected with the input end of the PA;
the output end of the PA is connected with the input end of the output matching module;
one output end of the output matching module is used as the output end of the transmitting circuit;
the other output end of the output matching module is connected with the input end of the negative feedback channel;
the output end of the processor is respectively connected with the control end of the numerical control attenuator and the input end of the DAC;
and the output end of the DAC outputs a reference current signal.
Optionally, the output matching module includes: a load matching circuit and a directional coupler;
the input end of the load matching circuit is used as the input end of the output matching module;
the output end of the load matching circuit is connected with the input end of the directional coupler;
the through end of the directional coupler is used as the output end of the transmitting circuit;
and the coupling end of the directional coupler is connected with the input end of the negative feedback channel.
Optionally, the first output end of the processor is connected to the control end of the numerical control attenuator;
the second output terminal of the processor outputting the reference current data to the input terminal of the DAC comprises: a first processor and a second processor; wherein:
the output end of the first processor is connected with the control end of the numerical control attenuator;
and the output end of the second processor is connected with the input end of the DAC.
The utility model discloses the third aspect provides a terminal, include: a housing, a transmitting antenna, a battery, and any of the transmitting circuits described above; wherein:
the transmitting circuit is arranged inside the shell;
the transmitting antenna is arranged outside the shell, and a signal receiving end of the transmitting antenna is connected with an output end of the transmitting circuit;
the battery is arranged in the battery groove of the shell and is connected with the power supply end of the transmitting circuit.
Optionally, the method further includes: the device comprises a receiving antenna, a receiving circuit and an external device; wherein:
the input end of the receiving circuit is connected with the signal output end of the receiving antenna;
and the output end of the receiving circuit is connected with the input end of the external amplifying device.
The utility model provides a protection circuit of a transmitter, which is characterized in that a current detection module is arranged to detect the transmitting current signal of a Power Amplifier (PA) in the transmitter and compare the transmitting current signal with a reference current signal to judge whether a harmful antenna mismatch condition exists; when the emission current signal exceeds the reference current signal, the comparison module outputs an adjustment instruction to adjust the feedback gain of a negative feedback channel of the emission device, so that the emission current signal of the emission device is reduced, and the normal work of the emission device is guaranteed; the process is simple and convenient, a switching matching circuit is not required to be arranged, excessive PCB space is avoided, and miniaturization of a terminal product is facilitated; meanwhile, processor software is not required to be arranged for switching control, and devices required by the implementation process are small and easy to obtain, so that the feasibility is high; the problem of adopt the switching matching method to solve among the prior art and mismatch the antenna of wireless transmitting device and exist and restrict the miniaturization of terminal product and the feasibility is low is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art solution;
fig. 2 is a schematic structural diagram of a protection circuit of a transmitting device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmitting circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 6 is another schematic structural diagram of a transmitting circuit according to an embodiment of the present invention;
fig. 7 is a waveform diagram of a simulation process of a transmitting circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The problem that the transmitter works abnormally due to sudden mismatching of an antenna when the existing individual mobile handheld equipment is in a transmitting state is particularly obvious in equipment powered by low voltage and large current, and even the situation that the peak value fluctuation of the current exceeds the maximum allowable current of a battery is directly caused, so that the battery is protected, and the output is closed; in particular, when the battery is not protected, the machine is halted due to a severe voltage drop, so that the machine must be powered off and then powered on before use. However, the method for solving the antenna mismatch in the wireless transmitter by adopting the switching matching in the prior art is not suitable for the handheld terminal equipment with limited volume and battery power supply.
Based on this, the utility model provides a transmitting device protection circuit to adopt among the solution prior art to switch the matching method and solve wireless transmitting device's antenna mismatch and the problem that the miniaturization and the feasibility of the restriction terminal product that exist are low.
Referring to fig. 2, the transmitting device protection circuit includes: the device comprises a current detection module 201, a comparison module 202, a reset module 203 and an adjustable attenuation module 204; wherein:
the input end of the current detection module 201 is connected to the transmission current detection position of the power amplifier PA 205 in the transmission apparatus, and the output end of the current detection module 201 is connected to one input end of the comparison module 202.
Optionally, the current detection module 201 may be a dedicated current collection chip, or may be a current collection resistor connected in series to the power supply line of the PA 205, where both of them can implement the conversion from current to voltage, and the current collection chip outputs the collected voltage to the corresponding input terminal of the comparison module 202, or the differential mode voltage at both ends of the current collection resistor is sent to the corresponding input terminal of the comparison module 202; of course, the selection of the current detection module is not limited to this, and a dedicated current detection chip may also be adopted, and in practical applications, the device that can implement current signal detection is selected according to specific situations, and is all within the protection scope of the present application.
The other input end of the comparing module 202 is connected with the output end of the digital-to-analog converter DAC 206 in the transmitting device, and receives the reference current signal Iref; the output end of the comparison module 202 is connected to the control end of the adjustable attenuation module 204, and outputs an adjustment instruction.
Optionally, the comparing module 202 is an operational amplifier or a comparator, but is not limited thereto and may be configured according to specific situations.
It should be noted that the reference current signal Iref may be manually set, for example, a minimum current value that the transmitting device may generate mismatch is obtained by manual calculation, and is directly set in a processor of the transmitting device; or automatically setting, for example, automatically recognizing the minimum analog signal (such as human voice) which can generate mismatch by the transmitting device by the processor, and then converting and transmitting by the digital-to-analog converter; of course, the setting of the reference current signal Iref can be set according to practical application without being limited thereto.
The adjustment instruction is output by the comparing module 202, and may be set according to a specific application environment, such as an instruction including a high-low level value, which is not specifically limited herein, and the instruction that the adjustable attenuation module 204 is adjusted may be implemented within the protection scope of the present application.
The output end of the reset module 203 is connected to the reset end of the comparison module 202, and after the comparison module 202 outputs the adjustment instruction each time, the reset module 203 controls the reset end of the comparison module 202 to reset the comparison module 202, so that the comparison module 202 continues to perform the next comparison.
Optionally, the reset module 203 may be associated with the transmission timeslot to implement protection according to the transmission timeslot, that is, the negative feedback channel of the transmitting apparatus adjusts the attenuation value of the feedback path only within the transmission time period.
The adjustable attenuation module 204 is disposed in the negative feedback path of the transmitting device.
Optionally, the negative feedback path may refer to fig. 3, and specifically includes the adjustable attenuation module 204 and the digital controlled attenuator 303 in fig. 3; at this time, the input end of the adjustable attenuation module 204 is used as the input end of the negative feedback channel; the output end of the adjustable attenuation module 204 is connected with the input end of the numerical control attenuator 303 on the negative feedback channel.
Optionally, the adjustable attenuation module 204 is an adjustable attenuator. Specifically, the feedback gain may be implemented by a PIN diode, but is not limited thereto, and devices that can implement adjusting the feedback gain are within the scope of the present application.
The specific working principle of the protection circuit of the transmitting device is as follows:
when the transmitting device receives a signal to be transmitted and converts the signal into a current signal flowing through the PA 205, the current signal is detected by the current detection module 201 connected to the detection terminal of the PA 205 and then transmitted to an input terminal of the comparison module 202. The comparison module 202 compares the received transmit current signal with the reference current signal Iref sent by the DAC 206; when there is a harmful antenna mismatch condition, i.e., the transmission current signal is greater than the reference current signal, the comparing module 202 outputs an adjustment command to the adjustable attenuation module 204.
After receiving the adjustment instruction (such as a high level) indicating that the transmission current signal exceeds the reference current signal, which is output by the comparison module 202, the adjustable attenuation module 204 adjusts the feedback gain of the negative feedback channel of the transmitting apparatus, rapidly reduces the attenuation of the negative feedback channel, and feeds the attenuation back to the negative feedback end of the signal transmission branch (see 301 of fig. 3) in the transmitting apparatus, so as to reduce the transmission power and the current, and achieve rapid compensation in the antenna mismatch state in the transmitting apparatus, so that the transmitting apparatus is always in the normal transmission current state, and the normal operation of the transmitting apparatus is ensured.
As can be seen from the above principle, the protection circuit for a transmitting device provided in this embodiment detects a transmit current signal of a power amplifier PA 205 in the transmitting device through a current detection module 201, and compares the transmit current signal with a reference current signal to determine whether there is a harmful antenna mismatch condition; when the emission current signal exceeds the reference current signal, the comparison module 202 outputs an adjustment instruction to adjust the feedback gain of the negative feedback channel of the emission device, so that the emission current signal of the emission device is reduced, and the normal work of the emission device is guaranteed. Meanwhile, the process is simple and convenient, a switching matching circuit is not required to be arranged, excessive PCB space is avoided, and miniaturization of a terminal product is facilitated; moreover, processor software is not required to be arranged for switching control, and equipment required by the process is simple and easy to obtain, and high in feasibility.
The utility model also provides a transmitting circuit, see figure 3 on the basis of figure 2, include: a signal transmission branch 301, a PA 205, an output matching module 302, a digitally controlled attenuator 303, a processor 304, a DAC 206, and a transmitting device protection circuit 305 as described in any of the above; wherein:
the input of the signal transmission branch 301 receives an input signal to be transmitted, and its output is connected to the input of the PA 205.
The output end of the PA 205 is connected to the input end of the output matching module 302; one output terminal of the output matching module 302 serves as an output terminal of the transmitting circuit, and the other output terminal thereof is connected to an input terminal of the negative feedback path.
Optionally, the output matching module 302 includes: a load matching circuit and a directional coupler; the input end of the load matching circuit is used as the input end of the output matching module; the output end of the load matching circuit is connected with the input end of the directional coupler; the through end of the directional coupler is used as the output end of the transmitting circuit; the coupling end of the directional coupler is connected with the input end of the negative feedback channel; the directional coupler can couple a little bit of low-power signal from a transmitting path to a negative feedback channel. Of course, the specific configuration of the output matching module 302 is not limited thereto, and in practical application, it may depend on the specific application environment.
The negative feedback terminal of the signal transmission branch 301 is connected to the output terminal of the negative feedback channel. When the transmitting current signal exceeds the reference current signal, the adjustable attenuation module 204 adjusts the feedback gain of the negative feedback channel of the transmitting apparatus, and feeds back the feedback gain to the signal transmission branch 301 through the negative feedback end, so as to reduce the transmitting current and prevent the transmitting apparatus from generating a harmful antenna mismatch phenomenon.
The numerical control attenuator 303 is arranged in the negative feedback channel, the control end of the numerical control attenuator 303 is connected with the first output end of the processor 304, and the gain of the numerical control attenuator 303 is adjusted through the processor 304, so that the feedback gain of the negative feedback channel of the transmitting device is adjusted, and the manual adjustment of the feedback gain of the negative feedback channel is realized.
The second output terminal of the processor 304 is connected to the input terminal of the DAC 206, and transmits the analog signal to be converted, i.e., the reference current data, to the DAC 206, so that the output terminal of the DAC 206 can output the reference current signal Iref.
The specific structure and operation principle of the transmitting device protection circuit 305 can be obtained by referring to the above embodiments, and are not described in detail herein.
The utility model also provides a terminal, see figure 4, include: a housing 401, a transmitting antenna 402, a battery, and a transmitting circuit 403 as described in any of the above embodiments; wherein:
the transmitting circuit 403 is disposed inside the housing 401.
The transmitting antenna 402 is disposed outside the housing 401, and a signal receiving end of the transmitting antenna 402 is connected to an output end of the transmitting circuit 403 to transmit a signal to be transmitted.
The battery is disposed in the battery slot 404 of the housing 401 and connected to the power supply terminal of the transmitter circuit 403.
The terminal of the above-described structure can implement a signal transmission function such as a transmitter. Based on the above structure, referring to fig. 5, the terminal may further include: a receiving antenna 402 (which has both transmitting and receiving functions), a receiving circuit 405 and a playing device 406, so that the terminal can have both signal receiving functions, such as a handheld interphone; wherein:
an input terminal of the receiving circuit 405 is connected to a signal output terminal of the receiving antenna 402, and an output terminal of the receiving circuit 405 is connected to an input terminal of the external-discharge device 406.
It should be noted that the play-out device 406 may be an audio power amplifier device such as a play-out speaker and a play-out sound, and is not limited herein, and devices capable of playing audio are all within the scope of the present application.
The present application provides a specific embodiment of a transmitting circuit, and on the basis of fig. 3, referring to fig. 6, the transmitting device to which the transmitting circuit belongs is a radio frequency signal transmitter with linearized analog predistortion, and an analog attenuator 501 with switchable two-step attenuation values is added on a feedback path of the transmitting device. The specific implementation process is as follows:
after the terminal enters a working state, a radio frequency signal transmitter receives an input signal to be transmitted and converts the input signal into a transmission current, and a current detection module 201 acquires a transmission current signal flowing through a PA 205 channel and transmits the transmission current signal to a comparison module 202; then the comparison module 202 compares the received emission current signal with the received reference current signal Iref, and when the emission current signal is greater than the reference current signal Iref, the comparison module 202 sends out an adjustment instruction signal, i.e. outputs a high level; therefore, when the antenna is mismatched, if the transmission current signal is increased, the comparison module 202 outputs a high level to the adjustable attenuator 204, and then the adjustable attenuator 204 adjusts the feedback gain to rapidly reduce the attenuation of the feedback path of the transmitting device, so that the transmission power and the transmission current are rapidly reduced, thereby ensuring the normal operation of the device and rapidly solving the problem of abnormal operation of the device caused by the mismatch of the transmitter antenna. In the experimental process, the transmitting power of the radio frequency signal transmitter is reduced within 5us, 200us can be realized stably, and the effect of reducing the transmitting power is obvious.
Based on the above embodiments, the present application provides the following specific simulation processes:
during testing, the output end of the terminal antenna is connected with the phase shifter with one open end to simulate mismatched load, and the transmitting current is changed when the phase of the phase shifter is changed, so that different antenna reflection coefficients are simulated. Test data obtained during the simulation, see fig. 7. The curve in the figure is the transmission current of the mobile equipment, and the curve in the figure is the command signal which is output by the comparison module and used for adjusting the attenuation value of the feedback path, and the command signal has two levels, namely a high level and a low level, and corresponds to two-gear attenuation values.
The current threshold preset by the simulation scheme is 2.42A. Without any measures taken (see upper left diagram of fig. 7), the emission current reached 2.64A; if the scheme of the application is adopted, when the current reaches the preset value of 2.42A, a protective measure is immediately generated, the data change (see the left lower graph of FIG. 7) in the implementation process can see the emission current, namely, the curve of the figure is started to descend within 3us after the command signal is sent out; the upper right graph of fig. 7 shows the current reduction process, and it can be seen that the emission current is gradually stabilized after about 200us, the current is reduced by 600mA, and the low-current harmless emission state continues until the emission is finished; after the transmission is finished, referring to the lower right diagram of fig. 7, the reset module resets the output state of the comparison module to the normal working state, and the corresponding attenuation value returns to the normal state value to prepare for the next protection of the transmitter. Before the next transmission comes, the comparison module is reset, so that the next protection work can be continued; if the emission current still exceeds 2.42A in the next protection process, the protection work of reducing the current is continued; if the emission current does not exceed 2.42A, normal emission is completed.
The prior art also discloses schemes for selecting different matching networks to match devices to antennas according to the configurable shell of the handheld machine. However, the processor adopted in the circuit participates in calculation, so that not only is the time delay of protection response increased, but also the development cost and complexity of the system are increased, and even the power consumption of the system is increased. The current detection module is arranged to detect the emission current signal, the comparison module is arranged to compare the emission current signal with the reference current signal, and when the antenna mismatch state exists, the comparison module sends an adjustment instruction to the adjustable attenuation module to adjust the gain of the negative feedback channel of the emission device, namely, whether the antenna mismatch condition seriously influencing the work of the equipment exists is judged according to the change of the emission current, and the normal work of the equipment is ensured by adjusting the attenuation value of the negative feedback channel of the emission device. The scheme does not need to set a processor for calculation, and is high in feasibility and low in system power consumption.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A transmission device protection circuit, comprising: the device comprises a current detection module, a comparison module, a reset module and an adjustable attenuation module; wherein:
the input end of the current detection module is connected with the emission current detection position of a Power Amplifier (PA) in the emission device, and the output end of the current detection module is connected with one input end of the comparison module;
the other input end of the comparison module is connected with the output end of a digital-to-analog converter (DAC) in the transmitting device and receives a reference current signal; the output end of the comparison module is connected with the control end of the adjustable attenuation module and outputs an adjustment instruction;
the output end of the reset module is connected with the reset end of the comparison module;
the adjustable attenuation module is arranged in a negative feedback channel of the transmitting device.
2. The protection circuit of claim 1, wherein an input terminal of the adjustable attenuation module is an input terminal of the negative feedback channel;
and the output end of the adjustable attenuation module is connected with the input end of the numerical control attenuator on the negative feedback channel.
3. The transmitting device protection circuit of claim 1, wherein the current detection module is: the current collecting resistor is connected in series with a power supply line of the PA; or a current collecting chip.
4. The protection circuit of claim 1, wherein the comparison module is an operational amplifier or a comparator.
5. The transmission-device protection circuit of claim 1, wherein the adjustable attenuation module is an adjustable attenuator.
6. A transmit circuit, comprising: a signal transmission branch, a PA, an output matching module, a numerical control attenuator, a processor, a DAC and the transmitting device protection circuit of any one of claims 1-5; wherein:
the input end of the signal transmission branch receives an input signal to be transmitted;
the negative feedback end of the signal transmission branch circuit is connected with the output end of the negative feedback channel; the numerical control attenuator is arranged in the negative feedback channel;
the output end of the signal transmission branch circuit is connected with the input end of the PA;
the output end of the PA is connected with the input end of the output matching module;
one output end of the output matching module is used as the output end of the transmitting circuit;
the other output end of the output matching module is connected with the input end of the negative feedback channel;
the output end of the processor is respectively connected with the control end of the numerical control attenuator and the input end of the DAC;
and the output end of the DAC outputs a reference current signal.
7. The transmit circuit of claim 6, wherein the output matching module comprises: a load matching circuit and a directional coupler;
the input end of the load matching circuit is used as the input end of the output matching module;
the output end of the load matching circuit is connected with the input end of the directional coupler;
the through end of the directional coupler is used as the output end of the transmitting circuit;
and the coupling end of the directional coupler is connected with the input end of the negative feedback channel.
8. The transmit circuit of claim 6, wherein the first output of the processor is coupled to the control terminal of the digitally controlled attenuator;
a second output of the processor outputs reference current data to an input of the DAC.
9. A terminal, comprising: a housing, a transmit antenna, a battery, and the transmit circuit of any of claims 6-8; wherein:
the transmitting circuit is arranged inside the shell;
the transmitting antenna is arranged outside the shell, and a signal receiving end of the transmitting antenna is connected with an output end of the transmitting circuit;
the battery is arranged in the battery groove of the shell and is connected with the power supply end of the transmitting circuit.
10. The terminal of claim 9, further comprising: the device comprises a receiving antenna, a receiving circuit and an external device; wherein:
the input end of the receiving circuit is connected with the signal output end of the receiving antenna;
and the output end of the receiving circuit is connected with the input end of the external amplifying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021566106.5U CN213072623U (en) | 2020-07-31 | 2020-07-31 | Protection circuit of transmitting device, transmitting circuit and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021566106.5U CN213072623U (en) | 2020-07-31 | 2020-07-31 | Protection circuit of transmitting device, transmitting circuit and terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118631190A (en) * | 2024-08-09 | 2024-09-10 | 北京唯得科技有限公司 | An adaptive radio frequency amplifier mismatch protection circuit and mismatch protection method |
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2020
- 2020-07-31 CN CN202021566106.5U patent/CN213072623U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118631190A (en) * | 2024-08-09 | 2024-09-10 | 北京唯得科技有限公司 | An adaptive radio frequency amplifier mismatch protection circuit and mismatch protection method |
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