CN109066625B - Electrostatic protection circuit - Google Patents
Electrostatic protection circuit Download PDFInfo
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- CN109066625B CN109066625B CN201810967472.2A CN201810967472A CN109066625B CN 109066625 B CN109066625 B CN 109066625B CN 201810967472 A CN201810967472 A CN 201810967472A CN 109066625 B CN109066625 B CN 109066625B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
Abstract
An exemplary embodiment of the present application discloses an electrostatic protection circuit, which at least comprises: radio frequency device, voltage stabilizing circuit and matching circuit, wherein: the matching circuit is connected with the radio frequency device; the voltage stabilizing circuit at least comprises a transient suppression diode TVS tube which is used for at least limiting the current value flowing through two ends of the voltage stabilizing circuit within a preset current range; the matching circuit is connected with the voltage stabilizing circuit through a wire and used for attenuating the electrostatic energy corresponding to the current value generated in the voltage stabilizing circuit.
Description
Technical Field
The present application relates to the field of electrostatic protection technology, and relates to, but is not limited to, an electrostatic protection circuit.
Background
At present, almost all smart phones, tablet computers and notebook computers support wireless fidelity (WiFi) internet access, and the wireless fidelity (WiFi) internet access technology is the most widely used wireless network transmission technology at present. The WiFi function in the mobile phone can be used for accessing the internet without a mobile communication network when WiFi wireless signals exist, so that the traffic fee is saved. However, in the related art, the protection measure for the large current to damage the Power Amplifier (PA) in the WiFi is not enough, and the low internal resistance state of the WiFi path is easily broken down by static electricity. In the related art, only a Transient Voltage Suppressor (TVS) is used to limit Voltage or match current energy of a device, so that only electrostatic energy can be reduced as a whole, and peak current suppression within a certain time is still weak.
Disclosure of Invention
Accordingly, an exemplary embodiment of the present invention is directed to an electrostatic discharge protection circuit that solves at least one of the problems of the related art.
The technical scheme of an exemplary embodiment of the present application is realized as follows:
an exemplary embodiment of the present application provides an electrostatic protection circuit, including:
the voltage stabilizing circuit is connected with the radio frequency device;
the voltage stabilizing circuit at least comprises a transient suppression diode TVS tube which is used for at least limiting the current value flowing through two ends of the voltage stabilizing circuit within a preset current range;
the matching circuit is connected with the voltage stabilizing circuit through a wire and used for attenuating the electrostatic energy corresponding to the current value generated in the voltage stabilizing circuit.
In the circuit, in the electrostatic protection circuit, a current flows from the voltage stabilizing circuit to the radio frequency device.
In the circuit, the TVS tube is configured to limit a voltage value at two ends of the TVS tube and a current value flowing through two ends of the TVS tube within a preset voltage range and a preset current range, respectively.
In the above circuit, the voltage stabilizing circuit further includes: the circuit comprises a voltage stabilizing diode, a triode, a rectifier diode and an inductor; wherein:
the anode of the rectifier diode is connected with the triode, and the cathode of the rectifier diode is connected with the first end of the inductor;
the second end of the inductor is connected with the triode;
the positive pole of the voltage stabilizing diode is connected with the triode, and the negative pole of the voltage stabilizing diode is connected with the first end of the inductor.
In the above circuit, the transistor includes a first transistor and a second transistor, wherein;
a collector of the first triode is connected with the second end of the inductor, an emitter of the first triode is connected with the anode of the rectifier diode, and a base of the first triode is connected with the cathode of the voltage stabilizing diode;
the base electrode of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with the base electrode of the first triode, and the emitting electrode of the second triode is connected with the first end of the inductor.
In the above circuit, the first triode is a PNP type triode and the second triode is an NPN type triode.
In the above circuit, the matching circuit includes at least: filter inductance and filter capacitance, wherein:
the positive electrode of the filter inductor is connected with the antenna port, and the negative electrode of the filter inductor is grounded;
the filter capacitor is connected with the filter inductor, and a connecting port of the filter capacitor and the filter inductor is connected with a protected device.
In the above circuit, the filter inductor includes a first inductor and a second inductor, and the filter capacitor includes a patch capacitor, where:
the positive electrode of the first inductor is connected with the antenna port;
one end of the chip capacitor is connected with the anode of the first inductor, and the other end of the chip capacitor is connected with the anode of the second inductor;
the interface of the second inductor and the interface of the patch capacitor are connected with the protected device;
the negative electrode of the first inductor and the negative electrode of the second inductor are both grounded.
In the circuit, the first inductor in the matching circuit is connected with the voltage stabilizing diode in the voltage stabilizing circuit, or the second inductor in the matching circuit is connected with the voltage stabilizing diode in the voltage stabilizing circuit.
In the circuit, the electrostatic protection circuit further comprises a band-pass filter, and the band-pass filter is connected with a voltage stabilizing diode in the voltage stabilizing circuit;
and the band-pass filter is used for limiting the frequency of static electricity corresponding to the current generated in the voltage stabilizing circuit within a preset frequency band.
An exemplary embodiment of the present application provides an electrostatic protection circuit, wherein the circuit includes at least: the radio frequency device, the voltage stabilizing circuit and the matching circuit; wherein: the voltage stabilizing circuit is connected with the radio frequency device; the voltage stabilizing circuit at least comprises a transient suppression diode TVS tube which is used for at least limiting the current value flowing through two ends of the voltage stabilizing circuit within a preset current range; the matching circuit is connected with the voltage stabilizing circuit through a wire and is used for attenuating electrostatic energy corresponding to a current value generated in the voltage stabilizing circuit; therefore, by adopting the TVS tube, after the current in the preset time is restrained, the electrostatic energy is further attenuated by the attenuation mode of the matching circuit, so that the damage of the electrostatic to the radio frequency device in the circuit is effectively reduced.
Drawings
FIG. 1 is a waveform diagram of an electrostatic current in the related art;
FIG. 2 is a schematic diagram illustrating an exemplary embodiment of an ESD protection circuit according to the present application;
FIG. 3A is a schematic diagram of another exemplary embodiment of an electrostatic discharge protection circuit;
FIG. 3B is a schematic diagram illustrating a current variation curve in an ESD protection circuit according to an exemplary embodiment of the present application;
fig. 4A is a schematic diagram of a conventional circuit structure for circuit protection using a conventional TVS transistor in the related art;
FIG. 4B is a schematic diagram illustrating a current variation curve in an ESD protection circuit according to the related art;
FIG. 5 is a schematic diagram of another exemplary embodiment of an ESD protection circuit according to the present application;
FIG. 6 is a diagram illustrating the results of an exemplary embodiment of the present application employing an ESD protection circuit.
Detailed Description
The technical solution in an exemplary embodiment of the present application will be clearly and completely described below with reference to the accompanying drawings in an exemplary embodiment of the present application.
An exemplary embodiment of the present application provides an electrostatic discharge protection circuit, and fig. 1 is a waveform diagram of an electrostatic current in the related art, as shown in fig. 1, where an abscissa of the waveform diagram represents time in nanoseconds (ns) and an ordinate of the waveform diagram represents a current. Waveform 11 represents an electrostatic current waveform under the International Electrotechnical Commission (IEC) IEC61000-4-2 standard. As can be seen from FIG. 1, during time interval 12 (time t)pBetween 0.7ns and 1 ns), a current peak value of an instantaneous large current of the electrostatic current appears on the waveform 11, and the instantaneous large current will inevitably damage the radio frequency device in the WiFi.
In order to protect a radio frequency device in WiFi from being damaged by a large current at an instant of static electricity, an exemplary embodiment of the present application provides an electrostatic protection circuit, fig. 2 is a schematic diagram of a composition structure of the electrostatic protection circuit according to an exemplary embodiment of the present application, and as shown in fig. 2, the circuit 20 includes: radio frequency device 23, voltage regulator circuit 21 and matching circuit 22, wherein:
the matching circuit 22 is connected with the radio frequency device 23;
the voltage stabilizing circuit 21 at least comprises a transient suppression diode TVS tube, and is used for at least limiting the value of current flowing through two ends of the voltage stabilizing circuit within a preset current range;
here, the TVS tube is a novel TVS tube, and can control a current flowing through the TVS tube within a predetermined current range.
The matching circuit 22 is connected with the voltage stabilizing circuit 21 through a wire, and the matching circuit 22 is used for attenuating electrostatic energy corresponding to a current value generated in the voltage stabilizing circuit.
In the present embodiment, t is first set by the voltage stabilizing circuit 21pThe current between 0.7ns and 1ns is suppressed, and then the matching circuit 22 is adopted to attenuate the electrostatic energy corresponding to the suppressed current, so that the electrostatic current flowing to the radio frequency device in the WiFi circuit is not too large, and the radio frequency device in the WiFi circuit is protected from being broken down.
In an exemplary embodiment of the present application, in the electrostatic protection circuit 20, a current flows from the voltage regulator circuit 21 to the radio frequency device 23, that is, the current flows through the voltage regulator circuit 21 first, and then after being suppressed by the voltage regulator circuit, the suppressed current flows to the radio frequency device 23; therefore, the current flowing to the radio frequency device is not too large, and the radio frequency device is not broken down.
In an exemplary embodiment of the present application, the TVS tube is configured to limit a voltage value across the TVS tube and a current value flowing through the TVS tube within a preset voltage range and a preset current range, respectively.
An exemplary embodiment of the present application provides an electrostatic protection circuit, and fig. 3A is a schematic diagram of another component structure of the electrostatic protection circuit according to an exemplary embodiment of the present application, as shown in fig. 3A, the electrostatic protection circuit 30 includes a voltage stabilizing circuit 31 and a matching circuit 32; wherein, the voltage stabilizing circuit 31 includes: a zener diode 301, a first triode 302, a second triode 303, a rectifier diode 304, and an inductor 305; wherein:
the collector of the first transistor 302 is connected to the second end of the inductor 305, the transmitter of the first transistor 302 is connected to the anode of the rectifying diode 304, and the base of the first transistor 302 is connected to the cathode of the zener diode 301;
the base of the second triode 303 is connected with the collector of the first triode 302, the collector of the second triode 303 is connected with the base of the first triode 302, and the emitter of the second triode 303 is connected with the first end of the inductor 305.
The cathode of the rectifier diode 301 is connected to the first end of the inductor 305;
a second terminal of the inductor 305 is connected to the base of the second triode 303.
Here, the first transistor 302 is a PNP transistor, and the second transistor 303 is an NPN transistor.
The access port of the voltage stabilizing circuit 31 is connected with the antenna port 33, and then the electrostatic current flowing from the antenna port 33 is restrained within a certain range, so that the current flowing into the rear circuit does not have instantaneous large current, and the radio frequency device in the WiFi circuit is broken down. After the constant voltage circuit 31 suppresses the current flowing into the antenna port, the abscissa represents the voltage, the ordinate represents the current, and the curve 35 represents the change of the current and the voltage, as shown in fig. 3B. VBRIndicating an open emitter, a reverse breakdown voltage of the collector junction, ITRepresenting the current corresponding to the voltage; vCLRepresenting the voltage across the inductance; vRWMThe reverse working peak voltage is shown, and the reverse peak voltage when the voltage stabilizing diode is not broken down is ensured, IRRepresenting the current corresponding to the voltage; rDYNA resistance value representing a variation with current and voltage; i isPPRepresenting the peak-valley difference current value in the circuit; vHOLDIndicating clamping electricityPressing; i isHOLDRepresents the clamp current; as can be seen from fig. 3B, after the voltage stabilizing circuit 31 of the present embodiment is disposed at the antenna port, the current does not continuously increase, and when the voltage is VBRIn time, the current is suppressed by the TVS tube in the voltage stabilizing circuit 31, so that the current returns to IHOLD. In FIG. 3B, the maximum clamping voltage VCCan be expressed as: vC＝VHOLD+IPP+RDYN。
Therefore, the circuit flowing into the circuit behind the voltage stabilizing circuit 31 is ensured not to be overlarge, and components of the circuit behind are protected from being broken down.
An output port of the voltage stabilizing circuit 31 is connected to an input port of the matching circuit 32, wherein the matching circuit 32 includes:
a first inductor 321 and a second inductor 322, the filter capacitor comprising a patch capacitor 323 wherein:
the positive electrode of the first inductor 321 is connected to the antenna port 33;
one end of the chip capacitor 323 is connected to the positive electrode of the first inductor 321, and the other end of the chip capacitor 323 is connected to the positive electrode of the second inductor 322;
the interface of the second inductor 322 and the patch capacitor 323 is connected with the protected device 34;
the negative pole of the first inductor 321 and the negative pole of the second inductor 322 are both grounded.
Here, the protected device 34 may be understood as any device to be electrostatically protected, such as a radio frequency device of a WiFi circuit, a CMOS transistor, and the like.
In this embodiment, the antenna port is connected to the voltage stabilizing circuit, and the interface between the rearmost second inductor in the matching circuit and the patch capacitor is connected to the protected device, so that the electrostatic current flowing out from the antenna port is effectively suppressed, and then the suppressed current is input to the matching circuit, so that the electrostatic energy corresponding to the suppressed current is attenuated, and therefore the electrostatic current flowing into the protected device is within the control range, and the electrostatic energy in the protected device is small, thereby effectively avoiding the damage of the electrostatic current to the protected device.
An exemplary embodiment of the present application provides an electrostatic protection circuit, fig. 4A is a schematic diagram of a conventional circuit composition structure for performing circuit protection by using a conventional TVS tube in the related art, as shown in fig. 4A, in the related embodiment, the conventional circuit 40 (i.e., the conventional TVS tube) includes a first diode 401, a second diode 402, and a voltage regulator 403, wherein an anode of the second diode 402 is connected to an anode of the voltage regulator diode 403, an anode of the first diode 401 is connected to a cathode of the second diode 402, and a cathode of the first diode 401 is connected to a cathode of the voltage regulator diode 403; when the conventional TVS transistor circuit 40 is used to perform electrostatic protection on a circuit, the variation of the electrostatic current in the circuit is shown in fig. 4B, and a curve 42 represents the variation of the current and the voltage. As can be seen from fig. 4B, the conventional TVS tube is used to clamp the voltage in the circuit, and there is no limitation on the current in the circuit, so that even if the circuit is placed in a WiFi circuit, it is still unavoidable that the rf device in the WiFi circuit is broken down by a large current.
In order to better protect the influence of the electrostatic current on the rf device in the WiFi circuit, an exemplary embodiment of the present application provides an electrostatic protection circuit, fig. 5 is another schematic structural diagram of the electrostatic protection circuit according to an exemplary embodiment of the present application, as shown in fig. 5, the electrostatic protection circuit 50 includes a first zener diode 501, a second zener diode 502, a first inductor 503, a second inductor 504, and a patch capacitor 505, where the first zener diode 501 is connected to the second zener diode 502, and a connection port of the first zener diode 501 and the second zener diode 502 is connected to a first end of the first inductor 503; the second end of the first inductor 503 is connected to one end of the patch capacitor 505, and the other end of the patch capacitor 505 is connected to the first end of the second inductor; the connection ports of the first zener diode 501 and the second zener diode 502 are connected to the antenna port 506 in the WiFi circuit, so that the electrostatic current flowing from the antenna port is suppressed within a range of not more than the clamp current. Then, the suppressed current flows into a circuit formed by the first inductor 503, the second inductor 504 and the capacitor 504, so that electrostatic energy corresponding to the current is effectively attenuated, and the device 506 to be protected connected to the connection port of the second inductor 504 and the capacitor 504 is protected from being broken down by the electrostatic current.
In other embodiments, the electrostatic protection circuit may further include a voltage stabilizing circuit and a band pass filter, which may be understood as replacing the matching circuit with the band pass filter, thereby simplifying the design process of the circuit.
Fig. 6 is a schematic diagram of the result of using the electrostatic discharge protection circuit according to an exemplary embodiment of the present application, and as shown in fig. 6, S (1,1) and S (1,2) both represent standing wave ratios in a radio frequency communication system, which is a 50 ohm transmission system in this embodiment. The frequency corresponding to point m2 in curve 61 is 500 Megahertz (MHZ), i.e. the frequency corresponding to the frequency of the electrostatic current. The point m3 corresponds to a frequency of 5.8 Gigahertz (GHZ), that is, the frequency corresponds to a frequency when the WiFi circuit operates, in order to protect the radio frequency device in the WiFi circuit in this embodiment, so the smaller the loss for the useful frequency, the better the performance of the system, as can be seen from the curve 61 in fig. 6, the standing wave ratio corresponding to m2 is dB (S (1,1)) -0.062, and the standing wave ratio corresponding to the point m3 with a frequency of 5.8GHZ is dB (S (1,1)) -14.681, which is smaller than the threshold value-10 specified in the radio frequency system, which illustrates that the loss generated when the electrostatic protection circuit provided by this embodiment is used to protect the radio frequency device in the WiFi circuit is reasonable.
In the curve 62, the point m4 corresponds to a frequency of 500MHZ, i.e. a frequency corresponding to the frequency of the electrostatic current. The point M1 corresponds to a frequency of 5.8GHZ, that is, the frequency corresponds to the operation of the WiFi circuit, in order to protect the rf device in the WiFi circuit from electrostatic breakdown in this embodiment, the more the current loss at 500M frequency, the better the system performance, as can be seen from fig. 6, the standing wave ratio dB (S (1,2)) -49.867 corresponding to M4 is closer to 50, which indicates that the closer the frequency to the 50 ohm rf communication system is, the better the system performance is; moreover, the smaller the loss of the useful frequency, the better the performance of the system, and as can be seen from the curve 62 in fig. 6, the standing-wave ratio corresponding to the point m1 corresponding to the operating frequency 5.8GHZ of the WiFi circuit is dB (S (1,2)) — 0.382, which is very close to 0, which shows that, in the WiFi circuit using the electrostatic protection circuit provided in this embodiment, the loss of the useful signal is very small, which is close to 0, which shows that the electrostatic protection circuit provided in this embodiment not only effectively prevents the radio frequency device in the WiFi circuit from being broken down, but also effectively ensures the useful frequency in the WiFi circuit.
Here, it should be noted that: for technical details not disclosed in the embodiments of the circuit of the present application, refer to the description of the embodiments of the circuit of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic thereof, and should not constitute any limitation to the implementation process of an exemplary embodiment of the present application. The above-mentioned serial numbers of an exemplary embodiment of the present application are for description only and do not represent the merits of the embodiment.
It should be noted that, in this document, 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 like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of an exemplary embodiment of the present application.
In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated units described above in the present application may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as independent products. Based on such understanding, the technical solutions of the exemplary embodiments of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a terminal to execute all or part of the circuits described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. An electrostatic discharge protection circuit, comprising: the radio frequency device, the voltage stabilizing circuit and the matching circuit; wherein:
the matching circuit is connected with the radio frequency device;
the voltage stabilizing circuit comprises a voltage stabilizing diode, a triode, a rectifier diode and an inductor and is used for at least limiting the current value flowing through two ends of the voltage stabilizing circuit within a preset current range; wherein: the negative electrode of the rectifier diode is connected with the triode, and the positive electrode of the rectifier diode is connected with the first end of the inductor; the second end of the inductor is connected with the triode; the negative electrode of the voltage stabilizing diode is connected with the triode, and the positive electrode of the voltage stabilizing diode is connected with the first end of the inductor;
the matching circuit is connected with the voltage stabilizing circuit through a wire and is used for attenuating electrostatic energy corresponding to a current value generated in the voltage stabilizing circuit;
in the electrostatic protection circuit, current flows from the voltage stabilizing circuit to the matching circuit and then flows from the matching circuit to the radio frequency device.
2. The ESD protection circuit of claim 1, wherein the transistor comprises a first transistor and a second transistor, wherein;
a collector of the first triode is connected with the second end of the inductor, an emitter of the first triode is connected with the negative electrode of the rectifier diode, and a base of the first triode is connected with the negative electrode of the voltage stabilizing diode;
the base electrode of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with the base electrode of the first triode, and the emitting electrode of the second triode is connected with the first end of the inductor.
3. The ESD protection circuit of claim 2 wherein the first transistor is a PNP transistor and the second transistor is an NPN transistor.
4. The electrostatic protection circuit of claim 1, wherein the matching circuit comprises at least: filter inductance and filter capacitance, wherein:
the filter inductor comprises a first inductor and a second inductor, and the filter capacitor comprises a patch capacitor;
the positive electrode of the first inductor is connected with the antenna port;
one end of the chip capacitor is connected with the anode of the first inductor, and the other end of the chip capacitor is connected with the anode of the second inductor;
the interfaces of the second inductor and the patch capacitor are connected with the radio frequency device;
the negative electrode of the first inductor and the negative electrode of the second inductor are both grounded.
5. The ESD protection circuit of claim 1 further comprising a band pass filter, wherein the positive pole of the band pass filter is connected to the antenna port, and the negative pole of the band pass filter is connected to the RF device;
and the band-pass filter is used for limiting the frequency of static electricity corresponding to the current generated in the voltage stabilizing circuit within a preset frequency band.
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| CN201810967472.2A CN109066625B (en) | 2018-08-23 | 2018-08-23 | Electrostatic protection circuit |
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| CN201810967472.2A CN109066625B (en) | 2018-08-23 | 2018-08-23 | Electrostatic protection circuit |
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| CN109066625A CN109066625A (en) | 2018-12-21 |
| CN109066625B true CN109066625B (en) | 2020-09-15 |
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| CN117650494A (en) * | 2024-01-29 | 2024-03-05 | 深圳市蔚来芯科技有限公司 | Electrostatic protection circuit and electrostatic protection method for display screen chip |
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| US7466527B1 (en) * | 2007-07-30 | 2008-12-16 | Ite Tech. Inc. | Electrostatic discharge protection circuit |
| CN202111761U (en) * | 2011-07-19 | 2012-01-11 | 广东欧珀移动通信有限公司 | ESD protection circuit of handset antenna |
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| US7466527B1 (en) * | 2007-07-30 | 2008-12-16 | Ite Tech. Inc. | Electrostatic discharge protection circuit |
| CN202111761U (en) * | 2011-07-19 | 2012-01-11 | 广东欧珀移动通信有限公司 | ESD protection circuit of handset antenna |
| CN203225744U (en) * | 2013-05-10 | 2013-10-02 | 成都千嘉科技有限公司 | Wireless transceiving equipment for energy measurement of Internet of Things |
| CN207200685U (en) * | 2017-09-07 | 2018-04-06 | 厦门美图移动科技有限公司 | A kind of rf signal reception circuit |
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