CN104052442A - Voltage controller for radio-frequency switch - Google Patents
Voltage controller for radio-frequency switch Download PDFInfo
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- CN104052442A CN104052442A CN201310595454.3A CN201310595454A CN104052442A CN 104052442 A CN104052442 A CN 104052442A CN 201310595454 A CN201310595454 A CN 201310595454A CN 104052442 A CN104052442 A CN 104052442A
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Abstract
One or more systems and techniques for limiting a voltage potential between an antenna and a radio-frequency switch circuit are provided. A voltage controller comprises a voltage generator, a voltage detection circuit and a switch cell. The voltage detection circuit is coupled to the voltage generator and to the switch cell, and the switch cell is coupled to a voltage source, and to a node between the radio-frequency switch circuit and the antenna. When the voltage potential exceeds a specified threshold, the voltage generator produces a voltage which the voltage detection circuit measures such that the voltage detection circuit activates the switch cell, resulting in a short circuit between the radio-frequency switch circuit and the voltage source. This serves to inhibit the voltage potential from exceeding the specified threshold, for example. The invention also provides an application method of a power controller in a radio-frequency switch circuit.
Description
The cross reference of related application
The application is the continuation application of No. 61/799th, 390, the title submitted on March 15th, 2013 U.S. Provisional Patent Application that is " VOLTAGE CONTROLLER FOR RADIO-FREQUENCY SWITCH ", and its full content is hereby expressly incorporated by reference.
Technical field
The present invention relates in general to radio-frequency (RF) switch, more specifically, relates to the voltage controller for radio-frequency (RF) switch.
Background technology
Radio-frequency (RF) switch is applied in Wireless Telecom Equipment or other devices conventionally.The different circuit that this switch is configured to be easy to Wireless Telecom Equipment are connected to antenna.For example, sometimes, when by antenna reception information, expectation is connected to antenna by set of circuits, and when transmission information, expectation is connected to antenna by second group of circuit.As another example, sometimes, when communicating by letter according to first communication party case, expectation is connected to antenna by set of circuits, and when communicating by letter according to second communication scheme, expectation is connected to antenna by second group of circuit.
Summary of the invention
Content of the present invention is provided, thus the concept of selecting with the form introduction of simplifying, and it will further describe in the following detailed description.Content of the present invention is neither intended to claimed theme to carry out popularity and summarize, determine key factor or the essential characteristic of claimed theme, is not also intended to for limiting the scope of claimed theme.
According to some embodiment, provide a kind of voltage controller for electromotive force between control antenna and radio-frequency switch circuit.Voltage controller is configured to for monitoring electromotive force.When voltage controller determines that electromotive force surpasses defined threshold, voltage controller is configured to starting switch unit.The startup of switch element is configured to voltage source to be connected to radio-frequency switch circuit, thereby reduces electromotive force.In certain embodiments, voltage source ground connection.In such an embodiment, when electromotive force surpasses defined threshold, switch element makes described radio-frequency switch circuit ground connection to reduce the electromotive force between antenna and radio-frequency switch circuit.By this way, the voltage that is applied to radio-frequency switch circuit can not surpass the voltage maintaining that radio-frequency switch circuit be configured.
In certain embodiments, the increase of electromotive force causes by antenna open circuit, and wherein antenna becomes with antenna port physics and disconnects.In certain embodiments, voltage controller is configured to identify antenna open circuit based on electromotive force, and when antenna open circuit, starting switch unit.
According to an aspect of the present invention, provide a kind of voltage controller for radio-frequency switch circuit, having comprised: voltage detecting circuit, has been configured to determine the electromotive force between antenna and radio-frequency switch circuit; And switch element, be configured to, when electromotive force surpasses defined threshold, by electromotive force is applied to voltage source, reduce electromotive force.
Preferably, voltage source ground connection.
Preferably, this voltage controller comprises and being configured to based on electromotive force and the reference voltage generator of generating reference voltage.
Preferably, voltage detecting circuit is configured to determine electromotive force based on reference voltage.
Preferably, reference voltage generator comprises voltage divider.
Preferably, switch element comprises the first transistor.
Preferably, voltage detecting circuit is connected to the grid of the first transistor.
Preferably, the first transistor comprises N-shaped transistor.
Preferably, the first transistor comprises N-shaped mos field effect transistor (MOSFET).
Preferably, switch element comprises the first transistor of connecting with transistor seconds.
Preferably, radio-frequency switch circuit comprises the first switch element and second switch unit.
Preferably, voltage controller is configured to suppress electromotive force over defined threshold.
According to a further aspect in the invention, provide a kind of method, having comprised: determined the electromotive force between antenna and radio-frequency switch circuit; And in response to electromotive force surpasses defined threshold, radio-frequency switch circuit is connected to voltage source.
Preferably, connect and to comprise radio-frequency switch circuit is connected to ground.
Preferably, determine the reference voltage that comprises that measurement generates based on electromotive force.
Preferably, connect and comprise the starting switch unit in response to reference voltage surpasses the second defined threshold.
Preferably, connect and comprise the starting switch unit in response to electromotive force surpasses defined threshold.
According to another aspect of the invention, provide a kind of device for Wireless Telecom Equipment, having comprised: radio-frequency switch circuit, has been configured to transmit one or more signals between other circuit of antenna and Wireless Telecom Equipment; And voltage controller, be configured to determine that electromotive force between radio-frequency switch circuit and antenna is with identification antenna open circuit.
Preferably, voltage controller is configured to, in response to the antenna open circuit recognizing, electromotive force is applied to voltage source.
Preferably, voltage source comprises ground.
Below explanation and accompanying drawing have been set forth some exemplary aspect and execution mode.These are only that several modes to realizing in the different modes of one or more aspects are illustrated.When considered in conjunction with the accompanying drawings, according to following detailed description, other aspects of the present invention, advantage and novel feature will become apparent.
Accompanying drawing explanation
Fig. 1 shows and suppresses the flow chart that electromotive force surpasses the method for defined threshold.
Fig. 2 is according to the diagram of the circuit of some embodiment.
Fig. 3 is according to the diagram of the circuit of some embodiment.
Fig. 4 is according to the diagram of the circuit of some embodiment.
Embodiment
By using prescribed language, the embodiment shown in accompanying drawing or example are disclosed hereinafter.Yet, should be appreciated that embodiment or example are not for restriction.Those of ordinary skill in the art should easily expect any variation in embodiment disclosed by the invention and modification and any further application to disclosed principle in the application.
In certain embodiments, provide a kind of device for Wireless Telecom Equipment.This device comprises radio-frequency switch circuit, radio-frequency switch circuit be configured to antenna or be connected to the antenna port of antenna and other circuit of Wireless Telecom Equipment between transmit one or more signals.This device also comprises the voltage controller that is configured to monitor the electromotive force between radio-frequency switch circuit and antenna.
In certain embodiments, voltage controller is configured to based on electromotive force identification antenna open circuit.For example, if electromotive force surpasses defined threshold, voltage controller is configured to determine that antenna open circuit occurs and is configured to radio-frequency switch circuit to be connected to voltage source.In certain embodiments, voltage source ground connection.The method is configured to alleviate by antenna open circuit and the voltage that causes thus increases the infringement to radio-frequency switch circuit causing.
In certain embodiments, voltage controller comprises for determining the voltage detecting circuit of electromotive force between antenna and radio-frequency switch circuit.In certain embodiments, voltage controller comprises switch element, and switch element is configured to, when electromotive force surpasses defined threshold, by the voltage source that electromotive force is applied to such as earth terminal, reduce electromotive force.
In certain embodiments, switch element comprises one or more transistorized layouts, such as two or more transistorized arranged in series.In certain embodiments, at least some transistors are the p-type transistors such as p-type MOSFET.In certain embodiments, at least some transistors are the N-shaped transistors such as N-shaped MOSFET.In certain embodiments, switch element comprises the N-shaped MOSFET of 6 arranged in series.
In certain embodiments, radio-frequency switch circuit comprises one or more switch elements, and the switch element of voltage controller is arranged to similar at least one switch element in radio-frequency switch circuit.In certain embodiments, the switch element of radio-frequency switch circuit comprises 6 N-shaped MOSFET of arranged in series, and the switch element of voltage controller comprises 6 N-shaped MOSFET of arranged in series.By this way, the switch element of voltage controller is configured to maintain voltage, and this voltage is substantially equal to the voltage that the switch element by radio-frequency switch circuit maintains.
In certain embodiments, voltage controller comprises a plurality of switch elements.
In certain embodiments, the voltage detecting circuit of voltage controller is configured to starting switch unit.In certain embodiments, voltage detecting circuit is connected to the one or more transistorized grid of switch element.When voltage detecting circuit determines that electromotive force surpasses defined threshold, voltage detecting circuit is applied to each grid by the voltage that is configured to turn-on grid electrode, thereby causes switch element to form short circuit.According to some embodiment, when voltage detecting circuit determines that electromotive force is less than or equal to defined threshold, voltage detecting circuit is applied to each grid by the voltage that is configured to end grid, thereby causes switch element to form open circuit.
In certain embodiments, voltage controller comprises the reference voltage generator such as voltage divider, and this reference voltage generator is configured to antenna based on detecting and the electromotive force generating reference voltage between radio-frequency switch circuit.In certain embodiments, reference voltage is applied to voltage detecting circuit, and voltage detecting circuit is configured to determine based on reference voltage whether electromotive force surpasses defined threshold.
In certain embodiments, in the margin of safety of expectation, the voltage maintaining that defined threshold is set to substantially be configured with radio-frequency switch circuit equates.For example, for GSM cellular device, the power that is connected to the antenna of radio-frequency switch circuit is generally 2 watts.2 watts are substantially equal to 14.1 volts.Therefore, in certain embodiments, radio-frequency switch circuit is configured to maintain the voltage of approximately 15 volts.In certain embodiments, each switch element of radio-frequency switch circuit comprises 6 N-shaped MOSFET, and wherein MOSFET has the rated voltage of 2.5 volts separately, and total rated voltage is 15 volts thus.The voltage that surpasses 15 volts damages radio-frequency switch circuit potentially.Therefore, in certain embodiments, defined threshold is set to larger than 14.1 volts and be less than or equal to 15 volts.For example, by this way, when voltage detecting circuit detects more than 15 volts electromotive forces, voltage controller makes radio-frequency switch circuit ground connection, to alleviate the damage to radio-frequency switch circuit.
Figure 1 illustrates the method 100 that surpasses defined threshold according to the inhibition electromotive force of some embodiment.In certain embodiments, the electromotive force of this method 100 between suppressing antenna and radio-frequency switch circuit (being configured to transmit one or more signals between other circuit at antenna and Wireless Telecom Equipment) has applicability aspect defined threshold.In certain embodiments, defined threshold is the voltage threshold of recommendation voltage that surpasses one or more switch elements of radio-frequency switch circuit.
Method 100 102 in, determine the electromotive force between antenna and radio-frequency switch circuit.In certain embodiments, in 102, determine that electromotive force comprises whether sensing electromotive force surpasses defined threshold.In certain embodiments, determine that electromotive force comprises the electromotive force at radio frequency common node 202 places in survey map 2 in 102, wherein radio frequency common node 202 is at antenna or be connected between the antenna port and radio-frequency switch circuit of antenna.
In method 100 104 in, in response to the electromotive force between antenna and radio-frequency switch circuit, surpass defined threshold, radio-frequency switch circuit is connected to voltage source.Therefore in certain embodiments, voltage source ground connection, when electromotive force during over defined threshold (occurring when in antenna open circuit), radio-frequency switch circuit ground connection.In certain embodiments, voltage source is configured to generate the voltage that is less than defined threshold, to reduce the electromotive force between antenna and radio-frequency switch circuit.
Fig. 2 shows the radio-frequency switch circuit 214 of each embodiment according to the present invention.Radio-frequency switch circuit 214 is connected to voltage controller 212 and comprises 4 switch elements: switch element 204,206,208 and 210.In certain embodiments, radio-frequency switch circuit 214 comprises 4 following switch elements.In certain embodiments, radio-frequency switch circuit 214 comprises 4 above switch elements.Voltage controller 212 is connected to radio frequency common node 202.
The first terminal S6 of switch element 204 and the first terminal of switch element 206 are connected to respectively radio frequency common node 202, and wherein antenna is connected to radio frequency common node 202.The second terminal D6 of switch element 206 is connected to the first terminal D6 of switch element 210, and the second terminal S6 of switch element 210 is connected to the first voltage source 216.The second terminal D6 of switch element 204 is connected to the first terminal D6 of switch element 208, and the second terminal S6 of switch element 208 is connected to second voltage source 218.In certain embodiments, at least one ground connection in the first voltage source 216 and second voltage source 218.
The 3rd terminal V of switch element 204
cthe 3rd terminal V with switch element 210
cvia the first terminal 220, be connected to tertiary voltage source, tertiary voltage source is configured to tertiary voltage to be applied to the 3rd terminal V of switch element 204
cthe 3rd terminal V with switch element 210
c.The 3rd terminal V of switch element 206
cthe 3rd terminal V with switch element 208
cvia the second terminal 222, be connected to the 4th voltage source, the 4th voltage source is configured to the 4th voltage to be applied to the 3rd terminal V of switch element 206
cthe 3rd terminal V with switch element 208
c.In certain embodiments, the 4th voltage is the reverse voltage of tertiary voltage.
In certain embodiments, each switch element 204,206,208 and 210 comprises one or more switch elements.For example, these switch elements comprise one or more suitable electronic switches, such as insulated gate bipolar transistor (IGBT), bipolar junction transistor (BJT), field-effect transistor (FET), mos field effect transistor (MOSFET), grid turn-off thyristor (GTO), integrated grid commutated thyristor (IGCT), bidirectional triode thyristor (TRIAC) etc.For example, Fig. 4 of REFERENCE TO RELATED describes further, and each switch element 204,206,208 and 210 comprises the transistor of arranged in series.The source electrode of the first transistor in this arranged in series is connected to a terminal of switch element, and the last transistorized drain electrode in this arranged in series is connected to another terminal of switch element.Each transistorized grid in this arranged in series is connected to another terminal of switch element.The source electrode of the first transistor in this arranged in series is connected to and is labeled as the terminal of S6 and the last transistorized drain electrode in this arranged in series is connected to the terminal that is labeled as D6.Each transistorized grid in this arranged in series is connected to and is labeled as V
cterminal.
In certain embodiments, for the electromotive force between control antenna and switch element 204,206,208 and 210, voltage controller 212 is connected to radio frequency common node 202.Voltage controller 212 is configured to measure the electromotive force at radio frequency common node 202 places.If voltage surpasses defined threshold, voltage controller 212 is configured to radio frequency common node 202 to be connected to the 5th voltage source 224.In certain embodiments, the 5th voltage source 224 ground connection.By this way, in certain embodiments, suppress the electromotive force at radio frequency common node 202 places in order to avoid surpass the voltage that may damage radio-frequency switch circuit 214 or its various aspects (such as in switch element 204,206,208,210 one or more).
Fig. 3 shows the voltage controller 212 of each embodiment according to the present invention.This voltage controller 212 comprises reference voltage generator 310, voltage detecting circuit 312, switch element 306 and resistor 308.
In certain embodiments, voltage generator 310 is configured to the electromotive force generating reference voltage based on radio frequency common node 202 places.In certain embodiments, voltage generator 310 is the voltage dividers that are configured to generating reference voltage, and the electromotive force at this reference voltage and radio frequency common node 202 places is proportional.For example, voltage generator 310 comprises the first resistor 302 and the second resistor 304.In certain embodiments, the ratio of the value of the value of the first resistor 302 and the second resistor 304 is between approximately between 100 to 1.Therefore, reference voltage is by one of the percentage that is the electromotive force at radio frequency common node 202 places.For example, if the first resistance 302 is approximately 10 kilohms and the second resistance 304 is approximately 100 ohm,, when the electromotive force at radio frequency common node 202 places is approximately 15 volts, reference voltage will be approximately 0.15 volt of ((100/(10000+100)) * 15).
Voltage detecting circuit 312 is configured to use reference voltage to determine the electromotive force at radio frequency common node 202 places, therefore determines the electromotive force between antenna and switch element 204,206,208 and 210.For example, voltage detecting circuit is configured to witness mark voltage to determine whether the electromotive force at radio frequency common node 202 places surpasses defined threshold.When reference voltage surpasses the second defined threshold, show that thus the electromotive force at radio frequency common node 202 places surpasses defined threshold, voltage detecting circuit 312 is configured to generate and makes switch element 306 radio frequency common node 202 is connected to the signal of the 5th voltage source 224.For example, in response to the reference voltage detecting, surpass the second defined threshold, voltage detecting circuit 312 is configured to the voltage of starting switch unit 306 to be applied to the terminal V of switch element 306
cthereby, make switch element 306 that radio frequency common node 202 is connected to the 5th voltage source 224.In certain embodiments, radio frequency common node 202 is connected to the electromotive force that the 5th voltage source 224 is configured to reduce radio frequency common node 202 places.
In certain embodiments, the 5th voltage source 224 ground connection.And, in certain embodiments, when opening with convenient switch element 306 between switch element 306 and the 5th voltage source 224, resistor controls load impedance.In certain embodiments, the resistance of resistor 308 is approximately 50 ohm.
In certain embodiments, switch element 204,206,208,210 and 306 has same or analogous structure.Fig. 4 shows the exemplary arrangement 400 of at least one switch element in switch element 204,206,208,210 and 306.Arrange that 400 comprise the transistor 402,406,410,414,418 and 422 of 6 arranged in series.In certain embodiments, one or more transistors comprise N-shaped MOSFET.In certain embodiments, each transistor 402,406,410,414,418 and 422 has the rated voltage of approximately 2.5 volts.In certain embodiments, the rated voltage of switch element is the transistor 402,406,410,414,418 of switch element and 422 rated voltage sum.For example, when the rated voltage of each transistor 402,406,410,414,418 and 422 is approximately 2.5 volts, the rated voltage of switch element is approximately 15 volts (2.5*6).
Each transistor 402,406,410,414,418 and 422 grid are connected to terminal V
c, wherein voltage is applied to terminal V
cwith conducting or "off" transistor 402,406,410,414,418 and 422.In certain embodiments, one or more resistors or other electronic components are arranged on terminal V
cand between one or more transistors 402,406,410,414,418 and 422.For example, in arranging 400, each transistor 402,406,410,414,418 and 422 grid are connected to resistor 404,408,412,416,422 and 424.
The drain electrode of arranging the first transistor 402 in 400 is connected to terminal D6, and arranges that the source electrode of the last transistor 422 in 400 is connected to terminal S6.Resistor 404, resistor 408, resistor 412, resistor 416, resistor 420 and resistance 424 devices are connected to respectively the some V of switch element
c, wherein, the end points V of switch element
cbe arranged in the side of each resistor away from transistorized grid.
In certain embodiments, by using silicon-on-insulator (SOI) technology, implement voltage controller.
In certain embodiments, voltage controller is embodied as to independently solution, makes except auxiliary voltage controller, need hardly Wireless Telecom Equipment to carry out any change.
In certain embodiments, voltage controller comprises than the less area (area) of other schemes (such as the quantity of transistor and resistance in increase switch element).
According to some embodiment, provide a kind of voltage controller for radio-frequency switch circuit.This voltage controller comprises the voltage detecting circuit that is configured to determine electromotive force between antenna and radio-frequency switch circuit.This voltage controller also comprises and being configured to when electromotive force surpasses defined threshold, by electromotive force being applied to the switch element that voltage source reduces electromotive force.
According to some embodiment, provide a kind of method of determining electromotive force between antenna and radio-frequency switch circuit that comprises.The method also comprises when electromotive force surpasses defined threshold, makes radio-frequency switch circuit be connected to voltage source.
According to some embodiment, provide a kind of device for Wireless Telecom Equipment.This device comprises the radio-frequency switch circuit that is configured to transmit one or more signals between other circuit of antenna and radio communication device.This device also comprises and is configured to determine between radio-frequency switch circuit and antenna that electromotive force is with the voltage controller of identification antenna open circuit.
Although by for the language description of architectural feature and/or methodology behavior this theme, should be appreciated that the theme of the claim of enclosing needn't be restricted to above-mentioned special characteristic or behavior.On the contrary, above-mentioned special characteristic and behavior are disclosed as the exemplary form that realizes at least some claims.
The various operations of embodiment are provided in the present invention.The order of some or all operations of describing should not be interpreted as representing that these operations must be order dependent.Should be realized that, sequence is replaced and is conducive to this explanation.And, should be appreciated that not all operations all must appear in each embodiment provided by the invention.In addition, should be appreciated that not all operations all must be in certain embodiments.
In addition, except as otherwise noted, otherwise the expections such as " first ", " second " do not represent time domain, region, sequence etc.On the contrary, this term is only as the sign for parts, element, material etc., title etc.For example, the first raceway groove and the second raceway groove are conventionally corresponding to raceway groove A and raceway groove B or two similar and different raceway grooves or same raceway groove.
Should be realized that, for example, in order to simplify and easy to understand, herein, layer, parts or element are shown as the specific dimensions having with another one Size dependence, such as physical dimension and/or orientation, and the actual size of identical things is substantially different from the size illustrating herein in certain embodiments.
In addition, " exemplary " in this article for representing as example, example, explanation etc., and differ be decided to be favourable.As used in this application, " or " be intended to represent to comprise " or " rather than get rid of " or ".In addition, except as otherwise noted or according to based on context can being clearly derived as singulative, otherwise " one " that uses in the application and " one " ordinary solution is interpreted as expression " one or more ".And, at least one ordinary representation A or B or A and B among A and B etc.And, using to a certain extent " comprising ", " having ", " having ", " having " or their distortion, this term is contemplated to inclusive, is similar to term and " comprises ".
In addition, although illustrate and described the present invention in conjunction with one or more execution modes, those of ordinary skills are based on easily expecting equivalent substitution and modification to the reading of this specification and accompanying drawing and understanding.The present invention includes all this modifications and substitute and it is only limited by the scope of following claim.More specifically, for example, for by above-mentioned parts (, element, resource etc.) the various functions carried out, for describing the term of these parts, be intended to (for example implement described parts corresponding to (except as otherwise noted), any parts of specific function functional equivalent), even be not structurally equal to disclosed structure.In addition, although with respect to one in some execution modes, special characteristic of the present invention is disclosed, this feature can with one or more other Feature Combinations of other execution modes, this be any given or particular applications expectation and be favourable.
Claims (10)
1. for a voltage controller for radio-frequency switch circuit, comprising:
Voltage detecting circuit, is configured to determine the electromotive force between antenna and described radio-frequency switch circuit; And
Switch element, is configured to, when described electromotive force surpasses defined threshold, by described electromotive force is applied to voltage source, reduce described electromotive force.
2. voltage controller according to claim 1, described voltage source ground connection.
3. voltage controller according to claim 1, comprises and being configured to based on described electromotive force and the reference voltage generator of generating reference voltage.
4. voltage controller according to claim 3, described voltage detecting circuit is configured to determine described electromotive force based on described reference voltage.
5. voltage controller according to claim 3, described reference voltage generator comprises voltage divider.
6. voltage controller according to claim 1, described switch element comprises the first transistor.
7. voltage controller according to claim 1, described switch element comprises the first transistor of connecting with transistor seconds.
8. voltage controller according to claim 1, described radio-frequency switch circuit comprises the first switch element and second switch unit.
9. a method, comprising:
Determine the electromotive force between antenna and radio-frequency switch circuit; And
In response to described electromotive force surpasses defined threshold, described radio-frequency switch circuit is connected to voltage source.
10. for a device for Wireless Telecom Equipment, comprising:
Radio-frequency switch circuit, is configured to transmit one or more signals between other circuit of antenna and described Wireless Telecom Equipment; And
Voltage controller, is configured to determine that electromotive force between described radio-frequency switch circuit and described antenna is to identify antenna open circuit.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361799390P | 2013-03-15 | 2013-03-15 | |
| US61/799,390 | 2013-03-15 | ||
| US13/972,217 US9634659B2 (en) | 2013-03-15 | 2013-08-21 | Voltage controller for radio-frequency switch |
| US13/972,217 | 2013-08-21 |
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| Publication Number | Publication Date |
|---|---|
| CN104052442A true CN104052442A (en) | 2014-09-17 |
| CN104052442B CN104052442B (en) | 2018-10-23 |
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|---|---|---|---|
| CN201310595454.3A Active CN104052442B (en) | 2013-03-15 | 2013-11-22 | Voltage controller for RF switch |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503591A (en) * | 2002-11-08 | 2004-06-09 | Tdk��ʽ���� | Front-end module and communication terminal |
| US20090268360A1 (en) * | 2008-04-25 | 2009-10-29 | Hitachi, Ltd. | Protection circuit |
-
2013
- 2013-11-22 CN CN201310595454.3A patent/CN104052442B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503591A (en) * | 2002-11-08 | 2004-06-09 | Tdk��ʽ���� | Front-end module and communication terminal |
| US20090268360A1 (en) * | 2008-04-25 | 2009-10-29 | Hitachi, Ltd. | Protection circuit |
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| CN104052442B (en) | 2018-10-23 |
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