CN106612113B - Radio frequency switch circuit for improving isolation between opened branches - Google Patents
Radio frequency switch circuit for improving isolation between opened branches Download PDFInfo
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- CN106612113B CN106612113B CN201510687893.6A CN201510687893A CN106612113B CN 106612113 B CN106612113 B CN 106612113B CN 201510687893 A CN201510687893 A CN 201510687893A CN 106612113 B CN106612113 B CN 106612113B
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- 238000002955 isolation Methods 0.000 title claims abstract description 14
- 230000008054 signal transmission Effects 0.000 description 7
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Abstract
The application provides a radio frequency switch circuit for improving isolation between opened branches, which comprises a plurality of switch branches connected in parallel, wherein each switch branch comprises a first switch SE and a second switch SH which are connected in series, the input end of the first switch is connected with a signal input end RFC, the output end of the second switch is connected with the ground potential, and the signal output end RF is connected between the first switch and the second switch; the control circuit can independently control the on-off of the first switch and the second switch; when the first switch of one switch branch is closed, the second switch of the branch is disconnected, the first switches and the second switches of the other switch branches are disconnected, and the control circuit provides direct-current voltage bias to enable the second switches to be in high impedance, so that the isolation degree among the opened branches is improved.
Description
Technical Field
The application belongs to the technical field of microelectronics, and particularly relates to a high-isolation radio frequency switch and a circuit implementation thereof.
Background
The radio frequency switch is widely applied to a radio frequency transceiving circuit, is an indispensable module, and can realize the functions of frequency band switching, antenna tuning, impedance tuning and the like. In the prior art, adjacent signal branches for transmitting radio frequency signals are prone to generate crosstalk, and the isolation between each switch branch including a radio frequency switch is poor, so that the radio frequency signals on the switch branches are prone to generate crosstalk and loss, and the output quality of the radio frequency signals is poor.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
Disclosure of Invention
The technical problem that this application will solve is, provide a radio frequency switch circuit who improves isolation between the branch road of opening, this radio frequency switch circuit has characteristics such as the loss is low and isolation height than traditional switch circuit.
In order to solve the above technical problem, according to an aspect of the embodiments of the present application, there is provided a radio frequency switch circuit for improving isolation between open branches, wherein: the circuit comprises a plurality of parallel switch branches, wherein each switch branch comprises a first switch SE and a second switch SH which are connected in series, the input end of the first switch is connected with a signal input end RFC, the output end of the second switch is connected with the ground potential, and the signal output end RF is connected between the first switch and the second switch; the control circuit can independently control the on-off of the first switch and the second switch; when the first switch of one switch branch is closed, the second switch of the branch is disconnected, and the first switches and the second switches of the other switch branches are disconnected.
According to another aspect of the embodiments of the present application, the first switch of each switching branch comprises a plurality of MOSFET transistors connected in series, and the second switch of each switching branch comprises m MOSFET transistors connected in series, wherein the input terminal of the 1 st MOSFET transistor is connected to the first switch, the output terminal of the m MOSFET transistor is connected to the ground potential, and m ≧ 2.
According to another aspect of an embodiment of the present application, the gate of each MOSFET transistor in the first switch is connected to VC of the control circuitaTerminal connection, gate of 1 st to k th MOSFET transistor in second switch and VC of control circuitbVC with terminals connected to (k +1) th to (m) th switches and control circuitcThe ends are connected, k is more than or equal to 1 and less than or equal to m-1, when all MOSFET transistors in the first switch of one switch branch are switched on, all MOSFET transistors in the second switch in the switch branch are switched off, all MOSFET transistors in the first switches of the other switch branches are switched off, the 1 st to k th MOSFET transistors in the second switch are switched on, and the k +1 th to m MOSFET transistors are switched off.
According to another aspect of the embodiment of the present application, it is preferable that when m is an even number, k is m/2, and when m is an odd number, k is (m + 1)/2.
The beneficial effect of this application lies in: the plurality of switch branches of the radio frequency switch circuit comprise a first switch connected with the signal output end in series and a second switch connected with the signal output end in parallel, when the first switch of one switch branch is switched on, the rest switch branches are switched on, and the control circuit provides direct current voltage bias to enable the second switches of the rest switch branches to present high impedance, so that the purpose of improving isolation degree among the switch branches switched on in the radio frequency switch circuit is achieved.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a radio frequency switch circuit for improving isolation between open branches according to the present application;
FIG. 2 is a schematic diagram of a single-pole multi-throw RF switch circuit implemented with MOSFET transistors according to the present application;
FIG. 3 is the RF of FIG. 21Schematic diagram of equivalent circuit when branch is closed.
Detailed Description
The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.
The rf switching circuit shown in fig. 1 includes n parallel switching branches and a control circuit. The switching branch i comprises a first switch SEi and a second switch SHI which are connected in series, and a signal output end RFi is connected between the first switch and the second switch; the control circuit can independently control the on-off of the first switch and the second switch.
RFC is radio frequency signal input end, [ RF ]1,RF2,RF3…RFn]A first switch [ SE ] respectively having n RF signal output terminals and connected in series with each signal output terminal1,SE2,SE3…SEn]A second switch [ SH ] connected to the signal input terminals RFC respectively and connected in parallel to each signal output terminal1,SH2,SH3…SHn]Respectively connected to signal ground. When RF1When the signal transmission branch is closed, i.e. the first switch SE1When closed, the path of the radio frequency signal is from RFC input to RF1And outputting, and not closing paths from the RFC to the rest signal output ends. At this time, RF1Of the signal transmission branch1Closed, second switch SH1Disconnecting; first switches [ SE ] of other signal transmission branches2,SE3…SEn]Are all open, the second switch [ SH ]2,SH3…SHn]And also open. The control signals of the first switch and the second switch are provided by a control circuit. The on-off conditions of the first switch and the second switch when the other signal transmission branches are closed are similar to the above-mentioned conditions.
FIG. 2 is a specific circuit diagram of a single-pole multi-throw RF switch implemented with MOSFET transistors, the first switch of each switch branch being formed by i MOSFET transistors connected in series, eachThe second switch of the switching branch is formed by m MOSFET transistors which are connected in series. The control circuit provides a plurality of direct current voltage control signals: [ VC ]1a,VC2a,VC3a…VCna]Respectively control the first switch tube [ M ]11,M21,M31,…Mn1](each consisting of i MOSFET transistors connected in series), [ VC [1b,VC2b,VC3b…VCnb]Respectively control the second switch tube [ M ]12,M22,M32,…Mn2](each consisting of k MOSFET transistors connected in series), [ VC ]1c,VC2c,VC3c…VCnc]Respectively control the third switch tube [ M ]13,M23,M33,…Mn3](each consisting of m-k MOSFET transistors connected in series). When RF1When the signal transmission branch circuit is closed, the first switch tube M in the first switch branch circuit11All are conducted, the second switch tube M12And a third switching tube M13All are disconnected; first switch tube [ M ] of other switch branch21,M31,…Mn1]Are all disconnected, the second switch tube [ M ]22,M32,…Mn2]All are disconnected, the third switch tube [ M ]23,M33,…Mn3]Are all turned on. Wherein, preferably, when m is an even number, k is m/2, and when m is an odd number, k is (m + 1)/2.
FIG. 3 is the RF in FIG. 21The signal transmission branch circuit is equivalent to a capacitor when the MOSFET transistor is turned off and is equivalent to a resistor when the MOSFET transistor is turned on. Non-conductive signal transmission path RF2,RF3…RFnThe second switch in the circuit is equivalent to the series connection of a resistor R and a capacitor C, and the RC series circuit presents very high impedance, so that the isolation between the opened switch branches can be greatly improved, and the output quality of radio frequency signals is ensured.
In the above technical solution provided by the present application, each switch branch includes a first switch and a second switch connected in series, and a signal output end is connected between the first switch and the second switch; when the first switch of one of the switch branches is conducted, the other switch branches are opened, and the control circuit provides direct-current voltage bias to enable the second switches of the other switch branches to present high impedance, so that the aim of improving the isolation degree among the switch branches opened in the radio frequency switch circuit is fulfilled.
The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.
Claims (1)
1. The utility model provides a radio frequency switch circuit of isolation between improvement open branch road which characterized in that:
the radio frequency switch circuit includes:
the circuit comprises a plurality of parallel switch branches, each switch branch comprises a first switch and a second switch which are connected in series, wherein the input end of the first switch is connected with a signal input end, the output end of the second switch is connected with the ground potential, and the signal output end is connected between the first switch and the second switch; and
the control circuit can independently control the on-off of the first switch and the second switch;
wherein when the first switch of one switch branch is closed, the second switch of the branch is opened, the first switches and the second switches of the other switch branches are opened,
the first switch of each switching branch comprises a plurality of series-connected MOSFET transistors, the second switch of each switching branch comprises m series-connected MOSFET transistors, wherein in the second switch, the input end of the 1 st MOSFET transistor is connected with the first switch, the output end of the m < th > MOSFET transistor is connected with the ground potential, and m is ≧ 2,
VC for the gate of each MOSFET transistor in the first switch and the control circuitaTerminal connection, gate of 1 st to k th MOSFET transistor in second switch and VC of control circuitbVC with terminals connected to (k +1) th to (m) th switches and control circuitcEnd connection, k is more than or equal to 1 and less than or equal to m-1, wherein when a switch branch is connectedAll MOSFET transistors in the second switch in the switching leg are off, all MOSFET transistors in the first switches in the remaining switching legs are off, the 1 st to k th MOSFET transistors in the second switches are on, the k +1 th to m th MOSFET transistors are off,
when m is an even number, k is m/2, and when m is an odd number, k is (m + 1)/2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510687893.6A CN106612113B (en) | 2015-10-21 | 2015-10-21 | Radio frequency switch circuit for improving isolation between opened branches |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510687893.6A CN106612113B (en) | 2015-10-21 | 2015-10-21 | Radio frequency switch circuit for improving isolation between opened branches |
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| CN106612113A CN106612113A (en) | 2017-05-03 |
| CN106612113B true CN106612113B (en) | 2020-08-21 |
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| CN107040280A (en) * | 2017-05-15 | 2017-08-11 | 尚睿微电子（上海）有限公司 | A kind of RF switch and its control method |
| CN111130519B (en) * | 2020-01-03 | 2023-01-31 | 广州慧智微电子股份有限公司 | Switch circuit, control method, device, radio frequency switch and readable storage medium |
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| JP2006129025A (en) * | 2004-10-28 | 2006-05-18 | Matsushita Electric Ind Co Ltd | Semiconductor integrated circuit and trimming method thereof |
| CN101388682A (en) * | 2007-09-14 | 2009-03-18 | 三星电机株式会社 | Antenna switch system, method and apparatus |
| CN203387476U (en) * | 2013-08-30 | 2014-01-08 | 电子科技大学 | Attenuator circuit structure |
| CN104604135A (en) * | 2012-07-07 | 2015-05-06 | 天工方案公司 | Circuits, devices and methods related to silicon-on-insulator based radio frequency switches and combinations thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9276570B2 (en) * | 2012-07-07 | 2016-03-01 | Skyworks Solutions, Inc. | Radio-frequency switch having gate node voltage compensation network |
| US9654094B2 (en) * | 2014-03-12 | 2017-05-16 | Kabushiki Kaisha Toshiba | Semiconductor switch circuit and semiconductor substrate |
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| JP2006129025A (en) * | 2004-10-28 | 2006-05-18 | Matsushita Electric Ind Co Ltd | Semiconductor integrated circuit and trimming method thereof |
| CN101388682A (en) * | 2007-09-14 | 2009-03-18 | 三星电机株式会社 | Antenna switch system, method and apparatus |
| CN104604135A (en) * | 2012-07-07 | 2015-05-06 | 天工方案公司 | Circuits, devices and methods related to silicon-on-insulator based radio frequency switches and combinations thereof |
| CN203387476U (en) * | 2013-08-30 | 2014-01-08 | 电子科技大学 | Attenuator circuit structure |
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