CN107517060B - Radio frequency switch circuit and method for processing radio frequency signal - Google Patents
Radio frequency switch circuit and method for processing radio frequency signal Download PDFInfo
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- CN107517060B CN107517060B CN201710872688.6A CN201710872688A CN107517060B CN 107517060 B CN107517060 B CN 107517060B CN 201710872688 A CN201710872688 A CN 201710872688A CN 107517060 B CN107517060 B CN 107517060B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
Abstract
The invention discloses a radio frequency switch circuit, comprising: a common terminal and at least two switching branches; the common terminal is used for receiving radio frequency signals and inputting the radio frequency signals to the switch branches corresponding to the frequency of the radio frequency signals; the switch branch circuit is used for transmitting the radio frequency signal when being conducted; and suppressing harmonic components of the radio frequency signal during transmission of the radio frequency signal. The invention also discloses a method for processing the radio frequency signal by the radio frequency switch circuit.
Description
Technical Field
The present invention relates to mobile communication technology, and more particularly, to a Radio Frequency (RF) switching circuit and a method of processing an RF signal.
Background
With the development of mobile communication technology, from the development of communication protocols such as second Generation mobile phone communication technology (2g, 2-Generation wireless telephone technology), third Generation mobile communication technology (3g, 3rd-Generation), long Term Evolution (LTE) of universal mobile communication technology to fifth Generation wireless broadband transmission technology (5g, 5th-Generation), communication frequency bands are increasing, frequency span is also from 700MHz to 6GHz, and it is expected that the coming 5G will have more than 100 frequency bands. Due to the numerous frequency bands and the large frequency span, a Multi-Mode Multi-Band (MMMB) Power Amplifier (PA) becomes the mainstream, which not only provides challenges for the design of the PA, but also provides more important requirements for the RF switch circuit.
FIG. 1 is a schematic diagram of the connection of a PA, an impedance matching network and an RF switch circuit; in fig. 1, the RF switch circuit not only needs to satisfy the requirements of small insertion loss and good isolation in the whole frequency band, but also needs to satisfy the requirement of good impedance matching of each path, so that the PA can work normally.
However, as the number of branch ports of the PA increases, the operating frequency increases, and the signal loss of the conventional RF switch circuit is large in the process of transmitting RF signals, which affects the signal transmission quality and transmission distance; furthermore, the isolation of the branches in conventional RF switching circuits begins to deteriorate as the frequency of the RF signal increases.
Disclosure of Invention
To solve the existing technical problems, embodiments of the present invention provide an RF switch circuit and a method for processing an RF signal by the RF switch circuit.
The technical scheme of the invention is realized as follows:
an embodiment of the present invention provides an RF switch circuit, including: a common terminal and at least two switching branches;
the common terminal is used for receiving an RF signal and inputting the RF signal to a switch branch circuit corresponding to the frequency of the RF signal;
the switch branch circuit is used for transmitting the RF signal when being conducted; and suppressing harmonic components of the RF signal during transmission of the RF signal.
In the above scheme, the switch branch is further configured to stop transmitting the RF signal when being turned off, and filter energy leaked when other switch branches except the switch branch transmit the RF signal.
In the above solution, the switching branch includes: a series branch and a parallel branch;
the series branch is used for transmitting the RF signal when being conducted;
the parallel branch is used for suppressing harmonic components of the RF signal in the process of transmitting the RF signal by the series branch.
In the above scheme, the parallel branch is specifically configured to resonate at a second harmonic or a third harmonic of a frequency band corresponding to an RF signal transmitted by the series branch in a manner of connecting a capacitor and an inductor in series.
In the above solution, the switching branch includes: a series branch and a parallel branch; the parallel branch comprises: a first branch and a second branch;
the series branch circuit is used for stopping transmitting the RF signal when being switched off;
the first branch circuit is used for filtering energy leaked when other switch branch circuits except the first branch circuit transmit RF signals in an inductance grounding mode when the series branch circuit is switched off;
and the second branch circuit is used for filtering energy leaked when other switch branch circuits except the second branch circuit transmit the RF signals in a mode of serially connecting a capacitor and an inductor to be grounded when the serial branch circuit is switched off.
An embodiment of the present invention further provides a method for processing an RF signal by an RF switch circuit, where the RF switch circuit includes: a common terminal and at least two switching branches; the method comprises the following steps:
the common terminal receives an RF signal and inputs the RF signal to a switch branch circuit corresponding to the frequency of the RF signal;
transmitting the RF signal when the switching branch is turned on; and suppressing harmonic components of the RF signal during transmission of the RF signal.
In the above scheme, the method further comprises:
and when the switch branch is switched off, the transmission of the RF signal is stopped, and energy leaked when other switch branches except the switch branch transmit the RF signal is filtered.
In the above solution, the switch branch includes: a series branch and a parallel branch;
the transmitting the RF signal includes: transmitting the RF signal when the series branch is turned on;
the suppressing harmonic components of the RF signal in the process of transmitting the RF signal includes:
the parallel branch suppresses harmonic components of the RF signal during transmission of the RF signal by the series branch.
In the foregoing solution, the parallel branch suppressing the harmonic component of the RF signal in the process of transmitting the RF signal by the series branch includes:
and the parallel branch circuit resonates on the second harmonic or the third harmonic of the frequency band corresponding to the RF signal transmitted by the series branch circuit in a way of connecting a capacitor and an inductor in series in the process of transmitting the RF signal by the series branch circuit.
In the above solution, the switching branch includes: a series branch and a parallel branch; the parallel branch comprises: a first branch and a second branch;
the energy that leaks when filtering other switch branch road except oneself when transmitting RF signal includes:
when the series branch is switched off, the first branch filters energy leaked when other switch branches except the first branch transmit RF signals in an inductance grounding mode; and a (C) and (D) and,
when the series branch is switched off, the second branch filters energy leaked when other switch branches except the second branch transmit RF signals in a mode of serially connecting a capacitor and an inductor to be grounded.
The RF switch circuit and the method for processing the RF signal provided by the embodiment of the invention comprise the following steps: a common terminal and at least two switching branches; the common terminal is used for receiving an RF signal and inputting the RF signal to a switch branch circuit corresponding to the frequency of the RF signal; the switch branch circuit is used for transmitting the RF signal when being conducted; and suppressing harmonic components of the RF signal in the course of transmitting the RF signal. The scheme provided by the embodiment of the invention can inhibit harmonic components of the RF signals, improve the harmonic problem, reduce the loss of signal transmission and improve the transmission quality of the RF signals.
In addition, in the scheme of the embodiment of the present invention, the switch branches are further configured to stop transmitting the RF signal when being turned off, and filter energy leaked when other switch branches except the switch branches transmit the RF signal, so that other signals in the switch branches can be filtered, and isolation between the switch branches is improved.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
FIG. 1 is a schematic diagram of the connection of a PA, an impedance matching network and an RF switch circuit;
FIG. 2 is a schematic diagram of a conventional RF switch circuit;
FIG. 3 is a schematic diagram of a conventional RF switch circuit in a chip package;
fig. 4 is a schematic structural diagram of a first RF switch circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second RF switch circuit according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a first variable capacitor according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second variable capacitor according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a variable capacitor iii according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a method for processing an RF signal by an RF switch circuit according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
FIG. 2 is a schematic diagram of a conventional RF switch circuit; as shown in fig. 2, the conventional RF switching circuit includes: a common terminal and at least two switching branches; the switching branch comprises: a series branch and a parallel branch; the series branch is used for transmitting an RF signal when being conducted; the parallel branch is used for improving the isolation between the switch branches. However, in a high-frequency application scenario, the impedance of the switch of the parallel branch cannot be grounded well due to an inductance effect of a gold wire bond (bond wire) and a parasitic effect of the switch, and the parallel branch cannot effectively conduct a signal to ground, thereby causing poor isolation between the switch branches.
Here, the series branch and the parallel branch each include a switch; an external switch control circuit respectively controls the switch of the series branch and the switch of the parallel branch through in-phase logic and reverse-phase logic; that is, the state logics of the serial branch and the parallel branch are opposite, and when one switch is closed, the other switch is opened.
FIG. 3 is a schematic diagram of a conventional RF switch circuit in a chip package; as shown in fig. 3, in the conventional RF switching circuit, each switching leg is led out by a bonding wire and connected to a chip pin.
In various embodiments of the present invention, an RF switching circuit, comprising: a common terminal and at least two switching branches; the common terminal is used for receiving an RF signal and inputting the RF signal to a switch branch circuit corresponding to the frequency of the RF signal; the switch branch is used for transmitting the RF signal when being conducted; and suppressing harmonic components of the RF signal in the course of transmitting the RF signal.
Fig. 4 is a schematic structural diagram of a first RF switch circuit according to an embodiment of the present invention; as shown in fig. 4, the RF switching circuit includes: a common terminal and at least two switching branches; wherein, the first and the second end of the pipe are connected with each other,
the common terminal is used for receiving an RF signal and inputting the RF signal to a switch branch circuit corresponding to the frequency of the RF signal;
the switch branch is used for transmitting the RF signal when being conducted; and suppressing harmonic components of the RF signal during transmission of the RF signal.
Specifically, the switching branch comprises: a series branch and a parallel branch;
the series branch is used for transmitting the RF signal when being conducted;
the parallel branch is used for suppressing harmonic components of the RF signal in the process of transmitting the RF signal by the series branch.
Specifically, the parallel branch is specifically configured to resonate at a second harmonic or a third harmonic of a frequency band corresponding to an RF signal transmitted by the series branch in a manner of connecting a capacitor and an inductor in series; thereby achieving the effect of suppressing harmonic components of the RF signal.
Specifically, the switch branch is further configured to stop transmitting the RF signal when the switch branch is turned off, and filter out energy leaked when other switch branches except the switch branch transmit the RF signal.
Specifically, the switching branch comprises: a series branch and a parallel branch;
the series branch circuit is used for stopping transmitting the RF signal when being switched off;
the parallel branch is used for filtering energy leaked when other switch branches except the parallel branch transmit the RF signals when the serial branch stops transmitting the RF signals; therefore, good grounding of the parallel branch circuits is ensured, and the isolation between the switch branch circuits is improved.
In the embodiment of the present invention, the parallel branch may specifically include: a first branch and a second branch;
when the switching branch is turned off, the series branch is in a disconnected state, and the first branch and the second branch are in a conducting state;
the first branch circuit is used for filtering energy leaked when other switch branch circuits except the first branch circuit transmit RF signals in an inductance grounding mode;
the second branch circuit is used for filtering energy leaked when other switch branch circuits except the second branch circuit transmit the RF signals in a mode of grounding by connecting a capacitor and an inductor in series;
carry out filtering through first branch road and second branch road jointly, promote the filtering effect, guarantee that the branch road ground connection that connects in parallel is good, improve the isolation between each switch branch road.
When the switching branch is switched on, the series branch is in a conducting state, the first branch is in a disconnecting state, and the second branch is in a conducting state;
the second branch circuit is used for resonating on the second harmonic or the third harmonic of the frequency band corresponding to the RF signal transmitted by the series branch circuit in a way of connecting a capacitor and an inductor in series; thereby suppressing harmonic components of the RF signal transmitted by the series branch.
Specifically, one end of the common terminal of the RF switch circuit is connected to an impedance matching network;
one end of the series branch is connected with the common end, and the other end of the series branch is connected with an antenna;
one end of the parallel branch is connected with the series branch, and the other end of the parallel branch is grounded;
the parallel branch comprises: a first branch and a second branch;
the first branch, comprising: a first inductor;
the second branch circuit comprises: the variable capacitor and the second inductor are connected in series;
a switch is arranged at the connecting end of the serial branch and the common end;
a switch is arranged at the connecting end of the first branch and the series branch; that is, the first branch may include: a first switch and a first inductor connected in series;
a switch is arranged at the connecting end of the second branch and the series branch; that is, the second branch may include: the second switch, the variable capacitor and the second inductor are connected in series;
the other ends of the first inductor and the second inductor are grounded.
It should be noted that, a control circuit may be provided for the RF switch circuit, and the control circuit is configured to send a first control signal to the RF switch circuit to control the serial branch, the first branch, and the second branch of the switch branch to be in an off state or an on state, respectively; the RF switch circuit receives a first control signal, and determines that a series branch, a first branch and a second branch of the switch branches are in an off state or an on state respectively according to the first control signal.
Specifically, the control circuit detects whether the switching branch needs to transmit an RF signal, and when it is determined that the switching branch does not transmit the RF signal, the switching branch is turned off, and the control circuit sends a first control signal to control the switch of the series branch to be turned off, the switch of the first branch to be turned on, and the switch of the second branch to be turned on; when the switching branch is determined to transmit the RF signal, the switching branch is conducted, and the control circuit sends a first control signal to control the switch of the series branch to be closed, the switch of the first branch to be opened and the switch of the second branch to be closed.
The control circuit is further configured to send a second control signal to the RF switching circuit to control values of capacitance and inductance in the switching branch; the RF switch circuit receives a second control signal and adjusts the values of the variable capacitor and the second inductor according to the second control signal.
Specifically, when the switching branch is turned on, the control circuit determines the frequency of the RF signal transmitted by the series branch, determines, according to the frequency of the RF signal, a capacitance value of the variable capacitor and an inductance value of the second inductor when the second branch resonates at a second harmonic or a third harmonic of a frequency band corresponding to the RF signal transmitted by the series circuit, and sends a second control signal to the switching branch according to the capacitance value and the inductance value to adjust the magnitudes of the variable capacitor and the second inductor; the switching branch circuit adjusts the resonant frequency of the second branch circuit to the resonant frequency corresponding to the second harmonic or the third harmonic of the frequency band corresponding to the RF signal according to the second control signal, so that the second branch circuit resonates at the second harmonic or the third harmonic of the frequency band corresponding to the RF signal, thereby suppressing the harmonic component of the RF signal;
when the switching branch is turned off, the control circuit calculates a capacitance value of the variable capacitor and an inductance value of the second inductor when the resonance frequency of the second branch is the working frequency, and sends a second control signal to the switching branch according to the capacitance value and the inductance value so as to adjust the size of the variable capacitor and the second inductor, so that the parallel branch can effectively filter energy leaked when other switching branches except the parallel branch transmit the RF signals.
Fig. 5 is a schematic structural diagram of a second RF switch circuit according to an embodiment of the present invention; as shown in fig. 5, the RF switching circuit includes: a common terminal and at least two switching branches; wherein the content of the first and second substances,
the switching branch comprises: the device comprises a series branch and a parallel branch, wherein one end of the parallel branch is connected with the series branch, and the other end of the parallel branch is grounded;
the parallel branch comprises: a first branch and a second branch;
the first branch, comprising: a first inductor;
the second branch circuit comprises: the variable capacitor and the second inductor are connected in series;
specifically, a switch is arranged at the connecting end of the serial branch and the common end;
a switch is arranged at the connecting end of the first branch and the series branch; that is, the first branch may include: a first switch and a first inductor connected in series;
a switch is arranged at the connecting end of the second branch and the series branch; that is, the second branch may include: the second switch, the variable capacitor and the second inductor are connected in series;
the other ends of the first inductor and the second inductor are grounded.
Here, the first inductance and the second inductance may be replaced with a ground bond wire of a packaged integrated circuit die (die) to a substrate. The inductance values of the first inductor and the second inductor can be adjusted by adjusting the height, the length and the shape of the bonding wires.
Here, the second branch composed of the variable capacitor and the second inductor may be used as a trap (trap), and the resonance frequency of the second branch may be adjusted by changing the size of the second inductor and/or the variable capacitor, so as to achieve the effect of optimizing the harmonic of each switching branch.
Specifically, the variable capacitor may be a PN Junction (p +/n-well Junction) variable capacitor, an insulated gate field effect transistor (MOS) variable capacitor, or a switch-switchable capacitor.
Fig. 6 is a schematic structural diagram of a first variable capacitor according to an embodiment of the present invention; as shown in fig. 6, the first variable capacitor is a PN junction variable capacitor. A P + active region is formed on the N well, so that a PN junction variable capacitor is realized.
The PN junction refers to a space charge region formed by making a hole type (P type) semiconductor and an electron type (N type) semiconductor on the same semiconductor substrate and forming an interface of the hole type (P type) semiconductor and the electron type (N type) semiconductor.
And diffusing an N-type region on the P-type semiconductor substrate to obtain the N well.
Fig. 7 is a schematic structural diagram of a second variable capacitor according to an embodiment of the present invention; as shown in fig. 7, the second variable capacitor is a MOS variable capacitor.
The MOS variable capacitor is an MOS tube with a drain electrode (D) = a source electrode (S) = a substrate (B) connected with three ends, and when a grid source voltage is reduced to 0 from a power supply voltage, the working area of the MOS tube is changed from an accumulation area to a depletion area and then to a strong inversion.
The MOS variable capacitor is mainly a gate oxide layer plate capacitor, and when the MOS variable capacitor works in an accumulation region and a strong inversion region, the capacitance is the maximum value.
Fig. 8 is a schematic structural diagram of a variable capacitor iii according to an embodiment of the present invention; as shown in fig. 8, the variable capacitor three is a switch-switchable capacitor.
The switch switchable capacitor comprises at least two capacitor switch branches connected in parallel; the capacitance switch branch comprises: a capacitor and a switch connected in series.
Fig. 9 is a flowchart illustrating a method for processing an RF signal by an RF switch circuit according to an embodiment of the invention; as shown in fig. 9, the RF switching circuit includes: a common terminal and at least two switching branches; the switching leg has a first state and a second state; the method comprises the following steps:
Specifically, the switching branch comprises: a series branch and a parallel branch;
the transmitting the RF signal includes:
transmitting the RF signal when the series branch is turned on;
the energy that leaks when filtering other switch branch road transmission RF signals except self includes:
the parallel branch suppresses harmonic components of the RF signal during transmission of the RF signal by the series branch.
Specifically, the parallel branch circuit suppresses harmonic components of the RF signal during transmission of the RF signal by the series branch circuit, including:
and the parallel branch circuit resonates on the second harmonic or the third harmonic of the frequency band corresponding to the RF signal transmitted by the series branch circuit in a way of connecting a capacitor and an inductor in series in the process of transmitting the RF signal by the series branch circuit. Thereby suppressing harmonic components of the RF signal.
Specifically, the method further comprises:
and when the switch branch is turned off, the transmission of the RF signal is stopped, and energy leaked when other switch branches except the switch branch transmit the RF signal is filtered.
Specifically, the switching branch comprises: a series branch and a parallel branch; the parallel branch comprises: a first branch and a second branch;
the energy that leaks when filtering other switch branch road except oneself when transmitting RF signal includes:
when the series branch is switched off, the first branch filters energy leaked when other switch branches except the first branch transmit RF signals in an inductance grounding mode;
when the series branch is switched off, the second branch filters energy leaked when other switch branches except the second branch transmit RF signals in a mode of serially connecting a capacitor and an inductor to be grounded.
The RF switch circuit provided by the embodiment of the present invention can be used in the following two application scenarios:
the application scene one: the mobile communication application scenario based on 2G/3G/fourth Generation mobile communication technology (4G, the 4th Generation mobile communication technology) has a frequency of about 700MHz to 3.4GHz.
In the application scenario, due to the large frequency band span, the second harmonic or the third harmonic corresponding to the relatively low frequency band falls on the relatively high frequency band fundamental wave, which affects the normal communication of the high frequency band and causes too large harmonic.
By using the scheme provided by the embodiment of the invention, the effect of adjusting the resonant frequency of the second branch circuit is achieved by adjusting the size of the variable capacitor or the second inductor in the second branch circuit, so that the second branch circuit resonates on the second harmonic wave or the third harmonic wave of the frequency band corresponding to the RF signal transmitted by the series branch circuit, and the harmonic component of the switching branch circuit is effectively reduced.
Here, when the PA operates and passes through a certain switching branch, the switch of the series branch of the switching branch is closed, the switch of the first branch is opened, and the switch of the second branch is closed.
Application scenario two: 5GHz Wireless local area network (WiFi) communication application scenario.
In this application scenario, the frequency is high, the parallel branch of the conventional RF switch circuit only includes the first branch, the RF signal cannot be effectively conducted to the ground, and the isolation between the switch branches is poor. The reason is that: when the PA works and passes through other switch branches, the switch of the first branch cannot be grounded well due to the inductance effect of the bond and the parasitic effect of the switch, so that energy leaked from other switch branches cannot be filtered out completely.
By applying the scheme provided by the embodiment of the invention, except for the first branch circuit, the first branch circuit is used for filtering energy leaked by other switch branch circuits except the first branch circuit, the LC resonance frequency of the second branch circuit is not used for inhibiting harmonic waves when being adjusted to the working frequency, and the first branch circuit is also used for assisting the first branch circuit to filter energy leaked by other switch branch circuits except the first branch circuit, namely, the first branch circuit and the second branch circuit are used for filtering together, so that the isolation degree between the switch branch circuits is effectively improved.
Here, when the RF signal does not pass through the switching legs, the switch of the series leg of the switching legs is opened, the switch of the first leg is closed, and the switch of the second leg is closed.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (14)
1. A radio frequency switch circuit, the radio frequency switch circuit comprising: a common terminal and at least two switching branches; the switch branch comprises a series branch and a parallel branch;
the common terminal is used for receiving a radio frequency signal and inputting the radio frequency signal to a switch branch circuit corresponding to the frequency of the radio frequency signal;
when the switch branch is conducted, the series branch is in a conducting state, and the series branch is used for transmitting the radio frequency signal; the parallel branch is used for suppressing harmonic components of the radio frequency signals;
when the switching branch is turned off, the series branch is in an off state; the parallel branch is used for filtering signals leaked when other switch branches except the parallel branch transmit radio frequency signals.
2. The circuit of claim 1, wherein the parallel branch comprises a first branch and a second branch,
when the switch branch is turned off, the first branch and the second branch are turned on and are used for filtering signals leaked when other switch branches except the first branch transmit radio frequency signals;
when the switch branch is conducted, the first branch is in an off state, and the second branch is in an on state; the second branch is used for suppressing harmonic waves.
3. The circuit of claim 2,
when the switch branch is turned off, the first branch is used for filtering out signals leaked when other switch branches except the first branch transmit radio frequency signals in an inductance grounding mode; the second branch circuit is used for filtering signals leaked when other switch branch circuits except the second branch circuit transmit radio frequency signals in a mode of serially connecting a capacitor and an inductor to be grounded;
when the switch branch circuit is conducted, the second branch circuit is used for resonating on the harmonic wave of the frequency band corresponding to the radio-frequency signal transmitted by the series branch circuit in a mode of connecting a capacitor and an inductor in series, so that the harmonic wave of the radio-frequency signal transmitted by the series branch circuit is suppressed.
4. The circuit of claim 2,
a switch is arranged at the connecting end of the serial branch and the common end and is used for controlling the serial branch to be in a disconnected state or a connected state;
a switch is arranged at the connecting end of the first branch and the series branch and is used for controlling the first branch to be in a disconnected state or a connected state;
and a switch is arranged at the connecting end of the second branch and the series branch and is used for controlling the second branch to be in a disconnected state or a connected state.
5. The circuit of claim 4, wherein the radio frequency switch circuit further comprises: a control circuit;
the control circuit is configured to send a first control signal to the switch branches to control the switches corresponding to the series branches to be turned off, the switches corresponding to the first branches to be turned on, and the switches corresponding to the second branches to be turned on; or, the control circuit is configured to send a first control signal to the switch branches to control the switch corresponding to the series branch to be closed, the switch corresponding to the first branch to be opened, and the switch corresponding to the second branch to be closed.
6. The circuit of claim 5, wherein the second branch comprises a variable capacitor and a second inductor connected in series; the control circuit is further configured to send a second control signal to adjust a capacitance value of the variable capacitor and/or an inductance value of the second inductor,
when the switching branch is turned off, the variable capacitor and the second inductor of the second branch are used for filtering a leaked signal; when the switch branch circuit is conducted, the variable capacitor and the second inductor are used for inhibiting the harmonic waves of the frequency band corresponding to the radio-frequency signals transmitted by the series branch circuit.
7. The circuit of claim 6, wherein the second inductance is implemented by a bond wire.
8. A method for processing a radio frequency signal by a radio frequency switch circuit, the radio frequency switch circuit comprising: a common terminal and at least two switching branches; the switch branches comprise a series branch and a parallel branch; the method comprises the following steps:
the common terminal receives a radio frequency signal and inputs the radio frequency signal to a switch branch circuit corresponding to the frequency of the radio frequency signal;
when the switch branch is switched off, the series branch is in a disconnected state, and the parallel branch filters signals leaked when other switch branches except the parallel branch transmit radio frequency signals;
when the switch branch is conducted, the series branch is in a conducting state, and the series branch transmits the radio-frequency signal; the parallel branch suppresses harmonics.
9. The method of claim 8, wherein the parallel legs comprise a first leg and a second leg,
when the switch branch is turned off, the first branch and the second branch are turned on, and the parallel branch filters signals leaked when other switch branches except the switch branch transmit radio frequency signals, including: the first branch circuit and the second branch circuit filter signals leaked when other switch branch circuits except the first branch circuit and the second branch circuit transmit radio frequency signals;
when the switch branch is conducted, the first branch is in a disconnected state, and the second branch is in a conducting state; the parallel branch circuit suppresses harmonics, including: the second branch suppresses harmonics.
10. The method of claim 9,
the first branch circuit and the second branch circuit filter signals leaked when other switch branch circuits except the second branch circuit transmit radio frequency signals, and the method comprises the following steps: the first branch circuit filters signals leaked when other switch branches except the first branch circuit transmit radio frequency signals in an inductance grounding mode; the second branch circuit filters signals leaked when other switch branch circuits except the second branch circuit transmit radio frequency signals in a mode of grounding by connecting a capacitor and an inductor in series;
the second branch suppresses harmonics, including: the second branch circuit resonates on the harmonic wave of the frequency band corresponding to the radio-frequency signal transmitted by the series branch circuit in a mode of connecting a capacitor and an inductor in series, and therefore the harmonic wave of the radio-frequency signal transmitted by the series branch circuit is suppressed.
11. The method of claim 9, wherein a switch is provided at a connection of the series branch to the common, a switch is provided at a connection of the first branch to the series branch, and a switch is provided at a connection of the second branch to the series branch, the method further comprising:
a switch arranged at the connecting end of the serial branch and the common end controls the serial branch to be in a disconnected state or a connected state;
a switch arranged at the connecting end of the first branch and the series branch controls the first branch to be in a disconnected state or a connected state;
and a switch arranged at the connecting end of the second branch and the series branch controls the second branch to be in a disconnected state or a connected state.
12. The method of claim 11, wherein the radio frequency switching circuit further comprises: a control circuit; the method further comprises the following steps:
the control circuit sends a first control signal to the switch branches to control the switches corresponding to the series branches to be opened, the switches corresponding to the first branches to be closed and the switches corresponding to the second branches to be closed; or sending a first control signal to the switch branches to control the switch corresponding to the series branch to be closed, the switch corresponding to the first branch to be opened, and the switch corresponding to the second branch to be closed.
13. The method of claim 12, wherein the second branch comprises a variable capacitor and a second inductor in series; the method further comprises the following steps:
the control circuit sends a second control signal to adjust the capacitance value of the variable capacitor and/or the inductance value of the second inductor,
when the switch branch circuit is turned off, the variable capacitor and the second inductor of the second branch circuit filter leaked signals; when the switch branch circuit is conducted, the variable capacitor and the second inductor restrain harmonic waves of a frequency band corresponding to radio-frequency signals transmitted by the series branch circuit.
14. The method of claim 13, wherein the second inductance is implemented by a bond wire.
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| 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 |
| TWI803020B (en) * | 2021-10-20 | 2023-05-21 | 立積電子股份有限公司 | Radio-frequency switch |
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| CN106487394A (en) * | 2015-07-22 | 2017-03-08 | 天工方案公司 | Have and switch to reduce the transceiver of harmonic wave leakage |
| CN206294171U (en) * | 2016-11-29 | 2017-06-30 | 成都天奥测控技术有限公司 | A kind of ultrawide band high performance frequency expansion circuit |
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| JP3810011B2 (en) * | 2003-08-08 | 2006-08-16 | Ｔｄｋ株式会社 | High frequency switch module and multilayer substrate for high frequency switch module |
| CN101212230B (en) * | 2006-12-26 | 2012-07-11 | 中兴通讯股份有限公司 | Device and method for implementing DVB-H antenna matching network for mobile telephone |
| CN101286642A (en) * | 2007-12-19 | 2008-10-15 | 福建省电力试验研究院 | Reactive power compensation device of capacitor for 10kV bus in transforming plant with voltage gradation over 35kV |
| US8054135B2 (en) * | 2008-12-05 | 2011-11-08 | General Electric Company | Class-E amplifier and lighting ballast using the amplifier |
| CN106559048B (en) * | 2016-10-25 | 2020-08-14 | 锐迪科微电子（上海）有限公司 | Multimode radio frequency power amplifier |
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| CN103001484A (en) * | 2012-10-31 | 2013-03-27 | 上海交通大学 | Bridgeless power factor corrector of low-additional-voltage zero-voltage switch and modulating method |
| CN106487394A (en) * | 2015-07-22 | 2017-03-08 | 天工方案公司 | Have and switch to reduce the transceiver of harmonic wave leakage |
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