CN114095049A - Radio frequency transceiving switch circuit, radio frequency front-end circuit and radio frequency transceiver - Google Patents
Radio frequency transceiving switch circuit, radio frequency front-end circuit and radio frequency transceiver Download PDFInfo
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- CN114095049A CN114095049A CN202010716455.9A CN202010716455A CN114095049A CN 114095049 A CN114095049 A CN 114095049A CN 202010716455 A CN202010716455 A CN 202010716455A CN 114095049 A CN114095049 A CN 114095049A
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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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
- H04B1/68—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 for wholly or partially suppressing the carrier or one side band
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a radio frequency transceiving switch circuit, a radio frequency front-end circuit and a radio frequency transceiver, wherein the radio frequency transceiving switch circuit is characterized in that a first switch and a second switch for realizing radio frequency transceiving switching are respectively arranged between corresponding points in serial and parallel branches and the ground, the radio frequency transceiving switching can be realized through on-off control of the two switches, a matching network required by the radio frequency front-end circuit is formed at the same time, and the radio frequency transceiving switch circuit is strong in universality and high in integration level; the two switches are not positioned in the signal path, so that the problems of insertion loss and deterioration of the transceiving performance caused by the fact that the radio frequency transceiving switch is arranged in the signal path of the antenna can be avoided while the time-sharing high-performance work of the radio frequency transceiving is realized; in addition, the capacitor is connected in parallel to the inductor of the transmitting matching unit, and high-order harmonic suppression of the transmitting carrier can be achieved.
Description
Technical Field
The invention relates to the field of communication electronic integrated circuits, in particular to a radio frequency transceiving switch circuit, a radio frequency front-end circuit and a radio frequency transceiver.
Background
In a wireless communication device that transmits and receives data in a time-division manner, only one antenna is generally provided. The rf front-end circuit in the device necessarily includes an rf transmit-receive switch circuit that switches between the receive path and the transmit path.
As shown in fig. 1, the conventional rf transceiver switch circuit mainly uses MOS transistors (M1, M2, M3, and M4 in fig. 1) to form a single-pole double-throw switch circuit, and is controlled by control signals Vc and Vc', so that an antenna is connected to an input port Rx of a receiving path or an output port Tx of a transmitting path through an ANT port. Because the radio frequency transceiving switch circuit is additionally arranged in a signal path of the antenna, insertion loss is caused, and transceiving performance is deteriorated.
Disclosure of Invention
In view of the above, the present application provides a radio frequency transceiver switch circuit, a radio frequency front end circuit, and a radio frequency transceiver, so as to solve the problems of insertion loss and degradation of the transceiver performance caused by installing a radio frequency transceiver switch in a signal path of an antenna in the conventional radio frequency transceiver switch circuit.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the application discloses in a first aspect, a radio frequency transceiver switch circuit, including: the circuit comprises a series-parallel branch circuit, a first switch and a second switch; wherein:
the series-parallel branch is respectively connected with the input port of the receiving path, the output port of the transmitting path and the antenna;
the first switch and the second switch are respectively arranged between the corresponding point in the series-parallel branch and the ground;
when the first switch is opened and the second switch is closed, the output port of the transmitting path is short-circuited to the ground; the part of the serial-parallel branch between the input port of the receiving path and the antenna is a corresponding matching network;
when the first switch is closed and the second switch is opened, the input port of the receiving path is short-circuited to the ground; the part of the series-parallel branch between the output port of the transmission path and the antenna at least comprises: the device comprises a transmitting matching unit or N transmitting matching units which are sequentially connected in series, wherein N is a positive integer larger than 1;
the transmission matching unit includes: two capacitors and an inductor; the inductor is connected with one capacitor in parallel, one end of the inductor in parallel is grounded through the other capacitor, and the inductor is used as the output end of the transmitting matching unit and is used for being connected with the antenna or the input end of the latter transmitting matching unit; the other end of the parallel connection is used as the input end of the emission matching unit and is used for connecting the output end of the previous emission matching unit or the output port of the emission path;
the second switch is arranged between any one point on the serial branch of the N emission matching units and the ground.
Optionally, in the radio frequency transceiving switch circuit, when the first switch is turned off and the second switch is turned off, a portion of the serial-parallel branch between the input port of the receiving path and the antenna is in an equivalent form of a pi-type matching network or an equivalent or simplified form of a T-type matching network;
when the first switch is closed and the second switch is opened, the part of the series-parallel branch between the output port of the transmitting path and the antenna is a second-order LC impedance matching network or an equivalent or simplified form of the second-order LC impedance matching network.
Optionally, in the above radio frequency transceiving switching circuit, N is 2, and the series-parallel branch includes: the circuit comprises a first capacitor, a second capacitor, a first inductor, a third capacitor, a fourth capacitor, a second inductor and a third inductor;
one end of the first capacitor is connected with one end of the first inductor and one end of the third capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the second inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the second inductor and the other end of the first switch are both grounded;
the other end of the first inductor is respectively connected with the other end of the third capacitor, one end of the third inductor, one end of the second capacitor, one end of the fourth capacitor and the first end of the second switch;
the other end of the third inductor is connected with the other end of the fourth capacitor and an output port of the transmitting path respectively;
the other end of the second capacitor and the second end of the second switch are both grounded.
Optionally, in the above radio frequency transceiving switching circuit, N is 1, and the series-parallel branch includes: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor and a second inductor;
one end of the first capacitor is connected with one end of the first inductor and one end of the third capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the second inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the second inductor and the second end of the first switch are both grounded;
the other end of the first inductor is respectively connected with the other end of the third capacitor, one end of the second capacitor, the first end of the second switch and the output port of the transmitting path;
the other end of the second capacitor and the second end of the second switch are both grounded.
Optionally, in the above radio frequency transceiving switching circuit, N is 2, and the series-parallel branch includes: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the first inductor, the second inductor and the third inductor;
one end of the first capacitor is connected with one end of the second capacitor, one end of the second inductor and one end of the fifth capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, the first end of the first switch and one end of the third capacitor;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the first inductor and the second end of the first switch are both grounded;
the other end of the second inductor is connected with the other end of the fifth capacitor, one end of the fourth capacitor, the first end of the second switch, one end of the sixth capacitor and one end of the third inductor respectively;
the other end of the third inductor is connected with the other end of the sixth capacitor and the output port of the transmitting path respectively;
the other end of the second capacitor, the other end of the fourth capacitor and the second end of the second switch are all grounded.
Optionally, in the above radio frequency transceiving switching circuit, N is 1, and the series-parallel branch includes: the first capacitor, the second capacitor, the fifth capacitor, the first inductor and the second inductor;
one end of the first capacitor is connected with one end of the second capacitor, one end of the fifth capacitor and one end of the second inductor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the first inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the first inductor and the second end of the first switch are both grounded;
the other end of the second inductor is connected with the other end of the fifth capacitor, the first end of the second switch and the output port of the transmitting path respectively;
the other end of the second capacitor and the second end of the second switch are both grounded.
Optionally, in the radio frequency transceiver switch circuit, the first switch and the second switch are both electronic switches.
A second aspect of the present application discloses a radio frequency front end circuit, including: a receive path, a transmit path, and a radio frequency transmit receive switch circuit as disclosed in any of the above first aspects.
A third aspect of the present application discloses a radio frequency transceiver comprising: an antenna and at least one radio frequency front-end circuit as disclosed in the second aspect.
According to the radio frequency transceiving switch circuit, the first switch and the second switch for realizing radio frequency transceiving switching are respectively arranged between the corresponding point in the serial-parallel branch and the ground, the radio frequency transceiving switching can be realized through on-off control of the two switches, and meanwhile, a matching network required by a radio frequency front-end circuit is formed, so that the radio frequency transceiving switch circuit is high in universality and integration level; the two switches are not positioned in the signal path, so that the problems of insertion loss and deterioration of the transceiving performance caused by the fact that the radio frequency transceiving switch is arranged in the signal path of the antenna can be avoided while the time-sharing high-performance work of the radio frequency transceiving is realized; in addition, the capacitor is connected in parallel to the inductor of the transmitting matching unit, and high-order harmonic suppression of the transmitting carrier can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a conventional rf transceiver switch circuit;
fig. 2 is a schematic structural diagram of an rf transceiver switch circuit according to an embodiment of the present disclosure;
fig. 3a is a schematic structural diagram of a first switch provided in the present application;
fig. 3b is a schematic structural diagram of a second switch provided in the present application;
fig. 4 to fig. 7 are schematic circuit structures of four rf transceiver switch circuits according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a radio frequency transceiver according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a radio frequency transceiving switch circuit, which aims to solve the problems of insertion loss and poor transceiving performance caused by the fact that a radio frequency transceiving switch is additionally arranged in a signal path of an antenna in the conventional radio frequency transceiving switch circuit.
Referring to fig. 2, the rf transceiver switch circuit mainly includes: a series-parallel branch 101, a first switch S1, and a second switch S2.
The serial-parallel branch 101 is connected to the input port Rx of the receiving path, the output port Tx of the transmitting path, and the antenna, respectively. The port ANT in fig. 2 is a port connected to an antenna.
The first switch S1 and the second switch S2 are respectively disposed between the corresponding point in the serial-parallel branch 101 and ground. For the specific implementation devices of the first switch S1 and the second switch S2, both electronic switches, such as MOS transistors (as shown in fig. 3a and 3 b), may be used, but other types of switching tubes are also possible. The specific types of the first switch S1 and the second switch S2 are not limited in this application and fall within the scope of the present application.
If the specific structure of the first switch S1 is as shown in fig. 3a, the drain Ts1 of the first switch S1 is the first end of the first switch S1, the source of the first switch S1 is the second end of the first switch S1 and is grounded, and the gate of the first switch S1 receives the control signal Vc through a resistor. If the specific structure of the second switch S2 is as shown in fig. 3b, the drain Ts2 of the second switch S2 is the first end of the second switch S2, the source of the second switch S2 is the second end of the second switch S2 and is grounded, and the gate of the second switch S2 receives the control signal Vc' through a resistor.
In practical applications, the series-parallel branch 101 may also be formed by a receiving matching module and a transmitting matching module. Specifically, when the first switch S1 and the second switch S2 are both turned off, the portion of the series-parallel branch 101 between the output port Tx of the transmission path and the antenna is a receiving matching module (as shown in the upper half of fig. 2), and the portion of the series-parallel branch 101 between the output port Tx of the transmission path and the antenna is a transmitting matching module (not shown). When the first switch S1 is opened and the second switch S2 is closed, the output port TX of the transmit path is shorted to ground by the second switch S2, and the portion of the serial-parallel branch 101 between the input port RX of the receive path and the antenna ANT, that is, the topology formed by the transmit matching module, the second switch S2 and the receive matching module, is a corresponding matching network. When the first switch S1 is closed and the second switch S2 is turned off, the output port TX of the transmit path is shorted to ground by the second switch S2, and the portion of the serial-parallel branch between the output port TX of the transmit path and the antenna ANT, that is, the topology formed by the first switch S1 and the transmit matching module together in the receive matching module at least includes: one transmission matching unit 102, or N transmission matching units 102 connected in series in sequence, where N is a positive integer.
It should be noted that the specific value of N may be determined according to the actual application situation and the user requirement, and the present application is not particularly limited, and any value of N belongs to the protection scope of the present application.
In practical applications, as shown in fig. 2, the transmission matching unit 102 includes: two capacitors and an inductor; the inductor is connected in parallel with one capacitor, and one end of the parallel connection is grounded through the other capacitor and is used as the output end of the transmission matching unit 102 and used for connecting an antenna or the input end of the next transmission matching unit 102; the other end of the parallel connection is used as an input end of the transmission matching unit 102, an output end for connecting the previous transmission matching unit 102 or an output port TX of the transmission path. Two transmit matching units 102 are shown in fig. 2: in the former transmission matching unit 102, an inductor Ln and a capacitor Cn' are connected in parallel between an input end and an output end thereof, and the output end thereof is grounded through the capacitor Cn; in the latter transmission matching unit 102, an inductor L1 and a capacitor C1' are connected in parallel between the input terminal and the output terminal thereof, and the output terminal thereof is grounded through a capacitor C1. Through the parallel connection of the inductor and the capacitor in the N transmitting matching units 102, the N-order harmonic suppression can be realized, and the harmonic output by the carrier wave can be suppressed.
The first switch S1 is disposed between any one point in the receiving matching module and ground; the second switch S2 is disposed between any one of the points on the series branch of the N transmit matching units 102 and ground. At this time, if the first switch S1 is opened and the second switch S2 is closed, the output port TX of the transmission path is directly shorted to the ground by the second switch S2, or the output port TX of the transmission path is shorted to the ground by the second switch S2 through the transmission matching unit 102 between the output port TX of the transmission path and the second switch S2; and the part of the series-parallel branch 101 between the input port RX of the receiving path and the antenna ANT, that is, the topology formed by the transmitting matching unit 102, the second switch S2 and the receiving matching module from the antenna ANT to the second switch S2, is a corresponding matching network. If the first switch S1 is closed and the second switch S2 is open, the input port RX of the receive path is shorted to ground directly by the first switch S1, or after passing through a portion of the device between the input port RX of the receive path and the first switch S1 in the receive matching module by the first switch S1; the topology formed by the part of the series-parallel branch between the output port TX of the transmit path and the antenna ANT, that is, the part of the device between the antenna ANT and the first switch S1 in the receive matching module, the first switch S1 and the transmit matching module, at least includes: one transmission matching unit 102, or N transmission matching units 102 connected in series in sequence, where N is a positive integer, and fig. 2 only takes two transmission matching units 102 as an example.
It should be noted that, in practical applications, the series-parallel branch 101 includes at least two inductors and at least one capacitor. For simplicity, the following description will be given by taking N as 1 or 2:
when the first switch S1 is turned off and the second switch S2 is turned on, the part of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is in an equivalent form of a pi-type matching network or an equivalent or simplified form of a T-type matching network; the output port Tx of the transmit path is shorted to ground; and further, the radio frequency receiving work can be realized. At this time, no matter how large the impedance is when the Low Noise Amplifier (LNA) connected to the input port Rx of the reception path is turned off, the impedance matching between the antenna and the output port Tx of the transmission path can be flexibly adjusted by the equivalent form of the pi-type matching network or the equivalent or simplified form of the T-type matching network.
When the first switch S1 is closed and the second switch S2 is open, the part of the series-parallel branch 101 between the output port Tx of the transmission path and the antenna is a second-order LC impedance matching network or an equivalent or simplified form of the second-order LC impedance matching network; the input port Rx of the receive path is shorted to ground; and further, the radio frequency transmission work can be realized. At this time, no matter how large the impedance is when the Power Amplifier (PA) connected to the output port Tx of the transmission path is turned off, the change of the output impedance between the antenna and the output port Tx of the transmission path can be realized by the second-order LC impedance matching network or an equivalent or simplified form of the second-order LC impedance matching network between the antenna and the input port Rx of the reception path.
As can be seen from the above, in the rf transceiving switch circuit provided in the present application, since the first switch S1 and the second switch S2 are respectively disposed between the corresponding point in the serial-parallel branch 101 and the ground, and are not connected in series in the signal path of the rf transceiving, the switch can be prevented from affecting the rf performance.
And, because in the radio frequency receiving operation, the output port Tx of the transmission path is short-circuited to the ground; when the radio frequency transmission works, the input port Rx of the receiving path is short-circuited to the ground; that is, the rf transceiving switch circuit provided in the present application has no requirement for the turn-off impedance of the output port Tx of the transmit path and the input port Rx of the receive path, and has wide applicability.
It should be noted that, in the prior art, there is also a radio frequency transmit-receive switch circuit, which utilizes a matching circuit of LNA and PA, and switches the transmit-receive state in cooperation with a switch, so as to avoid using a switch formed by MOS transistors on the transmit-receive path, and further avoid additional insertion loss. However, when switching, the LNA or PA needs to be turned off to satisfy a given condition, otherwise the performance of the rf transmit-receive switch circuit is deteriorated. The radio frequency transceiving switch circuit provided by the application has no requirement on the impedance output when the LNA or PA is switched off, can ensure the transceiving performance of the radio frequency transceiving switch circuit, and has better universality. In addition, the matching circuit of the LNA in the existing radio frequency transceiving switch circuit only adopts a single inductor, so that the degree of freedom is limited, and the wide application is not facilitated. In the radio frequency transceiving switch circuit provided by the application, the matching circuit is at least equivalent to a pi-type matching network or equivalent or simplified form of a T-type matching network, and the radio frequency transceiving switch circuit has better degree of freedom and universality. Therefore, the problems that the matching circuit only adopts a single inductor, the freedom degree is limited and the wide application is not facilitated can be avoided.
On the basis of the above embodiment, the following specific forms are given for the specific structure of the series-parallel branch 101 and the connection relationship between the series-parallel branch and the two switches according to another embodiment of the present application:
optionally, referring to fig. 4, in practical application, if N is 2, the serial-parallel branch 101 in the radio frequency transceiving switch circuit may specifically include: the inductor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2 and a third inductor L3.
One end of the first capacitor C1 is connected to one end of the first inductor L1 and one end of the third capacitor C3, respectively, and the connection point is connected to the antenna. The port ANT in fig. 4 is a port connected to an antenna.
The other end of the first capacitor C1 is connected to one end of the second inductor L2, and the connection points are respectively connected to the first end of the first switch S1 and the input port Rx of the receiving path.
The other end of the second inductor L2 and the other end of the first switch S1 are both grounded.
The other end of the first inductor L1 is connected to the other end of the third capacitor C3, one end of the third inductor L3, one end of the second capacitor C2, one end of the fourth capacitor C4, and the first end of the second switch S2, respectively.
Specifically, a common connection point of the first inductor L1, the second switch S2, the second capacitor C2, and the third inductor L3 is an X point in the drawing.
The other end of the third inductor L3 is connected to the other end of the fourth capacitor C4 and the output port Tx of the transmit path, respectively.
The other terminal of the second capacitor C2 and the second terminal of the second switch S2 are both grounded.
It should be noted that the second capacitor C2, the third inductor L3 and the fourth capacitor C4 in fig. 4 form a transmitting matching unit; when the first switch S1 is closed, the first inductor L1, the third capacitor C3 and the first capacitor C1 form another transmitting matching unit.
In the practical application process:
when the radio frequency transceiving switch circuit is in a radio frequency receiving working state, the second switch S2 is closed, the first switch S1 is opened, and the point X is short-circuited to the ground. Therefore, no matter how large the impedance is when the PA connected to the output port Tx of the transmission path is turned off, the antenna and the input port Rx of the reception path form an equivalent pi-type matching network, that is, the part of the serial-parallel branch 101 between the input port Rx of the reception path and the antenna is an equivalent pi-type matching network, so that the impedance matching between the antenna and the input port Rx of the reception path can be flexibly adjusted.
When the rf transceiving switch circuit is in the rf transmitting operation state, the first switch S1 is closed, the second switch S2 is opened, and the input port Rx of the receiving path is shorted to the ground. Similarly, the turn-off impedance of the LNA connected to the input port Rx of the receiving path does not need to be considered, the antenna and the output port Tx of the transmitting path form an equivalent LC impedance matching network, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmitting path and the antenna is in an equivalent form of a second-order LC impedance matching network, and the impedance conversion from the antenna to the output port Tx of the transmitting path can be realized.
Since the inductors in the transmission matching unit between the antenna and the output port Tx of the transmission path are all connected in parallel with capacitors, such as the third capacitor C3 connected in parallel with the first inductor L1 and the fourth capacitor C4 connected in parallel with the third inductor L3 in the figure, the harmonics of the carrier output can be further suppressed, and at the same time, additional harmonic suppression can be provided with almost no increase in cost, so that the spectrum emission requirement of FCC (Federal Communications Commission, united states Federal Communications Commission) can be satisfied by omitting the off-chip filter element.
Based on FIG. 4, the carrier frequency f transmitted by the RF transceiver switch circuit0The description is given for the sake of example. After the capacitor C3 and the inductor L1 are connected in parallel, resonance can be guaranteed at nth harmonic n x f0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided. Similarly, after the capacitor C4 and the inductor L3 are connected in parallel, resonance can be ensured at nth harmonic n x f0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided. In practical application, the specific value of n can be automatically selected according to user requirements and application environments, and the method belongs to the protection range of the application no matter what value n is selected.
Optionally, referring to fig. 5, in practical application, if N is 2, the serial-parallel branch 101 in the radio frequency transceiving switch circuit may further specifically include: the inductor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1, a second inductor L2 and a third inductor L3.
One end of the first capacitor C1 is connected to one end of the second capacitor C2, one end of the second inductor L2, and one end of the fifth capacitor C5, respectively, and the connection point is connected to the antenna. The port ANT in fig. 5 is a port connected to an antenna.
The other end of the first capacitor C1 is connected to one end of the first inductor L1, and the connection points are respectively connected to the first end of the first switch S1 and one end of the third capacitor C3.
Specifically, the common connection point of the first capacitor C1, the first inductor L1, the first switch S1 and the third capacitor C3 is the point Y in the figure.
The other terminal of the third capacitor C3 is connected to the input port Rx of the receive path.
The other end of the first inductor L1 and the second end of the first switch S1 are both grounded.
The other end of the second inductor L2 is connected to the other end of the fifth capacitor C5, one end of the fourth capacitor C4, the first end of the second switch S2, one end of the sixth capacitor C6, and one end of the third inductor L3, respectively.
Specifically, a common connection point of the second inductor L2, the fourth capacitor C4, the second switch S2, and the third inductor L3 is an X point in the drawing.
The other end of the third inductor L3 is connected to the other end of the sixth capacitor C6 and the output port Tx of the transmission path, respectively.
The other end of the second capacitor C2, the other end of the fourth capacitor C4 and the second end of the second switch S2 are all grounded.
It should be noted that the third inductor L3, the sixth capacitor C6, and the fourth capacitor C4 in fig. 5 form a transmitting matching unit. When the first switch S1 is closed, the first capacitor C1 and the second capacitor C2 in fig. 5 are connected in parallel to form another emission matching unit with the second inductor L2 and the fifth capacitor C5.
In practical applications, the operation of the series-parallel branch 101 in the rf transceiving switch circuit shown in fig. 5 is as follows:
when the rf transceiving switch circuit is in the rf receiving operation state, the second switch S2 is closed, the first switch S1 is opened, and the output port Tx of the transmit path is shorted to the ground. In this way, no matter how large the impedance is when the PA connected to the output port Tx of the transmission path is turned off, the antenna and the input port Rx of the reception path form an equivalent T-type matching network, that is, the part of the serial-parallel branch 101 between the input port Rx of the reception path and the antenna is the equivalent T-type matching network, so that the input impedance matching between the antenna and the LNA connected to the output port Tx of the transmission path can be flexibly adjusted.
When the radio frequency transceiving switch circuit is in a radio frequency transmitting working state, the first switch S1 is closed, the second switch S2 is opened, and the Y point is short-circuited to the ground. Similarly, impedance when the LNA connected to the input port Rx of the receiving path is turned off does not need to be considered, and at this time, the antenna and the output port Tx of the transmitting path form an equivalent LC impedance matching network, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmitting path and the antenna is in an equivalent form of a second-order LC impedance matching network, so that impedance conversion from the antenna to the output port Tx of the transmitting path can be realized.
Due to the present embodiment, the inductors in the transmitting matching unit between the antenna and the output port Tx of the transmitting path are all connected in parallel with capacitors, such as the fifth capacitor C5 connected in parallel with the second inductor L2 and the sixth capacitor C6 connected in parallel with the third inductor L3 in the figure, so that the harmonics of the carrier output can be further suppressed, and at the same time, additional harmonic suppression can be provided with almost no increase in cost, thereby omitting the off-chip filter element and meeting the FCC spectrum transmitting requirement.
Based on FIG. 5, the carrier frequency f transmitted by the RF transceiver switch circuit0The description is given for the sake of example. After the capacitor C5 and the inductor L2 are connected in parallel, resonance can be guaranteed at nth harmonic n x f0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided. Similarly, after the capacitor C6 and the inductor L3 are connected in parallel, resonance can be ensured at nth harmonic n x f0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided. In practical applicationThe specific value of n can be automatically selected according to the user requirement and the application environment, and the method belongs to the protection range of the application no matter what value n is selected.
Optionally, referring to fig. 6, in practical application, if N is equal to 1, the serial-parallel branch 101 in the radio frequency transceiving switch circuit specifically includes: the inductor comprises a first capacitor C1, a second capacitor C2, a fifth capacitor C5, a first inductor L1 and a second inductor L2.
One end of the first capacitor C1 is connected to one end of the second capacitor C2, one end of the fifth capacitor C5, and one end of the second inductor L2, respectively, and the connection point is connected to the antenna.
The other end of the first capacitor C1 is connected to one end of the first inductor L1, and the connection points are respectively connected to the first end of the first switch S1 and the input port Rx of the receiving path. The port ANT in fig. 6 is a port connected to an antenna.
The other end of the first inductor L1 and the second end of the first switch S1 are both grounded.
The other end of the second inductor L2 is connected to the other end of the fifth capacitor C5, the first end of the second switch S2, and the output port Tx of the transmit path.
The other terminal of the second capacitor C2 and the second terminal of the second switch S2 are both grounded.
It should be noted that, in order to make the integration degree of the rf transceiving switch circuit higher, the rf transceiving switch circuit provided in this embodiment reduces one inductor and three capacitors (the third inductor L3, the third capacitor C3, the fourth capacitor C4, and the sixth capacitor C6 in fig. 5) based on the rf transceiving switch circuit provided in the corresponding embodiment in fig. 5. Therefore, not only can components be saved, but also the layout area is reduced, the manufacturing cost is reduced and the integration level of the radio frequency transceiving switch circuit is improved when the radio frequency transceiving switch circuit is integrated on a chip.
It should be noted that, after the first switch S1 is closed, the first capacitor C1 is connected in parallel with the second capacitor C2, and then forms a transmitting matching unit with the second inductor L2 and the fifth capacitor C5.
In practical applications, the operation of the series-parallel branch 101 in the rf transceiving switch circuit shown in fig. 6 is as follows:
when the rf transceiving switch circuit is in the rf receiving operation state, the second switch S2 is closed, the first switch S1 is opened, and the output port Tx of the transmit path is shorted to the ground. The antenna and the input port Rx of the receiving path form an equivalent LC-type matching network, that is, the part of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is a simplified equivalent LC impedance matching network of the pi-type matching network.
When the rf transceiving switch circuit is in the rf transmitting operation state, the first switch S1 is closed, the second switch S2 is opened, and the input port Rx of the receiving path is shorted to the ground. At this time, the antenna and the output port Tx of the transmission path form an equivalent LC impedance matching network, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmission path and the antenna is a simplified equivalent LC impedance matching network of a second-order LC impedance matching network, so that the impedance transformation from the antenna to the output port Tx of the transmission path can be realized.
Due to this embodiment, the inductances in the transmission matching unit between the antenna and the output port Tx of the transmission path are all connected in parallel with a capacitance, such as the fifth capacitance C5 connected in parallel with the second inductance L2 in the figure, so that the harmonics of the carrier output can be further suppressed. Meanwhile, under the condition of hardly increasing the cost, additional harmonic suppression can be provided, so that the spectrum emission requirement of FCC can be met by omitting an off-chip filtering element.
Based on FIG. 6, the carrier frequency f transmitted by the RF transceiver switch circuit0The description is given for the sake of example. After the capacitor C5 and the inductor L2 are connected in parallel, resonance can be guaranteed at nth harmonic n x f0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided.
Optionally, referring to fig. 7, in practical application, N is 1, and the serial-parallel branch 101 in the radio frequency transceiving switch circuit specifically includes: the inductor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1 and a second inductor L2.
One end of the first capacitor C1 is connected to one end of the first inductor L1 and one end of the third capacitor C3, respectively, and the connection point is connected to the antenna. The port ANT in fig. 7 is a port connected to an antenna.
The other end of the first capacitor C1 is connected to one end of the second inductor L2, and the connection points are respectively connected to the first end of the first switch S1 and the input port Rx of the receiving path.
The other end of the second inductor L2 and the second end of the first switch S1 are both grounded.
The other end of the first inductor L1 is connected to the other end of the third capacitor C3, one end of the second capacitor C2, a first end of the second switch S2, and the output port Tx of the transmit path.
Specifically, the common connection point of the first inductor L1, the second capacitor C2 and the second switch S2 is point X in the figure.
The other terminal of the second capacitor C2 and the second terminal of the second switch S2 are both grounded.
It should be noted that, in order to make the integration level of the radio frequency transceiving switch circuit higher, the radio frequency transceiving switch circuit provided in this embodiment reduces an inductor and a capacitor (the third inductor L3 and the fourth capacitor C4 in fig. 4) on the basis of the radio frequency transceiving switch circuit provided in the embodiment corresponding to fig. 4, which not only can save components, but also can reduce the layout area and improve the integration level of the radio frequency transceiving switch circuit when the radio frequency transceiving switch circuit is integrated on a chip.
It should be noted that, when the first switch S1 is closed, the first capacitor C1, the first inductor L1 and the third capacitor C3 form a transmitting matching unit, and the second capacitor C2 is used as a device other than the transmitting matching unit in the matching network between the output port Tx of the transmitting path and the antenna in the serial-parallel branch 101.
In practical applications, the operation of the series-parallel branch 101 in the rf transceiving switch circuit shown in fig. 7 is as follows:
when the rf transceiving switch circuit is in the rf receiving operation state, the second switch S2 is closed, the first switch S1 is opened, and the output port Tx of the transmit path is shorted to the ground. Therefore, no matter how large the impedance is when the PA connected to the output port Tx of the transmit path is turned off, the antenna and the input port Rx of the receive path form an equivalent pi-type matching network, that is, the part of the serial-parallel branch 101 between the input port Rx of the receive path and the antenna is an equivalent pi-type matching network, so that the impedance matching from the antenna to the input of the LNA can be flexibly adjusted.
When the rf transceiving switch circuit is in the rf transmitting operation state, the first switch S1 is closed, the second switch S2 is opened, and the input port Rx of the receiving path is shorted to the ground. Therefore, the antenna and the output port Tx of the transmission path form an equivalent pi-type impedance matching network, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmission path and the antenna is a simplified equivalent pi-type matching network of a second-order LC impedance matching network, so that the impedance transformation and filtering of the output from the antenna to the output port Tx of the transmission path can be realized.
Due to this embodiment, the inductances in the transmit matching unit between the antenna and the output port Tx of the transmit path are all connected in parallel with a capacitor, such as the third capacitor C3 connected in parallel with the first inductance L1, so that resonance at the nth harmonic n × f can be ensured0At frequencies (n-2, 3, …), a multi-stage suppression of the nth order harmonics is provided, further reducing the requirements on the off-chip filter element.
Optionally, an embodiment of the present application further provides a radio frequency front-end circuit, please refer to fig. 8, where the front-end circuit mainly includes: a receive path 201, a transmit path 203, and an rf transmit receive switch circuit 202 as provided in any of the embodiments described above.
The receiving path 201 includes an LNA therein, and the LNA is mainly used for amplifying a radio frequency signal of a receiving channel.
The transmit path 203 includes a PA therein, which is mainly used to achieve radio frequency signal amplification of the transmit channel.
It should be noted that the rf front-end circuit is a core component of a mobile communication system, and mainly plays a role of transceiving an rf signal, and generally comprises four parts, i.e., a PA, an rf switch, a filter, and an LNA.
The radio frequency switch is mainly used for realizing the switching of receiving and transmitting of radio frequency signals and the switching among different frequency bands. The filter is mainly used for reserving signals in a specific frequency band and filtering signals outside the specific frequency band.
In practical application, a duplexer may be added to the rf front-end circuit to isolate the transmitted and received signals.
It should be further noted that, besides the above-described devices, the radio frequency front-end circuit may also be provided with other devices, and the setting conditions of each device in the radio frequency front-end circuit may refer to the prior art, which is not described herein again, and all of which belong to the protection scope of the present application.
In this embodiment, after the rf front-end circuit is provided with the rf transceiving switch circuit 202, since the rf transceiving switch circuit 202 has the characteristics of strong versatility, high integration level, good transceiving performance, reliable and stable operation, and the like, the rf front-end circuit provided with the rf transceiving switch circuit 202 can further improve the operation stability of the rf front-end circuit, in addition to ensuring that the receiving path 201 and the transmitting path 203 switch each other to connect the antennas.
Optionally, an embodiment of the present application further provides a radio frequency transceiver, please refer to fig. 9, where the radio frequency transceiver mainly includes: an antenna 301, a baseband circuit 303 and at least one rf front-end circuit 302 as described in the above embodiments (fig. 9 only shows the case where the number of the transmitting front-end circuits 203 is 1).
In practical application, the antenna 301 and the rf front-end circuit 302 cooperate with each other, so that the rf transceiver realizes an rf transceiving function; the baseband circuit is used for processing frequency signals captured by the antenna.
It should be noted that, for a related description of the rf front-end circuit 302, reference may be made to the embodiment corresponding to fig. 8, and details are not described herein again.
It should be further noted that, for the related description of the radio frequency transceiver, reference may also be made to the prior art, and the description of the present application is not repeated herein, and all of the description and the claims of the present application belong to the scope of the present application.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A radio frequency transmit-receive switch circuit, comprising: the circuit comprises a series-parallel branch circuit, a first switch and a second switch; wherein:
the series-parallel branch is respectively connected with the input port of the receiving path, the output port of the transmitting path and the antenna;
the first switch and the second switch are respectively arranged between the corresponding point in the series-parallel branch and the ground;
when the first switch is opened and the second switch is closed, the output port of the transmitting path is short-circuited to the ground; the part of the serial-parallel branch between the input port of the receiving path and the antenna is a corresponding matching network;
when the first switch is closed and the second switch is opened, the input port of the receiving path is short-circuited to the ground; the part of the series-parallel branch between the output port of the transmission path and the antenna at least comprises: the device comprises a transmitting matching unit or N transmitting matching units which are sequentially connected in series, wherein N is a positive integer larger than 1;
the transmission matching unit includes: two capacitors and an inductor; the inductor is connected with one capacitor in parallel, one end of the inductor in parallel is grounded through the other capacitor, and the inductor is used as the output end of the transmitting matching unit and is used for being connected with the antenna or the input end of the latter transmitting matching unit; the other end of the parallel connection is used as the input end of the emission matching unit and is used for connecting the output end of the previous emission matching unit or the output port of the emission path;
the second switch is arranged between any one point on the serial branch of the N emission matching units and the ground.
2. The rf transceiving switch circuit of claim 1, wherein when the first switch is turned off and the second switch is turned on, a portion of the serial-parallel branch between the input port of the receive path and the antenna is an equivalent form of a pi-type matching network or an equivalent or simplified form of a T-type matching network;
when the first switch is closed and the second switch is opened, the part of the series-parallel branch between the output port of the transmitting path and the antenna is a second-order LC impedance matching network or an equivalent or simplified form of the second-order LC impedance matching network.
3. The rf transmit-receive switch circuit according to claim 2, wherein N-2, the series-parallel branch comprises: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the first inductor, the second inductor and the third inductor;
one end of the first capacitor is connected with one end of the first inductor and one end of the third capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the second inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the second inductor and the other end of the first switch are both grounded;
the other end of the first inductor is respectively connected with the other end of the third capacitor, one end of the third inductor, one end of the second capacitor, one end of the fourth capacitor and the first end of the second switch;
the other end of the third inductor is connected with the other end of the fourth capacitor and an output port of the transmitting path respectively;
the other end of the second capacitor and the second end of the second switch are both grounded.
4. The rf transmit-receive switch circuit according to claim 2, wherein N-1, the series-parallel branch comprises: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a first inductor and a second inductor;
one end of the first capacitor is connected with one end of the first inductor and one end of the third capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the second inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the second inductor and the second end of the first switch are both grounded;
the other end of the first inductor is respectively connected with the other end of the third capacitor, one end of the second capacitor, the first end of the second switch and the output port of the transmitting path;
the other end of the second capacitor and the second end of the second switch are both grounded.
5. The rf transmit-receive switch circuit according to claim 2, wherein N-2, the series-parallel branch comprises: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the first inductor, the second inductor and the third inductor;
one end of the first capacitor is connected with one end of the second capacitor, one end of the second inductor and one end of the fifth capacitor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, the first end of the first switch and one end of the third capacitor;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the first inductor and the second end of the first switch are both grounded;
the other end of the second inductor is connected with the other end of the fifth capacitor, one end of the fourth capacitor, the first end of the second switch, one end of the sixth capacitor and one end of the third inductor respectively;
the other end of the third inductor is connected with the other end of the sixth capacitor and the output port of the transmitting path respectively;
the other end of the second capacitor, the other end of the fourth capacitor and the second end of the second switch are all grounded.
6. The rf transmit-receive switch circuit according to claim 2, wherein N-1, the series-parallel branch comprises: the first capacitor, the second capacitor, the fifth capacitor, the first inductor and the second inductor;
one end of the first capacitor is connected with one end of the second capacitor, one end of the fifth capacitor and one end of the second inductor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with one end of the first inductor, and connection points are respectively connected with the first end of the first switch and the input port of the receiving path;
the other end of the first inductor and the second end of the first switch are both grounded;
the other end of the second inductor is connected with the other end of the fifth capacitor, the first end of the second switch and the output port of the transmitting path respectively;
the other end of the second capacitor and the second end of the second switch are both grounded.
7. The radio frequency transmit-receive switch circuit according to any of claims 1-6, wherein the first switch and the second switch are electronic switches.
8. A radio frequency front end circuit, comprising: a receive path, a transmit path, and a radio frequency transmit receive switch circuit as claimed in any one of claims 1 to 7.
9. A radio frequency transceiver, comprising: an antenna and at least one radio frequency front end circuit as claimed in claim 8.
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| CN202010716455.9A CN114095049B (en) | 2020-07-23 | 2020-07-23 | Radio frequency receiving and transmitting switch circuit, radio frequency front-end circuit and radio frequency transceiver |
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| CN115776304A (en) * | 2023-02-07 | 2023-03-10 | 唯捷创芯(天津)电子技术股份有限公司 | Low-loss radio frequency transceiving front-end module and electronic equipment |
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| CN114095049B (en) | 2023-05-23 |
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