CN113972925B - 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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- CN113972925B CN113972925B CN202010716486.4A CN202010716486A CN113972925B CN 113972925 B CN113972925 B CN 113972925B CN 202010716486 A CN202010716486 A CN 202010716486A CN 113972925 B CN113972925 B CN 113972925B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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Abstract
When a first switch is switched off and a second switch is switched off, the part of a serial-parallel branch between an input port of a receiving path and an antenna is a T-shaped matching network or the equivalent or simplified form of the T-shaped matching network, and an output port of a transmitting path is short-circuited to the ground; 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, and the input port of the receiving path is short-circuited to the ground; that is, the scheme is formed by fusing matching circuits of radio frequency receiving and radio frequency transmitting, can realize time-sharing high-performance work of radio frequency receiving and transmitting by matching with a switch in a non-signal path, and can avoid the problems of insertion loss and deterioration of receiving and transmitting performance caused by the fact that the radio frequency receiving and transmitting switch is arranged in a signal path of an antenna.
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 respectively 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 turned off and the second switch is turned on, the part of the serial-parallel branch between the input port of the receiving path and the antenna is a T-shaped matching network or an equivalent or simplified form of the T-shaped matching network; the output port of the transmit path is shorted to ground;
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; the input port of the receive path is shorted to ground.
Optionally, in the radio frequency transceiver switch circuit, the series-parallel branch includes at least two inductors and at least one capacitor.
Optionally, in the above radio frequency transceiver switching circuit, the series-parallel branch includes: 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 second capacitor and one end of the second inductor respectively, and the connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, one end of the third capacitor and the first end of the first switch;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with one end of the fourth capacitor, one end of the third inductor and the first end of the second switch;
the other end of the third inductor is connected with an output port of the transmitting path;
the other end of the fourth capacitor and the second end of the second switch are both grounded.
Optionally, in the above radio frequency transceiver switching circuit, the series-parallel branch includes: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor and a second inductor;
one end of the first capacitor is connected with one end of the second capacitor and one end of the second inductor respectively, and the connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, one end of the third capacitor and the first end of the first switch;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with one end of the fourth capacitor, the first end of the second switch and the output port of the transmitting path;
the other end of the fourth capacitor and the second end of the second switch are both grounded.
Optionally, in the radio frequency transceiving switching circuit, the series-parallel branch includes: the circuit comprises a first capacitor, a second capacitor, a first inductor and a second inductor;
one end of the first capacitor is connected with one end of the second capacitor and one end of the second inductor respectively, and the 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 second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with 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 radio frequency transceiver switch circuit, the number of the first switches is 2, and the series-parallel branch includes: the inductor comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor;
one end of the first capacitor is connected with one end of the first inductor, and the connecting point is connected with the antenna;
the other end of the first capacitor is connected with a first end of one first switch, and a second end of the first switch is grounded;
the other end of the first inductor is respectively connected with one end of the second inductor, one end of the second capacitor and one end of the third inductor;
the other end of the second capacitor is grounded;
the other end of the second inductor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is grounded.
Optionally, in the radio frequency transceiving switching circuit, the number of the first switches is 2, and the series-parallel branch includes: the first capacitor, 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 third inductor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with the first end of one first switch, and the second end of the first switch and the other end of the second capacitor are both grounded;
the other end of the second inductor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is grounded.
Optionally, in the radio frequency transceiver switch circuit, the number of the first switches is 2, and the series-parallel branch includes: the first capacitor, the second capacitor, the third capacitor, the first inductor and the third inductor;
one end of the first capacitor is connected with one end of the first inductor, and the connecting point is connected with the antenna;
the other end of the first capacitor is connected with a first end of one first switch, and a second end of the first switch is grounded;
the other end of the first inductor is respectively connected with one end of the second capacitor, one end of the third capacitor and one end of the third inductor;
the other end of the second capacitor is grounded;
the other end of the third capacitor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is 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 first aspects.
A third aspect of the present application discloses a radio frequency transceiver comprising: an antenna, baseband circuitry and at least one radio frequency front-end circuit as disclosed in the second aspect.
Based on the radio frequency transceiving switch circuit provided by the invention, the radio frequency transceiving switch circuit comprises: the circuit comprises a series-parallel branch circuit, a first switch and a second switch; 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 switched off and the second switch is switched off, the part of the series-parallel branch between the input port of the receiving path and the antenna is a T-shaped matching network or an equivalent or simplified form of the T-shaped matching network, and the output port of the transmitting path is short-circuited to the ground; 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, and the input port of the receiving path is short-circuited to the ground; that is, the radio frequency receiving and transmitting switch circuit is formed by fusing a matching circuit of radio frequency receiving and radio frequency transmitting, and can realize time-sharing high-performance work of radio frequency receiving and transmitting by matching with a switch in a non-signal path, and can avoid the problems of insertion loss and deterioration of receiving and transmitting performance caused by the fact that the radio frequency receiving and transmitting switch is arranged in a signal path of an antenna; moreover, the scheme can realize the impedance matching and the switch switching of the radio frequency receiving and the radio frequency transmitting at the same time, and the integration level is high.
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. 8 are schematic circuit structures of five radio frequency transmit-receive switch circuits according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present disclosure;
fig. 10 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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 deteriorated 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.
In practical applications, the series-parallel branch 101 includes at least two inductors and at least one capacitor. Such as the series-parallel branch 101 shown in fig. 2, 4, 5, 6, 7 and 8.
It should be noted that, the present application does not limit the specific number of the inductors and the capacitors in the parallel branch 101, and the specific values of the inductors and the capacitors in the series-parallel branch 101 are all within the protection scope of the present application.
The first switch S1 and the second switch S2 are respectively disposed between the corresponding point in the series-parallel branch 101 and ground. As for specific implementation devices of the first switch S1 and the second switch S2, both the first switch S1 and the second switch S2 may be electronic switches, such as MOS transistors (as shown in fig. 3a and fig. 3 b), and of course, other types of switching tubes may also be used.
If the specific structure of the first switch S1 is as shown in fig. 3a, the drain Ts1 of the first switch S1 is a first end of the first switch S1, the source of the first switch S1 is a second end of the first switch S1 and is grounded, and the gate of the first switch S1 receives the control signal Vc through the 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 the resistor.
In the practical application process:
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 a T-type matching network or an equivalent or simplified form of the T-type matching network; the output port Tx of the transmit path is shorted to ground; and further, radio frequency receiving 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 reception path is not affected; the impedance matching between the antenna and the input port Rx of the receiving path can be flexibly adjusted through a T-type matching network or an 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 serial-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 radio frequency transmission 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 receiving path is turned off, the transmitting path is not affected; impedance change between the antenna and the output port Tx of the transmission path may be achieved by a second-order LC impedance matching network or an equivalent or simplified form of a second-order LC impedance matching network.
As can be seen from the above, in the rf transceiving switch circuit provided in the present application, 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 serially connected in the signal path of the rf transceiving, so as to avoid the influence of the switches on the rf performance.
Moreover, when the radio frequency receiving works, the output port Tx of the transmitting 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.
In the conventional rf transmitting/receiving switching circuit shown in fig. 1, the switching tubes M1 and M2 need to be relatively large in order to reduce the insertion loss. At this time, the whole radio frequency transceiving switch circuit occupies a large layout area. In the radio frequency transceiving switch circuit provided by the application, the first switch S1 and the second switch S2 are respectively arranged between the corresponding point in the serial-parallel branch 101 and the ground, but are not connected in series in a signal path of radio frequency transceiving, so that insertion loss is not introduced, and the area of an occupied layout can be reduced.
However, there is a radio frequency transmit-receive switch circuit in the prior art, which utilizes the matching circuits of the LNA and the PA to cooperate with the switching action to realize the switching of the transmit-receive state; however, the matching circuit of the LNA only adopts a single inductor, and the degree of freedom is limited, which is not favorable for wide application. In the radio frequency transceiving switch circuit provided by the application, the matching circuit is at least a T-shaped matching network or an equivalent or simplified form of the T-shaped 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. In addition, when the switch of the rf transceiver switch circuit in the prior art is switched, the impedance of the LNA or the PA when the LNA or the PA is turned off is required, and a given condition needs to be met, otherwise, the performance of the rf transceiver switch circuit may be degraded greatly. The radio frequency transceiving switch circuit provided by the application has no requirement on the output impedance when the LNA or PA is switched off, and has better universality.
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. 2 as well, in practical application, 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 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 second capacitor C2 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, one end of the third capacitor C3, and the first end of the first switch S1, respectively.
Specifically, a common connection point of the first capacitor C1, the third capacitor C3, the first inductor L1 and the first switch S1 is a point Y in the figure.
The other end of the third capacitor C3 is connected to the input port Rx of the receive path.
The other end of the second capacitor C2, the other end of the first inductor L1 and the second end of the first switch S1 are all grounded.
The other end of the second inductor L2 is connected to one end of the fourth capacitor C4, one end of the third inductor L3, and the first end of the second switch S2, respectively.
Specifically, a common connection point of the second inductor L2, the fourth capacitor C4, the third inductor L3 and the second switch S2 is a point X in the figure.
The other end of the third inductor L3 is connected to the output port Tx of the transmit path.
The other end of the fourth capacitor C4 and the second end of the second switch S2 are both grounded.
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, the point X is short-circuited to the ground (namely, the output port Tx of the transmitting path is short-circuited to the ground), and the antenna is connected to the ground in parallel through L2 and C2. At this time, no matter how large the impedance is when the PA connected to the output port Tx of the transmission path is turned off, an equivalent C1-L1-C3T-type matching network is formed between the antenna and the input port Rx of the reception path, and the impedance matching of the input between the antenna and the input port Rx of the reception 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 input port Rx of the receiving path is short-circuited to the ground. Similarly, the impedance generated when the LNA connected to the input port Rx of the receiving path is turned off does not need to be considered, an equivalent C2-L2-C4-L3 second-order LC impedance matching network is formed between the antenna and the output port Tx of the transmitting path, so that the impedance transformation from the antenna to the output port Tx of the transmitting path is realized, and the second-order filtering can be performed on the signal output by the PA through the output port Tx of the transmitting path, so that the second-order and higher-order harmonics output by the PA through the output port Tx of the transmitting path are greatly suppressed, and the spectrum emission requirement of FCC (Federal Communications Commission) can be met without adding additional elements.
Optionally, referring to fig. 4, in practical application, the serial-parallel branch 101 in the radio frequency transceiving switch circuit specifically includes: the capacitor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, 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 and one end of the second inductor L2, respectively, and the connection point is connected to the antenna. The port ANT in fig. 4 is connected to an antenna.
The other end of the first capacitor C1 is connected to one end of the first inductor L1, one end of the third capacitor C3, and the first end of the first switch S1, respectively.
Specifically, a common end of the first capacitor C1, the first inductor L1, the first switch S1, and the third capacitor C3 is a point Y in the figure.
The other end of the third capacitor C3 is connected to the input port Rx of the receive path.
The other end of the second capacitor C2, the other end of the first inductor L1 and the second end of the first switch S1 are all grounded.
The other end of the second inductor L2 is connected to one end of the fourth capacitor C4, the first end of the second switch S2, and the output port Tx of the transmit path, respectively.
The other end of the fourth capacitor C4 and the second end 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, on the basis of the radio frequency transceiving switch circuit provided in the embodiment corresponding to fig. 2, one inductor (the third inductor L3 in fig. 2) is reduced, 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 integrated on the radio frequency transceiving switch circuit chip.
In practical applications, the operation of the series-parallel branch 101 in the rf transceiving switch circuit shown in fig. 4 is as follows:
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 output port Tx of the transmitting path is short-circuited to the ground. In this case, an equivalent T-shaped matching network is formed between the antenna and the input port Rx of the receiving path, that is, a portion of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is an equivalent T-shaped matching network, so that impedance matching of the input from the antenna to the input port Rx of the receiving path can be flexibly adjusted.
When the radio frequency transceiving switching circuit is in a radio frequency transmitting working state, the first switch S1 is closed, the second switch S2 is opened, an equivalent C2-L2-C4 pi-shaped matching network is formed between the antenna and the output port Tx of the transmitting path, namely, the part between the output port Tx of the transmitting path and the antenna in the serial-parallel branch 101 is the second-order LC impedance matching network, and the pi-shaped matching network is obtained after simplification, so that the impedance change and filtering of the output from the antenna to the output port Tx of the transmitting path are realized.
Optionally, on the basis of the rf transceiving switch circuit shown in fig. 4, another serial-parallel branch 101 is further provided in this embodiment, referring to fig. 5, where the serial-parallel branch 101 specifically includes: the inductor comprises a first capacitor C1, a second capacitor C2, 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 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 other end of the second capacitor C2, the other end of the first inductor L1 and the second end of the first switch S1 are all grounded.
The other end of the second inductor L2 is connected to the first end of the second switch S2 and the output port Tx of the transmit path, respectively.
The other end of the second capacitor C2 and the second end 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, on the basis of the radio frequency transceiving switch circuit provided in the embodiment corresponding to fig. 4, two capacitors (a third capacitor C3 and a fourth capacitor C4 in fig. 4) are further reduced, 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 integrated on the radio frequency transceiving switch circuit chip.
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 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 output port Tx of the transmitting path is short-circuited to the ground. At this time, the antenna is connected to the ground in parallel through L2 and C2, and an LC-type matching network is formed between the antenna and the input port Rx of the receiving path, that is, the LC-type matching network is obtained by simplifying a T-type matching network in which a portion of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is equivalent, so that impedance matching of input between the antenna and the input port Rx of the receiving path can be flexibly adjusted.
When the radio frequency transceiving switching circuit is in a radio frequency transmitting working state, the first switch S1 is closed, the second switch S2 is opened, an equivalent C2-L2 LC type matching network is formed between the antenna and the output port Tx of the transmitting path, namely the part of the series-parallel branch 101 between the antenna and the output port Tx of the transmitting path is an LC type matching network obtained by simplifying a second-order LC impedance matching network, and the impedance change and the filtering of the output from the antenna to the output port Tx of the transmitting path are realized.
Optionally, referring to fig. 6, in practical applications, if the number of the first switches S1 in the radio frequency transceiving switching circuit is 2, the serial-parallel branch 101 in the radio frequency transceiving switching circuit specifically includes: the inductor comprises a first capacitor C1, a second capacitor C2, 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 the connection point is connected to the antenna. The port ANT in fig. 6 is a port connected to an antenna.
The other end of the first capacitor C1 is connected to a first end of a first switch S1, and a second end of the first switch S1 is grounded.
The other end of the first inductor L1 is connected to one end of the second inductor L2, one end of the second capacitor C2, and one end of the third inductor L3, respectively.
The other end of the second capacitor C2 is grounded.
The other end of the second inductor L2 is connected to the first end of the second switch S2 and the output port Tx of the transmit path, respectively, and the second end of the second switch S2 is grounded.
The other end of the third inductor L3 is connected to the first end of the other first switch S1 and the input port Rx of the receiving path, respectively, and the second end of the other first switch S1 is grounded.
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 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 output port Tx of the transmitting path is short-circuited to the ground. At this time, a T-shaped matching network of L1-C2-L3 is formed between the antenna and the input port Rx of the receiving path, that is, the part of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is an equivalent T-shaped matching network. Therefore, the impedance matching of the input from the antenna to the input port Rx of the reception path can be flexibly adjusted regardless of the impedance when the PA connected to the output port Tx of the transmission path is off.
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 input port Rx of the receiving path and the lower pole plate of the first capacitor C1 are both short-circuited to the ground. At this time, the turn-off impedance of the LNA connected to the input port Rx of the receiving path does not need to be considered, an equivalent second-order LC-type matching network is formed between the antenna and the output port Tx of the transmitting path, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmitting path and the antenna is the second-order LC impedance matching network, so that impedance change from the antenna to the output port Tx of the transmitting path can be realized, second-order filtering can be performed on a signal output by the PA through the output port Tx of the transmitting path, second-order and higher-order harmonics output by the PA through the output port Tx of the transmitting path can be greatly suppressed, and the FCC spectrum transmission requirement can be met without adding additional elements.
Optionally, on the basis of fig. 6, please refer to fig. 7, if the number of the first switches S1 in the rf transceiving switch circuit is 2, another form of the series-parallel branch 101 in the rf transceiving switch circuit is: a first capacitor C1, a second capacitor C2, 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 third inductor L3, respectively, and the connection point is connected to the antenna.
The other end of the first capacitor C1 is connected to the first end of a first switch S1, and the second end of the first switch S1 and the other end of the second capacitor C2 are both grounded.
The other end of the second inductor L2 is connected to the first end of the second switch S2 and the output port Tx of the transmit path, respectively, and the second end of the second switch S2 is grounded.
The other end of the third inductor L3 is connected to the first end of the other first switch S1 and the input port Rx of the receiving path, respectively, and the second end of the other first switch S1 is grounded.
It should be noted that, in order to make the integration level of the radio frequency transceiving switch circuit higher, on the basis of the radio frequency transceiving switch circuit provided in the embodiment corresponding to fig. 6, one inductor (inductor L1 in fig. 6) is further reduced, 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 integrated on a radio frequency transceiving switch circuit chip.
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 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 output port Tx of the transmitting path is short-circuited to the ground. At this time, the antenna is connected to the ground in parallel through C2-L2, and an equivalent LC-type matching network is formed between the antenna and the input port Rx of the receiving path at the input port connected to L3 in series to the receiving path, that is, the part of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is an equivalent T-type matching network, and the LC-type matching network is obtained after simplification. Therefore, the impedance matching of the input from the antenna to the input port Rx of the reception path can be flexibly adjusted regardless of the impedance when the PA connected to the output port Tx of the transmission path is off.
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 input port Rx of the receiving path and the lower pole plate of the first capacitor C1 are both short-circuited to the ground. At this time, the antenna is connected in parallel to ground through C1, C2 and L3, and is connected in series L2 to the output end of the transmission path. Therefore, the off-impedance of the LNA connected to the input port Rx of the receiving path does not need to be considered, and an equivalent second-order LC-type matching network is formed between the antenna and the output port Tx of the transmitting path, that is, the portion of the serial-parallel branch 101 between the output port Tx of the transmitting path and the antenna is the second-order LC-impedance matching network, so that the impedance change from the antenna to the output port Tx of the transmitting path can be realized.
Alternatively, referring to fig. 8 based on fig. 7, if the number of the first switches S1 in the rf transceiving switch circuit is 2, the serial-parallel branch 101 in the rf transceiving switch circuit is in another form: the inductor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1 and a third inductor L3.
One end of the first capacitor C1 is connected to one end of the first inductor L1, and the connection point is connected to the antenna.
The other end of the first capacitor C1 is connected to a first end of a first switch S1, and a second end of the first switch S1 is grounded.
The other end of the first inductor L1 is connected to one end of the second capacitor C2, one end of the third capacitor C3, and one end of the third inductor L3, respectively.
The other end of the second capacitor C2 is grounded.
The other end of the third capacitor C3 is connected to the first end of the second switch S2 and the output port Tx of the transmit path, respectively, and the second end of the second switch S2 is grounded.
The other end of the third inductor L3 is connected to the first end of the other first switch S1 and the input port Rx of the receiving path, respectively, and the second end of the other first switch S1 is grounded.
It should be noted that, by replacing the inductor L2 in the radio frequency transceiving switching circuit provided in the embodiment corresponding to fig. 7 with the capacitor C3, the radio frequency transceiving switching circuit can also implement a radio frequency transceiving function, and has the advantages of high versatility, high integration level, good transceiving performance, and the like.
In practical applications, the operation of the series-parallel branch 101 in the rf transceiving switch circuit shown in fig. 8 is as follows:
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 output port Tx of the transmitting path is short-circuited to the ground. At this time, the antenna is connected to the ground in parallel through C2 and C3, and an equivalent T-type matching network is formed between the antenna and the input port Rx of the receiving path, that is, a portion of the serial-parallel branch 101 between the input port Rx of the receiving path and the antenna is an equivalent T-type matching network. Therefore, regardless of the impedance when the PA to which the output port Tx of the transmission path is connected is turned off, the impedance matching of the input between the antenna and the input port Rx of the reception 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 input port Rx of the receiving path and the lower pole plate of the first capacitor C1 are both short-circuited to the ground. At this time, an equivalent pi-type matching network is formed between the antenna and the output port Tx of the transmission path, that is, the part of the serial-parallel branch 101 between the output port Tx of the transmission path and the antenna is a pi-type matching network obtained by simplifying a second-order LC impedance matching network, so that the impedance change from the antenna to the output port Tx of the transmission path can be realized.
Optionally, an embodiment of the present application further provides a radio frequency front-end circuit, please refer to fig. 9, 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 applications, a duplexer may be added to the rf front-end circuit to isolate the transmitting and receiving 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. 10, 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. 10 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. 9, 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 merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, 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 components 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 components and steps of the various examples 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 a … …" does not exclude the presence of another identical element 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 an input port of the receiving path, an output port of the transmitting path and the antenna, the series-parallel branch comprises at least two inductors and at least one capacitor, and 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 second capacitor and one end of the second inductor respectively, and the connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, one end of the third capacitor and the first end of the first switch;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with one end of the fourth capacitor, one end of the third inductor and the first end of the second switch;
the other end of the third inductor is connected with an output port of the transmitting path;
the other end of the fourth capacitor and the second end of the second switch are both grounded;
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 turned off and the second switch is turned on, the part of the serial-parallel branch between the input port of the receiving path and the antenna is a T-shaped matching network or an equivalent or simplified form of the T-shaped matching network; the output port of the transmitting path is short-circuited to the ground, and the antenna is connected to the ground in parallel through a second inductor and a second capacitor;
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; the input port of the receive path is shorted to ground.
2. The radio frequency transmit-receive switch circuit according to claim 1, wherein the series-parallel branch comprises: the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the first inductor and the second inductor;
one end of the first capacitor is connected with one end of the second capacitor and one end of the second inductor respectively, and the connecting point is connected with the antenna;
the other end of the first capacitor is respectively connected with one end of the first inductor, one end of the third capacitor and the first end of the first switch;
the other end of the third capacitor is connected with the input port of the receiving path;
the other end of the second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with one end of the fourth capacitor, the first end of the second switch and the output port of the transmitting path;
the other end of the fourth capacitor and the second end of the second switch are both grounded.
3. The radio frequency transmit-receive switch circuit according to claim 1, wherein the series-parallel branch comprises: the first capacitor, the second capacitor, the first inductor and the second inductor;
one end of the first capacitor is connected with one end of the second capacitor and one end of the second inductor respectively, and the 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 second capacitor, the other end of the first inductor and the second end of the first switch are all grounded;
the other end of the second inductor is respectively connected with 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.
4. The rf transceiving switch circuit of claim 1, wherein the number of the first switches is 2, and the series-parallel branch comprises: the inductor comprises a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor;
one end of the first capacitor is connected with one end of the first inductor, and the connecting point is connected with the antenna;
the other end of the first capacitor is connected with a first end of one first switch, and a second end of the first switch is grounded;
the other end of the first inductor is connected with one end of the second inductor, one end of the second capacitor and one end of the third inductor respectively;
the other end of the second capacitor is grounded;
the other end of the second inductor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is grounded.
5. The rf transceiving switch circuit of claim 1, wherein the number of the first switches is 2, and the series-parallel branch comprises: the first capacitor, 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 third inductor respectively, and a connecting point is connected with the antenna;
the other end of the first capacitor is connected with the first end of one first switch, and the second end of the first switch and the other end of the second capacitor are both grounded;
the other end of the second inductor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is grounded.
6. The rf transceiver switch circuit of claim 1, wherein the number of the first switches is 2, and the series-parallel branches comprise: the first capacitor, the second capacitor, the third capacitor, the first inductor and the third inductor;
one end of the first capacitor is connected with one end of the first inductor, and the connecting point is connected with the antenna;
the other end of the first capacitor is connected with a first end of one first switch, and a second end of the first switch is grounded;
the other end of the first inductor is respectively connected with one end of the second capacitor, one end of the third capacitor and one end of the third inductor;
the other end of the second capacitor is grounded;
the other end of the third capacitor is respectively connected with the first end of the second switch and the output port of the transmitting path, and the second end of the second switch is grounded;
the other end of the third inductor is connected to the first end of the other first switch and the input port of the receiving path, respectively, and the second end of the other first switch is grounded.
7. The radio frequency transmit-receive switch circuit according to any of claims 1-5, 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, baseband circuitry and at least one radio frequency front end circuit as claimed in claim 8.
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| CN114567347B (en) * | 2022-04-29 | 2022-11-18 | 安徽矽磊电子科技有限公司 | Radio frequency front-end circuit |
| CN115173883A (en) * | 2022-07-05 | 2022-10-11 | 成都爱旗科技有限公司 | Transceiver front end architecture |
| CN115622586B (en) * | 2022-12-16 | 2023-03-21 | 西安博瑞集信电子科技有限公司 | High-integration radio frequency switch chip |
| CN116054872A (en) * | 2022-12-20 | 2023-05-02 | 上海唯捷创芯电子技术有限公司 | Radio frequency switch circuit, chip and electronic equipment of quick switching |
| CN115776304B (en) * | 2023-02-07 | 2023-05-12 | 唯捷创芯(天津)电子技术股份有限公司 | Low-loss radio frequency receiving and transmitting front-end module and electronic equipment |
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