CN117200811A - Radio frequency circuit and mobile terminal - Google Patents
Radio frequency circuit and mobile terminal Download PDFInfo
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- CN117200811A CN117200811A CN202210712542.6A CN202210712542A CN117200811A CN 117200811 A CN117200811 A CN 117200811A CN 202210712542 A CN202210712542 A CN 202210712542A CN 117200811 A CN117200811 A CN 117200811A
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Abstract
The application discloses a radio frequency circuit and a mobile terminal, wherein the radio frequency circuit comprises a first antenna, a second antenna, a radio frequency chip, a baseband chip, a first antenna tuner and a second antenna tuner; the baseband chip comprises a first port, the first port is respectively connected with the first antenna tuner and the second antenna tuner through a first control line, the radio frequency chip is respectively connected with the first antenna and the second antenna, the first antenna is connected with the first antenna tuner, and the second antenna is connected with the second antenna tuner; the baseband chip is used for outputting a first control signal to the first antenna tuner and the second antenna tuner through the first port so as to adjust the impedance of the first antenna tuner and the second antenna tuner. The application can effectively reduce the wiring of the control line and save the ports of the baseband chip by multiplexing the control line.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a radio frequency circuit and a mobile terminal.
Background
The antenna tuner is an antenna tuning switch, belongs to an active device, and is similar to a switching device, the antenna tuning switch needs to be controlled to be switched to different channels by using a control signal, and the control signal is transmitted from a baseband chip through a control line on a PCB. Through the preset parameter setting, the baseband chip can send different control commands to control the antenna tuning switch to be switched to the corresponding channel according to different frequency bands of the current working of the antenna, and different impedance matching is conducted, so that the antenna performance is matched with the current working frequency band. The impedance between the radio frequency chip and the antenna is matched under the current working frequency band, so that the maximum antenna gain is achieved.
One antenna tuning switch needs two control lines, and one control line is correspondingly connected with one GPIO port. The control lines between each antenna tuning switch in conventional designs are separate and do not cross and affect each other, so that each switch can be controlled independently. When the number of GPIO control ports of the platform chip is small, the situation that the GPIO ports are not used enough can occur when the control of a plurality of antenna tuning switches is to be realized.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
The application aims to provide a radio frequency circuit and a mobile terminal, which can effectively reduce the wiring of a control line and save ports of a baseband chip by multiplexing the control line so as to solve the problem of insufficient ports when a plurality of tuning switches are controlled.
In order to achieve the above purpose, the application adopts the following technical scheme:
the embodiment of the application provides a radio frequency circuit which comprises a first antenna, a second antenna, a radio frequency chip, a baseband chip, a first antenna tuner and a second antenna tuner; the baseband chip comprises a first port, the first port is respectively connected with the first antenna tuner and the second antenna tuner through a first control line, the radio frequency chip is respectively connected with the first antenna and the second antenna, the first antenna is connected with the first antenna tuner, and the second antenna is connected with the second antenna tuner;
the baseband chip is used for outputting a first control signal to the first antenna tuner and the second antenna tuner through the first port so as to adjust the impedance of the first antenna tuner and the second antenna tuner.
In some embodiments, the baseband chip further includes a second port connected to the first antenna tuner and the second antenna tuner, respectively, through a second control line; the baseband chip is further configured to output a second control signal to the first antenna tuner and the second antenna tuner through the second port, so that the first control signal and the second control signal jointly adjust the impedance of the first antenna tuner and the second antenna tuner.
In some embodiments, the radio frequency circuit, the baseband chip further includes a third port and a fourth port, the third port being connected to the first antenna tuner through a third control line, the fourth port being connected to the second antenna tuner through a fourth control line; the baseband chip is also used for outputting a third control signal to the first antenna tuner through the third port and outputting a fourth control signal to the second antenna tuner through the fourth port, so that the first control signal and the third control signal jointly adjust the impedance of the first antenna tuner, and the first control signal and the fourth control signal jointly adjust the impedance of the second antenna tuner.
In some embodiments, the radio frequency circuit, the first port and the second port are GPIO ports.
In some embodiments, the radio frequency circuit includes a first antenna tuner including four first impedance matching channels, the first antenna tuner being configured to switch on one of the four first impedance matching channels in response to a first control signal and a second control signal.
In some embodiments, the radio frequency circuit, the second antenna tuner comprises four second impedance matching channels, and the second antenna tuner is configured to switch on the four second impedance matching channels according to the first control signal and the second control signal.
In some embodiments, the radio frequency circuit includes a first antenna tuner including four first impedance matching channels, the first antenna tuner being configured to switch on one of the four first impedance matching channels in response to the first control signal and the third control signal.
In some embodiments, the radio frequency circuit, the second antenna tuner comprises four second impedance matching channels, the second antenna tuner being configured to switch on one of the second impedance matching channels in response to the first control signal and the fourth control signal.
In some embodiments, the radio frequency circuit includes a first radio frequency port and a second radio frequency port, the first radio frequency port being connected to the first antenna by a first radio frequency feed line, the second radio frequency port being connected to the second antenna by a second radio frequency feed line.
The embodiment of the application also provides a mobile terminal comprising the radio frequency circuit.
Compared with the prior art, the application provides the radio frequency circuit and the mobile terminal, wherein the radio frequency circuit uses one control line to control two tuners through multiplexing the control lines, and compared with each tuner which adopts independent control lines, the radio frequency circuit can save the use of the control lines, reduce the wiring on a PCB (printed circuit board), and further save GPIO (general purpose input/output) ports of a baseband chip, so that the condition that ports are insufficient when a plurality of tuning switches are controlled is avoided.
Drawings
Fig. 1 is a block diagram of a first configuration of a radio frequency circuit according to the present application.
Fig. 2 is a block diagram of a second structure of the radio frequency circuit provided by the present application.
Fig. 3 is a block diagram of a third configuration of the radio frequency circuit according to the present application.
Detailed Description
The application aims to provide a radio frequency circuit and a mobile terminal, which can effectively reduce the wiring of a control line and save ports of a baseband chip by multiplexing the control line so as to solve the problem of insufficient ports when a plurality of tuning switches are controlled.
In order to make the objects, technical solutions and effects of the present application clearer and more specific, the present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1, a radio frequency circuit provided by the present application includes a first antenna 11, a second antenna 12, a radio frequency chip 31, a baseband chip 32, a first antenna tuner 21 and a second antenna tuner 22; the first antenna 11 includes a first port a connected to the first antenna tuner 21 and the second antenna tuner 22 through the first control line 41, respectively, the radio frequency chip 31 is connected to the first antenna 11 and the second antenna 12, respectively, the first antenna 11 is connected to the first antenna tuner 21, and the second antenna 12 is connected to the second antenna tuner 22.
The rf chip 31 transmits and receives rf signals through the first antenna 11 and the second antenna 12. It should be noted that, in the present embodiment, the number of the rf chip 31 connected to the antennas may be three or more, and each antenna may be correspondingly connected to one tuner, so the number of the corresponding tuners may be three or more, which is not limited to the present application. The baseband chip 32 is configured to output a first control signal to the first antenna tuner 21 and the second antenna tuner 22 through the first port a to adjust the impedance of the first antenna tuner 21 and the second antenna tuner 22. The first control signal in this embodiment may be a high level signal or a low level signal, that is, the first control line 41 may be used to transmit two signals, i.e., a high level signal and a low level signal, respectively. The first control signal is output through the first port a of the baseband chip 32, is transmitted to the first antenna tuner 21 and the second antenna tuner 22 via the first control line 41, and corresponds to multiplexing of the first control line 41 by the first antenna tuner 21 and the second antenna tuner 22, and sharing the first port a. The first port a in this embodiment is a GPIO port. Compared with the independent control line adopted by each tuner, the control line can be saved, the wiring on the PCB is reduced, and GPIO ports of the baseband chip 32 are further saved, so that the condition that ports are insufficient when a plurality of tuning switches are controlled is avoided.
Referring to fig. 2, two control lines are required for one tuner, and thus one control line is required for both the first antenna tuner 21 and the second antenna tuner 22. In some embodiments, the baseband chip 32 further includes a third port C connected to the first antenna tuner 21 through a third control line 43 and a fourth port D connected to the second antenna tuner 22 through a fourth control line 44; the baseband chip 32 is further configured to output a third control signal to the first antenna tuner 21 through the third port C and output a fourth control signal to the second antenna tuner 22 through the fourth port D, so that the first control signal and the third control signal jointly adjust the impedance of the first antenna tuner 21, and the first control signal and the fourth control signal jointly adjust the impedance of the second antenna tuner 22. That is, the first antenna tuner 21 and the second antenna tuner 22 in the present embodiment multiplex only one control line, and the first antenna tuner 21 and the second antenna tuner 22 are controlled by three control lines, namely, the first control line 41, the third control line 43, and the fourth control line 44, respectively. Similarly, the third control signal transmitted by the third control line 43 may be a high level signal or a low level signal, and the fourth control signal transmitted by the fourth control line 44 may be a high level signal or a low level signal.
The first antenna tuner 21 in this embodiment comprises four first impedance matching channels and the second antenna tuner 22 comprises four second impedance matching channels. Specifically, the first antenna tuner 21 includes a first switch, the first switch includes a first common terminal and four first matching terminals, and the first antenna tuner 21 further includes four first matching devices connected to the first matching terminals in a one-to-one correspondence; wherein, the first common terminal is connected with the first antenna 11, and each first matching terminal is connected with the corresponding first matching device to form a first impedance matching channel. Likewise, the second antenna tuner 22 includes a second switch including a second common terminal and four second matching terminals; the second antenna tuner 22 further includes four second matching devices connected in one-to-one correspondence with the second matching terminals, the second common terminal being connected to the second antenna 12, each second matching terminal being connected to a corresponding second matching device to form a second impedance matching channel. The first matching device and the second matching device may be capacitors and/or inductors, and the number of the capacitors and the inductors may be one or more, and the first matching device and the second matching device are not particularly limited in the present application.
Wherein the first antenna tuner 21 is configured to switch on one of the first impedance matching channels according to the first control signal and the third control signal; when the first antenna 11 transmits radio frequency signals with different frequency bands, the baseband chip 32 outputs a first control signal and a third control signal to control the first antenna tuner 21 to be connected to the corresponding first impedance matching channel, so as to realize impedance matching of the first antenna. The second antenna tuner 22 is configured to switch on one of the four second impedance matching channels according to the first control signal and the fourth control signal; when the second antenna 12 transmits radio frequency signals with different frequency bands, the baseband chip 32 outputs the first control signal and the fourth control signal to control the second antenna tuner 22 to be connected to the corresponding second impedance matching channel, so as to realize impedance matching of the second antenna.
When the first control line 41 is multiplexed, the first antenna tuner 21 is still controlled by both the first control line 41 and the third control line 43, while the second antenna tuner 22 is still controlled by both the first control line 41 and the fourth control line 44. Because each control line can transmit high-level signals and low-level signals, four-state control, namely four-matching switching, can be realized for each tuning controller. Each corresponding antenna can realize the receiving and transmitting of radio frequency signals of four frequency bands. Only because of the multiplexing of the first control line 41, when the control signal of the first control line 41 changes, both the first antenna tuner 21 and the second antenna tuner 22 switch states. That is, when the first impedance matching channel of one of the tuners needs to be changed, if this change needs to be achieved by a change in the first control signal transmitted on the multiplexed first control line 41, a corresponding change in the second impedance matching channel of the other tuner is also needed. Each tuner is connected with different antennas, when the mobile terminal works in different frequency bands, namely, when the antennas need to transmit and receive different radio frequency signals, the tuner on the current antenna may need to be switched to different impedance matching channels due to performance requirements, so that impedance matching is realized.
If the frequency bands of the radio frequency signals transmitted and received by each antenna can be B8, B5, B20 and B28, the high level signal is 1, and the low level signal is 0, the corresponding relation between the four states of each tuner under the control of two control signals and the corresponding frequency bands is as follows:
specifically, when the frequency band of the radio frequency signal received by the first antenna 11 is B5, the first control line 41 needs to transmit a low level signal and the third control line 43 needs to transmit a low level signal to the first antenna tuner 21, so that the first antenna tuner 21 is connected to the corresponding first impedance matching channel to match the operating frequency band of the first antenna 11; at this time, the first control line 41 transmits a low level signal to the second antenna tuner 22, and if at this time, the fourth control line 44 also transmits a low level signal, so that the second antenna tuner 22 switches to the corresponding second impedance matching channel to match with the operating frequency band B20 of the second antenna 12. When the frequency band of the radio frequency signal transmitted and received by the first antenna 11 is B5, the control signal of the first control line 41 needs to be changed to a high level at this time, and the corresponding first antenna tuner 21 switches the corresponding first impedance matching channel. At this time, in order for the second antenna tuner 22 to adapt to the variation of the control signal on the first control line 41, the control signal on the fourth control line 44 may be changed to a high level signal, so that the second antenna tuner 22 switches the corresponding second impedance matching channel to match the radio frequency signal in the B5 band on the second antenna 12.
Referring to fig. 3, in some embodiments, two control lines may also be multiplexed simultaneously. In particular, the baseband chip 32 in this embodiment further includes a second port B, where the second port B is connected to the first antenna tuner 21 and the second antenna tuner 22 through a second control line 42, respectively; the baseband chip 32 is further configured to output a second control signal to the first antenna tuner 21 and the second antenna tuner 22 through the second port B to adjust the impedance of the first antenna tuner 21 and the second antenna tuner 22. The second control signal may be a high level signal or a low level signal, and the second port B is a GPIO port. In this embodiment, the first antenna tuner 21 and the second antenna tuner 22 are controlled by the first control line 41 and the second control line 42, the first control line 41 and the second control line 42 are multiplexed, and the baseband chip 32 can control the two tuners by adopting two ports and two control lines, so that the wiring of the control lines can be further reduced, and the GPIO ports of the baseband chip 32 can be saved.
The first antenna tuner 21 in this embodiment includes four first impedance matching channels, and the first antenna tuner 21 is configured to switch on one of the four first impedance matching channels according to the first control signal and the second control signal; the second antenna tuner 22 comprises four second impedance matching channels, and the second antenna tuner 22 is configured to switch on one of the four second impedance matching channels according to the first control signal and the second control signal.
At this time, the first antenna tuner 21 and the second antenna tuner 22 can still achieve switching of four states, but when one of the tuners switches the first impedance matching channel, the second antenna tuner 22 also needs to switch the second impedance matching channel accordingly.
If the frequency bands of the radio frequency signals transmitted and received by each antenna can be B8, B5, B20 and B28, the high level signal is 1, and the low level signal is 0, then the correspondence between the four states of each tuner under the control of two control signals and the corresponding frequency bands in this embodiment is as follows:
specifically, when the frequency band of the radio frequency signal received by the first antenna 11 is B8, the first control line 41 needs to transmit a low level signal and the second control line 42 needs to transmit a low level signal to the first antenna tuner 21, so that the first antenna tuner 21 switches to the corresponding first impedance matching channel to match the operating frequency band of the first antenna 11; at this time, the first control line 41 transmits a low level signal and the second control line 42 transmits a low level signal to the second antenna tuner 22, so that the second antenna tuner 22 is switched to the corresponding second impedance matching channel to match with the B8 band of the second antenna 12. When the frequency band of the radio frequency signal transmitted and received by the first antenna 11 is B5, the control signal of the first control line 41 needs to be changed to a high level at this time, and the corresponding first antenna tuner 21 switches the corresponding first impedance matching channel. At this time, the second antenna tuner 22 also receives the low level signals transmitted by the first control line 41 and the second control line 42, and further switches to the corresponding second impedance matching channel to adapt to the radio frequency signal in the B5 band on the second antenna 12.
If it is not desired that the switching of the impedance matching channels in one tuner affects the other tuner, the same matching device may be used for two impedance matching channels in the other tuner, for example, 10Nh inductance may be used for two of the four second impedance matching channels in the second antenna tuner 22, so that the switching between the two impedance matching channels is performed, and although the impedance matching channels of the second antenna tuner 22 are switched, the impedance matching value connected to the antenna is not changed, and the antenna performance is not affected.
It should be noted that, in the present application, three or more control lines may be multiplexed to realize control over the tuner, so as to reduce the number of GPIO ports required for the baseband chip 32 in the mobile terminal, so that the mobile terminal may use a lower cost chip, and reduce the cost of the mobile terminal; meanwhile, because the control circuit is reduced, the complexity of the circuit design of the PCB is reduced, the space of the PCB is reduced, and the miniaturization design of the PCB is facilitated.
Further, the rf chip 31 includes a first rf port E and a second rf port F, the first rf port E is connected to the first antenna 11 through a first rf feeder 51, the second rf port F is connected to the second antenna 12 through a second rf feeder 52, and the rf chip 31 receives and transmits rf signals through the first antenna 11 and the second antenna 12 to realize an rf signal receiving and transmitting function.
Further, the present application also provides a mobile terminal, which includes the above radio frequency circuit, and since the above detailed description of the radio frequency circuit is omitted here.
In summary, the radio frequency circuit and the mobile terminal provided by the application, wherein the radio frequency circuit comprises a first antenna, a second antenna, a radio frequency chip, a baseband chip, a first antenna tuner and a second antenna tuner; the baseband chip comprises a first port, the first port is respectively connected with the first antenna tuner and the second antenna tuner through a first control line, the radio frequency chip is respectively connected with the first antenna and the second antenna, the first antenna is connected with the first antenna tuner, and the second antenna is connected with the second antenna tuner; the baseband chip is used for outputting a first control signal to the first antenna tuner and the second antenna tuner through the first port so as to adjust the impedance of the first antenna tuner and the second antenna tuner; the application can effectively reduce the wiring of the control line and save the ports of the baseband chip by multiplexing the control line.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present application and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present application as defined in the following claims.
Claims (10)
1. The radio frequency circuit is characterized by comprising a first antenna, a second antenna, a radio frequency chip, a baseband chip, a first antenna tuner and a second antenna tuner; the baseband chip comprises a first port, the first port is respectively connected with the first antenna tuner and the second antenna tuner through a first control line, the radio frequency chip is respectively connected with the first antenna and the second antenna, the first antenna is connected with the first antenna tuner, and the second antenna is connected with the second antenna tuner;
the baseband chip is used for outputting a first control signal to the first antenna tuner and the second antenna tuner through the first port so as to adjust the impedance of the first antenna tuner and the second antenna tuner.
2. The radio frequency circuit of claim 1, wherein the baseband chip further comprises a second port connected to the first antenna tuner and the second antenna tuner, respectively, by a second control line; the baseband chip is further configured to output a second control signal to the first antenna tuner and the second antenna tuner through the second port, so that the first control signal and the second control signal jointly adjust the impedance of the first antenna tuner and the second antenna tuner.
3. The radio frequency circuit of claim 1, wherein the baseband chip further comprises a third port and a fourth port, the third port being connected to the first antenna tuner by a third control line, the fourth port being connected to the second antenna tuner by a fourth control line; the baseband chip is further configured to output a third control signal to the first antenna tuner through a third port, and output a fourth control signal to the second antenna tuner through a fourth port, so that the first control signal and the third control signal jointly adjust the impedance of the first antenna tuner, and the first control signal and the fourth control signal jointly adjust the impedance of the second antenna tuner.
4. The radio frequency circuit of claim 2, wherein the first port and the second port are GPIO ports.
5. The radio frequency circuit of claim 2, wherein the first antenna tuner comprises four first impedance matching channels, the first antenna tuner being configured to switch on one of the four first impedance matching channels in response to the first control signal and the second control signal.
6. The radio frequency circuit of claim 5, wherein the second antenna tuner comprises four second impedance matching channels, the second antenna tuner being configured to switch on one of the four second impedance matching channels in response to the first control signal and the second control signal.
7. The radio frequency circuit of claim 3, wherein the first antenna tuner comprises four first impedance matching channels, the first antenna tuner being configured to switch on one of the four first impedance matching channels in response to the first control signal and the third control signal.
8. The radio frequency circuit of claim 7, wherein the second antenna tuner comprises four second impedance matching channels, the second antenna tuner being configured to switch on one of the four first impedance matching channels in response to the first control signal and the fourth control signal.
9. A radio frequency circuit according to any of claims 1-3, wherein the radio frequency chip comprises a first radio frequency port and a second radio frequency port, the first radio frequency port being connected to the first antenna by a first radio frequency feed line, the second radio frequency port being connected to the second antenna by a second radio frequency feed line.
10. A mobile terminal comprising a radio frequency circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210712542.6A CN117200811A (en) | 2022-06-22 | 2022-06-22 | Radio frequency circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210712542.6A CN117200811A (en) | 2022-06-22 | 2022-06-22 | Radio frequency circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117200811A true CN117200811A (en) | 2023-12-08 |
Family
ID=88996659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210712542.6A Pending CN117200811A (en) | 2022-06-22 | 2022-06-22 | Radio frequency circuit and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117200811A (en) |
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2022
- 2022-06-22 CN CN202210712542.6A patent/CN117200811A/en active Pending
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