CN116418353A - Radio frequency circuit, conduction stray attenuation method and device of radio frequency circuit and terminal - Google Patents
Radio frequency circuit, conduction stray attenuation method and device of radio frequency circuit and terminal Download PDFInfo
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- CN116418353A CN116418353A CN202211485643.0A CN202211485643A CN116418353A CN 116418353 A CN116418353 A CN 116418353A CN 202211485643 A CN202211485643 A CN 202211485643A CN 116418353 A CN116418353 A CN 116418353A
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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
- H04B1/02—Transmitters
- H04B1/04—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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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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
Abstract
The embodiment of the invention relates to the field of signal transmission, and discloses a radio frequency circuit, a conduction stray attenuation method and device of the radio frequency circuit and a terminal. In the invention, a strip resistance attenuation circuit is additionally designed at the public end of the signal transmitting circuit, namely between the transmitting chip and the conduction test circuit; the extra band-stop attenuation circuit is connected with the original band-stop attenuation circuit on the public end of the signal transmitting circuit through a connecting circuit; when the original band-stop attenuation circuit cannot meet the optimization of harmonic/non-harmonic conduction strays of the transmitted signals, the new band-stop attenuation circuit is connected to the position of the original band-stop attenuation circuit in the signal transmitting circuit through the connecting circuit, and the original band-stop attenuation circuit is disconnected from the signal transmitting circuit, so that the optimization of conduction strays of more types of transmitted signals is met; meanwhile, the circuit can be realized by adding a simple circuit structure, and has good effect and low cost.
Description
Technical Field
The embodiment of the invention relates to the field of signal transmission, in particular to a radio frequency circuit.
Background
In the existing mobile phone radio frequency circuit design, the signal transmission path of the communication network GSM900 is generally a transceiver transmitter- & gt transmitter TXM (including 2G power amplifier 2 GPA) & gt radio frequency conduction test seat, and the conduction stray CSE harmonic interference (test seat test) generated by 2GPA can only be attenuated by adding impedance networks such as low pass/band stop through a public terminal (between the TXM and the conduction test seat).
In the related art, all frequency bands are usually designed to be located at the same public end, when the communication network GSM900 generates the third harmonic of the frequency band at 2640-2745MHz for various reasons, the frequency band range of the third harmonic overlaps with the frequency band range 2496-2690MHz of the 4G communication B41, if the GSM900 third harmonic attenuation network is added at the public end, the B41 passband performance is necessarily affected, so that the conventional design cannot consider the optimal design of the third harmonic of the GSM900, and the third harmonic of the GSM900 affects the communication quality when the communication is carried out through the communication network GSM 900.
Disclosure of Invention
The embodiment of the invention aims to provide a radio frequency circuit, a conduction spurious attenuation method, a device and a terminal of the radio frequency circuit, so that the influence of third harmonic of a GSM900 on communication quality can be effectively reduced when the communication network GSM900 is used for communication, and the communication quality of other frequency bands is not influenced when the communication of other frequency bands is used.
In order to solve the above technical problems, an embodiment of the present invention provides a radio frequency circuit, including: the circuit comprises a signal transmitting circuit, a first band-resistance attenuation circuit, a second resistance attenuation circuit, a first connecting circuit and a second connecting circuit;
the signal transmitting circuit comprises a transmitting chip and a conduction testing circuit;
the first end of the first band-stop attenuation circuit is connected with the transmitting chip through a first connecting circuit, and the second end of the first band-stop attenuation circuit is connected with the conduction test circuit through a second connecting circuit;
the first end of the second band-stop attenuation circuit is connected with the transmitting chip through the first connecting circuit, and the second end of the second band-stop attenuation circuit is connected with the conduction test circuit through the second connecting circuit;
the first connecting circuit and the second connecting circuit are used for connecting the first band-stop attenuation circuit into the signal transmitting circuit when the conduction spurious frequency of the signal transmitted by the terminal is in the first frequency range; when the conduction spurious frequency of the signal transmitted by the terminal is in a second frequency range, a second band-stop attenuation circuit is connected to the signal transmitting circuit;
the first band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a first frequency band range, and the second band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a second frequency band range.
The embodiment of the invention also provides a conduction stray attenuation method of the radio frequency circuit, which comprises the following steps: acquiring a transmission signal and a conduction spurious frequency of the transmission signal;
when the conduction stray frequency of the transmitting signal is in the first frequency range, the first band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and the second band-stop attenuation circuit is disconnected;
when the conduction stray frequency of the transmitting signal is in the second frequency range, the second band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and meanwhile, the first band-stop attenuation circuit is disconnected;
the first band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a first frequency band range, and the second band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a second frequency band range.
The embodiment of the invention also provides a radio frequency device which is characterized by comprising the radio frequency circuit.
The embodiment of the invention also provides a terminal which is characterized by comprising the radio frequency circuit in the embodiment.
In the embodiment of the invention, a strip resistance attenuation circuit is additionally designed at the public end of the signal transmitting circuit, namely between the transmitting chip and the conduction test circuit; the extra band-stop attenuation circuit is connected with the original band-stop attenuation circuit on the public end of the signal transmitting circuit through a connecting circuit; when the original band-stop attenuation circuit cannot meet the optimization of harmonic/non-harmonic conduction strays of the transmitted signals, the new band-stop attenuation circuit is connected to the position of the original band-stop attenuation circuit in the signal transmitting circuit through the connecting circuit, and the original band-stop attenuation circuit is disconnected from the signal transmitting circuit, so that the optimization of conduction strays of more types of transmitted signals is met; meanwhile, the circuit can be realized by adding a simple circuit structure, so that the effect is good and the cost is reduced.
In addition, in one example, the first connection circuit and the second connection circuit are both single pole double throw radio frequency switches;
the first single-pole double-throw radio frequency switch comprises a first fixed end, a first switching end and a second switching end, wherein the first fixed end is connected with the output end of the transmitting chip, the first switching end is connected with the input end of the first band-stop attenuation circuit, and the second switching end is connected with the input end of the second band-stop attenuation circuit;
the second single-pole double-throw radio frequency switch comprises a second fixed end, a third switching end and a fourth switching end, wherein the second fixed end is connected with the input end of the conduction test circuit, the third switching end is connected with the output end of the first band-stop attenuation circuit, and the fourth switching end is connected with the output end of the second band-stop attenuation network. The novel band-stop attenuation circuit and the original band-stop attenuation circuit are simultaneously connected between the transmitting chip of the signal transmitting circuit and the conduction test circuit by using the two single-pole double-throw radio frequency switches as the connecting circuits, and the switching of different band-stop attenuation circuits can be realized by only changing the connection mode of the two switches, so that the implementation is faster and more convenient, and the circuit structure is simplified.
Additionally, in one example, the first band-stop attenuation circuit includes: a first inductor and a first capacitor;
the first end of the first inductor is connected with the first switching section of the first single-pole double-throw radio frequency switch and the third switching end of the second single-pole double-throw radio frequency switch, and the second end of the first inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is grounded;
the capacitance value of the first capacitor and the inductance value of the first inductor have a corresponding relation with the first frequency range. The conduction stray of signals in the signal transmitting circuit can be reduced through the capacitance and the inductance of two components with matched capacitance and inductance, the circuit structure is further simplified, and the implementation is convenient.
In addition, in one example, the first band range is 1760-1830MHz; the second frequency range is greater than 2700MHZ. The specific values of the first frequency range and the second frequency range can be limited according to different use requirements of the radio frequency circuit, so that conduction spurious optimization of more frequency ranges is realized.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic diagram of a radio frequency circuit structure according to an embodiment of the invention;
fig. 2 is a flow chart of a method for conductive spurious attenuation of a radio frequency circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present invention, and the embodiments can be mutually combined and referred to without contradiction.
One embodiment of the invention relates to a radio frequency circuit which can be applied to terminal equipment such as mobile phones, computers and the like. In this embodiment, there is provided a radio frequency circuit including: the circuit comprises a signal transmitting circuit, a first band-resistance attenuation circuit, a second resistance attenuation circuit, a first connecting circuit and a second connecting circuit; the signal transmitting circuit comprises a transmitting chip and a conduction testing circuit; the first end of the first band-stop attenuation circuit is connected with the transmitting chip through a first connecting circuit, and the second end of the first band-stop attenuation circuit is connected with the conduction test circuit through a second connecting circuit; the first end of the second band-stop attenuation circuit is connected with the transmitting chip through the first connecting circuit, and the second end of the second band-stop attenuation circuit is connected with the conduction test circuit through the second connecting circuit; the first connecting circuit and the second connecting circuit are used for connecting the first band-stop attenuation circuit into the signal transmitting circuit when the conduction spurious frequency of the signal transmitted by the terminal is in the first frequency range; when the conduction spurious frequency of the signal transmitted by the terminal is in a second frequency range, a second band-stop attenuation circuit is connected to the signal transmitting circuit; the first band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a first frequency band range, and the second band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a second frequency band range. A strip resistance attenuation circuit is additionally designed between the common end of the signal transmitting circuit, namely the transmitting chip and the conduction test circuit; the extra band-stop attenuation circuit is connected with the original band-stop attenuation circuit on the public end of the signal transmitting circuit through a connecting circuit; when the original band-stop attenuation circuit cannot meet the optimization of harmonic/non-harmonic conduction strays of the transmitted signals, the new band-stop attenuation circuit is connected to the position of the original band-stop attenuation circuit in the signal transmitting circuit through the connecting circuit, and the original band-stop attenuation circuit is disconnected from the signal transmitting circuit, so that the optimization of conduction strays of more types of transmitted signals is met; meanwhile, the circuit can be realized by adding a simple circuit structure, so that the effect is good and the cost is reduced. The implementation details of the radio frequency circuit of this embodiment are specifically described below, and the following description is merely provided for understanding the implementation details, and is not necessary to implement this embodiment.
The circuit structure diagram of the radio frequency circuit is shown in fig. 1, wherein the signal transmitting circuit comprises a P1TRC radio frequency transceiver, a P2TXM transmitting chip, a P3 first connection circuit, a P6 second connection circuit, a P4 first band-stop attenuation circuit, a P5 second band-stop attenuation circuit and a P7 conduction test circuit. The common end of the signal transmitting circuit comprises a transmitting chip P2 and a conduction test circuit P7; the first end of the first band-stop attenuation circuit P4 is connected with the transmitting chip P2 through a first connecting circuit P3, and the second end of the first band-stop attenuation circuit P4 is connected with the conduction test circuit P7 through a second connecting circuit P6; the first end of the second band-stop attenuation circuit P5 is connected with the transmitting chip P2 through the first connecting circuit P3, and the second end of the second band-stop attenuation circuit P5 is connected with the conduction test circuit P7 through the second connecting circuit P6; the first connection circuit P3 and the second connection circuit P6 are used for connecting the first band-stop attenuation circuit P4 into the signal transmitting circuit when the conduction spurious frequency of the signal transmitted by the terminal is in the first frequency range; when the conduction spurious frequency of the signal transmitted by the terminal is in a second frequency range, a second band-stop attenuation circuit P5 is connected to the signal transmitting circuit; the first band-stop attenuation circuit P4 is used for attenuating the conduction spurious of the frequency in the first frequency band range, and the second band-stop attenuation circuit P5 is used for attenuating the conduction spurious of the frequency in the second frequency band range.
In one example, the first connection circuit P3 and the second connection circuit P6 are both single pole double throw radio frequency switches;
the first single-pole double-throw radio frequency switch P3 comprises a first fixed end, a first switching end and a second switching end, wherein the first fixed end is connected with the output end of the transmitting chip, the first switching end is connected with the input end of the first band-stop attenuation circuit, and the second switching end is connected with the input end of the second band-stop attenuation circuit;
the second single-pole double-throw radio frequency switch P6 comprises a second fixed end, a third switching end and a fourth switching end, wherein the second fixed end is connected with the input end of the conduction test circuit, the third switching end is connected with the output end of the first band-stop attenuation circuit, and the fourth switching end is connected with the output end of the second band-stop attenuation network. When the conduction spurious frequency of the signal transmitted by the terminal is in the first frequency range, the first connecting circuit P3 and the second connecting circuit P6 dial the moving end of the switch upwards at the same time, so that the first band-stop attenuation circuit P4 is connected into the whole signal transmitting circuit, and the original second band-stop attenuation circuit in the signal transmitting circuit is disconnected. The novel band-stop attenuation circuit and the original band-stop attenuation circuit are simultaneously connected between the transmitting chip of the signal transmitting circuit and the conduction test circuit by using the two single-pole double-throw radio frequency switches as the connecting circuits, and the switching of different band-stop attenuation circuits can be realized by only changing the connection mode of the two switches, so that the implementation is faster and more convenient, and the circuit structure is simplified.
In one example, the first band-stop attenuation circuit P4 includes: a first inductor and a first capacitor;
the first end of the first inductor is connected with the first switching section of the first single-pole double-throw radio frequency switch P3 and the third switching end of the second single-pole double-throw radio frequency switch P6, and the second end of the first inductor is connected with the first end of the first capacitor; the second end of the first capacitor is grounded; the capacitance value of the first capacitor and the inductance value of the first inductor have a corresponding relation with the first frequency range.
In one example, the first band range is 1760-1830MHz; the second frequency range is greater than 2700MHZ. The specific values of the first frequency range and the second frequency range can be limited according to different use requirements of the radio frequency circuit. For example: in the conventional mobile phone radio frequency circuit design, the circuit structure of the normal transmitting path of the GSM900 signal is the CSE harmonic interference generated by P1-P2 (including 2 GPA) -P7 and 2GPA in fig. 1, and the CSE harmonic frequency band signal intensity can be attenuated only by adding impedance networks such as low pass/band stop through a public terminal (between P2 and P7). However, the third harmonic 2640-2745MHZ of GSM900 overlaps with the frequency range 2496-2690MHZ of B41, if the third harmonic attenuation network of GSM900 is added to the public end, the B41 passband performance will be affected (in the case that all frequency ranges are designed to be on the same public end in general), so that the conventional design will not consider the reservation of the optimal design for the third harmonic of GSM 900. When the optimization problem of the third harmonic of the GSM900 is solved, the first frequency range is set to 2640-2745MHz, and the second frequency range is set to be larger than 2754MHz. Because CSE performance of the radio frequency products on the market is uneven, the CSE level of the third harmonic of the GSM900 is about-33-40 dBm, and some products have a lower limit on the CSE level, the risk problem of lower than CSE CE regulation standard (30 dBm) and insufficient margin can occur, and the third harmonic CSE of the GSM900 can be optimized after the first frequency range is set to 2640-2745MHz, so that the margin is greatly improved. It should be noted that, in the embodiment, specific values of the first frequency band range and the second frequency band range are not limited, and in specific implementation, those skilled in the art may set the first frequency band range and the second frequency band range according to actual requirements to optimize conduction spurs of different signals.
In this embodiment, a band-stop attenuation circuit is additionally designed at the common end of the signal transmitting circuit, namely between the transmitting chip and the conduction test circuit; the extra band-stop attenuation circuit is connected with the original band-stop attenuation circuit on the public end of the signal transmitting circuit through a connecting circuit; when the original band-stop attenuation circuit cannot meet the optimization of harmonic/non-harmonic conduction strays of the transmitted signals, the new band-stop attenuation circuit is connected to the position of the original band-stop attenuation circuit in the signal transmitting circuit through the connecting circuit, and the original band-stop attenuation circuit is disconnected from the signal transmitting circuit, so that the optimization of conduction strays of more types of transmitted signals is met; meanwhile, the circuit can be realized by adding a simple circuit structure, so that the effect is good and the cost is reduced.
Another embodiment of the invention relates to a conductive spurious attenuation method of a radio frequency circuit, which is applied to a signal transmitting terminal. In this embodiment, first, a transmission signal and a conduction spurious frequency of the transmission signal are acquired; when the conduction stray frequency of the transmitting signal is in the first frequency range, the first band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and the second band-stop attenuation circuit is disconnected; when the conduction stray frequency of the transmitting signal is in the second frequency range, the second band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and meanwhile, the first band-stop attenuation circuit is disconnected; the first band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a first frequency band range, and the second band-stop attenuation circuit is used for attenuating conduction strays of frequencies in a second frequency band range. Implementation details of the conductive spurious attenuation method of the radio frequency circuit of this embodiment are specifically described below, and the following is merely provided for understanding the implementation details, and is not necessary to implement this embodiment.
As shown in fig. 2, a specific flowchart of a method for attenuating conductive spurious emissions of a radio frequency circuit according to this embodiment is that in step 201, a transmission signal and a conductive spurious frequency of the transmission signal are first obtained.
In one example, the acquired transmission signal may be transmitted by a terminal such as a mobile phone or a computer. The frequency band of the signal is not limited.
In step 202, it is determined whether the conducted spurious frequencies of the transmitted signal are within a first frequency band or a second frequency band.
In step 203-1, if the conduction spurious frequency of the transmission signal is within the first frequency range, switching the first band-stop attenuation circuit between the transmission chip and the conduction test circuit, and simultaneously switching off the second band-stop attenuation circuit; if the conducted spurious frequencies of the transmit signal are within the second frequency band, step 203-2, a second band-stop attenuation circuit is connected between the transmit chip and the conduction test circuit while the first band-stop attenuation circuit is disconnected.
In one example, switching the first band-stop attenuator circuit between the transmit chip and the conduction test circuit while switching off the second band-stop attenuator circuit includes:
controlling a first single-pole double-throw radio frequency switch and a second single-pole double-throw radio frequency switch, pulling the first single-pole double-throw radio frequency switch to a first switching end, so that a first fixed end is conducted with the first switching end, and the first fixed end is disconnected with the second switching end;
pulling the second single-pole double-throw radio frequency switch to a third switching end; the second fixed end is conducted with the third switching end, and the second fixed end is disconnected with the fourth switching end; the first fixed end of the first single-pole double-throw radio frequency switch is connected with the output end of the transmitting chip, the first switching end is connected with the input end of the first band-stop attenuation circuit, and the second switching end is connected with the input end of the second band-stop attenuation circuit; the second fixed end of the second single-pole double-throw radio frequency switch is connected with the input end of the conduction test circuit, the third switching end is connected with the output end of the first band-stop attenuation circuit, and the fourth switching end is connected with the output end of the second band-stop attenuation circuit.
In one example, switching a second band-stop attenuator circuit between a transmit chip and the conduction test circuit while switching off the first band-stop attenuator circuit includes:
pulling the first single-pole double-throw radio frequency switch to a second switching end, so that a first fixed end is conducted with the second switching end, and the first fixed end is disconnected with the first switching end; pulling the second single-pole double-throw radio frequency switch to a fourth switching end; the second fixed end is conducted with the fourth switching end, and the second fixed end is disconnected with the third switching end.
In this embodiment, a strip resistance attenuation circuit is additionally designed at the common end of the signal transmitting circuit, namely between the transmitting chip and the conduction test circuit; the extra band-stop attenuation circuit is connected with the original band-stop attenuation circuit on the public end of the signal transmitting circuit through a connecting circuit; when the original band-stop attenuation circuit cannot meet the optimization of harmonic/non-harmonic conduction strays of the transmitted signals, the new band-stop attenuation circuit is connected to the position of the original band-stop attenuation circuit in the signal transmitting circuit through the connecting circuit, and the original band-stop attenuation circuit is disconnected from the signal transmitting circuit, so that the optimization of conduction strays of more types of transmitted signals is met; meanwhile, the circuit can be realized by adding a simple circuit structure, so that the effect is good and the cost is reduced.
The above method is divided into steps, which are only for clarity of description, and may be combined into one step or split into multiple steps when implemented, so long as they include the same logic relationship, and they are all within the protection scope of this patent; it is within the scope of this patent to add insignificant modifications to the algorithm or flow or introduce insignificant designs, but not to alter the core design of its algorithm and flow.
One embodiment of the invention relates to a radio frequency device comprising: such as any of the radio frequency circuit embodiments described above.
An embodiment of the present invention relates to a terminal including: a radio frequency circuit as in any of the above radio frequency circuit embodiments.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A radio frequency circuit, comprising: the device comprises a signal transmitting circuit, a first band-stop attenuation circuit, a second band-stop attenuation circuit, a first connecting circuit and a second connecting circuit;
the signal transmitting circuit comprises a transmitting chip and a conduction testing circuit;
the first end of the first band-stop attenuation circuit is connected with the transmitting chip through the first connecting circuit, and the second end of the first band-stop attenuation circuit is connected with the conduction test circuit through the second connecting circuit;
the first end of the second band-stop attenuation circuit is connected with the transmitting chip through the first connecting circuit, and the second end of the second band-stop attenuation circuit is connected with the conduction test circuit through the second connecting circuit;
the first connection circuit and the second connection circuit are used for connecting the first band-stop attenuation circuit into the signal transmitting circuit when the conduction spurious frequency of the signal transmitted by the terminal is in a first frequency range; when the conduction spurious frequency of the signal transmitted by the terminal is in a second frequency range, the second band-stop attenuation circuit is connected to the signal transmitting circuit;
the first band-stop attenuation circuit is used for attenuating conductive strays of frequencies in the first frequency range, and the second band-stop attenuation circuit is used for attenuating conductive strays of frequencies in the second frequency range.
2. The radio frequency circuit of claim 1, wherein the first connection circuit and the second connection circuit are each single pole double throw radio frequency switches;
the first single-pole double-throw radio frequency switch comprises a first fixed end, a first switching end and a second switching end, wherein the first fixed end is connected with the output end of the transmitting chip, the first switching end is connected with the input end of the first band-stop attenuation circuit, and the second switching end is connected with the input end of the second band-stop attenuation circuit;
the second single-pole double-throw radio frequency switch comprises a second fixed end, a third switching end and a fourth switching end, wherein the second fixed end is connected with the input end of the conduction test circuit, the third switching end is connected with the output end of the first band-stop attenuation circuit, and the fourth switching end is connected with the output end of the second band-stop attenuation network.
3. The radio frequency circuit of claim 2, wherein the first band reject circuit comprises: a first inductor and a first capacitor;
the first end of the first inductor is connected with the first switching section of the first single-pole double-throw radio frequency switch and the third switching end of the second single-pole double-throw radio frequency switch, and the second end of the first inductor is connected with the first end of the first capacitor;
the second end of the first capacitor is grounded.
4. The radio frequency circuit of claim 3, wherein a capacitance value of the first capacitor and an inductance value of the first inductor have a correspondence with the first frequency band range.
5. The radio frequency circuit of claim 1, wherein the first frequency range is 1760-1830MHZ;
the second frequency range is greater than 2700MHZ.
6. A method of conductive spurious attenuation for a radio frequency circuit, comprising:
acquiring a transmission signal and a conduction spurious frequency of the transmission signal;
when the conduction stray frequency of the transmitting signal is in a first frequency range, a first band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and a second band-stop attenuation circuit is disconnected at the same time;
when the conduction stray frequency of the transmitting signal is in a second frequency range, a second band-stop attenuation circuit is connected between the transmitting chip and the conduction test circuit, and meanwhile, the first band-stop attenuation circuit is disconnected;
the first band-stop attenuation circuit is used for attenuating conductive strays of frequencies in the first frequency range, and the second band-stop attenuation circuit is used for attenuating conductive strays of frequencies in the second frequency range.
7. The method of claim 6, wherein said switching the first band-stop attenuator circuit between the transmit chip and the conduction test circuit while switching the second band-stop attenuator circuit off comprises:
controlling a first single-pole double-throw radio frequency switch and a second single-pole double-throw radio frequency switch, pulling the first single-pole double-throw radio frequency switch to a first switching end, so that a first fixed end is conducted with the first switching end, and the first fixed end is disconnected with the second switching end;
pulling the second single-pole double-throw radio frequency switch to a third switching end; the second fixed end is conducted with the third switching end, and the second fixed end is disconnected with the fourth switching end;
the first fixed end of the first single-pole double-throw radio frequency switch is connected with the output end of the transmitting chip, the first switching end is connected with the input end of the first band-stop attenuation circuit, and the second switching end is connected with the input end of the second band-stop attenuation circuit;
the second fixed end of the second single-pole double-throw radio frequency switch is connected with the input end of the conduction test circuit, the third switching end is connected with the output end of the first band-stop attenuation circuit, and the fourth switching end is connected with the output end of the second band-stop attenuation circuit.
8. The method of claim 7, wherein said switching a second band-stop attenuator circuit between the transmit chip and the conduction test circuit while switching off a first band-stop attenuator circuit comprises:
the first single-pole double-throw radio frequency switch is shifted to a second switching end, so that the first fixed end is conducted with the second switching end, and the first fixed end is disconnected with the first switching end;
pulling the second single-pole double-throw radio frequency switch to the fourth switching end; and the second fixed end is conducted with the fourth switching end, and the second fixed end is disconnected with the third switching end.
9. A radio frequency device comprising a radio frequency circuit as claimed in any one of claims 1 to 5.
10. A terminal comprising the radio frequency circuit of any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211485643.0A CN116418353A (en) | 2022-11-24 | 2022-11-24 | Radio frequency circuit, conduction stray attenuation method and device of radio frequency circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211485643.0A CN116418353A (en) | 2022-11-24 | 2022-11-24 | Radio frequency circuit, conduction stray attenuation method and device of radio frequency circuit and terminal |
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| CN116418353A true CN116418353A (en) | 2023-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211485643.0A Pending CN116418353A (en) | 2022-11-24 | 2022-11-24 | Radio frequency circuit, conduction stray attenuation method and device of radio frequency circuit and terminal |
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| CN (1) | CN116418353A (en) |
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2022
- 2022-11-24 CN CN202211485643.0A patent/CN116418353A/en active Pending
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