CN112436859B - Radio frequency circuit and electronic equipment - Google Patents
Radio frequency circuit and electronic equipment Download PDFInfo
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- CN112436859B CN112436859B CN202011257024.7A CN202011257024A CN112436859B CN 112436859 B CN112436859 B CN 112436859B CN 202011257024 A CN202011257024 A CN 202011257024A CN 112436859 B CN112436859 B CN 112436859B
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- frequency circuit
- gain
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- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Noise Elimination (AREA)
Abstract
The application discloses a radio frequency circuit and an electronic device, wherein the radio frequency circuit comprises an antenna; a first filter, an input end of the first filter being connected to the antenna; the input end of the gain adjusting module is connected with the output end of the first filter; the input end of the second filter is connected with the output end of the gain adjusting module; and the receiver comprises an adjustable gain amplifier, a first interface of the receiver is connected with the output end of the second filter, and a second interface of the receiver is connected with the control end of the gain adjusting module. When the gain value of the adjustable gain amplifier is reduced to the first threshold value, the receiver adjusts the gain adjusting module to improve the gain value of the adjustable gain amplifier, and then the demodulation capacity of the radio frequency circuit under the condition of strong interference is enhanced.
Description
Technical Field
The application belongs to the technical field of electronics, and particularly relates to a radio frequency circuit and electronic equipment.
Background
With the development of Navigation and positioning technologies, users have stronger and stronger dependence on positioning, and Global Navigation Satellite System (GNSS) positioning is a positioning technology often used by people.
In the related art, a filter is disposed in a radio frequency circuit to filter out GNSS out-of-band interference signals, so as to prevent the receiver from being affected by too much out-of-band interference energy.
In the process of implementing the present application, the inventor finds that, although it can provide a good suppression effect on the GNSS out-of-band interference signal, due to the presence of the GNSS in-band strong interference signal in the environment where the user is located, a Variable Gain Amplifiers (VGAs) inside the receiver is seriously saturated, that is, the Gain value of the adjustable Gain amplifier approaches to a negative value, and the noise coefficient of the whole radio frequency circuit is large, so that the electronic device cannot demodulate and locate the signal well, thereby causing a location abnormality, even an inability to locate, and affecting the user experience.
Disclosure of Invention
The present application is directed to a radio frequency circuit and an electronic device that solve at least one of the problems set forth in the background.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a radio frequency circuit, including:
an antenna;
a first filter, an input end of the first filter being connected to the antenna;
the input end of the gain adjusting module is connected with the output end of the first filter;
the input end of the second filter is connected with the output end of the gain adjusting module;
the receiver comprises an adjustable gain amplifier, a first interface of the receiver is connected with the output end of the second filter, and a second interface of the receiver is connected with the control end of the gain adjusting module;
wherein the receiver adjusts the gain adjustment module to increase the gain value of the adjustable gain amplifier when the gain value of the adjustable gain amplifier decreases to a first threshold.
In a second aspect, an embodiment of the present application provides an electronic device, including:
a housing;
at least one radio frequency circuit according to the first aspect above, the radio frequency circuit being disposed in the housing.
In the embodiment of the application, a gain adjusting module is added in the radio frequency circuit, when external interference comes, the gain value of the adjustable gain amplifier will be reduced, and the receiver will adjust the gain adjusting module to increase the gain value of the adjustable gain amplifier under the condition that the gain value of the adjustable gain amplifier is reduced to the first threshold value, so as to ensure that the adjustable gain amplifier is always in a good gain value, and further enhance the demodulation capability of the radio frequency circuit under strong interference signals.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a first radio frequency circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second radio frequency circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third rf circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first electronic device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second electronic device according to an embodiment of the present invention.
Reference numerals:
10-radio frequency circuitry; 110-an antenna; 120-a first filter; 130-a gain adjustment module; 131-a programmable gain amplifier; 132-a varactor diode; 140-a second filter; 150-a receiver; 151-adjustable gain amplifier; 160-low noise amplifier; 170-capacitance; 180-inductance.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present invention, it is to be noted that, unless otherwise specifically stated or limited, the term "connected" means an electrical connection, which may be a direct connection, an indirect connection via an intermediate, or a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a radio frequency circuit which can be applied to electronic equipment products. The electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm computer, or a wearable device, and is not limited herein.
The circuit configuration of the radio frequency circuit according to the embodiment of the present invention is described below with reference to fig. 1 to 3.
As shown in fig. 1, a radio frequency circuit 10 provided according to some embodiments of the present invention includes an antenna 110, a first filter 120, a gain adjustment module 130, a second filter 140, and a receiver 150.
In this embodiment, as shown in fig. 1, an input terminal of the first filter 120 is connected to the antenna 110, an input terminal of the gain adjustment module 130 is connected to an output terminal of the first filter 120, an input terminal of the second filter 140 is connected to an output terminal of the gain adjustment module 130, a first interface of the receiver 150 is connected to an output terminal of the second filter 140, and a second interface of the receiver 150 is connected to a control terminal of the gain adjustment module 130.
In this embodiment, the receiver 150 may be a GNSS receiver to receive and demodulate a Positioning signal, such as a Global Positioning System (GPS) signal. As shown in fig. 1, the receiver 150 includes an adjustable gain amplifier 151.
In this embodiment, the first filter 120 and the second filter 140 can provide a good suppression effect on the GNSS out-of-band interference signal, so as to prevent the out-of-band interference energy from being too large to affect the operation of the adjustable gain amplifier 151.
In this embodiment, when an external interference signal comes in, the gain value of the adjustable gain amplifier 151 may decrease, and the receiver 150 may adjust the gain adjustment module 130 to increase the gain value of the adjustable gain amplifier 151 when the gain value of the adjustable gain amplifier 151 decreases to the first threshold, so as to ensure that the adjustable gain amplifier 151 is always at a good gain value, thereby enhancing the demodulation capability of the radio frequency circuit 10 under a strong interference signal. That is, the dynamic range of the rf circuit 10 is further increased based on the dynamic range of the original adjustable gain amplifier 151, so as to enhance the demodulation capability of the rf circuit 10 under strong interference signals.
The first threshold may be a value set according to an actual operating state of the adjustable gain amplifier 151, and the present embodiment is not limited thereto.
According to the radio frequency circuit provided by the embodiment of the invention, the gain adjusting module is added in the radio frequency circuit, when external interference comes, the gain value of the adjustable gain amplifier can be reduced, and the receiver can adjust the gain adjusting module to improve the gain value of the adjustable gain amplifier under the condition that the gain value of the adjustable gain amplifier is reduced to the first threshold value, so that the noise coefficient of the radio frequency circuit is reduced, the adjustable gain amplifier is ensured to be always in a good gain value, and the demodulation capacity of the radio frequency circuit under a strong interference signal is further improved.
According to some embodiments of the invention, as shown in fig. 2, the Gain adjustment module 130 may be a Programmable Gain Amplifier (PGA) 131. The programmable gain amplifier 131 is a highly versatile amplifier, and its gain value can be controlled as required.
In this embodiment, in an initial state, the programmable gain amplifier 131 is in a highest gain state, and when an external interference signal comes in and causes the gain value of the adjustable gain amplifier 151 to decrease to the first threshold, the receiver 150 controls the programmable gain amplifier 131 to decrease the gain value of the programmable gain amplifier 131 by a control signal, so as to increase the gain value of the adjustable gain amplifier 151, thereby ensuring that the adjustable gain amplifier 151 is always in a good gain value.
When the external environment changes, the interference signal is reduced or disappeared, and the gain value of the adjustable gain amplifier 151 is increased to the second threshold, at this time, the receiver 150 controls the programmable gain amplifier 131 to increase the gain value of the programmable gain amplifier 131 through the control signal, so as to reduce the gain value of the adjustable gain amplifier 151, and further, it is ensured that the adjustable gain amplifier 151 is always at a good gain value.
The above second threshold may be a value set according to an actual operating state of the adjustable gain amplifier 151, and the second threshold is larger than the first threshold.
According to the radio frequency circuit of the embodiment, the programmable gain amplifier is added in the radio frequency circuit, when an external interference signal comes in, the gain value of the adjustable gain amplifier can be reduced, and the receiver adjusts the programmable gain amplifier to reduce the gain value thereof so as to improve the gain value of the adjustable gain amplifier under the condition that the gain value of the adjustable gain amplifier is reduced to the first threshold value, so that the noise coefficient of the radio frequency circuit is reduced, the adjustable gain amplifier is ensured to be always in a good gain value, and the demodulation capability of the radio frequency circuit under a strong interference signal is further enhanced.
By introducing the programmable gain amplifier, the dynamic range of a system level is expanded, the tolerance of the radio frequency circuit to the in-band strong interference signal is enhanced, and the influence of the in-band strong interference signal on the performance of the radio frequency circuit is further reduced.
According to still other embodiments of the present invention, as shown in fig. 3, the gain adjusting module 130 may be a varactor diode 132, a first terminal of the varactor diode 132 is an input terminal, an output terminal, and a control terminal of the gain adjusting module 130, and a second terminal of the varactor diode 132 is grounded.
In this embodiment, when an external interference signal enters and the gain value of the adjustable gain amplifier 151 is reduced to the first threshold, the receiver 150 controls the capacitance value of the varactor 132 to increase through the control signal, and since the second end of the varactor 132 is grounded, the interference signal can be greatly attenuated to the ground, so as to increase the gain value of the adjustable gain amplifier 151, and ensure that the adjustable gain amplifier 151 is always at a good gain value.
When the external environment changes, the interference signal is reduced or disappeared, and the gain value of the adjustable gain amplifier 151 is increased to the second threshold, at this time, the receiver 150 controls the capacitance value of the varactor diode 132 to be reduced through the control signal, so as to reduce the attenuation of the signal, further reduce the gain value of the adjustable gain amplifier 151, and ensure that the adjustable gain amplifier 151 is always at a good gain value.
According to the radio frequency circuit of the embodiment, the varactor is added in the radio frequency circuit, when external interference comes in, the gain value of the adjustable gain amplifier can be reduced, and the receiver adjusts the varactor to increase the capacitance value of the varactor so as to attenuate an interference signal to the ground under the condition that the gain value of the adjustable gain amplifier is reduced to the first threshold value, so that the gain value of the adjustable gain amplifier is increased, the adjustable gain amplifier is ensured to be always at a good gain value, and the demodulation capacity of the radio frequency circuit under a strong interference signal is enhanced.
According to further embodiments of the present invention, as shown in fig. 3, the rf circuit 10 further includes a low noise amplifier 160 and a capacitor 170.
In this embodiment, the input terminal of the low noise amplifier 160 is connected to the output terminal of the first filter 120, and the output terminal of the low noise amplifier 120 is connected to the input terminal of the second filter 140. Wherein the low noise amplifier 160 may amplify the received signal and transmit it to the receiver 150 via the second filter 140.
In this embodiment, the output terminal of the low noise amplifier 160 is connected to the input terminal of the second filter 140 through the capacitor 170.
According to still further embodiments of the present invention, the radio frequency circuit 10 further comprises an inductor 180, as shown in fig. 3.
In this embodiment, a first terminal of the inductor 180 is connected to the first terminal of the varactor 132, a second terminal of the inductor 180 is connected to the second interface of the receiver 150, and the positioning signal and the control signal can be isolated by the inductor 180.
The embodiment of the present invention further provides an electronic device, which may be a mobile phone, a tablet computer, a notebook computer, a palm computer, or a wearable device, and the like, which is not limited herein.
The electronic device includes a housing.
At least one radio frequency circuit 10, wherein the radio frequency circuit 10 is any one of the radio frequency circuits described above, the radio frequency circuit 10 being disposed in a housing.
Further, as shown in fig. 4 and 5, the electronic device includes two radio frequency circuits 10, meanwhile, the operating frequency band of the upper radio frequency circuit is 1559Mhz to 1610Mhz, and the operating frequency band of the lower radio frequency circuit is 1164Mhz to 1189Mhz, and by providing the two radio frequency circuits, the receiving efficiency of the GPS signal can be improved.
In one example, as shown in fig. 4, a radio frequency circuit includes an antenna 110a, a first filter 120a, a programmable gain amplifier 131a, a second filter 140a, and a receiver 150, wherein the receiver 150 includes an adjustable gain amplifier 151 a. The other radio frequency circuit comprises an antenna 110b, a first filter 120b, a programmable gain amplifier 131b, a second filter 140b and a receiver 150, wherein the receiver 150 comprises an adjustable gain amplifier 151 b.
In another example, as shown in fig. 5, a radio frequency circuit includes an antenna 110a, a first filter 120a, a low noise amplifier 160a, a capacitor 170a, a varactor diode 132a, an inductor 180a, a second filter 140a, and a receiver 150, wherein the receiver 150 includes an adjustable gain amplifier 151 a. The other rf circuit comprises an antenna 110b, a first filter 120b, a low noise amplifier 160b, a capacitor 170b, a varactor diode 132b, an inductor 180b, a second filter 140a, and a receiver 150, wherein the receiver 150 comprises an adjustable gain amplifier 151 b.
From the above example, the receiver 150 is shared by two rf circuits, wherein the receiver 150 includes an adjustable gain amplifier 151a and an adjustable gain amplifier 151 b.
As shown in fig. 1, a radio frequency circuit 10 provided according to some embodiments of the present invention includes an antenna 110, a first filter 120, a gain adjustment module 130, a second filter 140, and a receiver 150.
In this embodiment, since the electronic device provided in the embodiment of the present invention includes any one of the radio frequency circuits provided in the radio frequency circuit embodiment section, the electronic device provided in the embodiment of the present invention can implement the same function as any one of the radio frequency circuits provided in the radio frequency circuit embodiment section. Namely, a gain adjusting module is added in the radio frequency circuit, when external interference comes, the gain value of the adjustable gain amplifier can be reduced, and the receiver adjusts the gain adjusting module to improve the gain value of the adjustable gain amplifier under the condition that the gain value of the adjustable gain amplifier is reduced to a first threshold value, so that the adjustable gain amplifier is always in a good gain value, and the demodulation capacity of the radio frequency circuit under strong interference signals is further enhanced.
The above embodiments mainly describe the differences between the corresponding embodiments and other embodiments, and each embodiment may be used alone or in combination with each other, which is not limited herein, and the same or similar parts of each embodiment may be referred to each other.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A radio frequency circuit, comprising:
an antenna;
a first filter, an input end of the first filter being connected to the antenna;
the input end of the gain adjusting module is connected with the output end of the first filter;
the input end of the second filter is connected with the output end of the gain adjusting module;
a receiver, wherein the receiver comprises an adjustable gain amplifier, a first interface of the receiver is connected with an output end of the second filter, and a second interface of the receiver is connected with a control end of the gain adjusting module;
wherein the receiver adjusts the gain adjustment module to increase the gain value of the adjustable gain amplifier if the gain value of the adjustable gain amplifier falls below a first threshold;
the gain adjusting module is a variable capacitance diode, a first end of the variable capacitance diode is an input end, an output end and a control end of the gain adjusting module, and a second end of the variable capacitance diode is grounded;
the radio frequency circuit further comprises an inductor, wherein a first end of the inductor is connected with a first end of the variable capacitance diode, and a second end of the inductor is connected with a second interface of the receiver.
2. The radio frequency circuit of claim 1, further comprising a low noise amplifier,
the input end of the low noise amplifier is connected with the output end of the first filter, and the output end of the low noise amplifier is connected with the input end of the second filter.
3. The radio frequency circuit of claim 2, further comprising a capacitance,
and the output end of the low-noise amplifier is connected with the input end of the second filter through the capacitor.
4. The radio frequency circuit of claim 1, wherein the receiver is a GNSS receiver.
5. An electronic device, comprising:
a housing;
at least one radio frequency circuit according to any one of claims 1-4, the radio frequency circuit being disposed in the housing.
6. The electronic device of claim 5, wherein the electronic device comprises two of the radio frequency circuits, and wherein the two radio frequency circuits share a receiver.
7. The electronic device of claim 6, wherein an operating frequency band of one of the radio frequency circuits is 1559Mhz to 1610Mhz, and an operating frequency band of the other of the radio frequency circuits is 1164Mhz to 1189 Mhz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011257024.7A CN112436859B (en) | 2020-11-11 | 2020-11-11 | Radio frequency circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011257024.7A CN112436859B (en) | 2020-11-11 | 2020-11-11 | Radio frequency circuit and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112436859A CN112436859A (en) | 2021-03-02 |
| CN112436859B true CN112436859B (en) | 2022-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011257024.7A Active CN112436859B (en) | 2020-11-11 | 2020-11-11 | Radio frequency circuit and electronic equipment |
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| CN (1) | CN112436859B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8965317B2 (en) * | 2011-04-26 | 2015-02-24 | Analog Devices, Inc. | RF AGC control |
| CN102868369B (en) * | 2011-07-05 | 2015-05-13 | 杭州中科微电子有限公司 | Radio frequency automatic gain control amplifier |
| CN107390236B (en) * | 2017-05-23 | 2023-03-31 | 青岛海信移动通信技术股份有限公司 | Satellite signal receiving device and method for processing received satellite signal |
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