CN215990916U - Noise reduction system and mobile device - Google Patents
Noise reduction system and mobile device Download PDFInfo
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- CN215990916U CN215990916U CN202122371224.1U CN202122371224U CN215990916U CN 215990916 U CN215990916 U CN 215990916U CN 202122371224 U CN202122371224 U CN 202122371224U CN 215990916 U CN215990916 U CN 215990916U
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Abstract
The application relates to the technical field of mobile equipment, in particular to a noise reduction system and mobile equipment. The noise reduction system comprises a battery, a radio frequency module, a power supply rejection ratio improving module and an audio power amplifier; the positive electrode of the battery is connected with the first end of the radio frequency module and the first end of the power supply rejection ratio improving module, the second end of the power supply rejection ratio improving module is connected with the first end of the audio power amplifier, and the second end of the radio frequency module and the second end of the audio power amplifier are both connected with the negative electrode of the battery; wherein the power supply rejection ratio improving module is configured to improve the power supply rejection ratio of the battery. The technical scheme of the application can reduce the TDD noise of the mobile equipment.
Description
Technical Field
The embodiment of the application relates to the technical field of mobile equipment, in particular to a noise reduction system and mobile equipment.
Background
With the development of science and technology, more and more mobile devices enter the lives of people, such as mobile phones, notebook computers, tablet computers, intelligent wearable devices and the like, and the mobile devices not only can provide various entertainment, but also greatly facilitate the lives of people.
At present, Mobile devices such as Mobile phones and the like mostly adopt monocells for power supply, in a power supply loop, because power supply wiring and batteries both have certain impedance, and a Global System for Mobile Communications (GSM) adopts time division multiple access technology coding, a radio frequency power amplifier transmits a pulse every 4.6ms, and a peak value of transmitting current under maximum power can reach 1.5A, therefore, the radio frequency power supply loop can generate voltage drop with fixed frequency during GSM communication, and the frequency is: 1/4.6 ms-217 Hz. This voltage drop (also called ripple) at 217Hz can cause the mobile device to generate audible Time Division Distortion (TDD) noise, which can significantly affect the user experience.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a noise reduction system and a mobile device aiming at reducing TDD noise of the mobile device.
The embodiment of the application provides a noise reduction system, which comprises a battery, a radio frequency module, a power supply rejection ratio improving module and an audio power amplifier; the positive electrode of the battery is connected with the first end of the radio frequency module and the first end of the power supply rejection ratio improving module, the second end of the power supply rejection ratio improving module is connected with the first end of the audio power amplifier, and the second end of the radio frequency module and the second end of the audio power amplifier are both connected with the negative electrode of the battery; wherein the power supply rejection ratio improving module is configured to improve the power supply rejection ratio of the battery.
In one embodiment, the noise reduction system further comprises a first capacitance and/or a second capacitance; the first end of the first capacitor is connected with the second end of the radio frequency module, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the second end of the audio power amplifier, and the second end of the second capacitor is grounded. The first capacitor and/or the second capacitor are ceramic capacitors.
In one embodiment, the noise reduction system further includes a switch, where the switch includes a common terminal, a first shunt terminal, and a second shunt terminal, the common terminal is connected to the first terminal of the rf module, the first shunt terminal is connected to the first terminal of the power supply rejection ratio improving module, and the second shunt terminal is connected to the second terminal of the power supply rejection ratio improving module.
In one embodiment, when the radio frequency module is in operation, the common terminal is connected to the first shunt terminal; and when the radio frequency module does not work, the public end is connected with the second shunt end.
In one embodiment, the diverter switch is a single pole double throw switch.
In one embodiment, the power supply rejection ratio of the power supply rejection ratio improvement module is greater than 60 dB.
The embodiment of the application also provides mobile equipment comprising the noise reduction system provided by the embodiment of the application.
The embodiment of the application provides a noise reduction system, improve the module through setting up the power supply rejection ratio between battery and audio power amplifier, utilize the power supply rejection ratio to improve the power supply rejection ratio that the module improved the battery, before the battery supplies power for audio power amplifier, can effectively reduce the power network 217Hz interference that the radio frequency module caused under big transmitting power during GSM communication, thereby audio power amplifier can be with 217Hz interference suppression, and then can eliminate the sound that "invigorates" that produces during GSM communication, reduce the TDD noise promptly.
Drawings
FIG. 1 is a circuit diagram of a noise reduction system provided in an embodiment of the present application;
FIG. 2 is a circuit diagram of another noise reduction system provided in an embodiment of the present application;
FIG. 3 is a circuit diagram of another noise reduction system provided in an embodiment of the present application;
fig. 4 is a circuit diagram of another noise reduction system provided in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a circuit diagram of a noise reduction system is provided, which can be configured in a mobile device to reduce TDD noise of the mobile device when implementing GSM communication, and the mobile device can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices.
In this embodiment, the noise reduction system includes a battery 1, a radio frequency module 2, a power supply rejection ratio improving module 4, and an audio power amplifier 5. The positive electrode of the battery 1 is connected with the first end of the radio frequency module 2 and the first end of the power supply rejection ratio improving module 4, the second end of the power supply rejection ratio improving module 4 is connected with the first end of the audio power amplifier 5, and the second end of the radio frequency module 2 and the second end of the audio power amplifier 5 are both connected with the negative electrode of the battery 1; the power supply rejection ratio increasing module 4 is configured to increase the power supply rejection ratio of the battery 1.
When GSM communicates, under the condition of maximum transmitting power, the rf module 2 may transmit a signal at 217Hz frequency, resulting in 217Hz interference in the power network, and the audio power amplifier 5 may amplify the 217Hz interference when powered by the power with 217Hz interference, so as to generate "nuisance" sound, i.e. TDD noise. At this time, the power supply rejection ratio improving module 4 is arranged between the battery 1 and the audio power amplifier 5, the power supply rejection ratio of the battery 1 is improved by the power supply rejection ratio improving module 4, the 217Hz interference of the power supply is reduced firstly, then the power is supplied to the audio power amplifier 5, the 217Hz interference of the power supply can be effectively inhibited, and the TDD noise is reduced.
In this embodiment, the rf module 2 may include an rf power amplifier (rf power amplifier) and an rf chip. The power supply rejection ratio improving module 4 may be a high efficiency, Low Dropout linear regulator (LDO), wherein the LDO may have an efficiency of more than 90% and a Dropout of less than 200 mV.
In one embodiment, the noise reduction system further comprises a first capacitance and/or a second capacitance; the first end of the first capacitor is connected with the second end of the radio frequency module, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the second end of the audio power amplifier, and the second end of the second capacitor is grounded. In this way, by providing the first capacitor and/or the second capacitor, the power source can be decoupled from the ground and the voltage can be stabilized. Optionally, the first capacitor and/or the second capacitor are ceramic capacitors to improve the performance of decoupling the power supply from ground and stabilizing voltage. In addition, when 217Hz interference in GSM communication is loaded at two ends of the ceramic capacitor, the ceramic capacitor can vibrate at 217Hz frequency, and then the main board is driven to vibrate, and board-level noise is generated. Therefore, according to the technical scheme, 217Hz interference is reduced through the power supply rejection ratio improving module, 217Hz interference at two ends of the ceramic capacitor can be reduced, and plate-level noise is reduced.
In particular, FIG. 2 provides another noise reduction system circuit diagram. As shown in fig. 2, the noise reduction system includes a battery 1, a radio frequency module 2, a power supply rejection ratio improving module 4, an audio power amplifier 5, a first capacitor 8, and a second capacitor 9. The first end of the first capacitor 8 is connected with the second end of the radio frequency module 2, and the second end of the first capacitor 8 is grounded; a first terminal of the second capacitor 9 is connected to the second terminal of the audio power amplifier 5, and a second terminal of the second capacitor 9 is grounded. The first capacitor 8 and the second capacitor 9 are ceramic capacitors, the ceramic capacitors are made by extruding capacitor ceramic (barium titanate titanium oxide) with high dielectric constant into a round tube, a wafer or a disc as a medium and plating silver on the ceramic by a sintering infiltration method to serve as an electrode. When the GSM communication is performed, under the condition of the maximum transmission power, the rf module 2 may transmit a signal at 217Hz, and at this time, the power supply rejection ratio increasing module 4 reduces the 217Hz interference, so that not only the power supply 217Hz interference of the audio power amplifier 5 is reduced, but also the power supply 217Hz interference at the two ends of the first capacitor 8 and the second capacitor 9 is reduced.
In the above embodiments, fig. 2 only schematically shows a circuit diagram of a noise reduction system. In the circuit diagram shown in the above embodiment, only one first capacitor 8 may be provided, only one second capacitor 9 may be provided, and the first capacitor 8 and the second capacitor 9 may also be provided, as shown in fig. 2.
According to the noise reduction system provided by the embodiment, the power supply rejection ratio improving module is arranged, when the GSM communication is performed, the power supply rejection ratio improving module reduces the 217Hz interference of the power supply and supplies power to the audio power amplifier, on one hand, the 217Hz interference of the audio power amplifier is reduced, and then the 'nourishing' sound generated during the GSM communication can be reduced, namely the TDD noise is reduced; on the other hand, the 217Hz interference at two ends of the ceramic capacitor is reduced, the vibration of the corresponding ceramic capacitor is weak, and further the vibration of the mainboard is weak, so that the board-level noise generated in GSM communication is reduced.
In one embodiment, the noise reduction system further includes a switch, where the switch includes a common terminal, a first shunt terminal and a second shunt terminal, the common terminal is connected to the first terminal of the rf module, the first shunt terminal is connected to the first terminal of the power supply rejection ratio improving module, and the second shunt terminal is connected to the second terminal of the power supply rejection ratio improving module. When the radio frequency module works, the public end is connected with the first shunt end; when the radio frequency module does not work, the public end is connected with the second shunt end.
In particular, FIG. 3 provides another noise reduction system circuit diagram. As shown in fig. 3, the noise reduction system includes a battery 1, a radio frequency module 2, a switch 3, a power supply rejection ratio improving module 4, an audio power amplifier 5, a first capacitor 8, and a second capacitor 9. The diverter switch 3 comprises a common terminal 3.0, a first shunt terminal 3.1 and a second shunt terminal 3.2. The common end 3.0 of the change-over switch 3 is connected with the first end of the radio frequency module 2, the first shunt end 3.1 of the change-over switch 3 is connected with the first end of the power supply rejection ratio improving module 4, and the second shunt end 3.2 of the change-over switch 3 is connected with the second end of the power supply rejection ratio improving module 4. When the radio frequency module 2 works, the common end 3.0 of the change-over switch 3 is connected with the first shunt end 3.1, and the radio frequency module 2, the power supply rejection ratio improving module 4, the audio power amplifier 5, the first capacitor 8 and the second capacitor 9 form a closed circuit; when the radio frequency module 2 does not work, the common end 3.0 of the change-over switch 3 is connected with the second shunt end 3.2, the power supply rejection ratio improving module 4 is short-circuited, and the radio frequency module 2, the audio power amplifier 5, the first capacitor 8 and the second capacitor 9 form a closed circuit.
The overcurrent capacity of the change-over switch 3 can meet the requirements of the power supply system. Optionally, the change-over switch 3 is a single-pole double-throw switch.
In the embodiment, by setting the switch, when the radio frequency module works, the radio frequency power amplifier can transmit signals at 217Hz frequency, so that 217Hz interference exists in a power network, at this time, the power supply rejection ratio improving module is switched on through the switch, after the power supply provided by the battery passes through the power supply rejection ratio improving module, the 217Hz interference of the power supply is reduced, and then the power supply is supplied to the audio power amplifier, so that the 217Hz interference of the power supply of the audio power amplifier is reduced, and then the 'nourishing' sound generated during GSM communication can be reduced, namely, the TDD noise is reduced. In addition, 217Hz interference of power supplies at two ends of the ceramic capacitor is also reduced, and the vibration of the corresponding ceramic capacitor is weak, so that the board-level noise generated in GSM communication is reduced. When the radio frequency module does not work, 217Hz interference of a power supply network can not be generated, the power supply rejection ratio improving module is short-circuited through the change-over switch at the moment, and the mobile phone battery directly supplies power to the audio frequency power amplifier, so that unnecessary noise reduction operation is avoided. Therefore, by setting the change-over switch, the TDD noise and the board-level noise can be reduced during GSM communication, and unnecessary noise reduction operation can be avoided. In one embodiment, FIG. 4 provides another noise reduction system circuit diagram. As shown in fig. 4, the noise reduction system includes a battery 1, a radio frequency module 2, a switch 3, a power supply rejection ratio improving module 4, an audio power amplifier 5, a power supply management chip 6, another radio frequency chip 7, a first capacitor 8, a second capacitor 9, a third capacitor 10, and a fourth capacitor 11. The audio power amplifier 5, the power management chip 6 and other radio frequency chips 7 are connected in parallel, that is, the first end of the audio power amplifier 5, the first end of the power management chip 6 and the first ends of the other radio frequency chips 7 are connected, the second end of the audio power amplifier 5, the second end of the power management chip 6 and the second ends of the other radio frequency chips 7 are connected, the first end of the third capacitor 10 is connected with the second end of the power management chip 6, the second end of the third capacitor 10 is grounded, the first end of the fourth capacitor 11 is connected with the second ends of the other radio frequency chips 7, and the second end of the fourth capacitor 11 is grounded. Other rf chips 7 may include a backlight driving chip, a flash chip, and the like. Optionally, the third capacitor 10 and the fourth capacitor 11 are both ceramic capacitors. Therefore, by adopting the technical scheme of the application, the TDD noise and the board level noise can be reduced during GSM communication.
In any of the above embodiments, the power supply rejection ratio of the power supply rejection ratio improving module is greater than 60dB, so that the noise reduction effect of the noise reduction system is improved.
In one embodiment, a mobile device is provided that includes a noise reduction system provided by embodiments of the present application. The mobile device can be various personal computers, notebook computers, smart phones, tablet computers, portable wearable devices and the like.
The mobile device provided by the embodiment comprises the noise reduction system provided by the embodiment, and has corresponding functions and beneficial effects.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A noise reduction system is characterized by comprising a battery, a radio frequency module, a power supply rejection ratio improving module and an audio power amplifier; the positive electrode of the battery is connected with the first end of the radio frequency module and the first end of the power supply rejection ratio improving module, the second end of the power supply rejection ratio improving module is connected with the first end of the audio power amplifier, and the second end of the radio frequency module and the second end of the audio power amplifier are both connected with the negative electrode of the battery; wherein the power supply rejection ratio improving module is configured to improve the power supply rejection ratio of the battery.
2. The noise reduction system of claim 1, further comprising a first capacitance and/or a second capacitance; the first end of the first capacitor is connected with the second end of the radio frequency module, the second end of the first capacitor is grounded, the first end of the second capacitor is connected with the second end of the audio power amplifier, and the second end of the second capacitor is grounded.
3. The noise reduction system of claim 2, wherein the first capacitance and/or the second capacitance is a ceramic capacitance.
4. The noise reduction system according to any one of claims 1 to 3, further comprising a switch, wherein the switch comprises a common terminal, a first shunt terminal and a second shunt terminal, the common terminal is connected to the first terminal of the RF module, the first shunt terminal is connected to the first terminal of the power supply rejection ratio improving module, and the second shunt terminal is connected to the second terminal of the power supply rejection ratio improving module.
5. The noise reduction system of claim 4, wherein the common terminal is coupled to the first shunt terminal when the radio frequency module is in operation; and when the radio frequency module does not work, the public end is connected with the second shunt end.
6. The noise reduction system of claim 4, wherein the diverter switch is a single pole double throw switch.
7. The noise reduction system of claim 1, wherein the power supply rejection ratio improvement module has a power supply rejection ratio greater than 60 dB.
8. A mobile device, characterized in that it comprises a noise reduction system according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122371224.1U CN215990916U (en) | 2021-09-27 | 2021-09-27 | Noise reduction system and mobile device |
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| CN202122371224.1U CN215990916U (en) | 2021-09-27 | 2021-09-27 | Noise reduction system and mobile device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116634541A (en) * | 2023-07-19 | 2023-08-22 | 荣耀终端有限公司 | A kind of power supply circuit, power supply method and electronic equipment |
| CN116668922A (en) * | 2023-07-25 | 2023-08-29 | 荣耀终端有限公司 | Electronic equipment |
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2021
- 2021-09-27 CN CN202122371224.1U patent/CN215990916U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116634541A (en) * | 2023-07-19 | 2023-08-22 | 荣耀终端有限公司 | A kind of power supply circuit, power supply method and electronic equipment |
| CN116634541B (en) * | 2023-07-19 | 2023-11-07 | 荣耀终端有限公司 | A power supply circuit, power supply method and electronic equipment |
| CN116668922A (en) * | 2023-07-25 | 2023-08-29 | 荣耀终端有限公司 | Electronic equipment |
| CN116668922B (en) * | 2023-07-25 | 2023-12-19 | 荣耀终端有限公司 | Electronic equipment |
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