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Radio frequency circuit and mobile terminal

A radio frequency circuit and antenna circuit technology, applied in electrical components, transmission systems, etc., can solve the problems of SAR exceeding the standard, radiation stray exceeding the standard, and antenna influence.

Active Publication Date: 2016-12-07
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a radio frequency circuit and a mobile terminal to solve the problem that the existing antenna form is affected by the hardware, it is difficult to modify and debug, and it is easy to cause problems such as excessive radiation and SAR during debugging.

Method used

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  • Radio frequency circuit and mobile terminal

Examples

Experimental program
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Effect test

no. 1 example

[0024] Such as figure 2 As shown, the radio frequency circuit of the first embodiment of the present invention includes:

[0025] radio frequency transceiver 10;

[0026] An antenna circuit 20 connected to the first end of the radio frequency transceiver 10;

[0027] Antenna 30;

[0028] A negative feedback circuit 40, the first end of the negative feedback circuit 40 is connected to the second end of the radio frequency transceiver 10, the second end is connected to the antenna circuit 20, and the third end is connected to the antenna 30, for The radiation power in the antenna circuit 20 is fed back to the radio frequency transceiver 10, so that the radio frequency transceiver 10 adjusts the transmission power of a signal according to the radiation power.

[0029] It should be noted that the first end of the radio frequency transceiver 10 is a transmitting end, and the second end of the radio frequency transceiver 10 is a receiving end.

[0030] It should be noted that t...

no. 2 example

[0063] The second embodiment of the present invention provides a mobile terminal, including the above radio frequency circuit.

[0064] It should be noted that the mobile terminal equipped with the above-mentioned radio frequency circuit can adjust the transmission power of the antenna by detecting the power, and can adjust the transmission power setting for the corresponding frequency band without affecting the final transmission power of other frequency bands. The fine-tuning does not affect the test and improves the user experience.

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Abstract

The invention provides a radio frequency circuit and a mobile terminal, and relates to the field of mobile terminals. The radio frequency circuit comprises a radio frequency transceiver, an antenna circuit, an antenna and a negative feedback circuit, wherein the antenna circuit is connected with the first end of the radio frequency transceiver; the first end of the negative feedback circuit is connected with the second end of the radio frequency transceiver; the second end of the negative feedback circuit is connected with the antenna circuit; the third end of the negative feedback circuit is connected with the antenna; and the negative feedback circuit is used for feeding back radiation power in the antenna circuit to the radio frequency transceiver, so that the radio frequency transceiver can adjust the sending power of a signal according to the radiation power. Therefore, fine adjustment of signal sending power is realized, and requirements of tests are met.

Description

technical field [0001] The invention relates to the technical field of mobile terminals, in particular to a radio frequency circuit and a mobile terminal. Background technique [0002] With the increasing development of mobile terminal equipment, the antenna environment is getting worse and worse. In order to meet the requirements of antenna radiation testing, such as total radiated power (TRP) testing, electromagnetic wave absorption ratio or specific absorption rate (Specific Absorption Rate, SAR ) test, etc., need to expend a lot of energy on the evaluation and debugging of the antenna. In some cases, it is even necessary to appropriately reduce the transmission power to meet the radiation test requirements under the premise of meeting the standards. [0003] Conventional mobile terminal RF front-end circuits such as figure 1 As shown, the radio frequency transceiver 1 is connected to a power amplifier (Power Amplifier, PA) 2, the PA is connected to a switch 3, the swit...

Claims

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Application Information

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IPC IPC(8): H04B1/40
CPCH04B1/40
Inventor 张厦侯梓鹏
Owner VIVO MOBILE COMM CO LTD
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