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Circuit board for low-noise mobile phone and method for reducing noise of mobile phone system

A mobile phone system and circuit board technology, used in two-way sound reinforcement phone systems, transmission systems, electrical components, etc., can solve the problems of mobile phone system circuit noise, mobile phone audio signal interference, ground loop noise, etc., and achieve strong anti-interference ability. , the effect of reducing noise

Inactive Publication Date: 2012-02-01
SHANGHAI WINGTECH ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Interference noise introduced by the power supply part
[0006] The generated peak pulses, surge currents, and ripple voltages of different frequencies will seriously interfere with the audio signal of the mobile phone
[0007] 3. Ground loop noise
[0008] 4. Circuit noise inside the mobile phone system

Method used

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  • Circuit board for low-noise mobile phone and method for reducing noise of mobile phone system
  • Circuit board for low-noise mobile phone and method for reducing noise of mobile phone system
  • Circuit board for low-noise mobile phone and method for reducing noise of mobile phone system

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Embodiment Construction

[0025] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] In order to effectively reduce noise, in the layout planning of the mobile phone circuit board, try to isolate the audio module and the radio frequency module of the mobile phone circuit board to minimize the interference, because the high-power transmission signal of the radio frequency module will cause The audio module is seriously disturbed, and a good layout can effectively reduce the interference of system noise to the audio system.

[0027] In terms of circuit board wiring, the audio signal lines of the audio module adopt differential routing, and the routing should be parallel and close to each other and protected by ground, and the routing should avoid close to the large signal area, and the audio power supply should be kept clean. If the trace is too long, the audio power amplifier needs to be as close as poss...

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Abstract

The invention discloses a circuit board for a low-noise mobile phone and a method for reducing noise of a mobile phone system. A differential wiring mode is taken as a wiring mode of an audio signal wire of an audio module of the circuit board; the wiring mode is strong in anti-jamming capability; magnetic beads are serially connected to an input end and an output end of the audio module; the magnetic beads are specially used for restraining high-frequency noise and peak interference on a signal wire and a power line, have a capability of absorbing a static pulse and are capable of excellently reducing related noise; the output end of the audio module is connected to a related capacitor; and the capacitor can be used for efficiently filtering noise and restraining coupling interference between the capacitor and the output end.

Description

technical field [0001] The invention relates to the field of mobile phone noise processing, in particular to a low-noise mobile phone circuit board and a method for reducing mobile phone system noise. Background technique [0002] In the development of modern cellular phones, as the integration of mobile phones becomes higher and higher, the functions become more and more powerful, more and more devices are placed on the PCB, and the layout space becomes smaller and smaller, which makes the analog audio signal of the mobile phone more susceptible to noise interference. bigger and bigger. [0003] At present, there are mainly the following types of noise interference in mobile phones: [0004] 1. TDMA noise. The frequency is 217Hz, each time slot of GSM TDMA is 577uS, and each frame has 8 time slots, that is, the length of each frame is 577us×8=4.616ms. GSM is duplex for sending and receiving, that is, as long as it is in the communication state, the transmission frame is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M1/19H04M9/08H04B1/10
Inventor 陈贤能
Owner SHANGHAI WINGTECH ELECTRONICS TECH
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