Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor

A technology for filtering circuits and harmonic signals, applied in electrical components, transmission systems, etc., to solve problems such as less than ideal harmonic suppression

Inactive Publication Date: 2010-07-28
SHANGHAI WINGTECH ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above countermeasures are adopted, the suppression of harmonics is still not ideal, and there are still areas for improvement

Method used

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  • Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor
  • Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor
  • Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor

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Embodiment Construction

[0019] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] see figure 1 , figure 1 It is the filter circuit diagram of the present invention, which is connected to the output line of the radio frequency power amplifier of the mobile terminal, and the filter circuit includes grounding capacitors C1 and C2 respectively connected to the output line, and also includes a band rejection filter, The band-stop filter includes an inductor L2 and a capacitor C3 connected in parallel, which are connected in series between the grounded capacitors C1 and C2. The inductor L2 is an adjustable inductor, and the capacitor C3 is an adjustable capacitor, which can suppress harmonic signals by adjusting their resonance frequency parameters. By adjusting the resonant frequency parameters of the inductor L2 and the capacitor C3, it can not only realize the passage of useful signals without attenua...

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Abstract

The invention discloses a filter circuit for inhibiting a harmonic signal of a mobile terminal and a method therefor, wherein the filter circuit is arranged on an output line of an RF power amplifier of the mobile terminal for inhibiting the harmonic signal. Firstly, ground capacitors C1 and C2 are connected on the output line of the RF power amplifier of the mobile terminal, then an inductor L2 and a capacitor C3 are connected in parallel to form a band stop filter, and finally the band stop filter is connected between the ground capacitors C1 and C2 in series. As the inductor L2 and the capacitor C3 are both adjustable, the resonant frequency parameters of the inductor L2 and the capacitor C3 are adjusted, so as to not only achieve unattenuated passing through of the useful signal, but also have targeted inhibition for a signal at secondary harmonic frequency point, therefore, the good effect is obtained.

Description

technical field [0001] The invention relates to the field of mobile terminals, in particular to a filter circuit and method for suppressing harmonic signals of a mobile terminal. Background technique [0002] With the development of mobile communication technology, its terminal products have been used by thousands of users. GSM (Global System for Mobile Communications) mobile phone is one of them, and it also brings some EMC (Electromagnetic Compatibility) problems while transmitting power. There are strict requirements both internationally and domestically, including requirements for conduction harassment. [0003] In the transmission path of the mobile terminal, conducted disturbance is caused by the harmonics generated when the RF power amplifier amplifies a small signal of useful frequency into a large signal and outputs it. refer to figure 1 , in the single-chip GSM solution of PNX4901, the integrated module SKY77518 of RF power amplifier (power amplifier) ​​and ante...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H04B1/52
Inventor 彭强
Owner SHANGHAI WINGTECH ELECTRONICS TECH
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