CN101789796A - Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor - Google Patents
Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor Download PDFInfo
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- CN101789796A CN101789796A CN200910056194A CN200910056194A CN101789796A CN 101789796 A CN101789796 A CN 101789796A CN 200910056194 A CN200910056194 A CN 200910056194A CN 200910056194 A CN200910056194 A CN 200910056194A CN 101789796 A CN101789796 A CN 101789796A
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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
The present invention relates to field of mobile terminals, particularly a kind of filter circuit and method that suppresses the portable terminal harmonic signal.
Background technology
Mobile communication technology develops into now, and its end product is used by thousands of user.GSM (global system for mobile communications) mobile phone promptly is wherein a kind of, and it also brings the problem of some EMC (electromagnetic compatibility) in transmitting power.International and the domestic requirement that all this is had strictness has wherein just comprised the requirement to conduction interference.
In the transmission path of portable terminal, conduction interference is the small-signal of useful frequency to be zoomed into large-signal and the harmonic wave that produces when exporting causes by radio-frequency power amplifier.With reference to Fig. 1, in the GSM of this single-chip of PNX4901 solution, radio-frequency power amplifier (power amplifier) and the integrated module SKY77518 of duplexer have been adopted, the PNX4901 chip internal is integrated transceiver, after the signal demand of its transmitter emission carries out power amplification via the external radio frequency amplifier, go out by aerial radiation again, communicate with the base station.The small-signal of transceiver transfers out via radio-frequency power amplifier SKY77518 amplification again, is just carrying the multiple harmonic signal in this large-signal.Referring to Fig. 2, the straight line among Fig. 2 in the coordinates regional is the limit value of conduction interference, with reference to diagram and through measuring and calculating, has exceeded limit value 2.87dB in the signal amplitude of this frequency of 3495.495MHz.
At above situation, the countermeasure of taking is the circuit that adds ∏ type structure on the outlet line of the radio-frequency power amplifier of mobile phone, is used for the impedance matching of transmission line and the inhibition of harmonic wave.The circuit of ∏ type structure is by capacitor C 1 and the C2 of 2 1pF over the ground, and 3.9nH inductance L 1 composition of a series connection, and they both can do the impedance matching of transmission line, also can doublely make a filter simultaneously, in order to the filtering multiple harmonic.
Although adopt above countermeasure, still be not ideal for the inhibition of harmonic wave, still there is the improved place of needs.
Summary of the invention
The purpose of this invention is to provide a kind of filter circuit and method that suppresses the portable terminal harmonic signal, realize inhibition the harmonic signal of portable terminal transmission path generation.
The invention provides a kind of filter circuit that suppresses the portable terminal harmonic signal, it is connected on the outlet line of described mobile terminal radio frequency power amplifier, described filter circuit comprises ground capacity C1 and the C2 that is connected on the described outlet line, also comprise a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.
Described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3.
Described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor.
On the other hand, the present invention also provides a kind of method that suppresses the portable terminal harmonic signal, may further comprise the steps:
4.1, prepare capacitor C 1 and C2, and respectively with the end ground connection of capacitor C 1 and C2;
4.2, the other end with the capacitor C after the ground connection 1, C2 is connected on the outlet line of described mobile terminal radio frequency power amplifier respectively;
4.3, prepare a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.
Described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3.
Described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor.
Adopt a kind of filter circuit and method that suppresses the portable terminal harmonic signal of the present invention, it is by being provided with the inhibition that filter circuit carries out harmonic signal on the outlet line of mobile terminal radio frequency power amplifier.At first ground capacity C1, C2 are connected on the outlet line of described mobile terminal radio frequency power amplifier, then inductance L 2 and capacitor C 3 are composed in parallel a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.Because inductance L 2 and capacitor C 3 all are adjustable, so adjust the resonance frequency parameter of inductance L 2 and capacitor C 3, can realize that useful signal is zero-decrement passes through, and can the signal of 2 subharmonic frequencies be suppressed targetedly again, has obtained good effect.
Description of drawings
Fig. 1 is filter circuit figure of the present invention;
The 2 subharmonic figure that Fig. 2 is to use 698 channels of DCS1800 frequency range behind the present invention to show.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
Referring to Fig. 1, Fig. 1 is filter circuit figure of the present invention, it is connected on the outlet line of described mobile terminal radio frequency power amplifier, described filter circuit comprises ground capacity C1 and the C2 that is connected on the described outlet line, also comprise a band stop filter, described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3, and it is connected between described ground capacity C1 and the C2.Described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor, can carry out the inhibition of harmonic signal by the resonance frequency parameter of adjusting them.By adjusting the resonance frequency parameter of inductance L 2 and capacitor C 3, can realize that useful signal is zero-decrement passes through, and can the signal of 2 subharmonic frequencies be suppressed targetedly again, has obtained good effect.As an embodiment, the value of above components and parts is: C1=1.0pF, C2=1.0pF, C3=0.5pF, L2=3.3nH.
Referring to Fig. 2, as can be seen from Figure 2, adopted harmonic circuit of the present invention after, the harmonic signal energy reduces more, 2 subharmonic point has the surplus (-40 to-30 scopes on the ordinate) of nearly 10dB.
On the other hand, the present invention also provides a kind of method that suppresses the portable terminal harmonic signal, may further comprise the steps:
4.1, prepare capacitor C 1 and C2, and respectively with the end ground connection of capacitor C 1 and C2;
4.2, the other end with the capacitor C after the ground connection 1, C2 is connected on the outlet line of described mobile terminal radio frequency power amplifier respectively;
4.3, prepare a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.As an embodiment, described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3, and described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor.
It is pointed out that a kind of filter circuit that suppresses the portable terminal harmonic signal of the present invention is identical or similar in principle with specifically implementing with a kind of method that suppresses the portable terminal harmonic signal of the present invention.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (6)
1. filter circuit that suppresses the portable terminal harmonic signal, it is connected on the outlet line of described mobile terminal radio frequency power amplifier, described filter circuit comprises ground capacity C1 and the C2 that is connected on the described outlet line, it is characterized in that, also comprise a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.
2. filter circuit as claimed in claim 1 is characterized in that, described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3.
3. filter circuit as claimed in claim 2 is characterized in that, described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor.
4. a method that suppresses the portable terminal harmonic signal is characterized in that, may further comprise the steps:
4.1, prepare capacitor C 1 and C2, and respectively with the end ground connection of capacitor C 1 and C2;
4.2, the other end with the capacitor C after the ground connection 1, C2 is connected on the outlet line of described mobile terminal radio frequency power amplifier respectively;
4.3, prepare a band stop filter, described band stop filter is connected between described ground capacity C1 and the C2.
5. method as claimed in claim 4 is characterized in that, described band stop filter comprises inductance L parallel with one another 2 and capacitor C 3.
6. method as claimed in claim 5 is characterized in that, described inductance L 2 is a controllable impedance, and described capacitor C 3 is a tunable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056194A CN101789796A (en) | 2009-08-10 | 2009-08-10 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910056194A CN101789796A (en) | 2009-08-10 | 2009-08-10 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
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| CN101789796A true CN101789796A (en) | 2010-07-28 |
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| CN200910056194A Pending CN101789796A (en) | 2009-08-10 | 2009-08-10 | Filter circuit for inhibiting harmonic signal of mobile terminal and method therefor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227616A (en) * | 2013-01-30 | 2013-07-31 | 王少夫 | Method for implementing bandstop filter with tunable bridge |
| CN103606724A (en) * | 2013-11-25 | 2014-02-26 | 海能达通信股份有限公司 | Power device and micro-strip filter thereof |
| CN104811217A (en) * | 2014-01-29 | 2015-07-29 | 株式会社东芝 | Semiconductor device, and transmission and reception circuit |
| CN105680898A (en) * | 2016-01-08 | 2016-06-15 | 上海斐讯数据通信技术有限公司 | Circuit for perfecting performance of mobile terminal |
| CN106100652A (en) * | 2016-05-31 | 2016-11-09 | 广东欧珀移动通信有限公司 | Mixed-dispel suppression device and method |
| CN109510604A (en) * | 2018-11-13 | 2019-03-22 | 上海艾为电子技术股份有限公司 | A kind of filter circuit applied to radio-frequency front-end |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
| WO2020119538A1 (en) * | 2018-12-10 | 2020-06-18 | 维沃移动通信有限公司 | Antenna system and mobile terminal |
| CN111864411A (en) * | 2019-04-30 | 2020-10-30 | 北京小米移动软件有限公司 | Antenna module, terminal, control method, control device and storage medium |
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| US20040246074A1 (en) * | 2003-02-20 | 2004-12-09 | Tdk Corporation | Multi-mode filter |
| CN2665948Y (en) * | 2003-09-25 | 2004-12-22 | 台塑讯科股份有限公司 | Pi band-pass filter |
| CN101257316A (en) * | 2007-01-25 | 2008-09-03 | 捷讯研究有限公司 | System and method for controlling radio frequency transmissions in an electronic device |
| CN201222728Y (en) * | 2008-07-10 | 2009-04-15 | 南京广顺网络通信设备有限公司 | Microstrip dual-frequency antenna mixer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040246074A1 (en) * | 2003-02-20 | 2004-12-09 | Tdk Corporation | Multi-mode filter |
| CN2665948Y (en) * | 2003-09-25 | 2004-12-22 | 台塑讯科股份有限公司 | Pi band-pass filter |
| CN101257316A (en) * | 2007-01-25 | 2008-09-03 | 捷讯研究有限公司 | System and method for controlling radio frequency transmissions in an electronic device |
| CN201222728Y (en) * | 2008-07-10 | 2009-04-15 | 南京广顺网络通信设备有限公司 | Microstrip dual-frequency antenna mixer |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227616A (en) * | 2013-01-30 | 2013-07-31 | 王少夫 | Method for implementing bandstop filter with tunable bridge |
| CN103606724A (en) * | 2013-11-25 | 2014-02-26 | 海能达通信股份有限公司 | Power device and micro-strip filter thereof |
| CN104811217A (en) * | 2014-01-29 | 2015-07-29 | 株式会社东芝 | Semiconductor device, and transmission and reception circuit |
| CN105680898A (en) * | 2016-01-08 | 2016-06-15 | 上海斐讯数据通信技术有限公司 | Circuit for perfecting performance of mobile terminal |
| CN106100652A (en) * | 2016-05-31 | 2016-11-09 | 广东欧珀移动通信有限公司 | Mixed-dispel suppression device and method |
| CN106100652B (en) * | 2016-05-31 | 2018-11-27 | 广东欧珀移动通信有限公司 | Mixed-dispel suppression device and method |
| CN109510604A (en) * | 2018-11-13 | 2019-03-22 | 上海艾为电子技术股份有限公司 | A kind of filter circuit applied to radio-frequency front-end |
| CN109510604B (en) * | 2018-11-13 | 2023-10-13 | 上海艾为电子技术股份有限公司 | Filter circuit applied to radio frequency front end |
| WO2020119538A1 (en) * | 2018-12-10 | 2020-06-18 | 维沃移动通信有限公司 | Antenna system and mobile terminal |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
| CN109639253B (en) * | 2018-12-13 | 2023-03-07 | 广州海格通信集团股份有限公司 | Inductor-reusable miniaturized harmonic filter |
| CN111864411A (en) * | 2019-04-30 | 2020-10-30 | 北京小米移动软件有限公司 | Antenna module, terminal, control method, control device and storage medium |
| US11671126B2 (en) | 2019-04-30 | 2023-06-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Antenna module, terminal, control method and device and storage medium |
| US11671127B2 (en) | 2019-04-30 | 2023-06-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Antenna module, terminal, control method and device and storage medium |
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Application publication date: 20100728 |