CN105227153A - A kind of low-pass filter circuit - Google Patents
A kind of low-pass filter circuit Download PDFInfo
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- CN105227153A CN105227153A CN201510548033.4A CN201510548033A CN105227153A CN 105227153 A CN105227153 A CN 105227153A CN 201510548033 A CN201510548033 A CN 201510548033A CN 105227153 A CN105227153 A CN 105227153A
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- low
- filter circuit
- pass filter
- inductance
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Abstract
The invention discloses a kind of low-pass filter circuit, this circuit structure is realized by inductance, electric capacity and series resonance unit.This Novel low pass wave filter circuit can be widely used in WCDMA power of mobile communication amplifier, radar antenna etc. to the strict place of signal performance requirement.Can inhibition zone external noise, improve the stability of electronic circuit.Meanwhile, compare the low-pass filter circuit of other structures, the present invention can realize a kind of low-pass filtering, and can apply in communication system.
Description
Technical field
The present invention relates to filter circuit, particularly a kind of low-pass filter circuit, in filtering and matching network, there is important application.
Background technology
In the last few years, a series of research about filter circuit had been carried out both at home and abroad.Achieve a lot of achievement in research, be especially used in mobile communication technology, be used in power-amplifier front-end and radar antenna feed part, filter circuit effectively can solve the large problem of system passband external noise.But its project organization can only use in specific frequency range, and bandwidth is less, make system bulk comparatively large, and versatility is not strong.Simultaneously traditional low-pass filter circuit is due to the problem of its circuit structure, and make temperature sensitivity extremely strong, applicability is very limited.The present invention is directed to above problem, can effectively solve, to meet system requirements, and system is had, and stability is high, volume is little, processing is simple, applied widely.
Summary of the invention
The invention provides and a kind of there is the low-pass filter circuit that structure is simple, volume is little, stability is high.
The technical scheme realizing the object of the invention is: a kind of low-pass filter circuit, and this circuit structure is realized by inductance, electric capacity and series resonance unit.Wherein, port one (Port1) is connected with node 1; Port 2 (Port2) is connected with node 5; One end of inductance L 4 is connected with node 1, and the other end is connected with node 2; One end of inductance L 5 is connected with node 2, and the other end is connected with node 3; One end of inductance L 6 is connected with node 3, and the other end is connected with node 4; One end of inductance L 7 is connected with node 4, and the other end is connected with node 5; One end of electric capacity C4 is connected with node 1, and the other end is connected to the ground and connects; One end of L1C1 series resonance unit is connected with node 2, and the other end is connected to the ground and connects; One end of L2C2 series resonance unit is connected with node 3, and the other end is connected to the ground and connects; One end of L3C3 series resonance unit is connected with node 4, and the other end is connected to the ground and connects; One end of electric capacity C5 is connected with node 5, and the other end is connected to the ground and connects; 50 Ohmic resistances are connect in port one (Port1), port 2 (Port2) are equal.
Compared with prior art, the invention provides a kind of low pass, structure be simple, volume is little, feature that stability is high.
Accompanying drawing explanation
Fig. 1 is a kind of low-pass filter circuit of the present invention.
Fig. 2 is a kind of low-pass filter circuit S parameter of the present invention amplitude-frequency response.
Fig. 3 is a kind of low-pass filter circuit S parameter of the present invention phase response.
Fig. 4 is the response of a kind of low-pass filter circuit S parameter of the present invention group delay.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1, the present invention is a kind of low-pass filter circuit, and this circuit structure is realized by inductance, electric capacity and series resonance unit.Wherein, port one (Port1) is connected with node 1; Port 2 (Port2) is connected with node 5; One end of inductance L 4 is connected with node 1, and the other end is connected with node 2; One end of inductance L 5 is connected with node 2, and the other end is connected with node 3; One end of inductance L 6 is connected with node 3, and the other end is connected with node 4; One end of inductance L 7 is connected with node 4, and the other end is connected with node 5; One end of electric capacity C4 is connected with node 1, and the other end is connected to the ground and connects; One end of L1C1 series resonance unit is connected with node 2, and the other end is connected to the ground and connects; One end of L2C2 series resonance unit is connected with node 3, and the other end is connected to the ground and connects; One end of L3C3 series resonance unit is connected with node 4, and the other end is connected to the ground and connects; One end of electric capacity C5 is connected with node 5, and the other end is connected to the ground and connects; 50 Ohmic resistances are connect in port one (Port1), port 2 (Port2) are equal.
Composition graphs 2, Fig. 3 and Fig. 4, can be found out by its simulation result, this low-pass filter circuit can effectively realize a kind of low-pass filtering, and designed this kind of ultra broadband low pass filter can be used in certain pulse multichannel receiver, through the modulation and demodulation of FSK, Output rusults is good.Result is used to show that this device has good degree of suppression to channel receiver modulating pulse and noise level, effectively overcome and adopt the problem that in traditional design process, design procedure is too complicated, volume is excessive, can ensure that device obtains best channel signal transmission effect.
Claims (1)
1. a low-pass filter circuit, is characterized in that: this circuit structure is realized by inductance, electric capacity and series resonance unit.Wherein, port one (Port1) is connected with node 1; Port 2 (Port2) is connected with node 5; One end of inductance L 4 is connected with node 1, and the other end is connected with node 2; One end of inductance L 5 is connected with node 2, and the other end is connected with node 3; One end of inductance L 6 is connected with node 3, and the other end is connected with node 4; One end of inductance L 7 is connected with node 4, and the other end is connected with node 5; One end of electric capacity C4 is connected with node 1, and the other end is connected to the ground and connects; One end of L1C1 series resonance unit is connected with node 2, and the other end is connected to the ground and connects; One end of L2C2 series resonance unit is connected with node 3, and the other end is connected to the ground and connects; One end of L3C3 series resonance unit is connected with node 4, and the other end is connected to the ground and connects; One end of electric capacity C5 is connected with node 5, and the other end is connected to the ground and connects; 50 Ohmic resistances are connect in port one (Port1), port 2 (Port2) are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510548033.4A CN105227153A (en) | 2015-09-01 | 2015-09-01 | A kind of low-pass filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510548033.4A CN105227153A (en) | 2015-09-01 | 2015-09-01 | A kind of low-pass filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105227153A true CN105227153A (en) | 2016-01-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510548033.4A Pending CN105227153A (en) | 2015-09-01 | 2015-09-01 | A kind of low-pass filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105227153A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110050363A1 (en) * | 2006-11-27 | 2011-03-03 | Thomson Licensing | Active low pass filter |
| CN201869174U (en) * | 2010-11-02 | 2011-06-15 | 北京七星华创电子股份有限公司 | LC low-pass filter |
| CN103338017A (en) * | 2013-06-06 | 2013-10-02 | 中国科学院上海微系统与信息技术研究所 | Lumped-parameter wideband 180-degree coupler with harmonic suppression function |
-
2015
- 2015-09-01 CN CN201510548033.4A patent/CN105227153A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110050363A1 (en) * | 2006-11-27 | 2011-03-03 | Thomson Licensing | Active low pass filter |
| CN201869174U (en) * | 2010-11-02 | 2011-06-15 | 北京七星华创电子股份有限公司 | LC low-pass filter |
| CN103338017A (en) * | 2013-06-06 | 2013-10-02 | 中国科学院上海微系统与信息技术研究所 | Lumped-parameter wideband 180-degree coupler with harmonic suppression function |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160106 |