CN204206123U - A kind of chain type low-pass filter circuit - Google Patents
A kind of chain type low-pass filter circuit Download PDFInfo
- Publication number
- CN204206123U CN204206123U CN201420424771.9U CN201420424771U CN204206123U CN 204206123 U CN204206123 U CN 204206123U CN 201420424771 U CN201420424771 U CN 201420424771U CN 204206123 U CN204206123 U CN 204206123U
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- CN
- China
- Prior art keywords
- chain type
- inductance
- pass filter
- type low
- electric capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a kind of chain type low-pass filter circuit, this circuit structure is realized by inductance, electric capacity.Mainly utilize Bart to irrigate the most smooth amplitude-frequency characteristic of husband and the Out-of-band rejection characteristic of Chebyshev's the best, chain type low pass filter is that Bart irrigates the compromise of husband and Qie Fuxuefu, under same exponent number, produces different responses.Effectively overcome the compatibling problem of the most smooth amplitude-frequency characteristic of design of filter and best Out-of-band rejection characteristic, can ensure that passive filter obtains best filter effect.The important application of chain type function is exactly erect bridge between the most smooth amplitude-frequency characteristic of Butterworth function and the high out-of-side rejection characteristic of traditional chebyshev approximation.The utility model 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.
Description
Technical field
The utility model belongs to communication and electronic application field, particularly in filtering and matching network, has 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, cannot overcome the compatibling problem of the most smooth amplitude-frequency characteristic of design of filter and best Out-of-band rejection characteristic, applicability is very limited.The utility model, for above problem, can effectively solve, and to meet system requirements, and stability is high, volume is little, processing is simple, applied widely.
Utility model content
The utility model provides the chain type low-pass filter circuit that a kind of structure is simple, volume is little, stability is high.
The technical scheme realizing the utility model object is: a kind of chain type low-pass filter circuit, comprises resistance R1, R2, inductance L 1, L2, L3, and electric capacity C1, C2 realize; Resistance R1 one end is connected with power positive end, and the other end is connected with inductance L 1; The other end of inductance L 1 and electric capacity C1, one end of inductance L 2 is connected; The other end of electric capacity C1 is connected with power supply negative terminal; The other end of inductance L 2 and electric capacity C2, one end of inductance L 3 is connected; The other end of electric capacity C2 is connected with power supply negative terminal; The other end of inductance L 3 is connected with resistance R2; The other end of resistance R2 is connected with power supply negative terminal.
Compared with prior art, the utility model provides the feature that a kind of structure is simple, multiband, volume are little, stability is high.
Accompanying drawing explanation
Fig. 1 is a kind of chain type low-pass filter circuit of the utility model.
Fig. 2 is a kind of chain type low-pass filter circuit of the utility model S parameter characteristic curve.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Composition graphs 1, the utility model is a kind of chain type low-pass filter circuit, comprises resistance R1, R2, inductance L 1, L2, L3, and electric capacity C1, C2 realize; Resistance R1 one end is connected with power positive end, and the other end is connected with inductance L 1; The other end of inductance L 1 and electric capacity C1, one end of inductance L 2 is connected; The other end of electric capacity C1 is connected with power supply negative terminal; The other end of inductance L 2 and electric capacity C2, one end of inductance L 3 is connected; The other end of electric capacity C2 is connected with power supply negative terminal; The other end of inductance L 3 is connected with resistance R2; The other end of resistance R2 is connected with power supply negative terminal.When component value is L1=1.45H, C1=1.67F, R1=R2=1
, L2=1.56H, C2=1.19F, L3=0.45H, its S parameter characteristic curve as shown in Figure 2.
As apparent from Fig. 2 can, from Butterworth to chebyshev function, can provide different chain type parameters go select.
For same exponent number, passband ripple, bandwidth, there is different responses.This filter oneself be used successfully in certain pulse 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 receiver modulating pulse and noise level.The key property of chain function is low cost, high-performance, can carry out different application with exponent number function.
Iterated electrical filter erects bridge between the most smooth amplitude-frequency characteristic of Butterworth function and the high out-of-side rejection characteristic of traditional chebyshev approximation.
Claims (1)
1. a chain type low-pass filter circuit, is characterized in that: comprise resistance R
1, R
2, inductance L
1, L
2, L
3; Electric capacity C
1, C
2realize; Resistance R
1one end is connected with power positive end, the other end and inductance L
1be connected; Inductance L
1the other end respectively with electric capacity C
1, inductance L
2one end be connected; Electric capacity C
1the other end be connected with power supply negative terminal; Inductance L
2the other end respectively with electric capacity C
2, inductance L
3one end be connected; Electric capacity C
2the other end be connected with power supply negative terminal; Inductance L
3the other end and resistance R
2be connected; Resistance R
2the other end be connected with power supply negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424771.9U CN204206123U (en) | 2014-07-31 | 2014-07-31 | A kind of chain type low-pass filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424771.9U CN204206123U (en) | 2014-07-31 | 2014-07-31 | A kind of chain type low-pass filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204206123U true CN204206123U (en) | 2015-03-11 |
Family
ID=52664034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420424771.9U Expired - Fee Related CN204206123U (en) | 2014-07-31 | 2014-07-31 | A kind of chain type low-pass filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204206123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092444A (en) * | 2014-07-31 | 2014-10-08 | 王少夫 | Chained low-pass filtering circuit |
| CN106209018A (en) * | 2016-08-01 | 2016-12-07 | 合肥佳瑞林电子技术有限公司 | A kind of high-power band filter of ground radar |
-
2014
- 2014-07-31 CN CN201420424771.9U patent/CN204206123U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092444A (en) * | 2014-07-31 | 2014-10-08 | 王少夫 | Chained low-pass filtering circuit |
| CN106209018A (en) * | 2016-08-01 | 2016-12-07 | 合肥佳瑞林电子技术有限公司 | A kind of high-power band filter of ground radar |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150311 Termination date: 20150731 |
|
| EXPY | Termination of patent right or utility model |