CN106454190A - Band-pass filter having high out-of-band rejection of broad band - Google Patents
Band-pass filter having high out-of-band rejection of broad band Download PDFInfo
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- CN106454190A CN106454190A CN201610780771.6A CN201610780771A CN106454190A CN 106454190 A CN106454190 A CN 106454190A CN 201610780771 A CN201610780771 A CN 201610780771A CN 106454190 A CN106454190 A CN 106454190A
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- electric capacity
- pass filter
- inductance
- high frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
Abstract
The invention discloses a band-pass filter having high out-of-band rejection of a broad band. The band-pass filter includes a third-order high-pass filter, a third-order low-pass filter, a first high frequency low-pass filter and a second high frequency low-pass filter. The third-order high-pass filter is connected to the third-order low-pass filter through the first high frequency low-pass filter. The third-order low-pass filter is connected to the second high frequency low-pass filter. The third-order high-pass filter has a starting frequency of 110 MHz and a cut-off frequency of 862 MHz. According to the invention, the band-pass filter has high out-of-band rejection, can withstand any strong interference in a wired digital television signal, such as low frequency EOC and upstream strong signals of a Cable modem, MOCA and interference of high frequency EOC, WIFI interference, etc., greatly increases the quality of wired digital television signals, has ingenious circuit design, low cost and excellent potential of application.
Description
Technical field
The present invention relates to signal filtering processing technology field, be specifically related to the bandpass filtering of a kind of broadband high out-of-side rejection
Device.
Background technology
There is various strong interference in Cable Network, such as the up strong letter of low frequency EOC and Cable modem
Number, the interference of MOCA and high frequency E OC, WIFI interference etc., affect the signal quality of cable digital TV, how to design a filtering
Device, suppresses various strong interference, improves signal quality, is current urgent problem.
Content of the invention
It is an object of the invention to overcome in existing Cable Network and there is various strong interference, affect cabled digital
The problem of the signal quality of TV.The bandpass filter of the broadband high out-of-side rejection of the present invention, has high out-of-side rejection, can support
Various strong interference in anti-digital catv signal, such as the up strong signal of low frequency EOC and Cable modem, MOCA and
The interference of high frequency E OC, WIFI interference etc., substantially increase the quality of digital catv signal, circuit design is ingenious, low cost
Honest and clean, have a good application prospect, use on a large scale on company's wired digital set-top box product in front.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of bandpass filter of broadband high out-of-side rejection, it is characterised in that：Including the filtering of three rank high-pass filters, third-order low-pass
Device, the first high frequency low pass filter and the second high frequency low pass filter, described three rank high-pass filters pass through the first high frequency low pass
Wave filter is connected with third-order low-pass filter, and described third-order low-pass filter and the second high frequency low pass filter are connected,
The initial frequency of described three rank high-pass filters is 110MHz, and the cut-off frequency of described third-order low-pass filter is
862MHz.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described three rank high-pass filters, three
Rank low pass filter all uses resonance absorbing formula structure.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described three rank high-pass filter bags
Including the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 being in series, the upper negative pole of an electric capacity is connected with the positive pole of next electric capacity
Connecing, the described positive pole of the first electric capacity C1 and the negative pole of the 4th electric capacity C4 are connected, and the positive pole of described 4th electric capacity C4 passes through first
Inductance L1 is connected to the ground and connects, and the described positive pole of the second electric capacity C2 and the negative pole of the 5th electric capacity C5 are connected, described 5th electric capacity C5
Positive pole be connected to the ground by the second inductance L2 and connect, the positive pole of described 3rd electric capacity C3 leads to the 3rd inductance L3 and is directly connected to the ground
Connecing, the negative pole of described first electric capacity C1 is as the input of three rank high-pass filters, and the positive pole of described 3rd electric capacity C3 is as three
The input of the output of rank high-pass filter and the first high frequency low pass filter is connected.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described first high frequency LPF
Device includes the 4th inductance L4, the 6th electric capacity C6, and one end of described 4th inductance L4 is as the input of the first high frequency low pass filter
End is connected with three rank high-pass filters, and the other end of described 4th inductance L4 is as the output of the first high frequency low pass filter
Being connected with the input of third-order low-pass filter, the other end of described 4th inductance L4 is also connected with the negative pole of the 6th electric capacity C6
Connecing, the positive pole of described 6th electric capacity C6 is connected to the ground and connects.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described third-order low-pass filter bag
Including the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 being in series, the upper negative pole of an electric capacity is connected with the positive pole of next electric capacity
Connect, the 7th electric capacity C7, the 8th electric capacity C8, the two poles of the earth of the 9th electric capacity C9 be parallel with respectively the 5th inductance L5, the 6th inductance L6, the 7th
Inductance L7, described 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 positive pole also respectively with the tenth electric capacity C10, the 11st electricity
Hold C11, the negative pole of the 12nd electric capacity C12 to be connected, described tenth electric capacity C10, the 11st electric capacity C11, the 12nd electric capacity C12
Positive pole is all connected to the ground and connects, and the negative pole of described 7th electric capacity C7 is as the input of third-order low-pass filter and the first high frequency low pass
Wave filter is connected, and the positive pole of described 9th electric capacity C9 is as the output of third-order low-pass filter and the second high frequency LPF
The input of device is connected.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described second high frequency LPF
Device includes the 8th inductance L8, the 13rd electric capacity C13, defeated as the second high frequency low pass filter of one end of described 8th inductance L8
Entering end to be connected with third-order low-pass filter, the other end of described 4th inductance L4 is as the output of the second high frequency low pass filter
End, the other end of described 8th inductance L8 is also connected with the negative pole of the 13rd electric capacity C13, and described 13rd electric capacity C13 is just
Pole is connected to the ground and connects.
The bandpass filter of aforesaid a kind of broadband high out-of-side rejection, it is characterised in that：Described three rank high-pass filters, three
Inductance in rank low pass filter, the first high frequency low pass filter and the second high frequency low pass filter can use tubular wire around electricity
Sense, paster high-frequency line are around inductance or paster high-frequency ceramic inductance.
The invention has the beneficial effects as follows：The bandpass filter of the broadband high out-of-side rejection of the present invention, has high out-of-side rejection,
The various strong interference in digital catv signal can be resisted, such as the up strong signal of low frequency EOC and Cable modem,
MOCA and the interference of high frequency E OC, WIFI interference etc., substantially increase the quality of digital catv signal, circuit design is ingenious,
With low cost, have a good application prospect.
Brief description
Fig. 1 is the circuit theory diagrams of the bandpass filter of the broadband high out-of-side rejection of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is further illustrated.
As it is shown in figure 1, the bandpass filter of the broadband high out-of-side rejection of the present invention, including three rank high-pass filters, three rank
Low pass filter, the first high frequency low pass filter and the second high frequency low pass filter, described three rank high-pass filters pass through first
High frequency low pass filter is connected with third-order low-pass filter, described third-order low-pass filter and the second high frequency low pass filter phase
Connect,
Be less than 65MHz according to low frequency EOC and Cable modem upstream frequency, cable television digital signal at 110-862MHz, and
MOCA, high frequency E OC signalman's working frequency are at more than 970MHz, and WIFI signal is operated near 2.4GHz, the logical filter of the band of the present invention
Ripple device, by frequency at 110-862MHz, is less than the signal of 65MHZ and the signal more than 970MHz is significantly filtered, can be maximum
The reception of the guarantee wire signal of limit, it is to avoid the interference of out of band signal, the initial frequency of described three rank high-pass filters is
110MHz, the cut-off frequency of described third-order low-pass filter is 862MHz, described first high frequency low pass filter and the second high frequency
Low pass filter its play the signal of suppression front end, and play impedance matching effect, concrete inductance parameters can be according to actual need
Carry out selecting to adjust using.
Described three rank high-pass filters, third-order low-pass filter all use resonance absorbing formula structure, are greatly increased wave filter
The steep at edge, simultaneously in order to improve ESD performance, the third level of three rank high-pass filters have employed inductance and is directly grounded place
Reason.
Described three rank high-pass filters include the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 being in series, a upper electricity
The negative pole holding is connected with the positive pole of next electric capacity, and the described positive pole of the first electric capacity C1 and the negative pole of the 4th electric capacity C4 are connected,
The positive pole of described 4th electric capacity C4 is connected to the ground by the first inductance L1 and connects, the positive pole of described second electric capacity C2 and the 5th electric capacity C5
Negative pole be connected, the positive pole of described 5th electric capacity C5 is connected to the ground by the second inductance L2 and connects, and described 3rd electric capacity C3 is just
Extremely lead to the 3rd inductance L3 to be directly connected to the ground and connect, the negative pole of described first electric capacity C1 as the input of three rank high-pass filters,
The output as three rank high-pass filters for the positive pole of described 3rd electric capacity C3 and the input phase of the first high frequency low pass filter
Connect.
Described first high frequency low pass filter includes the 4th inductance L4, the 6th electric capacity C6, one end of described 4th inductance L4
Input and three rank high-pass filters as the first high frequency low pass filter are connected, and the other end of described 4th inductance L4 is made
Being that the output of the first high frequency low pass filter is connected with the input of third-order low-pass filter, described 4th inductance L4's is another
One end is also connected with the negative pole of the 6th electric capacity C6, and the positive pole of described 6th electric capacity C6 is connected to the ground and connects.
Described third-order low-pass filter includes the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 being in series, a upper electricity
The negative pole holding is connected with the positive pole of next electric capacity, the 7th electric capacity C7, the 8th electric capacity C8, the two poles of the earth parallel connection respectively of the 9th electric capacity C9
Have the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, described 7th electric capacity C7, the 8th electric capacity C8, the positive pole of the 9th electric capacity C9
It is connected with the tenth electric capacity C10, the 11st electric capacity C11, the negative pole of the 12nd electric capacity C12 also respectively, described tenth electric capacity C10,
11st electric capacity C11, the positive pole of the 12nd electric capacity C12 are all connected to the ground and connect, and the negative pole of described 7th electric capacity C7 is low as three rank
The input of bandpass filter and the first high frequency low pass filter are connected, and the positive pole of described 9th electric capacity C9 is filtered as third-order low-pass
The input of the output of ripple device and the second high frequency low pass filter is connected.
Described second high frequency low pass filter includes the 8th inductance L8, the 13rd electric capacity C13, the one of described 8th inductance L8
End is connected with third-order low-pass filter as the input of the second high frequency low pass filter, the other end of described 4th inductance L4
As the output of the second high frequency low pass filter, the negative pole also with the 13rd electric capacity C13 for the other end of described 8th inductance L8
Being connected, the positive pole of described 13rd electric capacity C13 is connected to the ground and connects.
It is known that the rejection ability of filter circuit is related with the inductance Q value of employing, Q value is bigger, and insertion loss is less,
Out-of-band rejection is bigger, and Q value is less, then insertion loss becomes big, and Out-of-band rejection is deteriorated, therefore, and described three rank high-pass filters, three rank
Inductance in low pass filter, the first high frequency low pass filter and the second high frequency low pass filter can use tubular wire around inductance,
Paster high-frequency line is around inductance or paster high-frequency ceramic inductance, by the most frequently used paster high-frequency line as a example by inductance, and its 100MHz
When Q value when the 30th, 1GHz about 100, its insertion loss near 110MHz and 862MHz wave filter edge is relatively good, can
Control is within 1 dB, and the following low frequency end of Out-of-band rejection 65MHz is more than 45dB, and more than 970MHz front end is more than 40dB.
In sum, the bandpass filter of the broadband high out-of-side rejection of the present invention, has high out-of-side rejection, can resist
Various strong interference in line digital television signal, such as up strong signal, MOCA and the high frequency of low frequency EOC and Cable modem
The interference of EOC, WIFI interference etc., substantially increase the quality of digital catv signal, circuit design is ingenious, with low cost,
Have a good application prospect.
General principle, principal character and the advantage of the present invention have more than been shown and described.The technical staff of the industry should
Understanding, the present invention is not restricted to the described embodiments, and the simply explanation present invention's described in above-described embodiment and specification is former
Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements
Both fall within scope of the claimed invention.Claimed scope is by appending claims and equivalent circle thereof
Fixed.
Claims (7)
1. the bandpass filter of a broadband high out-of-side rejection, it is characterised in that：Including the filter of three rank high-pass filters, third-order low-pass
Ripple device, the first high frequency low pass filter and the second high frequency low pass filter, described three rank high-pass filters are low by the first high frequency
Bandpass filter is connected with third-order low-pass filter, and described third-order low-pass filter and the second high frequency low pass filter are connected,
The initial frequency of described three rank high-pass filters is 110MHz, and the cut-off frequency of described third-order low-pass filter is
862MHz.
2. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described three rank are high
Bandpass filter, third-order low-pass filter all use resonance absorbing formula structure.
3. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described three rank are high
Bandpass filter includes the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 being in series, the negative pole of a upper electric capacity and next electric capacity
Positive pole be connected, the described positive pole of the first electric capacity C1 and the negative pole of the 4th electric capacity C4 are connected, and described 4th electric capacity C4 is just
Pole is connected to the ground by the first inductance L1 and connects, and the described positive pole of the second electric capacity C2 and the negative pole of the 5th electric capacity C5 are connected, described
The positive pole of the 5th electric capacity C5 is connected to the ground by the second inductance L2 and connects, and it is direct that the positive pole of described 3rd electric capacity C3 leads to the 3rd inductance L3
Being connected to the ground and connecing, the negative pole of described first electric capacity C1 is as the input of three rank high-pass filters, and described 3rd electric capacity C3 is just
Pole is connected as the output of three rank high-pass filters and the input of the first high frequency low pass filter.
4. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described first height
Frequently low pass filter includes the 4th inductance L4, the 6th electric capacity C6, and one end of described 4th inductance L4 is as the first high frequency low pass filtered
The input of ripple device and three rank high-pass filters are connected, and the other end of described 4th inductance L4 is as the first high frequency LPF
The output of device is connected with the input of third-order low-pass filter, the other end of described 4th inductance L4 also with the 6th electric capacity C6
Negative pole be connected, the positive pole of described 6th electric capacity C6 is connected to the ground and connects.
5. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described three rank are low
Bandpass filter includes the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 being in series, the negative pole of a upper electric capacity and next electric capacity
Positive pole be connected, the 7th electric capacity C7, the 8th electric capacity C8, the two poles of the earth of the 9th electric capacity C9 be parallel with respectively the 5th inductance L5, the 6th
Inductance L6, the 7th inductance L7, described 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 positive pole also respectively with the tenth electric capacity
C10, the 11st electric capacity C11, the negative pole of the 12nd electric capacity C12 are connected, described tenth electric capacity C10, the 11st electric capacity C11,
The positive pole of 12 electric capacity C12 is all connected to the ground and connects, and the negative pole of described 7th electric capacity C7 is as the input of third-order low-pass filter
Being connected with the first high frequency low pass filter, the positive pole of described 9th electric capacity C9 is as the output and of third-order low-pass filter
The input of two high frequency low pass filters is connected.
6. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described second height
Frequently low pass filter includes the 8th inductance L8, the 13rd electric capacity C13, and one end of described 8th inductance L8 is as the second high frequency low pass
The input of wave filter is connected with third-order low-pass filter, and the other end of described 4th inductance L4 is as the second high frequency low pass filtered
The output of ripple device, the other end of described 8th inductance L8 is also connected with the negative pole of the 13rd electric capacity C13, described 13rd electricity
The positive pole of appearance C13 is connected to the ground and connects.
7. the bandpass filter of a kind of broadband according to claim 1 high out-of-side rejection, it is characterised in that：Described three rank are high
Inductance in bandpass filter, third-order low-pass filter, the first high frequency low pass filter and the second high frequency low pass filter can use
Tubular wire around inductance, paster high-frequency line around inductance or paster high-frequency ceramic inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780771.6A CN106454190B (en) | 2016-08-31 | 2016-08-31 | Band-pass filter with broadband high out-of-band rejection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610780771.6A CN106454190B (en) | 2016-08-31 | 2016-08-31 | Band-pass filter with broadband high out-of-band rejection |
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| Publication Number | Publication Date |
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| CN106454190A true CN106454190A (en) | 2017-02-22 |
| CN106454190B CN106454190B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610780771.6A Active CN106454190B (en) | 2016-08-31 | 2016-08-31 | Band-pass filter with broadband high out-of-band rejection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019000829A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳Tcl新技术有限公司 | Anti-jamming circuit of digital television set, and digital television set |
| CN113661716A (en) * | 2019-04-03 | 2021-11-16 | Ppc宽带股份有限公司 | Passive entry adapter system for cable television (CATV) networks |
| CN114928344A (en) * | 2022-06-14 | 2022-08-19 | 江南大学 | Band-pass power divider module based on IPD |
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| CN201163800Y (en) * | 2008-02-01 | 2008-12-10 | 深圳市同洲电子股份有限公司 | High-frequency signal transmission apparatus and set-top box |
| CN104506155A (en) * | 2015-01-12 | 2015-04-08 | 深圳顺络电子股份有限公司 | Filter |
| CN204885381U (en) * | 2015-07-30 | 2015-12-16 | 成都九洲迪飞科技有限责任公司 | Ultra wide band LC wave filter |
| CN204991910U (en) * | 2015-09-14 | 2016-01-20 | 成都创新达微波电子有限公司 | Absorption ripples band pass filter that declines |
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| CN201163800Y (en) * | 2008-02-01 | 2008-12-10 | 深圳市同洲电子股份有限公司 | High-frequency signal transmission apparatus and set-top box |
| CN104506155A (en) * | 2015-01-12 | 2015-04-08 | 深圳顺络电子股份有限公司 | Filter |
| CN204885381U (en) * | 2015-07-30 | 2015-12-16 | 成都九洲迪飞科技有限责任公司 | Ultra wide band LC wave filter |
| CN204991910U (en) * | 2015-09-14 | 2016-01-20 | 成都创新达微波电子有限公司 | Absorption ripples band pass filter that declines |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019000829A1 (en) * | 2017-06-27 | 2019-01-03 | 深圳Tcl新技术有限公司 | Anti-jamming circuit of digital television set, and digital television set |
| CN113661716A (en) * | 2019-04-03 | 2021-11-16 | Ppc宽带股份有限公司 | Passive entry adapter system for cable television (CATV) networks |
| CN114928344A (en) * | 2022-06-14 | 2022-08-19 | 江南大学 | Band-pass power divider module based on IPD |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106454190B (en) | 2023-06-30 |
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