CN102347742A - 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit - Google Patents
1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit Download PDFInfo
- Publication number
- CN102347742A CN102347742A CN2011101586929A CN201110158692A CN102347742A CN 102347742 A CN102347742 A CN 102347742A CN 2011101586929 A CN2011101586929 A CN 2011101586929A CN 201110158692 A CN201110158692 A CN 201110158692A CN 102347742 A CN102347742 A CN 102347742A
- Authority
- CN
- China
- Prior art keywords
- resistance
- inductance
- signal
- node
- adsl
- 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.)
- Granted
Links
Images
Landscapes
- Filters And Equalizers (AREA)
Abstract
The invention provides a 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit composed of ten order difference signal filtering circuits connected in series, wherein each order difference signal filtering circuit comprises a first inductor, a first resister, a second resister and a second inductor connected in parallel and a node A which are connected in series, and a third inductor, a third resister, a fourth resister and a fourth inductor connected in parallel and a node B which are connected in series; a capacitor is connected in series between the node A and the node B; the first/third inductor of the first-order difference signal filtering circuit is also connected with the positive pole/negative pole of an ADSL signal input terminal; the first/third inductors of the second- to the tenth-order difference signal filtering circuits are also connected with the nodes A/B of the previous order difference signal filtering circuit; and the node A/B of the tenth-order difference signal filtering circuit is connected with the positive pole/negative pole of the ADSL signal output terminal. The invention is equivalent to realize the purpose of ADSL signal attenuation by a 1kFt telephone line, thus saving the production cost and being easy to realize.
Description
Technical field
The present invention relates to the rate test technical field of ADSL product, relate in particular to a kind of 1kFtADSL signal attenuation circuit that is applied to rate test.
Background technology
At present, DSL (Digital Subscriber Line), promptly digital subscriber line is to be the point-to-point transmission technology of transmission medium with the copper telephone wire.The DSL technology is supported symmetry and asymmetric transmission mode on the local loop of traditional telephone network (POTS), solved the transmission bottleneck problem that often occurs in " last kilometer " between Internet service provider and end user.Because telephone subscriber's loop is by a large amount of layings; How to make full use of existing copper cable resource; Realize inserting at a high speed the research emphasis that just becomes industry through copper twisted pair, so the DSL technology obtains soon paying attention to, and obtain widely applying in some countries and regions.
In the test of ADSL product, often need the connection speed under the test actual range, common measuring distance has 1kFt, 2kFt, 3kFt ~ 19kt, and what transmission rate the main simulation of this kind test actual user can reach under different distance.The realization of simulation different distance has two kinds of implementation methods in the ADSL product test at present: 1) buy the telephone wire of standard, be divided into 1kFt, 2kFt, 3kFt ~ 19kFt, under different distance, test then.2) test through using special equipment to simulate different distance.Yet above-mentioned two kinds of implementation methods respectively have pluses and minuses: use the measurement result of the method that actual telephone wire tests accurate, but line length is not easy under different distance, to carry out switch test; The advantage of using special equipment mainly is that convenience and automation are high, but cost is expensive especially, and the equipment of a simple analog different length telephone wire needs RMB up to a million.Thereby, a kind of new implementation method of necessary proposition.
Summary of the invention
The object of the present invention is to provide a kind of 1kFtADSL signal attenuation circuit to come equivalence to realize of the decay of 1kFt length telephone wire to the ADSL signal; The user can be implemented in the test of the connection speed of ADSL product under the different distance through combination and this elementary cell of cascade, is convenient under different distance, carry out switch test;
Another object of the present invention provides a kind of 1kFtADSL signal attenuation circuit, uses basic electronic devices and components such as basic inductance, resistance, electric capacity to design, and reduces production costs greatly.
The objective of the invention is to realize through following technical scheme.
A kind of 1kFtADSL signal attenuation circuit, this circuit is composed in series by ten first-order difference signal filter circuits;
Said first-order difference signal filter circuit comprises: first inductance, second inductance, the 3rd inductance, the 4th inductance, first resistance, second resistance, the 3rd resistance, the 4th resistance and first electric capacity; Wherein, second resistance after said first inductance, first resistance, the parallel connection and second inductance, node A connect successively; The 4th resistance and the 4th inductance, Node B after the 3rd inductance, the 3rd resistance, the parallel connection are connected successively; Also be in series with first electric capacity between said node A and the Node B;
For the first jump sub-signal filter circuit, the other end of its first inductance links to each other with ADSL signal input part positive pole, the other end of the 3rd inductance links to each other with ADSL signal input part negative pole; For second to the tenth jump sub-signal filter circuit, the other end of its first inductance links to each other with the node A of last jump sub-signal filter circuit, the other end of the 3rd inductance links to each other with the Node B of last jump sub-signal filter circuit; For the tenth jump sub-signal filter circuit, its node A is connected to ADSL signal output part positive pole, Node B is connected to ADSL signal output part negative pole;
Also be in series with the high-frequency signal filter element between said ADSL signal input part positive pole and the negative pole, also be in series with impedance matching element between said ADSL signal output part positive pole and the negative pole.
Preferably, said high-frequency signal filter element is made up of two second capacitances in series, said first electric capacity and second electric capacity adopt the appearance value be 1.5nF, precision for ± 1pF, withstand voltage be that 50V, material are the ceramic condenser of NP0.
Preferably, said impedance matching element employing resistance is that 100 Europe, precision are ± 1% the 5th resistance.
Preferably, to adopt the sense value be 5.6uH, precision for ± 2%, equivalent resistance is the wire-wound inductor in 1.95 Europe for said first inductance and the 3rd inductance.
Preferably, the resistance of said first resistance and the 3rd resistance is that 1.87 Europe, precision are ± 1%.
Preferably, the resistance of said second resistance and the 4th resistance is that 4.02 Europe, precision are ± 1%.
Preferably, to adopt the sense value be 1.2uH, precision for ± 2%, equivalent resistance is the wire-wound inductor in 1.2 Europe for said second inductance and the 4th inductance.
Compared with prior art, the embodiment of the invention has following beneficial effect:
The present invention has realized the decay of equivalent 1kFt length telephone wire to the ADSL signal through using basic electronic devices and components; Mode through simple combination cascade attenuator circuit of the present invention when using can realize the ADSL signal attenuation under the different distance; Can quick and conveniently realize switch test exactly to the connection speed of ADSL product; Solved the loaded down with trivial details problem of bringing when actual telephone wire is tested of wiring of using; And practiced thrift production cost, improved production efficiency.
Description of drawings
Fig. 1 is attenuation amplitude and the phase place performance plot with respect to frequency;
Fig. 2 is the Cauer type electronic circuit graph model of k rank Butterworth filter;
Fig. 3 is first-order difference signal attenuation circuit figure in the embodiment of the invention;
Fig. 4 is 1kFtADSL signal attenuation circuit figure in the embodiment of the invention;
Fig. 5 is the realization schematic diagram that can realize ADSL signal attenuation under 1 ~ 19kFt different distance.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Because bandwidth filter not only has the function that the outer signal of certain limit bandwidth is isolated; Also has the function that the signal in certain bandwidth range is decayed; Thereby utilize attenuation to the specific bandwidth range signal, select for use the suitable filters model to design and be equivalent to the attenuator circuit of 1kFt length telephone wire ADSL signal attenuation effect.
Core concept of the present invention is: the principle of utilizing algorithm device that LRC sets up to decay to different frequency signals; Use basic electronic devices and components such as basic inductance, resistance, electric capacity, switch to design and realize ADSL signal attenuation circuit elementary cell, this unit equivalence realizes the decay of the telephone wire of 1kFt length to the ADSL signal.Then, can realize the decay of different distance under 1～19kFt through combination cascade ADSL signal attenuation circuit elementary cell of the present invention.
The scope of the operating frequency of ADSL signal is 25.875kHz ~ 1.04MHz; According to the universal standard TR067 1kFt of ADSL decay requirement in each frequency; The present invention need select rational filter model for use; Use simulation software that model or circuit parameter are calculated, also can advance test comparison with frequency equipment reach emulation and standard-required to design side circuit then.
Below the design process of 1kFt ADSL signal attenuation circuit in the embodiment of the invention will be described according to the following step.
1) decay according to the TR067 standard requires to choose rational Filtering Model.
Can know that from the analysis of following table one it is along with frequency requirement is made linear change that the decay of ADSL signal requires, can not occur rising and falling.And in Chebyshev filter, Butterworth filter, elliptic filter model, have only the frequency response curve of Butterworth filter in passband smooth to greatest extent, and do not rise and fall, then drop to zero gradually at suppressed frequency band.On the Bode diagram of the logarithm diagonal frequencies of as shown in Figure 1 amplitude; Begin from a certain rim angle frequency; Amplitude gradually reduces along with the increase of angular frequency, and the characteristics of trend minus infinity meet the requirements, and are all undesirable as the bad some phenomenon that Chebyshev filter can occur rising and falling.Therefore the present invention chooses the Butterworth filter model.
Table one
2) exponent number of selecting filter
The attenuation rate of single order Butterworth filter is 6 decibels of every frequencys multiplication, 20 decibels of per ten frequencys multiplication; The attenuation rate of second order Butterworth filter is 12 decibels of every frequencys multiplication; The attenuation rate of three rank Butterworth filters is 18 decibels of every frequencys multiplication, so analogizes.The amplitude diagonal frequencies of Butterworth filter is dull to descend, and also is the filter that how many unique exponent numbers is, amplitude diagonal frequencies curve all keeps same shape.Only filter order is high more, and is fast more in suppressed frequency band amplitude fading speed.The amplitude diagonal frequencies figure of other filter high-orders and the amplitude diagonal frequencies of harmonic series have different shapes.Analyze below how to choose and realize exponent number of the presently claimed invention.
Its transfer function:
Wherein, the exponent number of n=filter, ω
cFrequency when=cut-off frequency=amplitude drops to-3 decibels, ω
p=passband marginal frequency, 1/ (1+ ε
2)=| H (ω) |
2Numerical value at the passband edge.
On two-dimentional complex plane
Numerical value that s=j ω is ordered=| H (ω) |
2, therefore pass through analytical continuation:
It is ω that the limit of above-mentioned function is distributed in radius equidistantly
cCircle on
Therefore,
The amplitude and the frequency relation of n rank Butterworth LPF can be used following formulate:
Wherein, G representes the magnification ratio of filter, and H representes transfer function, and j is an imaginary unit, and n representes the progression of filter, and ω is the angular frequency (is unit with the radian per second) of signal, ω
cIt is the amplitude cut-off frequency 3 decibels time that descends;
Make cut-off frequency ω
c=1, above-listed formula normalization is become:
Ask the exponent number of filter according to the degree of decay
Make 1/A=
G n (ω)
Choose ω=2 o'clock,
G n (ω)=0.004
A=200, and n=9.6 gets bigger integer, so the exponent number of present embodiment median filter is 10.
3) calculating of circuit parameter and selection
The Cauer type electronic circuit graph model of k rank Butterworth filter as shown in Figure 2,
After a component signal Vin Kaul type filter attenuation circuit whose output is Vout,? Its transfer function is:
Wherein R1 and L2 parallel connection are in order to increase the attenuation coefficient that its impedance and C2 form RC algorithm device, to have only tens bold and unconstrained Ou Wufa because of general inductance L 2 its internal resistances and satisfy decay.
Calculation of parameter:
When R11=1.87 Europe,
R1=2.15R11=2.15*1.87 Europe=4.0205 Europe, the resistance of getting possibility is R1=4.02 Europe;
(K = the selected order of the filter), the calculated C2 = 3.0nF;
4) conversion of ADSL differential signal attenuator circuit and parameter are confirmed
Because of circuit shown in Figure 2 is to say for general analog signal design, and ADSL signal when transmission used be the differential signal of simulation.So this step converts it to difference channel.General analog signal is with GND point as a reference, and differential signal positive and negative can reference center point or respectively coming equivalence separately as a reference.The single order ADSL differential signal filter that equivalence obtains as shown in Figure 3, wherein the C2 after the equivalence should reduce by half because of capacitances in series is equivalent to the appearance value in half of original C2.
5) 1kFtADSL signal attenuation circuit
As previously mentioned; The present invention needs ten rank ADSL differential signal filter circuits to realize; Owing to obtained single order ADSL differential signal filter circuit in the last step; Then only need in this step ten single order ADSL differential signal filter circuits are together in series; Add impedance matching and high-frequency signal filtering electronic devices and components; Can obtain final 1kFt ADSL signal attenuation circuit, as shown in Figure 4.When using this circuit, the positive and negative first-order filtering circuit decay back of forming through last Fig. 3 respectively of ADSL analog difference signal arrives A, two nodes of B, gets into the same filter circuit of single order down again, so successively through ten such first-order filtering circuit.
Wherein R=100 Europe is used for the coupling usefulness of ADSL analog difference signal, and precision is 1%;
C1, C5 are used for the filtering greater than the 1.2MHz signal;
C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12 be appearance value 1.5nF, the positive and negative 1pF of precision,
Withstand voltage is that 50V, material are the ceramic condenser of NP0;
L1, L3, L5, L7, L9, L11, L13, L16, L18, L20, L23, L25, L27, L29, L31, L33, L35, L37 are that sense value 5.6uH, precision ± 2%, equivalent resistance are the wire-wound inductor in 1.95 Europe;
L2, L4, L6, L8, L10, L12, L14, L15, L17, L19, L21, L22, L24, L26, L28, L30, L32, L34, L36, L38 are that sense value 1.2uH, precision ± 2%, equivalent resistance are the wire-wound inductor in 1.2 Europe;
R1, R2, R3, R10, R11, R12, R13, R14, R15, R16, R25, R26, R27, R28, R29, R30, R31, R39, R40, the resistance of R41 is that 4.02 Europe, precision are ± 1%;
R4, R5, R6, R7, R8, R9, R17, R18, R19, R20, R21, R22, R23, R24, R32, R33, R34, R36, R37, the R38 resistance is that 1.87 Europe, precision are ± 1%;
The resistance of R35 is that 100 Europe, precision are ± 1%.
6) PCB of 1kFtADSL signal attenuation circuit design
According to circuit theory diagrams shown in Figure 4, choose the parameter of electronic devices and components and carried out device package, design final printed circuit board with the PCB design tool, produce the PCB Gerber file of standard then; Finally can be dealt into PCB manufacturer makes.
7) checking of side circuit, test and conclusion
Go out PCB according to actual design, then model is carried out the ADSL product connection rate test of S21 parameter testing and actual telephone wire.After carrying out the S21 parameter testing with frequency spectrograph, the requirement of contrast table one sees if there is bigger difference, and test result is seen table two; In the environment of reality, carry out the ADSL product is connected rate test under 1kFt telephone wire and attenuating plate contrast then, test result is seen table three.Can draw the 1kFt attenuating plate of present embodiment design from table two bigger slightly than standard, but meet the requirements.Can find out that from table three actual ADSL product is the same with the effect of 1kFt attenuating plate at the 1kFt telephone wire respectively.Conclusion: 1kFt ADSL signal attenuation circuit of the present invention is equivalent to actual telephone wire effect fully.
Table two
Table three
To sum up; The connection rate test of ADSL product can adopt 1kFt ADSL signal attenuation circuit of the present invention to realize; Illustrate below and show process in fact: realize 2kFt, 4kFt, 8kFt attenuation module with 1kFt ADSL signal attenuation circuit respectively; Just can realize 1 ~ 19kFt different distance through switch combination and stack then; Its realization structured flowchart is seen shown in Figure 5; Can make the ADSL attenuator according to this theory structure block diagram, such product can be used for the production test with the adsl feature product in batches.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a 1kFtADSL signal attenuation circuit is characterized in that, this circuit is composed in series by ten first-order difference signal filter circuits;
Said first-order difference signal filter circuit comprises: first inductance, second inductance, the 3rd inductance, the 4th inductance, first resistance, second resistance, the 3rd resistance, the 4th resistance and first electric capacity; Wherein, second resistance after said first inductance, first resistance, the parallel connection and second inductance, node A connect successively; The 4th resistance and the 4th inductance, Node B after the 3rd inductance, the 3rd resistance, the parallel connection are connected successively; Also be in series with first electric capacity between said node A and the Node B;
For the first jump sub-signal filter circuit, the other end of its first inductance links to each other with ADSL signal input part positive pole, the other end of the 3rd inductance links to each other with ADSL signal input part negative pole; For second to the tenth jump sub-signal filter circuit, the other end of its first inductance links to each other with the node A of last jump sub-signal filter circuit, the other end of the 3rd inductance links to each other with the Node B of last jump sub-signal filter circuit; For the tenth jump sub-signal filter circuit, its node A is connected to ADSL signal output part positive pole, Node B is connected to ADSL signal output part negative pole;
Also be in series with the high-frequency signal filter element between said ADSL signal input part positive pole and the negative pole, also be in series with impedance matching element between said ADSL signal output part positive pole and the negative pole.
2. 1kFtADSL signal attenuation circuit as claimed in claim 1; It is characterized in that; Said high-frequency signal filter element is made up of two second capacitances in series, said first electric capacity and second electric capacity adopt the appearance value be 1.5nF, precision for ± 1pF, withstand voltage be that 50V, material are the ceramic condenser of NP0.
3. 1kFtADSL signal attenuation circuit as claimed in claim 1 is characterized in that, it is that 100 Europe, precision are ± 1% the 5th resistance that said impedance matching element adopts resistance.
4. 1kFtADSL signal attenuation circuit as claimed in claim 1 is characterized in that, it is 5.6uH, precision for ± 2% that said first inductance and the 3rd inductance adopt the sense value, equivalent resistance is the wire-wound inductor in 1.95 Europe.
5. 1kFtADSL signal attenuation circuit as claimed in claim 1 is characterized in that, the resistance of said first resistance and the 3rd resistance is that 1.87 Europe, precision are ± 1%.
6. 1kFtADSL signal attenuation circuit as claimed in claim 1 is characterized in that, the resistance of said second resistance and the 4th resistance is that 4.02 Europe, precision are ± 1%.
7. 1kFtADSL signal attenuation circuit as claimed in claim 1 is characterized in that, it is 1.2uH, precision for ± 2% that said second inductance and the 4th inductance adopt the sense value, equivalent resistance is the wire-wound inductor in 1.2 Europe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158692.9A CN102347742B (en) | 2011-06-14 | 2011-06-14 | 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158692.9A CN102347742B (en) | 2011-06-14 | 2011-06-14 | 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102347742A true CN102347742A (en) | 2012-02-08 |
| CN102347742B CN102347742B (en) | 2017-02-08 |
Family
ID=45546072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110158692.9A Expired - Fee Related CN102347742B (en) | 2011-06-14 | 2011-06-14 | 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102347742B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190872A (en) * | 2019-07-05 | 2019-08-30 | 郑州艾迪科技有限公司 | A kind of cable emulation circuit and its application |
| CN110946576A (en) * | 2019-12-31 | 2020-04-03 | 西安科技大学 | Visual evoked potential emotion recognition method based on width learning |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1441548A (en) * | 2002-02-26 | 2003-09-10 | 致伸科技股份有限公司 | Bidirectional low-pass filter suitable for communication network |
| WO2004062171A3 (en) * | 2002-12-23 | 2004-12-16 | Sbc Properties Lp | Equivalent working length determinative system for digital subscriber line circuits |
| CN1624763A (en) * | 2003-12-03 | 2005-06-08 | 明基电通股份有限公司 | Function detection device of voice module |
| US7564895B2 (en) * | 2001-03-29 | 2009-07-21 | Nortel Networks Limited | Method and apparatus for monitoring channel frequency response |
| CN201467147U (en) * | 2009-06-04 | 2010-05-12 | 上海共联通信信息发展有限公司 | Testing and repairing system of ADSL user terminal equipment |
-
2011
- 2011-06-14 CN CN201110158692.9A patent/CN102347742B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7564895B2 (en) * | 2001-03-29 | 2009-07-21 | Nortel Networks Limited | Method and apparatus for monitoring channel frequency response |
| CN1441548A (en) * | 2002-02-26 | 2003-09-10 | 致伸科技股份有限公司 | Bidirectional low-pass filter suitable for communication network |
| WO2004062171A3 (en) * | 2002-12-23 | 2004-12-16 | Sbc Properties Lp | Equivalent working length determinative system for digital subscriber line circuits |
| CN1624763A (en) * | 2003-12-03 | 2005-06-08 | 明基电通股份有限公司 | Function detection device of voice module |
| CN201467147U (en) * | 2009-06-04 | 2010-05-12 | 上海共联通信信息发展有限公司 | Testing and repairing system of ADSL user terminal equipment |
Non-Patent Citations (2)
| Title |
|---|
| 云廷进: "基于DSP技术的ADSL测试方法的研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 陈卫: "非对称数字用户线路性能的在线测试方法", 《现代电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190872A (en) * | 2019-07-05 | 2019-08-30 | 郑州艾迪科技有限公司 | A kind of cable emulation circuit and its application |
| CN110946576A (en) * | 2019-12-31 | 2020-04-03 | 西安科技大学 | Visual evoked potential emotion recognition method based on width learning |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102347742B (en) | 2017-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106353549B (en) | A kind of conditioned circuit device and voltage measuring apparatus | |
| CN104579241B (en) | Programmable filter | |
| CN105594123B (en) | Variable ratio frequency changer filter | |
| US2788496A (en) | Active transducer | |
| CN106785258A (en) | A kind of Wide stop bands microstrip line low pass filter and method for designing | |
| CN102435849A (en) | Method for improving frequency measurement precision by using digital filter | |
| JP2007214800A (en) | Complex filter circuit | |
| CN107706908B (en) | Port impedance zero-pole matching-based alternating current network frequency division band equivalence method for power system | |
| CN102347742A (en) | 1kFtADSL (1kFt Asymmetrical Digital Subscriber Loop) signal attenuation circuit | |
| CN105024734B (en) | Suppress the method and its system of power information acquisition system interference signal | |
| CN114900149B (en) | Low-pass filter and optical communication testing device | |
| CN109450402A (en) | Ten quadravalence switched capacitor bandpass filters | |
| CN105244572B (en) | A kind of filter design method based on Chebyshev's impedance transformer network technology | |
| CN204362009U (en) | A kind of analog bandpass filtering device | |
| CN104506158A (en) | Analog band pass filter | |
| CN204859178U (en) | System for restrain power consumption information collection system interfering signal | |
| CN103973254A (en) | Transimpedance type integrated band-pass filter design method | |
| CN210514514U (en) | Small signal acquisition circuit applied to power distribution terminal | |
| CN106788263A (en) | A kind of fractional order condenser network | |
| CN102386887A (en) | Tracking filter circuit based on pulse width modulation and design method thereof | |
| CN111478681B (en) | Design method of analog composite filter circuit and analog filter circuit | |
| Sun et al. | A Design Method of Active Btterworth, High-Pass Filter with Sallen-Key Topology | |
| CN110707401A (en) | Coupling line loading low-pass or band-stop filter with reconfigurable transmission response | |
| Nakagawa et al. | Synthesis of a first-order passive complex filter with band-pass/band-elimination characteristics | |
| CN107332534A (en) | A kind of circuit structure and its design method for filtering power splitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20170208 Termination date: 20180614 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |