CN201039095Y - A general parameter filter for high-performance RF linear phase set - Google Patents
A general parameter filter for high-performance RF linear phase set Download PDFInfo
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- CN201039095Y CN201039095Y CNU2007200124086U CN200720012408U CN201039095Y CN 201039095 Y CN201039095 Y CN 201039095Y CN U2007200124086 U CNU2007200124086 U CN U2007200124086U CN 200720012408 U CN200720012408 U CN 200720012408U CN 201039095 Y CN201039095 Y CN 201039095Y
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Abstract
A high performance RF linear phase lumped parameters filter belongs to the electronic science and technology fields. The linear phase filter is the key device in the data communications equipment, and the performance largely depends on the accuracy of debugging. The utility model connects the filter to be debugged with a network analyzer, and the network analyzer is connected with a computer. The filter frequency response is input the computer, the computer utilizes the fault diagnosis principle and the modern optimization methods to calculate the adjusted value of the replaceable element, according to the circuit theory chart, the user technical requirements and the measured response frequency, and one-time replacement of the elements can complete the debugging and manufacturing process. The debugging process is different from the existing manual debugging components one by one, which achieves the computer overall optimization debugging; all the technical indicators provided by the users are considered, at the same time ten to twenty elements are adjusted. The utility model not only reduces the phase distortion of the filter, but also keeps good selectivity.
Description
Technical field
The utility model belongs to the technical field of Electronics Science and Technology.
Background technology
Wireless radiofrequency communication need utilize filter to remove garbage and interference.Signal will produce phase deviation by filter, causes the increase of the error rate.The developing direction of modern RFDC is a high speed, reliable and secret, and this just requires the filter characteristic excellence, phase deviation few (being similar to linear phase), thus reduce the error rate.
Produce high performance filter, except design (very ripe at present), the more important thing is debugging.Because the inductance value of coil is difficult to accurately test in the filter, various factorss (general designation parasitic parameter) such as the turn-to-turn capacitance between the coil, junction capacitance and mutual inductance all can make the very big difference of generation between the characteristic that the characteristic of the filter of actual manufacturings envisions when designing.Therefore must remedy influence and the error that these parasitic parameters produce through debugging.At present general in the world adjustment method is that filter is connected on the special-purpose adjusting instrument, the adjusting successively an of element of element.The problem of this method is, first element is adjusted to after the optimum state, and when transferring second element again, first element will depart from optimum value.When adjusting the element of back, the element of front also all can depart from optimum value equally.And bigger problem is, can only consider in a plurality of technical indicators when adjusting an element.Because often have restriction between every technical indicator of filter, when adjusting an element, the direction that this technical indicator of being considered can be become better changes, and all the other most indexs generally are to change to bad direction.Therefore, it almost is impossible wanting to make all technical indicators all to reach high level.
Summary of the invention
The purpose of this utility model just provides a kind of all technical indicators of considering that simultaneously the user proposes, utilizes the principle of optimality to adjust whole interchangeable elements simultaneously, makes filter reach the filter for overall parameters of high-performance RF linear phase set of the characteristic of user expectation.
Technical solution of the present utility model is:
A kind of filter for overall parameters of high-performance RF linear phase set is characterized in that, is made of printed circuit board (PCB) 12, inductance coil 11, shunt capacitance 10, I/O pin 6, grounding pin 5 and filter housing 7; The length of circuit board 12 is 40mm, and width is 10mm; Inductance coil 11 and shunt capacitance 10 are welded on the face anyway of printed circuit board (PCB) 12 respectively, four grounding pins 5 are welded on the copper shell 7, and I/O pin 6 is welded on the two ends, the left and right sides, bottom of circuit board 12, and last overall filter encapsulates with copper shell 7.
Design circuit diagram according to the principle of optimality, as Fig. 3, component value coiling inductance coil 11 and configuration shunt capacitance 10 according to design are welded on respectively with scolding tin on the face anyway of circuit board 12, and assemble formation according to Fig. 4 and Fig. 5 and treat tunable filter.To treat that tunable filter receives on the vector network analyzer 3, vector network analyzer 3 is connected with computer 2, will treat the frequency response of tunable filter on 200 frequency sampling points---promptly all technical characteristics input computers 2.Computer 2 is according to the circuit theory diagrams of filter and the frequency response of actual measurement, utilizes fault diagnosis principle to calculate the exact value of components and parts such as all inductance, mutual inductance, turn-to-turn capacitance, junction capacitance and parasitic parameter in the filter.All technical indicators that computer 2 proposes the user convert the correspondent frequency response to, are referred to as the user expectation response.And the difference of the response of this user expectation and the frequency response of above-mentioned actual measurement as target function, utilize the modern optimization method to optimize the value of all interchangeable elements, interchangeable elements is generally electric capacity, makes the frequency response of filter approach user's response---and be the various technical indicators that the user proposes.Computer 2 is pointed out the adjusted occurrence of these interchangeable elements.According to these occurrences that computer 2 is pointed out, these elements of disposable replacing get final product.
Principle of the present utility model is such, and the frequency response of making by the circuit theory diagrams of designing that filter produced should be that get well, desirable.But because, 1) error is arranged, 2 between actual inductance value and the design load) have turn-to-turn capacitance, 3 in the coil) have mutual inductance, 4 between the inductance) there is parasitic parameter such as junction capacitance in the printed circuit board (PCB).Therefore, exist difference between the response of anticipation when the frequency response of actual test and design, promptly produced fault.Computer according to this difference, utilize fault diagnosis principle to find out to cause the reason of fault, promptly above-mentioned 4 concrete numerical value that is to say the actual value that has found component parameters and various parasitic parameters in the circuit.Computer is in these real numerical value write circuit schematic diagrams, a such circuit, and we are referred to as real circuits, and its frequency response is just the same with the frequency response of surveying.Computer utilizes the interchangeable elements in the modern optimization principle optimization real circuits then, makes the frequency response of filter approach user's response.Like this, just realized when debugging, considering all technical indicators that the user proposes simultaneously, adjusted whole interchangeable elements simultaneously, made filter reach the characteristic of user expectation.
The beneficial effect that the utility model reached is:
The filter that is used for various objectives, its centre frequency and bandwidth are Protean, and the high performance filter that has is difficult to realize with the existing conventional technological means.Beneficial effect that the utility model reached and benefit are example with 700MHz ± 190MHz linear phase band pass filter, and the technical indicator that the filter of the technical indicator of domestic and international main product and the utility model manufacturing can reach is done one relatively.
Table 1: 700MHz ± 190MHz linear phase band pass filter that the utility model is made is accessible
Technical indicator and the comparison of the technical indicator of main product both at home and abroad
| Band standing internal wave ratio | Insert loss (dB) | L dB bandwidth Group Delay Ripple | L dB bandwidth phase deviation degree | The ratio of three dB bandwidth tolerance and centre frequency | Squareness factor (40dB/1 dB) | |
| External main | <1.3∶1 | <2.6dB | <0.7ns | ±2.8° | 3％ | <2.5 |
| The miscarriage product | ||||||
| Domestic main product | <1.5∶1 | <3dB | <0.8ns | ±3° | Undeclared | <2.5 |
| The utility model can reach | <1.2∶1 | <2.5dB | <0.5ns | ±2.0° | 1％ | <2.2 |
As seen from the above table, the linear phase filter made from method of the present utility model can surpass the level of like product in the world comprehensively on technical indicator.
Description of drawings
Below in conjunction with accompanying drawing and concrete real-time mode the utility model is further described.
Fig. 1 is an embodiment software block diagram of the present utility model.
Fig. 2 is the hardware system figure of filter debugging of the present utility model and capacity measurement.
Fig. 3 is a filter circuit schematic diagram of the present utility model.
Fig. 4 is a filter printed circuit board (PCB) front view of the present utility model.
Fig. 5 is a filter printed circuit board (PCB) rearview of the present utility model.
Among the figure, 1. electric impedance analyzer, 2. computer, 3. vector network analyzer, 4. filter, 5. grounding pin, 6. I/O pin, 7. filter housing 8. applies the copper node, 9. applies copper ground connection, 10. shunt capacitance, 11. inductance coils, 12. printed circuit board (PCB)s.
Embodiment
Centre frequency 140MHz, bandwidth is the process that designs and produces of the band pass filter of 40MHz:
1,, enters capacitance management software and select electric capacity according to the index Design circuit
Wave filter technology requires:
Centre frequency: 140MHz bandwidth: 40MHz
Insert loss:＜1.2dB standing-wave ratio:＜1.3: 1
Group delay:＜1.5ns phase deviation: ± 0.7 °
K40d B/1dB squareness factor:＜3.8 bands are outer to be suppressed:〉60dB
Design circuit (seeing accompanying drawing 3 filter circuit schematic diagrams) according to the existing conventional Optimal Design Method.
Component parameters is:
C1＝9.7751pF C2＝19.826pF C3＝19.801pF C4＝14.484pF
C5＝7.0591pF C6＝6.8239pF C7＝11.277pF C8＝15.060pF
C9＝23.639pF C10＝30.897pF C11＝8.5530pF C12＝7.9047pF
C13＝4.8700pF L14＝34.676nH L15＝74.628nH L16＝7.4558nH
L17＝45.174nH L18＝45.100nH L19＝76.571nH C`20＝0.4pF
C21＝0.4pF C22＝0.8pF
Wherein C`20～C`22 is coil turn-to-turn capacitance and the junction capacitance of estimating, the estimated value (estimated value of coil turn-to-turn capacitance and junction capacitance is 0.4pF) that also comprises these parasitic parameters among C1～C13, deducting them from C1～C13 then is the capacitance that needs installation.These capacitances enter capacitance management system, select electric capacity.
2, choose corresponding electric capacity by capacitance management software through the electric capacity storehouse.
This process is such, measures a collection of electric capacity commonly used, 2,000 by the hardware system of the manipulation of the capacitance management software in block diagram filter debugging and capacity measurement in advance.And these electric capacity are put into one by one a numbered grid, the appearance value of each electric capacity and numbering enter computer (2), form the data file of an electric capacity.An electric capacity storehouse and capacitance management system have so just been set up.
When above-mentioned design was made, capacitance management system was at first selected C1 in the capacitance data file.Generally be with 2,000 per two parallel connection of electric capacity has so just produced 2,000,000 kind of parallel way, the capacitance and the design load of this 2,000,000 parallel connection are compared, one group of shunt capacitance of error identifying minimum, providing the numbering of these two electric capacity by computer (2), for example is 896 and 1231, and value after these two electric capacity parallel connections and the ERROR CONTROL between the design load are below 0.2%.Just these two electric capacity being taken out of manually will doing gets final product.With can find out C2～C13 with quadrat method.
3, enter the technology manufacturing, obtain filter to be transferred.
Filter Structures (seeing Fig. 4 filter graph architecture).C1～the C13 in parallel in twos that selectes on the face bonding of circuit board (12), the reverse side welding inductance coil (11) of circuit board (12).These inductance coils (11) are according to the design load coiling.Certainly, exist bigger error between the inductance value of these coils and the design load, also exist mutual inductance between each coil, these unfavorable factors will be remedied by debug process.
4, filter that will be to be transferred (4) is received on the hardware system of debugging, (seeing the hardware system of Fig. 2 filters to test and capacity measurement).
5, computer (2) is handled the frequency response input computer (2) of vector network analyzer (3) with 200 frequency sampling points among 60MHz～220MHz, use above-mentioned fault diagnosis principle then the actual value of L14～L19, M23～M27 and C`20, C`21 and C`22 is calculated, as following table
L14＝39.93 7nH L15＝67.752nH L16＝75.052nH L17＝45.900nH
L18＝46.987nH L19＝72.276nH M23＝1.5643nH M24＝-2.0837nH
M25＝1.8746nH M26＝-1.7645nH M27＝2.2365nH C`20＝0.46758pF
C`21＝0.39867pF C`22＝0.98787pF
Find the actual value for the treatment of component parameters and various parasitic parameters in the tunable filter circuit in other words, promptly found above-mentioned said real circuits.Computer (2) analyzes the frequency response of this real circuits, and this response is just the same with the frequency response for the treatment of the tunable filter actual measurement, and it generally is not a desirable response.Every technical indicator that above-mentioned user is proposed converts user's response (being desirable frequency response) to, and the adjustment amount of answering of 13 capacitances is made as design variable, utilizes above-mentioned optimization method to optimize them, makes the real response of filter (4) approach user's response.Like this, just realize considering simultaneously all specification requirements of user, optimized the process of all interchangeable elements in (adjustment) filter simultaneously.
The value of former C1～C13 is added that to answer adjustment amount gained result as follows:
C1＝11.009pF C2＝20.610pF C3＝19.180pF C4＝13.361pF
C5＝6.3654pF C6＝5.9027pF C7＝14.076pF C8＝17.429pF
C9＝20.552pF C10＝25.274pF C11＝10,055pF C12＝8.1650pF
C13＝4.8271pF
From new C1～C13, deduct the above-mentioned coil turn-to-turn capacitance and the estimated value of junction capacitance, needing just to have obtained the capacitance of replacing.Because what optimize is the adjusted value of these 13 electric capacity, so the capacitance that the needs that obtain are changed has been considered the actual value of coil turn-to-turn capacitance and junction capacitance.
6, the electric capacity that utilizes capacitance management software, electric capacity storehouse and above-mentioned pairing to select the method for electric capacity to select these to change.
7, enter the technology manufacturing, change original 13 electric capacity, obtain final filter.
The result of debugging back test is as follows:
Centre frequency: 140MHz bandwidth: 40MHz
Insert loss:＜1.1dB standing-wave ratio:＜1.2:1
Group delay:＜1.3ns phase deviation: ± 0.5 °
The K40dB/1dB squareness factor:＜3.6 bands are outer to be suppressed:〉65dB
Satisfy user's requirement fully.For making typical products in mass production, only need to adjust a sample, all the other strictnesses are pressed the sample manufacturing and are got final product.
Claims (1)
1. a filter for overall parameters of high-performance RF linear phase set is characterized in that, is made of printed circuit board (PCB) (12), inductance coil (11), shunt capacitance (10), I/O pin (6), grounding pin (5) and filter housing (7); The length of printed circuit board (PCB) (12) is 40mm, width is that face anyway, four grounding pins (5) that 10mm inductance coil (11) and shunt capacitance (10) are welded on printed circuit board (PCB) (12) respectively are welded on the copper shell (7), I/O pin (6) is welded on the two ends, the left and right sides, bottom of printed circuit board (PCB) (12), and last overall filter encapsulates with copper shell (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200124086U CN201039095Y (en) | 2007-05-28 | 2007-05-28 | A general parameter filter for high-performance RF linear phase set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200124086U CN201039095Y (en) | 2007-05-28 | 2007-05-28 | A general parameter filter for high-performance RF linear phase set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039095Y true CN201039095Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200124086U Expired - Fee Related CN201039095Y (en) | 2007-05-28 | 2007-05-28 | A general parameter filter for high-performance RF linear phase set |
Country Status (1)
| Country | Link |
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| CN (1) | CN201039095Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832906A (en) * | 2012-08-17 | 2012-12-19 | 中国电力科学研究院 | Clock delay control method based on printed circuit board |
| CN110797612A (en) * | 2019-11-08 | 2020-02-14 | 大连海事大学 | Self-equalization linear phase filter based on negative group time delay admittance converter |
-
2007
- 2007-05-28 CN CNU2007200124086U patent/CN201039095Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832906A (en) * | 2012-08-17 | 2012-12-19 | 中国电力科学研究院 | Clock delay control method based on printed circuit board |
| CN102832906B (en) * | 2012-08-17 | 2016-04-20 | 中国电力科学研究院 | Based on the clock delay control method of printed circuit board (PCB) |
| CN110797612A (en) * | 2019-11-08 | 2020-02-14 | 大连海事大学 | Self-equalization linear phase filter based on negative group time delay admittance converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110528 |