CN107995774A - A kind of cabling optimization method of Surface Mount radio-frequency maser - Google Patents
A kind of cabling optimization method of Surface Mount radio-frequency maser Download PDFInfo
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- CN107995774A CN107995774A CN201711214618.8A CN201711214618A CN107995774A CN 107995774 A CN107995774 A CN 107995774A CN 201711214618 A CN201711214618 A CN 201711214618A CN 107995774 A CN107995774 A CN 107995774A
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- Prior art keywords
- cabling
- radio
- surface mount
- impedance
- pad
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/025—Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09227—Layout details of a plurality of traces, e.g. escape layout for Ball Grid Array [BGA] mounting
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention discloses a kind of cabling optimization method of Surface Mount radio-frequency maser, and this method empties neighboring reference plane at the Surface Mount pad of surface-mount type radio-frequency maser, increases blank medium thickness, improves impedance, improve impedance operator；Transition for wide pad to thin cabling, the cabling of extraction take gradual change cabling so that impedance persistently changes, and not mutated, and thinner cabling so can be smoothly transitioned into very much by thicker pad；In the view field of surface-mount type radio-frequency maser, corresponding reference planes layer does not inside contract, and ensures the impedance continuity of pad.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of cabling optimization method of Surface Mount radio-frequency maser.
Background technology
For the SI (Signal Integrity, signal integrity) of high-speed digital circuit, Study on Problems is both at home and abroad at present
Many achievements are achieved, it is increasingly complicated with PCB functions and structure so that corresponding Theory of Circuit Analysis is from one-dimensional, two-dimentional
Three-dimensional structure is developed into, poor, via such as between short-term, chip lead-out wire, pin, line, these belong to parameter extraction combination
The method of circuit analysis.But for the complication system of high speed, solve the problems, such as that there are certain difficulty using circuit methods sometimes
Degree, the method that nowadays high-performance, the computer system of large capacity allow us directly to be simulated with electromagnetic field carry out multi-layer PCB
The Electrical characteristic simulation of plate.But for radio frequency microwave circuit developed in recent years, since high-frequency radio frequency device is for circuit
The response of the mimic effect of transmission line is extremely complex on plate, and the characteristic of high speed analog circuit at different frequencies presents uncertain
Property, make its high speed model be difficult to meet the required precision of actual circuit plate level emulation, therefore mixed to frequency microwave structure and digital-to-analogue
The simulation study for closing circuit is imperative.
The frequency microwave of country's military industry field and the demand of numerical model analysis product are more and more at present, and the frequency of design is general
All over all more than L-band (radio waveband of the frequency in 1-2GHz), or even some have had reached millimere-wave band, to ensure
The performance of radiofrequency signal on frequency microwave plate, numerical model analysis plate, input of the radio-frequency maser of generally use costly as signal
Output and switching, or even need to customize radio-frequency maser, this undoubtedly adds design cost and device buying difficulty.According to circuit board
The mode radio-frequency maser of connection can be divided into inserting radio-frequency maser and surface mount radio-frequency maser (abbreviation Surface Mount radio-frequency maser), Surface Mount radio-frequency maser
Refer to a kind of radio-frequency maser that the welding of the Surface Mount disk on the signal pin and plate of radio-frequency maser is attached, the institute of traditional Surface Mount radio-frequency maser
With cannot meet above-mentioned frequency microwave plate, on numerical model analysis plate radiofrequency signal performance, trace it to its cause and be：First, Surface Mount radio frequency
The signal pin of head is the trace width of a big Surface Mount pad, general frequency microwave plate and numerical model analysis plate analog portion
In 20mil or so, the Surface Mount pad of radio-frequency maser is wider than this width very much, causes its impedance to be less than 50 Europe, therefore can lead
Impedance discontinuity point is just encountered in cause when signal accesses, and influences signal quality；2nd, because Surface Mount pad ratio walks line width,
Still there are an impedance discontinuities in the place for going to cabling by pad, and can also exist on the quality of signal influences；3rd, general radio frequency
Head is placed against edges of boards, and Surface Mount disk is also close to edges of boards, so may result in letter when reference layer copper sheet carries out conventional inside contract
Number access Surface Mount pad reference it is discontinuous, cause the impedance discontinuity at this.
The content of the invention
It is an object of the invention to by a kind of cabling optimization method of Surface Mount radio-frequency maser, to solve background above technology department
Divide the problem of mentioning.
For this purpose, the present invention uses following technical scheme：
A kind of cabling optimization method of Surface Mount radio-frequency maser, this method include：
S101, at the Surface Mount pad of surface-mount type radio-frequency maser, empty neighboring reference plane, increase blank medium thickness；
S102, the transition for wide pad to thin cabling, the cabling of extraction take gradual change cabling；
S103, the view field in surface-mount type radio-frequency maser, corresponding reference planes layer do not inside contract.
Especially, blank medium thickness refers to the Surface Mount pad of top layer with adjacent earth formations as reference in the step S101
The core plate of plane, top layer and the second layer or the thickness of pp pieces；It is described to empty neighboring reference plane, increase blank medium thickness bag
Include：In the case where third layer has ground copper to refer to and flow back for radiofrequency signal, second layer plane stratum pad view field is dug up
Copper sheet, and judge whether impedance reaches sets requirement.
Especially, the step S101 is further included：If impedance is not up to sets requirement, the correspondence copper sheet of third layer is dug
Fall, with reference to the 4th layer, then judge whether impedance reaches sets requirement, and so on, until impedance meets sets requirement.
The cabling optimization method of Surface Mount radio-frequency maser proposed by the present invention empties phase at the Surface Mount pad of surface-mount type radio-frequency maser
Adjacent reference planes, increase blank medium thickness, improve impedance, improve impedance operator；For wide pad to thin cabling
Transition, the cabling of extraction takes gradual change cabling so that impedance persistently changes, and not mutated, so can very smoothly by
Thicker pad is transitioned into thinner cabling；In the view field of surface-mount type radio-frequency maser, corresponding reference planes layer does not inside contract,
Ensure the impedance continuity of pad.
Brief description of the drawings
Fig. 1 is the cabling optimization method flow chart of Surface Mount radio-frequency maser provided in an embodiment of the present invention；
Fig. 2 and Fig. 3 is the cabling optimization method application schematic diagram of Surface Mount radio-frequency maser provided in an embodiment of the present invention；
Fig. 4 is the cabling optimization method of Surface Mount radio-frequency maser provided in an embodiment of the present invention and the return loss curve of conventional method
Figure.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein
Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that for the ease of retouching
State, part related to the present invention rather than full content are illustrate only in attached drawing, it is unless otherwise defined, used herein all
Technical and scientific term is identical with the normally understood implication of those skilled in the art for belonging to the present invention.It is used herein
Term be intended merely to description specific embodiment, it is not intended that in limitation the present invention.
It refer to shown in Fig. 1, Fig. 1 is the cabling optimization method flow chart of Surface Mount radio-frequency maser provided in an embodiment of the present invention.
The cabling optimization method of Surface Mount radio-frequency maser specifically includes in the present embodiment：
S101, at the signal access pad of surface-mount type radio-frequency maser, empty neighboring reference plane, increase blank medium is thick
Degree.
For the optimization that signal access pad is wide, consider to improve its impedance, and 4 key elements related with impedance are distinguished
For line width, copper is thick, dielectric constant and dielectric thickness, that is, blank medium thickness, and line width, copper are thick, dielectric constant is designing lamination
And encapsulation decide after can not arbitrarily change, therefore the present invention from the angle of dielectric thickness to the impedance operator at radio-frequency maser
Optimize.Under normal circumstances, the Surface Mount pad of top layer with adjacent earth formations as a reference plane, blank medium thickness refers to top layer
With the thickness of the core plate or pp pieces (Pre-pregnant, prepreg) of the second layer, there is ground copper to join for radiofrequency signal in third layer
In the case of examining and flowing back, the copper sheet of second layer plane stratum pad view field is dug up, and judge whether impedance reaches setting
It is required that if impedance is not up to sets requirement, the correspondence copper sheet of third layer is dug up, with reference to the 4th layer, then judges that impedance is
It is no to reach sets requirement, and so on, until impedance meets sets requirement.As shown in Fig. 2, three white rectangles are Surface Mount in figure
Three Surface Mount pads of radio-frequency maser, centre are signal pin, solid black line for cabling, be adjacent layer horizontal line shape with reference to copper sheet
(figure is the Overlapping display of top layer and adjacent plane, and pad is top layer with cabling, and horizontal line shape copper sheet is adjacent layer in region
).
S102, the transition for wide pad to thin cabling, the cabling of extraction take gradual change cabling.
Gradual change cabling causes impedance persistently to change, and not mutated, so can be very smoothly by thicker pad transition
To thinner cabling, and by radio-frequency maser signal pin there are anti-pad, therefore from the cabling of the disk just out without reference to flat
Face, the herein different normal cabling for having reference planes with backward of the impedance computation mode of cabling, therefore use thicker cabling
Mode also can reach certain impedance-compensated effect.As shown in figure 3, in the place of intermediate contact pads to cabling, one is added gradually
The region of change, i.e., slowly attenuated by width, rather than has thick pad mutation to thin line width；In addition, the picture of neighboring reference layer
Edges of boards are extended to, it is concordant with signal pad；The view field of adjacent layer signal pin empties, and one below pad layer empties
(not shown).
S103, the view field in surface-mount type radio-frequency maser, corresponding reference planes layer do not inside contract.
In the radio-frequency maser Surface Mount Pan Chu of edges of boards, to ensure the integrality of reference planes, no longer inside contract, so as to improve its impedance
Continuity.
The situation of signal reflex in return loss indication circuit, return loss is smaller, and signal reflex is smaller, it is intended that signal is transmitting
The reflection of Shi Fasheng is more few better.Impedance mismatch can aggravate the reflection of signal, cause return loss to become larger.Therefore the return loss measured is got over
It is small, represent that impedance uniformity is better.As shown in figure 4, Fig. 4 is the cabling optimization side of Surface Mount radio-frequency maser provided in an embodiment of the present invention
The return loss curve map of method and conventional method, transverse axis is frequency in figure, and the longitudinal axis is return loss size, before unit dB, A line represent optimization
Return loss curve, B lines are represented using the return loss curve after present invention optimization.
Technical scheme empties neighboring reference plane, increase reference at the Surface Mount pad of surface-mount type radio-frequency maser
Dielectric thickness, improves impedance, improves impedance operator；Transition for wide pad to thin cabling, the cabling of extraction are adopted
Take gradual change cabling so that impedance persistently changes, and not mutated, so can be smoothly transitioned into by thicker pad very much thinner
Cabling；In the view field of surface-mount type radio-frequency maser, corresponding reference planes layer does not inside contract, and ensures that the impedance of pad is continuous
Property.It should be noted that the Surface Mount radio-frequency maser can be Surface Mount Surface Mount radio-frequency maser in the present embodiment, but the application of the present invention
It is not limited thereto, other Surface Mount radio-frequency masers or surface mounting component pad are equally applicable to be used for technical scheme.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (3)
- A kind of 1. cabling optimization method of Surface Mount radio-frequency maser, it is characterised in that including：S101, at the Surface Mount pad of surface-mount type radio-frequency maser, empty neighboring reference plane, increase blank medium thickness；S102, the transition for wide pad to thin cabling, the cabling of extraction take gradual change cabling；S103, the view field in surface-mount type radio-frequency maser, corresponding reference planes layer do not inside contract.
- 2. the cabling optimization method of Surface Mount radio-frequency maser according to claim 1, it is characterised in that join in the step S101 Examine dielectric thickness refer to the Surface Mount pad of top layer with adjacent earth formations as a reference plane, the core plate or pp pieces of top layer and the second layer Thickness；Described to empty neighboring reference plane, increase blank medium thickness includes：Third layer have ground copper for radiofrequency signal reference and In the case of reflux, the copper sheet of second layer plane stratum pad view field is dug up, and judge whether impedance reaches sets requirement.
- 3. the cabling optimization method of Surface Mount radio-frequency maser according to claim 2, it is characterised in that the step S101 is also wrapped Include：If impedance is not up to sets requirement, the correspondence copper sheet of third layer is dug up, with reference to the 4th layer, then whether judges impedance Reach sets requirement, and so on, until impedance meets sets requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214618.8A CN107995774A (en) | 2017-11-28 | 2017-11-28 | A kind of cabling optimization method of Surface Mount radio-frequency maser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214618.8A CN107995774A (en) | 2017-11-28 | 2017-11-28 | A kind of cabling optimization method of Surface Mount radio-frequency maser |
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| CN107995774A true CN107995774A (en) | 2018-05-04 |
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| CN201711214618.8A Pending CN107995774A (en) | 2017-11-28 | 2017-11-28 | A kind of cabling optimization method of Surface Mount radio-frequency maser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108733956A (en) * | 2018-05-30 | 2018-11-02 | 郑州云海信息技术有限公司 | A method of impedance discontinuity at optimization high-speed link capacitance |
| CN110602868A (en) * | 2019-08-16 | 2019-12-20 | 武汉光迅信息技术有限公司 | Flexible circuit board and corresponding optical module |
| CN110996505A (en) * | 2019-12-31 | 2020-04-10 | 联想(北京)有限公司 | Printed circuit board and electronic equipment |
| CN113392613A (en) * | 2020-03-13 | 2021-09-14 | 浙江宇视科技有限公司 | Circuit board wiring method, system and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365291A (en) * | 2007-03-23 | 2009-02-11 | 华为技术有限公司 | Printed circuit board, design method thereof and terminal product main board |
| CN203734916U (en) * | 2014-01-26 | 2014-07-23 | 深圳市兴森快捷电路科技股份有限公司 | Surface-mounted SMA connector wiring base on control edge |
| CN205912336U (en) * | 2016-07-19 | 2017-01-25 | 无锡军安电子科技有限公司 | Line knot that walks who cut straightly type radio frequency connector constructs |
-
2017
- 2017-11-28 CN CN201711214618.8A patent/CN107995774A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101365291A (en) * | 2007-03-23 | 2009-02-11 | 华为技术有限公司 | Printed circuit board, design method thereof and terminal product main board |
| CN203734916U (en) * | 2014-01-26 | 2014-07-23 | 深圳市兴森快捷电路科技股份有限公司 | Surface-mounted SMA connector wiring base on control edge |
| CN205912336U (en) * | 2016-07-19 | 2017-01-25 | 无锡军安电子科技有限公司 | Line knot that walks who cut straightly type radio frequency connector constructs |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108733956A (en) * | 2018-05-30 | 2018-11-02 | 郑州云海信息技术有限公司 | A method of impedance discontinuity at optimization high-speed link capacitance |
| CN108733956B (en) * | 2018-05-30 | 2021-11-02 | 郑州云海信息技术有限公司 | Method for optimizing impedance discontinuity at high-speed link capacitor |
| CN110602868A (en) * | 2019-08-16 | 2019-12-20 | 武汉光迅信息技术有限公司 | Flexible circuit board and corresponding optical module |
| CN110996505A (en) * | 2019-12-31 | 2020-04-10 | 联想(北京)有限公司 | Printed circuit board and electronic equipment |
| CN113392613A (en) * | 2020-03-13 | 2021-09-14 | 浙江宇视科技有限公司 | Circuit board wiring method, system and device |
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Application publication date: 20180504 |