CN102291089B - Method for solving self-excitation of low-noise amplifying circuit and amplifier - Google Patents
Method for solving self-excitation of low-noise amplifying circuit and amplifier Download PDFInfo
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- CN102291089B CN102291089B CN2011101086190A CN201110108619A CN102291089B CN 102291089 B CN102291089 B CN 102291089B CN 2011101086190 A CN2011101086190 A CN 2011101086190A CN 201110108619 A CN201110108619 A CN 201110108619A CN 102291089 B CN102291089 B CN 102291089B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001228 spectrum Methods 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of low-noise amplifying circuits, and discloses a method for solving self-excitation of a low-noise amplifying circuit. The method comprises the following steps of: (1) arranging a circuit board with the low-noise amplifying circuit in an accommodating cavity; (2) arranging a metal member in the accommodating cavity and closing a cover plate; (3) connecting an output end of the low-noise amplifying circuit to frequency spectrum testing equipment; (4) adjusting the position of the metal member in the accommodating cavity and powering up the low-noise amplifying circuit; and (5) repeating the operation of the step (4) until the level caused by self-excitation in the frequency spectrum testing equipment is eliminated. In the invention, the self-excitation generated by the circuit board is easily eliminated by arranging the metal member in the accommodating cavity at low cost; and a proper position of the metal member in the accommodating cavity is easily and conveniently determined by continuously debugging the position of the metal member in the accommodating cavity and through the effect of external frequency spectrum testing equipment. The invention also provides an amplifier which comprises the circuit board made by using the method.
Description
Technical field
The present invention relates to the technical field of low noise amplifier circuit, especially a kind of method of solving self-excitation of low-noise amplifying circuit and the amplifier that comprises the circuit board designed according to the method.
Background technology
In existing communication system, low noise amplifier circuit (LNA) is basic module common in communication equipment, and in order to reduce the electromagnetic interference between each functional module, the circuit board that is provided with low noise amplifier circuit often needs to be contained in a metallic cavity, so that itself and other module is kept apart, but, because the inwall of metallic cavity has reflection and scattering to electromagnetic wave, and the intrinsic electromagnetic resonance of the metallic cavity of various shapes itself, the output that can change the low noise amplifier circuit in circuit board feeds back to amplitude and the phase place of input end signal, thereby make low noise amplifier circuit produce self-excitation.
Summary of the invention
The object of the present invention is to provide a kind of method of solving self-excitation of low-noise amplifying circuit, the low noise amplifier circuit that is intended to solve in the available circuit plate is put into the rear problem that easily produces self-excitation of metallic cavity.
The present invention is achieved in that a kind of method of solving self-excitation of low-noise amplifying circuit, comprises the following steps:
The circuit board that 1) will have a low noise amplifier circuit is placed in the containing cavity of metallic cavity;
2) place metalwork in described containing cavity, and at described metallic cavity upper cover upper cover plate, closed metal cavity;
3) output of the low noise amplifier circuit in described circuit board is connected in to extraneous spectrum measurement equipment;
4) open described cover plate, adjust the position of described metalwork in described containing cavity, again cover described cover plate, and power up to described low noise amplifier circuit;
5) repeatedly carry out step 4) operation, until the level produced due to described low noise amplifier circuit self-excitation in the spectrum measurement equipment in the described external world is eliminated, determine the position of described metalwork in described containing cavity.
As the further optimization to technique scheme, after determining the position of described metalwork in described containing cavity, that metalwork and metallic cavity is one-body molded.
The present invention also provides a kind of amplifier, and this amplifier comprises the circuit board by the said method design.
The present invention realizes like this, a kind of amplifier, comprise metallic cavity, the circuit board with low noise amplifier circuit with containing cavity and can be placed on described metallic cavity and seal the cover plate of described containing cavity, described circuit board is placed in described containing cavity, is placed with at least one metalwork in described containing cavity.
Further, the manufacture that is formed in one of described metallic cavity and described metalwork, described metallic object is erected in described containing cavity, and is arranged in described circuit board.
Further, the upper surface of described metalwork is connected to the inner surface of described cover plate.
Further, described low noise amplifier circuit has the micro-belt path with one or more levels amplifier tube, and described metalwork departs from described micro-belt path.
Further, one side of described metallic cavity has the input channel be connected with described circuit board for extraneous input unit, described input channel is communicated with described containing cavity, an and end of the described micro-belt path of aliging, the opposite side of described metallic cavity has the output channel be connected with affiliated circuit board for extraneous output device, described output channel is communicated with described containing cavity, and the other end of the described micro-belt path of aliging.
Further, described metalwork is metal column or metal.
Further, also comprise for connecting the securing member of described metallic cavity and described cover plate.
Compared with prior art, the present invention places metalwork by the containing cavity in metallic cavity and eliminates the self-excitation that the circuit board low noise amplifier circuit produces, simple and cost is low, in operating process, by the position of continuous debugging metalwork in containing cavity, and, by the effect of extraneous spectrum measurement equipment, to determine the appropriate position of metalwork at containing cavity, it is simple to operate and convenient.
The accompanying drawing explanation
Fig. 1 is the assembling schematic perspective view of the embodiment of the present invention circuit board, metallic cavity and the metalwork that provide;
Fig. 2 is the metallic cavity that provides of the embodiment of the present invention and the assembling schematic perspective view of metalwork;
Fig. 3 is the schematic perspective view of the circuit board that provides of the embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The invention provides a kind of method of solving self-excitation of low-noise amplifying circuit, comprise the following steps:
The circuit board that 1) will have a low noise amplifier circuit is placed in the containing cavity of metallic cavity;
2) place metalwork in described containing cavity, and at described metallic cavity upper cover upper cover plate, closed metal cavity;
3) output of the low noise amplifier circuit in described circuit board is connected in to extraneous spectrum measurement equipment;
4) open described cover plate, adjust the position of described metalwork in described containing cavity, again cover described cover plate, and power up to described low noise amplifier circuit;
5) repeatedly carry out step 4) operation, until the level produced due to described low noise amplifier circuit self-excitation in the spectrum measurement equipment in the described external world is eliminated, determine the position of described metalwork in described containing cavity.
In the present invention, place metalwork by the containing cavity in metallic cavity and eliminate the self-excitation that the circuit board low noise amplifier circuit produces, simple and cost is low, in operating process, by the position of continuous debugging metalwork in containing cavity, and, by the effect of extraneous spectrum measurement equipment, to determine the appropriate position of metalwork at containing cavity, it is simple to operate and convenient.
Below in conjunction with concrete accompanying drawing, realization of the present invention is described in detail.
As shown in Figures 1 to 3, be a preferred embodiment provided by the invention.
In the present invention, circuit board 12 comprises the low noise amplifier circuit with the low noise amplification function, for make low noise amplifier circuit in this circuit board 12 not with other module generation electromagnetic interference problem, this circuit board 12 is placed in a metallic cavity 11 with containing cavity 111, cover again a cover plate (not marking in figure) on this metallic cavity 11, make circuit board 12 be sealed in the containing cavity 111 of metallic cavity 11, certainly, in order to make the low noise amplifier circuit that is placed on the circuit board 12 in metallic cavity 11 not there will be self-excitation, it is the spontaneous abnormal rising of certain quantity of state in low noise amplifier circuit.
In the present invention, for fear of low noise amplifier circuit, produce self-excitation, adopt following method, the method comprises the following steps:
The circuit board 12 that 1) will have a low noise amplifier circuit is placed in the containing cavity 111 in metallic cavity 11, and this containing cavity 111 is a cavity of 11 in metallic cavity, and it is communicated in the external world;
2) place metalwork 112 in containing cavity 111, and at metallic cavity 11 upper cover upper cover plates, the containing cavity 111 of closed metal cavity 11, like this, due to adding of metalwork 112, changed the shape of metallic cavity 11 containing cavities 111, thereby the state of reflection of electromagnetic wave or scattering changes, and adding due to metalwork 112, changed the natural resonance frequency of metallic cavity 11 containing cavities 111, thereby change amplitude and phase place between low noise amplifier circuit feedback signal and input signal, destroy the condition that produces self-excitation, self-excitation is disappeared;
3) output of the low noise amplifier circuit in circuit board 12 is connected in to extraneous spectrum measurement equipment, like this, after powering up to low noise amplifier circuit, the user can see from extraneous spectrum measurement equipment whether low noise amplifier circuit self-excitation occurs intuitively, if self-excitation occurs for it, there will be the level produced due to self-excitation on extraneous spectrum measurement equipment;
4) open the cover plate on metallic cavity 11, adjust the position of metalwork 112 in containing cavity 111, cover cover plate, and power up to low noise amplifier circuit, observe in extraneous spectrum measurement equipment and the level produced due to the low noise amplifier circuit self-excitation whether occurs;
5) repeatedly carry out step 4) operation, until not there will be the level produced due to the low noise amplifier circuit self-excitation on extraneous spectrum display apparatus, the level produced due to the low noise amplifier circuit self-excitation is eliminated, thereby determines the position of metalwork 112 in containing cavity 111.
In above-mentioned steps 4) in, the user adjusts being operating as of the position of metalwork 112 in containing cavity 111: the user opens the cover plate covered on metallic cavity 11, manually move the metalwork 112 be placed in containing cavity 111, make the change in location of metalwork 112 in containing cavity 111, then, the user covers cover plate, and power up to low noise amplifier circuit, then observe the level of extraneous spectrum measurement equipment, if there is no to occur the level produced due to self-excitation, determined the position of metalwork 112, if continue, the level produced due to self-excitation is arranged, continue according to above-mentioned operating process, adjust the position of metalwork 112 in containing cavity 111.
Like this, the user is by constantly adjusting the position of metalwork 112 in containing cavity 111, in containing cavity 111 when metalwork 112 in metallic cavity 11 when appropriate position, the self-excitation phenomena of low noise amplifier circuit can be eliminated, thereby, the self-excitation that the user can produce with the low noise amplifier circuit reached in elimination circuit board 12 by the position of continuous adjustment metalwork 112.
After above-mentioned five steps, determine that metalwork 112 is placed on the position of the containing cavity 111 in metallic cavity 11, the user can process the metallic cavity 11 with the metalwork 112 of determining position, can reduce the cost of artificial installation, avoid occurring that the situation of neglected loading or wrongly installed metalwork 112 appears in the individual in practical operation, moreover, can produce in batch, enhance productivity.
The present invention also provides a kind of amplifier, this amplifier comprises the circuit board 12 according to above-mentioned method design, be that it comprises metallic cavity 11 with containing cavity 111, is placed on circuit board 12 in containing cavity 111, is placed on the metalwork 112 in containing cavity 111 and can be placed on metallic cavity 11 and the cover plate of sealing containing cavity 111, there is low noise amplifier circuit in this circuit board 12, like this, metalwork 112 in circuit board 12 has changed the structure of metallic cavity 11, and it can eliminate the self-excitation of low noise amplifier circuit in this amplifier.
For the manufacturing cost of step-down amplifier and the manufacture efficiency that improves amplifier, the metallic cavity 11 of this amplifier and metalwork 112 are one of the forming and make, and this metalwork 112 is erected in the containing cavity 111 in metallic cavity 11, and through circuit board 12.
In order to make better isolating electromagnetic of this amplifier, better eliminate the self-excitation phenomena of low noise amplifier circuit, the upper surface of this metalwork 112 is connected on the inner surface of cover plate, guarantees that the height of metalwork 112 is consistent with the degree of depth of containing cavity 111.
In the present embodiment, the low noise amplifier circuit in amplifier has the micro-belt path 121 with one or more levels amplifier tube, and metalwork 112 departs from this micro-belt path 121.
For make this circuit board 12 can with extraneous equipment connection, one side of this metallic cavity 11 has input channel 113, this input channel 113 is communicated with the containing cavity 111 of this metallic cavity 11, one end of its micro-belt path 121 of aliging, its opposite side has output channel 114, this output channel 114 is communicated with the containing cavity 111 of this metallic cavity 11, and the other end of micro-belt path 121 of aliging, like this, extraneous input unit can be connected to by input channel 113 end of micro-belt path 121, extraneous output device can be connected to by output channel 114 other end of micro-belt path 121, thereby realize the conducting of low noise amplifier circuit, and then this circuit board 12 can be worked.
In the present embodiment, described metalwork 112 can be metal column or bonding jumper.Certainly, can be also other various shapes, the user can arrange concrete shape and the quantity of metalwork 112 according to actual needs, and they can be for one or more of.
More firm in order to make metalwork 112 be connected with cover plate, the better closed metal cavity 11 of cover plate, this amplifier also comprises securing member, this securing member is connected in cover plate and metallic cavity 11, make between the two connect more firm, thereby also firm being connected on metalwork 112 of cover plate.
Particularly, this securing member is screw, cover plate is provided with first screw that can match with this screw, accordingly, have second screw corresponding with this first screw on metallic cavity, this second screw also can match with screw, thereby, screw is by the first screw and the second screw, by cover plate and firm the coupling together of metalwork 112.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the method for a solving self-excitation of low-noise amplifying circuit, is characterized in that, comprises the following steps:
The circuit board that 1) will have a low noise amplifier circuit is placed in the containing cavity of metallic cavity, and described low noise amplifier circuit has micro-belt path of one or more levels amplifier tube;
2) place metalwork in described containing cavity, described metalwork departs from described micro-belt path, and at described metallic cavity upper cover upper cover plate, closed metal cavity;
3) output of the low noise amplifier circuit in described circuit board is connected in to extraneous spectrum measurement equipment;
4) open described cover plate, adjust the position of described metalwork in described containing cavity, again cover described cover plate, and power up to described low noise amplifier circuit;
5) repeatedly carry out the operation of step 4), until the level produced due to described low noise amplifier circuit self-excitation in the spectrum measurement equipment in the described external world is eliminated, determine the position of described metalwork in described containing cavity.
2. the method for a kind of solving self-excitation of low-noise amplifying circuit as claimed in claim 1, is characterized in that, after determining the position of described metalwork in described containing cavity, that metalwork and metallic cavity is one-body molded.
3. an amplifier, comprise metallic cavity, the circuit board with low noise amplifier circuit with containing cavity and can be placed on described metallic cavity and seal the cover plate of described containing cavity, described circuit board is placed in described containing cavity, it is characterized in that, be placed with at least one metalwork in described containing cavity, described low noise amplifier circuit has the micro-belt path with one or more levels amplifier tube, and described metalwork departs from described micro-belt path.
4. a kind of amplifier as claimed in claim 3, is characterized in that, the manufacture that is formed in one of described metallic cavity and described metalwork, and described metalwork is erected in described containing cavity, and is arranged in described circuit board.
5. a kind of amplifier as claimed in claim 4, is characterized in that, the upper surface of described metalwork is connected to the inner surface of described cover plate.
6. a kind of amplifier as claimed in claim 3, it is characterized in that, one side of described metallic cavity has the input channel be connected with described circuit board for extraneous input unit, described input channel is communicated with described containing cavity, an and end of the described micro-belt path of aliging, the opposite side of described metallic cavity has the output channel be connected with described circuit board for extraneous output device, and described output channel is communicated with described containing cavity, and the other end of the described micro-belt path of aliging.
7. as claim 3 or 4 or 5 described a kind of amplifiers, it is characterized in that, described metalwork is metal column or bonding jumper.
8. as claim 3 or 4 or 5 described a kind of amplifiers, it is characterized in that, also comprise for connecting the securing member of described metallic cavity and described cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101086190A CN102291089B (en) | 2011-04-28 | 2011-04-28 | Method for solving self-excitation of low-noise amplifying circuit and amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101086190A CN102291089B (en) | 2011-04-28 | 2011-04-28 | Method for solving self-excitation of low-noise amplifying circuit and amplifier |
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| Publication Number | Publication Date |
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| CN102291089A CN102291089A (en) | 2011-12-21 |
| CN102291089B true CN102291089B (en) | 2013-12-04 |
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| CN2011101086190A Expired - Fee Related CN102291089B (en) | 2011-04-28 | 2011-04-28 | Method for solving self-excitation of low-noise amplifying circuit and amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106937019B (en) * | 2017-03-31 | 2019-12-13 | 贵州航天电子科技有限公司 | video signal amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813728A (en) * | 2009-02-23 | 2010-08-25 | 深圳易拓科技有限公司 | Electromagnetic interference detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778018B2 (en) * | 2001-07-16 | 2004-08-17 | Koninklijke Philips Electronics N.V. | Linear power amplifier |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813728A (en) * | 2009-02-23 | 2010-08-25 | 深圳易拓科技有限公司 | Electromagnetic interference detection device |
Non-Patent Citations (2)
| Title |
|---|
| 放大器干扰、噪声抑制和自激振荡的消除;赵红梅等;《平顶山师专学报》;平顶山工学院;20021031;第17卷(第5期);第35页第3节 * |
| 赵红梅等.放大器干扰、噪声抑制和自激振荡的消除.《平顶山师专学报》.平顶山工学院,2002,第17卷(第5期),第35页第3节. |
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Granted publication date: 20131204 Termination date: 20160428 |