CN205584139U - Low -noise amplifier - Google Patents
Low -noise amplifier Download PDFInfo
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- CN205584139U CN205584139U CN201620355528.5U CN201620355528U CN205584139U CN 205584139 U CN205584139 U CN 205584139U CN 201620355528 U CN201620355528 U CN 201620355528U CN 205584139 U CN205584139 U CN 205584139U
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- power supply
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Abstract
The utility model discloses a low -noise amplifier, including input stage circuit, filter circuit, amplifier circuit, buffer circuit and the output filter circuit who connects gradually, the last bias circuit that is connected with of amplifier circuit, bias circuit includes triode, a DC power supply and the 2nd DC power supply, the base of triode link to each other through a first resistance and a DC power supply and the base on be connected with the second resistance of ground connection, the transmission collection of triode passes through third resistance and a DC power supply links to each other and the collecting electrode links to each other through the fourth resistance of establishing ties and the 5th resistance and the 2nd DC power supply, be connected with a decoupling circuit and the 2nd decoupling circuit on a DC power supply and the 2nd DC power supply respectively, it adopts the dual supply for bias circuit's flexibility is high, improves the gain and the noise coefficient of amplifier, avoids the production of self excitation.
Description
Technical field
This utility model relates to field of communication devices, is specifically related to a kind of low-noise amplifier.
Background technology
Along with construction and the development of global satellite system, satellite navigation system is applied in multiple field such as scientific research, automobile and fishery, military affairs etc., but satellite-signal amplitude is low, and complicated electromagnetic environment is often disturbed or affects the use of reception equipment.Low-noise amplifier, as the Primary Component of radio-frequency front-end, has vital effect.And biasing circuit is the pith in low noise amplifier circuit, it makes transistor be in magnifying state in amplifying circuit, and reasonably biasing can make transistor be operated in optimum state.Existing biasing circuit, uses single supply self-sufficiency biasing, and it lacks motility, affects gain and the noise coefficient of amplifier, be also easily generated self-excitation.
Utility model content
This utility model provides a kind of low-noise amplifier to solve above-mentioned technical problem, and it uses dual power supply so that the motility of biasing circuit is high, improves gain and the noise coefficient of amplifier, it is to avoid the generation of self-excitation.
This utility model is achieved through the following technical solutions:
Low-noise amplifier, including the input stage circuit being sequentially connected with, filter circuit, amplifying circuit, isolation circuit and output filter circuit, connect on described amplifying circuit and have biasing circuit, described biasing circuit includes audion, first DC source and the second DC source, the base stage of described audion is connected by the first resistance and the first DC source and connects in base stage the second resistance of ground connection, the transmitting collection of described audion is connected by the 3rd resistance and the first DC source and colelctor electrode is connected by the 4th resistance connected and the 5th resistance and the second DC source, the first decoupling circuit and the second decoupling circuit it is connected on described first DC source and the second DC source.Amplifying circuit is sent to after the filtered circuit filtering of radiofrequency signal that input stage circuit receives, radiofrequency signal amplified filtering output, to isolate circuit and radiofrequency signal is isolated, when amplifying circuit normally works, biasing circuit provides bias voltage to transistor.Biasing circuit of the present utility model uses dual power source structure so that circuit has motility, improves gain and the noise coefficient of amplifier, it is to avoid the generation of self-excitation；And use direct current biasing feedback control technology, can avoid the change of the factors such as temperature that circuit performance is impacted.First DC source and the second DC source are connected to the first decoupling circuit and the second decoupling circuit, can effectively reduce the noise that DC bias circuit is introduced, improve the noiseproof feature of low-noise amplifier.
As preferably, described audion is PNP type triode.
Further, described first decoupling circuit is the first electric capacity of ground connection.
Further, described second decoupling circuit is the second electric capacity of ground connection.
As preferably, the common port of described 4th resistance and the 5th resistance connects the 3rd electric capacity having ground connection.
As preferably, the upper connection of collection of launching of described audion has the 4th electric capacity of ground connection.
This utility model compared with prior art, at least has such advantages as and beneficial effect:
1, its biasing circuit of this utility model low-noise amplifier uses dual power source structure, can be effectively improved the motility of circuit, improves gain and the noise coefficient of amplifier, it is to avoid the generation of self-excitation.
2, this utility model uses DC feedback to control, and it can avoid the factors such as temperature to change the impact causing circuit performance, improves the stability of circuit.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by this utility model embodiment, constitutes the part of the application, is not intended that the restriction to this utility model embodiment.In the accompanying drawings:
Fig. 1 is the circuit theory diagrams of biasing circuit of the present utility model.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, exemplary embodiment of the present utility model and explanation thereof are only used for explaining this utility model, are not intended as restriction of the present utility model.
Embodiment
A kind of low-noise amplifier as shown in Figure 1, including the input stage circuit being sequentially connected with, filter circuit, amplifying circuit, isolation circuit and output filter circuit, connect on described amplifying circuit and have biasing circuit, described biasing circuit includes audion T, first DC source V1 and the second DC source V2, the base stage of described audion T is connected by the first resistance R1 and the first DC source V1 and connects in base stage the second resistance R2 of ground connection, the transmitting collection of described audion T is connected by the 3rd resistance R3 and the first DC source V1 and colelctor electrode is connected by the 4th resistance R4 and the 5th resistance R5 and the second DC source V2 of series connection, it is connected to the first decoupling circuit and the second decoupling circuit on described first DC source V1 and the second DC source V2.
Described audion is PNP type triode.
Described first decoupling circuit is the first electric capacity C1 of ground connection.
Described second decoupling circuit is the second electric capacity C2 of ground connection.
The common port of described 4th resistance R4 and the 5th resistance R5 connects the 3rd electric capacity C3 having ground connection.
The upper connection of collection of launching of described audion T has the 4th electric capacity C4 of ground connection.
The transmitting of the audion of biasing circuit of the present utility model integrates provides D-S voltage by external resistance as amplifying circuit transistor, and the common port of the 4th resistance and the 5th resistance provides G-S voltage for transistor.First DC source V1 and the second DC source V2 is respectively adopted direct-flow positive voltage and negative DC voltage, it uses direct current biasing feedback control, when variations in temperature makes the Ids of transistor increase, owing to the electric current of triode emission collection is the least, negligible, thus cause the first ohmically dividing potential drop to increase, transmitting collecting voltage diminishes, between base stage and transmitting collection, voltage diminishes, and then collector current is diminished, Vgs diminishes, according to the characteristic of amplifier tube, Vgs diminishes and causes Ids to diminish, hereby it is ensured that the stability of circuit.
Above-described detailed description of the invention; the purpose of this utility model, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only detailed description of the invention of the present utility model; it is not used to limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. done, within should be included in protection domain of the present utility model.
Claims (6)
1. low-noise amplifier, it is characterized in that: include the input stage circuit being sequentially connected with, filter circuit, amplifying circuit, isolation circuit and output filter circuit, connect on described amplifying circuit and have biasing circuit, described biasing circuit includes audion, first DC source and the second DC source, the base stage of described audion is connected by the first resistance and the first DC source and connects in base stage the second resistance of ground connection, the transmitting collection of described audion is connected by the 3rd resistance and the first DC source and colelctor electrode is connected by the 4th resistance connected and the 5th resistance and the second DC source, the first decoupling circuit and the second decoupling circuit it is connected on described first DC source and the second DC source.
Low-noise amplifier the most according to claim 1, it is characterised in that: described audion is PNP type triode.
Low-noise amplifier the most according to claim 2, it is characterised in that: described first decoupling circuit is the first electric capacity of ground connection.
Low-noise amplifier the most according to claim 2, it is characterised in that: described second decoupling circuit is the second electric capacity of ground connection.
Low-noise amplifier the most according to claim 1, it is characterised in that: the common port of described 4th resistance and the 5th resistance connects the 3rd electric capacity having ground connection.
Low-noise amplifier the most according to claim 1, it is characterised in that: the upper connection of collection of launching of described audion has the 4th electric capacity of ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620355528.5U CN205584139U (en) | 2016-04-26 | 2016-04-26 | Low -noise amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620355528.5U CN205584139U (en) | 2016-04-26 | 2016-04-26 | Low -noise amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205584139U true CN205584139U (en) | 2016-09-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620355528.5U Expired - Fee Related CN205584139U (en) | 2016-04-26 | 2016-04-26 | Low -noise amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205584139U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603023A (en) * | 2016-12-15 | 2017-04-26 | 中国电子科技集团公司第四十研究所 | Dual-power power amplifier circuit |
| CN107947790A (en) * | 2017-12-15 | 2018-04-20 | 成都爱科特科技发展有限公司 | A kind of thin stepping low noise frequency source in broadband |
-
2016
- 2016-04-26 CN CN201620355528.5U patent/CN205584139U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603023A (en) * | 2016-12-15 | 2017-04-26 | 中国电子科技集团公司第四十研究所 | Dual-power power amplifier circuit |
| CN106603023B (en) * | 2016-12-15 | 2020-01-21 | 中国电子科技集团公司第四十一研究所 | Dual-power amplifier circuit |
| CN107947790A (en) * | 2017-12-15 | 2018-04-20 | 成都爱科特科技发展有限公司 | A kind of thin stepping low noise frequency source in broadband |
| CN107947790B (en) * | 2017-12-15 | 2023-10-03 | 成都爱科特科技发展有限公司 | Broadband fine stepping low-noise frequency source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 Termination date: 20200426 |