CN205509981U - Low noise amplifier circuit with strong anti -interference ability - Google Patents
Low noise amplifier circuit with strong anti -interference ability Download PDFInfo
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- CN205509981U CN205509981U CN201620242931.7U CN201620242931U CN205509981U CN 205509981 U CN205509981 U CN 205509981U CN 201620242931 U CN201620242931 U CN 201620242931U CN 205509981 U CN205509981 U CN 205509981U
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Abstract
The utility model relates to a low noise amplifier circuit with strong anti -interference ability, include high power amplifier, its input links to each other with the input of switch filtering ware as low noise amplifier circuit 's input, its output, and the output of switch filtering ware is as the output that hangs down noise amplifier circuit, the switch filtering ware comprises preceding stage switch, two at least wave filters and a back level switch, and the output of preceding stage switch links to each other with the input of every wave filter respectively, and the output of every wave filter all concatenates amplitude limiting protector and low -noise amplifier in proper order, and every low -noise amplifier's output is all continuous with the input of back level switch. The utility model discloses having the very strong inside and outside ability of disturbing of frequency bandwidth of resisting, having fairly low noise coefficient simultaneously, it is higher and often will be in the face of interfering signal's microwave receiving system to be applicable to sensitivity.
Description
Technical field
This utility model relates to microwave system integrated technology field, a kind of low noise amplifier circuit with strong anti-interference ability.
Background technology
At present, do not add the low noise amplifier circuit of anti-jamming circuit as shown in Figure 1, the jamproof realization of commonly used low noise amplifier circuit of existing microwave receiving front end has two ways: first kind of way adds antiblocking wave filter at input, as in figure 2 it is shown, this mode can effectively reduce the interference signal outside effective frequency bandwidth；The second way adds switched filter circuit at input, as it is shown on figure 3, this mode can reduce outside effective frequency bandwidth and effective frequency bandwidth in interference.
In first kind of way, at X-band, the wave filter being newly added is if bandwidth 100MHz, point ± 100MHz centered by inhibition point, then insertion loss is about 2.5dB, use same filter calculated below, and now noise coefficient is 4.5dB.In the second way, by add switch be six select a switch as a example by, one switch insertion loss be about 2.3dB, then noise coefficient is 9.1dB.Visible, regardless of which kind of mode, owing to adding switch, narrow band filter, cause the basic performance indications " noise coefficient " as low noise amplifier circuit to deteriorate, the especially second way, becoming apparent from of deterioration.
Utility model content
The purpose of this utility model is to provide a kind of while solving frequency bandwidth internal interference, it is possible to the deterioration of noise-reduction coefficient, allows reception system jamproof while, can still have the low noise amplifier circuit with strong anti-interference ability of preferable sensitivity.
For achieving the above object, this utility model have employed techniques below scheme: a kind of low noise amplifier circuit with strong anti-interference ability, including high power amplifier, its input is as the input of low noise amplifier circuit, its outfan is connected with the input of switch filter, and the outfan of switch filter is as the outfan of low noise amplifier circuit；Described switch filter is made up of prime switch, at least two wave filter and rear class switch; the outfan input with each wave filter respectively of prime switch is connected; the outfan of each wave filter is all sequentially connected in series limited amplitude protection device and low-noise amplifier, and the input that the outfan of each low-noise amplifier all switchs with rear class is connected.
Described wave filter, limited amplitude protection device, low-noise amplifier number consistent.
The input of described prime switch is connected with the outfan of high power amplifier; the outfan of described wave filter is connected with the input of limited amplitude protection device; the outfan of limited amplitude protection device is connected with the input of low-noise amplifier, and the outfan of described rear class switch is as the outfan of switch filter.
Described switch filter is six to select a switch filter.
As shown from the above technical solution, this utility model has the ability of the strongest opposing frequency bandwidth internal and external interference, has at a fairly low noise coefficient simultaneously, it is adaptable to sensitivity higher and often will in the face of interference signal microwave receiving system.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the low noise amplifier circuit not adding anti-jamming circuit；
Fig. 2 is the circuit structure diagram of the low noise amplifier circuit adding antiblocking wave filter；
Fig. 3 is the circuit structure diagram of the low noise amplifier circuit adding switch filter；
Fig. 4 is circuit structure diagram of the present utility model.
Detailed description of the invention
As shown in Figure 4, a kind of low noise amplifier circuit with strong anti-interference ability, including high power amplifier, its input is as the input of low noise amplifier circuit, its outfan is connected with the input of switch filter, and the outfan of switch filter is as the outfan of low noise amplifier circuit；Described switch filter is made up of prime switch, at least two wave filter and rear class switch; the outfan input with each wave filter respectively of prime switch is connected; the outfan of each wave filter is all sequentially connected in series limited amplitude protection device and low-noise amplifier, and the input that the outfan of each low-noise amplifier all switchs with rear class is connected.Described wave filter, limited amplitude protection device, low-noise amplifier number consistent.The input of described prime switch is connected with the outfan of high power amplifier; the outfan of described wave filter is connected with the input of limited amplitude protection device; the outfan of limited amplitude protection device is connected with the input of low-noise amplifier, and the outfan of described rear class switch is as the outfan of switch filter.
As shown in Figure 4, this utility model uses the mode that the high power amplifier of relatively low noise, switch filter, limited amplitude protection device and low-noise amplifier are used in combination, it is achieved that while solving frequency bandwidth internal interference, the deterioration of noise-reduction coefficient.While suppressing bandwidth internal and external interference, ensure that the undistorted amplification of useful signal, and achieve noise coefficient 3.85dB, be better than the first kind of way of interference outside the simply suppressing bandwidth shown in Fig. 2, be much better than shown in Fig. 3 can be with the second way of suppressing bandwidth internal and external interference.Switch filter shown in Fig. 4 is six to select a switch filter.
Below operation principle of the present utility model is further described:
It is anti-interference: after interference signal simultaneously enters circuit with effective small-signal, they are carried out undersaturated undistorted amplification by the high power amplifier of input together, signal after amplification enters prime switch, through prime switch after wave filter time, interference signal is filtered out, useful signal normal through, eventually pass through low-noise amplifier amplify output.If interference signal is the signal in frequency bandwidth, then selects different wave filter by switch, finds suitable wave filter filtering interference signals.nullSuch as one receives system，Input signal band a width of 6～12GHz，Six are used to select a switch filter in low noise amplifier circuit，Each wave filter is center frequency points F0 ± 0.5GHz with the most each wave filter of a width of 1GHz(by bandwidth)，Each wave filter can be to suppressing 40dB(such as 6～7GHz wave filter at off-center Frequency point 1～5GHz，Can be to 1～5GHz and 8～12GHz suppression 40dB)，Useful signal 6.2GHz now、Out-of-band interference signal 3GHz、Band internal interference signal 9GHz is simultaneously entered system，Select 6～7GHz filter channels，Useful signal 6.2GHz can be normal through，But out-of-band interference signal 3GHz、Band internal interference signal 9GHz can be suppressed by wave filter，Reach jamproof purpose.
Noise-reduction coefficient: this utility model reduces noise coefficient by two methods, first added high power amplifier before switch filter, effectively reduces the insertion loss impact on noise coefficient of switch filter；Secondly, after moving to low-noise amplifier after the rear class of switch filter being switched, carry out a step and decrease the impact on noise coefficient of the rear class switch.
In sum, this utility model has the ability of the strongest opposing frequency bandwidth internal and external interference, has at a fairly low noise coefficient simultaneously, it is adaptable to sensitivity higher and often will in the face of interference signal microwave receiving system.
Claims (4)
1. a low noise amplifier circuit with strong anti-interference ability, it is characterized in that: include high power amplifier, its input is as the input of low noise amplifier circuit, its outfan is connected with the input of switch filter, and the outfan of switch filter is as the outfan of low noise amplifier circuit；Described switch filter is made up of prime switch, at least two wave filter and rear class switch; the outfan input with each wave filter respectively of prime switch is connected; the outfan of each wave filter is all sequentially connected in series limited amplitude protection device and low-noise amplifier, and the input that the outfan of each low-noise amplifier all switchs with rear class is connected.
The low noise amplifier circuit with strong anti-interference ability the most according to claim 1, it is characterised in that: described wave filter, limited amplitude protection device, low-noise amplifier number consistent.
The low noise amplifier circuit with strong anti-interference ability the most according to claim 1; it is characterized in that: the input of described prime switch is connected with the outfan of high power amplifier; the outfan of described wave filter is connected with the input of limited amplitude protection device; the outfan of limited amplitude protection device is connected with the input of low-noise amplifier, and the outfan of described rear class switch is as the outfan of switch filter.
The low noise amplifier circuit with strong anti-interference ability the most according to claim 1, it is characterised in that: described switch filter is six to select a switch filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620242931.7U CN205509981U (en) | 2016-03-28 | 2016-03-28 | Low noise amplifier circuit with strong anti -interference ability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620242931.7U CN205509981U (en) | 2016-03-28 | 2016-03-28 | Low noise amplifier circuit with strong anti -interference ability |
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| Publication Number | Publication Date |
|---|---|
| CN205509981U true CN205509981U (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620242931.7U Active CN205509981U (en) | 2016-03-28 | 2016-03-28 | Low noise amplifier circuit with strong anti -interference ability |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941359A (en) * | 2017-01-12 | 2017-07-11 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The high-power low-noise reception front end of millimeter wave |
| CN113534092A (en) * | 2021-07-22 | 2021-10-22 | 宁波隔空智能科技有限公司 | Microwave radar power frequency filtering device and method |
-
2016
- 2016-03-28 CN CN201620242931.7U patent/CN205509981U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941359A (en) * | 2017-01-12 | 2017-07-11 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The high-power low-noise reception front end of millimeter wave |
| CN106941359B (en) * | 2017-01-12 | 2019-01-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The high-power low-noise reception front end of millimeter wave |
| CN113534092A (en) * | 2021-07-22 | 2021-10-22 | 宁波隔空智能科技有限公司 | Microwave radar power frequency filtering device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |