CN203406832U - Double-port input single-port output low-noise amplifier - Google Patents
Double-port input single-port output low-noise amplifier Download PDFInfo
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- CN203406832U CN203406832U CN201320421690.9U CN201320421690U CN203406832U CN 203406832 U CN203406832 U CN 203406832U CN 201320421690 U CN201320421690 U CN 201320421690U CN 203406832 U CN203406832 U CN 203406832U
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Abstract
The utility model discloses a double-port input single-port output low-noise amplifier. The double-port input single-port output low-noise amplifier comprises an A port input signal processing module, a B port input signal processing module and a high-low-pass combining filter. The A port input signal processing module and the B port input signal processing module respectively comprises a pre-level match circuit, a low-noise pre-level amplifying circuit, a post-level match circuit, a mirror image suppression filter and a low-noise post-level amplifying circuit, the signal input end of the pre-level match circuit is connected with an antenna and is connected with the high-low-pass combining filter through the low-noise pre-level amplifying circuit, the post-level match circuit, the mirror image suppression filter and the low-noise post-level amplifying circuit, and single-port signals are output. According to the double-port input single-port output low-noise amplifier, two routes of signals are combined through the high-low-pass combining filter to achieve single-port output, mutual influence of the low-noise amplifiers when the low-noise amplifiers are combined is avoided, and the phenomenon of deterioration of a noise factor is avoided. The mirror image suppression filter is arranged, mirror image interference can be effectively restrained, and stability of the double-port input single-port output low-noise amplifier is improved.
Description
Technical field
The utility model relates to a kind of low noise amplifier, particularly relates to a kind of dual-port input single port output low noise amplifier.
Background technology
Low noise amplifier is a very important part in the application such as Modern wireless communication, radar, electronic warfare system, is usually used in the front end of receiving system, suppresses noise jamming in amplifying signal, improves system sensitivity.If the front end in receiving system connects high performance low noise amplifier, the noise that suppresses late-class circuit, the noise factor of whole receiving system will depend primarily on the noise of amplifier, if the noise factor of low noise amplifier reduces, the noise factor of receiving system also can diminish, signal to noise ratio improves, and sensitivity also can improve greatly.
User usually wishes that the signal that many reception antennas receive can export by a port after low noise amplifier, conventional way is at the output of low noise amplifier, by two power splitters, as mixer, to realize single port to export, yet, because the isolation between two power splitter ports preferably also can only be accomplished 30dB left and right, isolation is lower, at low noise amplifier, close Lu Shihui and cause that noise factor worsens, in addition, in the time of the in the situation that of high-gain, owing to cannot effectively suppressing mirror image, disturb, cause its coefficient of stability low.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of dual-port input single port output low noise amplifier that noise factor is low is provided, it can effectively suppress mirror image and disturb, improve stability, multiple signals can be closed to road and realize single port output, and isolation is large, the phenomenon of having avoided low noise amplifier He road to cause noise factor to worsen.
The purpose of this utility model is achieved through the following technical solutions: a kind of dual-port input single port output low noise amplifier, and it comprises A port input signal processing module, B port input signal processing module and high low pass duplexer filter; A port input signal processing module is connected with antenna respectively with the signal input part of B port input signal processing module, A port input signal processing module and the signal output part of B port input signal processing module are connected respectively the signal input part of high low pass duplexer filter, and high low pass duplexer filter is outwards exported single-ended signal.
Further, described A port input signal processing module comprises prime match circuit A, low noise preamplifying circuit A, rear class match circuit A, image-reject filter A, low noise rear class amplifying circuit A, the signal input part of prime match circuit A is connected with antenna, and prime match circuit A is connected with high low pass duplexer filter Yi road signal input part by low noise preamplifying circuit A, rear class match circuit A, image-reject filter A, low noise rear class amplifying circuit A successively.
Further, described B port input signal processing module comprises prime match circuit B, low noise preamplifying circuit B, rear class match circuit B, image-reject filter B, low noise rear class amplifying circuit B, the signal input part of prime match circuit B is connected with antenna, and prime match circuit B is connected with another road signal input part of high low pass duplexer filter by low noise preamplifying circuit B, rear class match circuit B, image-reject filter B, low noise rear class amplifying circuit B successively.
The beneficial effects of the utility model are: be provided with image-reject filter, can effectively suppress mirror image and disturb, improve the stability of low noise amplifier; Adopt high low pass duplexer filter that two paths of signals is closed to road, realized single port output, also increased the isolation of low noise amplifier simultaneously, while effectively avoiding low noise amplifier He road, cause the generation of the phenomenons such as noise factor deterioration.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, a kind of dual-port input single port output low noise amplifier, it comprises A port input signal processing module, B port input signal processing module and high low pass duplexer filter.A port input signal processing module comprises prime match circuit A, low noise preamplifying circuit A, rear class match circuit A, image-reject filter A, low noise rear class amplifying circuit A, the signal input part of prime match circuit A is connected with antenna, and prime match circuit A is connected with high low pass duplexer filter Yi road signal input part by low noise preamplifying circuit A, rear class match circuit A, image-reject filter A, low noise rear class amplifying circuit A successively.B port input signal processing module comprises prime match circuit B, low noise preamplifying circuit B, rear class match circuit B, image-reject filter B, low noise rear class amplifying circuit B, the signal input part of prime match circuit B is connected with antenna, and prime match circuit B is connected with another road signal input part of high low pass duplexer filter by low noise preamplifying circuit B, rear class match circuit B, image-reject filter B, low noise rear class amplifying circuit B successively.
The utility model adopts high low pass duplexer filter that two-way input signal is closed to road and realizes single port output, impact each other while avoiding low noise amplifier He road.Because the Out-of-band rejection of high low pass can be adjusted by filter joint number, more than generally can accomplishing 40dB, make like this isolation addition between high low pass just can be greater than 80dB, isolation increases.Because the increase of isolation, can not cause noise factor to worsen during low noise amplifier He road.Due to the output of high low pass duplexer filter at low noise amplifier, even if changing, the loss of high low pass duplexer filter can not impact the noise factor of low noise amplifier yet.
Claims (3)
1. a dual-port input single port output low noise amplifier, is characterized in that: it comprises A port input signal processing module, B port input signal processing module and high low pass duplexer filter; A port input signal processing module is connected with antenna respectively with the signal input part of B port input signal processing module, A port input signal processing module and the signal output part of B port input signal processing module are connected respectively the signal input part of high low pass duplexer filter, and high low pass duplexer filter is outwards exported single-ended signal.
2. a kind of dual-port according to claim 1 is inputted single port output low noise amplifier, it is characterized in that: described A port input signal processing module comprises prime match circuit A, low noise preamplifying circuit A, rear class match circuit A, image-reject filter A and low noise rear class amplifying circuit A, the signal input part of prime match circuit A is connected with antenna, prime match circuit A is successively by low noise preamplifying circuit A, rear class match circuit A, image-reject filter A is connected with high low pass duplexer filter Yi road signal input part with low noise rear class amplifying circuit A.
3. a kind of dual-port according to claim 1 is inputted single port output low noise amplifier, it is characterized in that: described B port input signal processing module comprises prime match circuit B, low noise preamplifying circuit B, rear class match circuit B, image-reject filter B and low noise rear class amplifying circuit B, the signal input part of prime match circuit B is connected with antenna, prime match circuit B is successively by low noise preamplifying circuit B, rear class match circuit B, image-reject filter B is connected with another road signal input part of high low pass duplexer filter with low noise rear class amplifying circuit B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421690.9U CN203406832U (en) | 2013-07-16 | 2013-07-16 | Double-port input single-port output low-noise amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421690.9U CN203406832U (en) | 2013-07-16 | 2013-07-16 | Double-port input single-port output low-noise amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203406832U true CN203406832U (en) | 2014-01-22 |
Family
ID=49942751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320421690.9U Expired - Lifetime CN203406832U (en) | 2013-07-16 | 2013-07-16 | Double-port input single-port output low-noise amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203406832U (en) |
-
2013
- 2013-07-16 CN CN201320421690.9U patent/CN203406832U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140122 |
|
| CX01 | Expiry of patent term |