CN205657801U - Dual output satellite signal low noise frequency demultiplier - Google Patents
Dual output satellite signal low noise frequency demultiplier Download PDFInfo
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- CN205657801U CN205657801U CN201620468267.8U CN201620468267U CN205657801U CN 205657801 U CN205657801 U CN 205657801U CN 201620468267 U CN201620468267 U CN 201620468267U CN 205657801 U CN205657801 U CN 205657801U
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Abstract
The utility model discloses a dual output satellite signal low noise frequency demultiplier, including first order amplifier, secondary amplification ware, satellite tuner and with the crystal oscillator who provides reference frequency is connected to satellite tuner electricity, the satellite tuner has first output and second output, the output of first order amplifier with the input electricity of secondary amplification ware is connected, the output of secondary amplification ware with satellite tuner electricity is connected. The utility model discloses simplified circuit design, the signal is stable, and production simple process is favorable to reducing the product volume, reduction in production cost.
Description
Technical field
This utility model relates to satellite communication field, is specifically related to a kind of dual output satellite-signal lnb.
Background technology
Smaller due to the integrated level of circuit in early days, lnb (LOW NOISE BLOCK DOWN CONVERTER on market, it is called for short: LNB, also it is commonly called as: tuner) it is all the satellite low noise frequency demultiplier of conventional DRO circuit, but along with the integrated level of circuit is more and more higher, market is more and more higher for the cost requirement of dual-output low noise frequency demultiplier.And this type of frequency demultiplier circuit on existing market is more complicated, production difficulty is the biggest.
Satellite low noise frequency demultiplier is through a teledish and collects faint satellite TV signal, and by the waveguide pipe of these signaling reflexs to the LNB being arranged on teledish, and amplify and frequency reducing through LNB, make these signals can be reduced into image and audio signal by indoor top box of digital machine (STB) demodulation, then via televising out.Satellite-signal lnb is that the on-off circuit that the signal sent by Set Top Box controls in frequency demultiplier selects corresponding satellite TV signal.
nullExisting satellite-signal lnb is as shown in Figure 1，After teledish collects satellite TV signal，The waveguide into satellite-signal lnb can be reflected，This satellite TV signal comprises satellite horizontal signal and satellite vertical signal，Each signal first order amplifier by this frequency demultiplier，Second level amplifier and third level amplifier carry out the amplification of satellite TV signal and through allotter two kinds of above-mentioned satellite TV signals are divided into two and become four satellite TV signals，Then it is downconverted to intermediate-freuqncy signal after the local oscillation signal mixing produced with high local oscillator oscillating circuit and low local oscillator oscillating circuit respectively after band filter，Now having four kinds of intermediate-freuqncy signals is low-frequency range horizontal signal respectively，High band horizontal signal，Low-frequency range vertical signal and high band vertical signal these four satellite TV signal，These four intermediate-freuqncy signal believes amplifier through first order intermediate frequency respectively，Four enter and connect the cable transmission Set Top Box to indoor by the outfan on frequency demultiplier after scene 2 signal behavior IC and second level intermediate frequency amplifier.The each outfan of this type of frequency demultiplier has low-frequency range horizontal signal, high band horizontal signal, low-frequency range vertical signal and high band vertical signal these four satellite TV signal.Same time user can select to watch the program in one of which satellite TV signal by Set Top Box.The circuit of the most this dual output frequency demultiplier comprises two independence high local oscillator oscillating circuits and low local oscillator oscillating circuit, 4 mixting circuits and 4 first order intermediate frequency amplifiers and below one four enter scene 2 signal behavior IC and second level intermediate frequency amplifier, multiple circuit has resulted in the frequency demultiplier of this dual output and typically to have used two circuit boards and could realize and to weld a lot of pin that connects circuit is coupled together, this makes circuit complicated, cost of parts is high and frequency demultiplier is made bigger, and produce very big with maintenance difficulty, cause production cost high.Therefore, in order to avoid shortcoming present in prior art, it is necessary to prior art is made improvement.
Utility model content
The purpose of this utility model is to overcome shortcoming of the prior art with not enough, it is provided that a kind of can reduce production cost, improve the dual output satellite-signal lnb of signal stabilization.
This utility model is to be realized by following technical scheme:
A kind of dual output satellite-signal lnb, including first order amplifier, second level amplifier, satellite tuner and the crystal oscillator electrically connecting offer reference frequency with described satellite tuner, described satellite tuner has the first outfan and the second outfan, the outfan of described first order amplifier electrically connects with the input of described second level amplifier, and the outfan of described second level amplifier electrically connects with described satellite tuner.
Further, described first order amplifier includes first order horizontal amplifier and first order vertical amplifier, described second level amplifier includes second level horizontal amplifier and second level vertical amplifier, the outfan of described first order horizontal amplifier electrically connects with the input of described second level horizontal amplifier, the outfan of described first order vertical amplifier electrically connects with the input of described second level vertical amplifier, and described second level horizontal amplifier and second level vertical amplifier electrically connect with described satellite tuner respectively.
Further, band filter also it is electrically connected with between described second level horizontal amplifier and described second level vertical amplifier and described satellite tuner.
Further, also it is electrically connected with the first mu balanced circuit between described first outfan and satellite tuner, between described second outfan and satellite tuner, is also electrically connected with the second mu balanced circuit.
Further, the reference frequency of described crystal oscillator is 25 megahertzs.
Relative to prior art, first order amplifier of the present utility model and second level amplifier realize the horizontal and vertical two-stage of satellite-signal and amplify, reference frequency is provided for satellite tuner by crystal oscillator, improve circuit stability, frequency stable, reduces production difficulty, makes circuit structure simpler, be conducive to reducing small product size, reduce production cost.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure principle chart of prior art lnb；
Fig. 2 is the structure principle chart of this utility model dual output satellite-signal lnb.
In figure: 1. first order amplifier；2. second level amplifier；3. third level amplifier；4. first order intermediate frequency amplifier；5. second level intermediate frequency amplifier；6. satellite tuner；7. crystal oscillator；8. first order horizontal amplifier；9. first order vertical amplifier；10. second level horizontal amplifier；11. second level vertical amplifiers；12. band filters；13. first mu balanced circuits；14. second mu balanced circuits；15. first outfans；16. second outfans.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Being illustrated in figure 1 the structure principle chart of prior art lnb, including first order amplifier 1, second level amplifier 2, third level amplifier 3, first order intermediate frequency amplifier 4 and second level intermediate frequency amplifier 5, circuit structure is complicated.
A kind of dual output satellite-signal lnb the most of the present utility model, including first order amplifier 1, second level amplifier 2, satellite tuner 6 and the crystal oscillator 7 electrically connecting offer reference frequency with satellite tuner 6, satellite tuner 6 has the first outfan 15 and the second outfan 16, the outfan of first order amplifier 1 electrically connects with the input of second level amplifier 2, and the outfan of second level amplifier 2 electrically connects with satellite tuner 6.The bias voltage of first order amplifier 1 and second level amplifier 2 is provided by satellite tuner 6.
First order amplifier 1 includes first order horizontal amplifier 8 and first order vertical amplifier 9, second level amplifier 2 includes second level horizontal amplifier 10 and second level vertical amplifier 11, the outfan of first order horizontal amplifier 8 electrically connects with the input of second level horizontal amplifier 10, the outfan of first order vertical amplifier 9 electrically connects with the input of second level vertical amplifier 11, and second level horizontal amplifier 10 and second level vertical amplifier 11 electrically connect with satellite tuner 6 respectively.
Band filter 12 also it is electrically connected with between second level horizontal amplifier 10 and second level vertical amplifier 11 and satellite tuner 6.
Also it is electrically connected with the first mu balanced circuit 13 between first outfan 15 and satellite tuner 6, between the second outfan 16 and satellite tuner 6, is also electrically connected with the second mu balanced circuit 14.First mu balanced circuit 13 and the second mu balanced circuit 14 control voltage supply and the signal output switch of satellite tuner 6 respectively.
The reference frequency of crystal oscillator 4 is 25 megahertzs.
This dual output satellite-signal lnb can be in KU band satellite TV frequency demultiplier, and the size of circuit board can be 37mm～35mm, reduces volume.Realize the signal of the first outfan 15 and second 16 two outfans of outfan not produce and interfere, reach dual output effect.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (5)
1. a dual output satellite-signal lnb, it is characterised in that: include first order amplifier, second level amplifier,
Satellite tuner and electrically connect the crystal oscillator providing reference frequency with described satellite tuner, described satellite tuner has the
One outfan and the second outfan, the outfan of described first order amplifier electrically connects with the input of described second level amplifier,
The outfan of described second level amplifier electrically connects with described satellite tuner.
Dual output satellite-signal lnb the most according to claim 1, it is characterised in that: the described first order is amplified
Device include first order horizontal amplifier and first order vertical amplifier, described second level amplifier include second level horizontal amplifier and
Second level vertical amplifier, the outfan of described first order horizontal amplifier is electrically connected with the input of described second level horizontal amplifier
Connecing, the outfan of described first order vertical amplifier electrically connects with the input of described second level vertical amplifier, the described second level
Horizontal amplifier and second level vertical amplifier electrically connect with described satellite tuner respectively.
Dual output satellite-signal lnb the most according to claim 2, it is characterised in that: described second level level
Band filter also it is electrically connected with between amplifier and described second level vertical amplifier and described satellite tuner.
Dual output satellite-signal lnb the most according to claim 1, it is characterised in that: described first outfan
And also it is electrically connected with the first mu balanced circuit between satellite tuner, is also electrically connected with between described second outfan and satellite tuner
Second mu balanced circuit.
Dual output satellite-signal lnb the most according to claim 1, it is characterised in that: described crystal oscillator
Reference frequency be 25 megahertzs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468267.8U CN205657801U (en) | 2016-05-19 | 2016-05-19 | Dual output satellite signal low noise frequency demultiplier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620468267.8U CN205657801U (en) | 2016-05-19 | 2016-05-19 | Dual output satellite signal low noise frequency demultiplier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205657801U true CN205657801U (en) | 2016-10-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620468267.8U Active CN205657801U (en) | 2016-05-19 | 2016-05-19 | Dual output satellite signal low noise frequency demultiplier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205657801U (en) |
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2016
- 2016-05-19 CN CN201620468267.8U patent/CN205657801U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |