CN203457234U - A low-noise block downconverter - Google Patents
A low-noise block downconverter Download PDFInfo
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- CN203457234U CN203457234U CN201320585226.3U CN201320585226U CN203457234U CN 203457234 U CN203457234 U CN 203457234U CN 201320585226 U CN201320585226 U CN 201320585226U CN 203457234 U CN203457234 U CN 203457234U
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- low
- frequency amplifier
- frequency
- voltage control
- noise block
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Abstract
Provided is low-noise block downconverter capable of eliminating interference on a polarized switching signal caused by an electric signal generated by transient or other effects in a circuit and preventing switching faults. The low-noise block downconverter comprises a band-pass filter, a high-frequency amplifier, a mixer, a local oscillator, an intermediate-frequency amplifier, a polarized signal change-over switch, and a voltage control and management module. The voltage control and management module comprises a biasing circuit, a voltage detector, and a voltage-stabilizing power supply. The low-noise block downconverter has advantages that the voltage detector is added so as to accurately detect and switch horizontal and vertical linear signals or left and right circular polarized signals, reject any unneeded signal generated by the transient or other effects, eliminate switching faults, and increase the reliability of the low-noise block downconverter, and that the biasing circuit capable of providing bias for multiple crystal field effect transistors is added so as to stably control multiple low-noise amplifiers and an active mixer, enhance the performance of the low-noise block downconverter, and reduce the regulating requirement of the product.
Description
Technical field
The utility model relates to satellite TV technology, is specifically related to a kind of tuner.
Background technology
Satellite television low noise block downconverter claims again tuner, and it is to consist of band pass filter, high-frequency amplifier, frequency mixer, local oscillator and intermediate frequency amplifier.The effect of tuner is to receive satellite TV signal, and carries out channel selection, signal amplification and down conversion process, the intermediate-freuqncy signal of final stable output.We know, conventionally have 24 television channels on every satellite, in order to make full use of these channels, and the phase mutual interference of avoiding adjacent channel, conventionally channel order is separated by single, double, with the electromagnetic wave of different polarization modes, launch respectively.Therefore, satellite ground receives the tuner using, and must possess the electromagnetic ability of the dual polarization of reception, could receive the TV programme of whole 24 channels.
In order to reach above-mentioned functions, we have designed bipolarity feed integral high frequency head.Bipolarity list local oscillator list output high frequency tuner is modal bipolarity feed integral high frequency head, there are two orthogonal probes its waveguide inside, receive respectively level (H), vertical (V) signal, also have a horizontal bar therebetween for isolation pin, play polarization isolation effect.Bipolarity list output high frequency tuner, can regard two split type tuners of single polarization as and share a feed, and 13/18V electronic switch circuit is incorporated into inside cavity, automatically the polarizing voltage height that identification receiver is sent here, 18V or 13V, with selection level or vertical polarization probe work, thereby reach the object that bipolarity list is exported.
Yet at work, the signal of telecommunication being produced by transient state and other effects in circuit can disturb polarization switching signal tuner, causing switching to make mistakes has affected the reliability of radio TV signals receiving and user's experience.
Summary of the invention
The utility model, for the problems referred to above, has proposed a kind of novel tuner, can eliminate the signal of telecommunication being produced by transient state and other effects in circuit and can disturb polarization switching signal, avoids switching and makes mistakes.
The utility model solves the technical scheme that its technical problem adopts: a kind of tuner, comprises band pass filter, high-frequency amplifier, frequency mixer, local oscillator, intermediate frequency amplifier, polarized signal diverter switch and voltage control and administration module.Described band pass filter, high-frequency amplifier, frequency mixer, intermediate frequency amplifier are connected successively, described voltage control and administration module are connected respectively with described band pass filter, high-frequency amplifier, frequency mixer, local oscillator, intermediate frequency amplifier, polarized signal diverter switch, the described local oscillator other end is connected with described frequency mixer, and the described polarized signal diverter switch other end is connected with intermediate-freuqncy signal output.
Described voltage control and administration module, comprising:
Biasing circuit, is used to amplifier and frequency mixer that biasing is provided;
Voltage detector, for detection of with switching level and vertical linearity or left and right Circular Polarisation signal, refuse any unwanted signal being produced by transient state and other effects;
Stabilized voltage power supply, is used to internal circuit and the additional LNB element power supply that comprises intermediate-frequency gain level and local oscillator.
The beneficial effects of the utility model are, owing to having increased a voltage detector, can detect exactly and switching level and vertical linearity or left and right Circular Polarisation signal and refuse any unwanted signal being produced by transient state and other effects, eliminated to switch and made mistakes, increased the reliability of tuner.Meanwhile, increase by one and can be the biasing circuit that a plurality of crystal field effects pipes provide biasing, can stablize and control a plurality of low noise amplifier levels and active mixer, strengthened tuner performance, reduced the adjustment requirement of product.
Accompanying drawing explanation
Fig. 1 is the operation principle block diagram of the utility model tuner;
Fig. 2 is the structured flowchart of the utility model voltage control and administration module.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment 1
As Fig. 1, the tuner that the utility model provides comprises band pass filter 1, high-frequency amplifier 2, frequency mixer 3, local oscillator 5, intermediate frequency amplifier 4, polarized signal diverter switch 6 and voltage control and administration module 7.Described band pass filter 1, high-frequency amplifier 2, frequency mixer 3, intermediate frequency amplifier 4 are connected successively, described voltage control and administration module 7 are connected respectively with described band pass filter 1, high-frequency amplifier 2, frequency mixer 3, local oscillator 5, intermediate frequency amplifier 4, polarized signal diverter switch 6, described local oscillator 5 other ends are connected with described frequency mixer 3, and described polarized signal diverter switch 6 other ends are connected with intermediate-freuqncy signal output.
As Fig. 2, described voltage control and administration module 7, comprising:
Biasing circuit 8, is used to amplifier and frequency mixer that biasing is provided;
Voltage detector 9, for detection of with switching level and vertical linearity or left and right Circular Polarisation signal, refuse any unwanted signal being produced by transient state and other effects;
Stabilized voltage power supply 10, is used to internal circuit and the additional LNB element power supply that comprises intermediate-frequency gain level and local oscillator.
The course of work of tuner is: receive high-frequency signal, band pass filter 1 is selected the high-frequency signal of suitable frequency range, 2 pairs of high-frequency signals of high-frequency amplifier amplify, export intermediate-freuqncy signals with frequency signal process frequency mixer 3 mixing of local oscillator 5 generations afterwards, finally by crossing intermediate frequency amplifier 4 amplifications, from medium frequency output end, export.Wherein, the biasing circuit 8 in voltage control and administration module 7, for high-frequency amplifier 2, frequency mixer 3 and intermediate frequency amplifier 4 provide biasing, guarantees that signal amplifies and undistorted.Stabilized voltage power supply 10 in voltage control and administration module 7 is band pass filter 1, high-frequency amplifier 2, frequency mixer 3, local oscillator 5, intermediate frequency amplifier 4,6 power supplies of polarized signal diverter switch.When setting of the programs horizontal polarization, receiver is fed to 18V voltage to tuner; During perpendicular polarization, be fed to 13V voltage.Operating voltage in voltage detector 9 testing circuits in voltage control and administration module 7, and be fed to polarized signal diverter switch 6, polarized signal diverter switch 6 is according to the operating voltage switching that polarizes.Meanwhile, the interference signal being produced by transient state and other effects in voltage detector 9 identification circuits, refusal is fed to polarized signal diverter switch 6, has avoided polarized signal diverter switch 6 and has carried out and switch action because interference signal disturbs, and has eliminated to switch and has made mistakes.
Claims (3)
1. a tuner, comprise band pass filter, high-frequency amplifier, frequency mixer, local oscillator, intermediate frequency amplifier, polarized signal diverter switch, it is characterized in that: also comprise voltage control and administration module, described voltage control and administration module comprise voltage detector, for detection of with switching level and vertical linearity or left and right Circular Polarisation signal, refuse any unwanted signal being produced by transient state and other effects; Described band pass filter, high-frequency amplifier, frequency mixer, intermediate frequency amplifier are connected successively, described voltage control and administration module are connected respectively with described band pass filter, high-frequency amplifier, frequency mixer, local oscillator, intermediate frequency amplifier, polarized signal diverter switch, the described local oscillator other end is connected with described frequency mixer, and the described polarized signal diverter switch other end is connected with intermediate-freuqncy signal output.
2. tuner according to claim 1, is characterized in that: wherein said voltage control and administration module also comprise biasing circuit, is used to amplifier and frequency mixer that biasing is provided.
3. tuner according to claim 1, is characterized in that: wherein said voltage control and administration module also comprise stabilized voltage power supply, is used to internal circuit and the additional LNB element power supply that comprises intermediate-frequency gain level and local oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320585226.3U CN203457234U (en) | 2013-09-23 | 2013-09-23 | A low-noise block downconverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320585226.3U CN203457234U (en) | 2013-09-23 | 2013-09-23 | A low-noise block downconverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203457234U true CN203457234U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320585226.3U Expired - Fee Related CN203457234U (en) | 2013-09-23 | 2013-09-23 | A low-noise block downconverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203457234U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469214A (en) * | 2015-01-04 | 2015-03-25 | 安徽波维电子科技有限公司 | Ku wave band single-local-oscillator and double-output tuner |
| CN104486568A (en) * | 2015-01-04 | 2015-04-01 | 安徽波维电子科技有限公司 | Double-power-module Ku waveband tuner |
-
2013
- 2013-09-23 CN CN201320585226.3U patent/CN203457234U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469214A (en) * | 2015-01-04 | 2015-03-25 | 安徽波维电子科技有限公司 | Ku wave band single-local-oscillator and double-output tuner |
| CN104486568A (en) * | 2015-01-04 | 2015-04-01 | 安徽波维电子科技有限公司 | Double-power-module Ku waveband tuner |
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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 |
Granted publication date: 20140226 Termination date: 20180923 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |