CN205864594U - A kind of tuner - Google Patents
A kind of tuner Download PDFInfo
- Publication number
- CN205864594U CN205864594U CN201620677434.XU CN201620677434U CN205864594U CN 205864594 U CN205864594 U CN 205864594U CN 201620677434 U CN201620677434 U CN 201620677434U CN 205864594 U CN205864594 U CN 205864594U
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- Prior art keywords
- tuner
- frequency
- signal
- module
- intermediate frequency
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Abstract
The utility model discloses a kind of tuner, including tuner cavity and be arranged on the wiring board on described tuner cavity, described wiring board includes the rf signal reception module being sequentially connected with, radiofrequency signal amplification module, radiofrequency signal filtration module, local oscillator resonance modules, frequency mixing module, intermediate frequency amplification module, switching switch, output port group and power supply circuits, wherein, described output port group 12 connects external DVB group, each DVB is respectively connected with a regulator block by power supply circuits, each two regulator block connects a compound diode, described compound diode is connected with intermediate frequency amplification module.This tuner can realize intermediate-freuqncy signal output and being effectively isolated of power supply, and improves capacity of resisting disturbance and the stability of the signal of product own, and reduces the area of circuit, simplifies circuit and designs.
Description
Technical field
This utility model relates to communication frequency demultiplier field, particularly relates to a kind of tuner.
Background technology
It is to utilize satellite antenna to collect faint satellite-signal that satellite antenna receives the operation principle of satellite television, and should
Satellite-signal reflexes to the device tuner (LNB) at disc-shaped antenna focal point.Then, this is concentrated signal to amplify by tuner,
And rf frequency is down to the intermediate frequency of about 1GHz to 2GHz, receptor or the numeral of indoor then it is sent to via cable
Output port group, channel to be watched in signal is selected by receptor, after amplified demodulation is recovered to image and acoustical signal,
Just input TV and play program.
The operating circuit of tuner generally comprises front radio-frequency three-stage amplifier, filter circuit, high/low frequency local oscillator resonance
Circuit, mixting circuit, one-level intermediate level circuit, switching on-off circuit and two pole intermediate level circuits, it can be by Ku wave band (10.7GHz
～12.75GHz) weak radio-frequency signal got off of satellite transmission is amplified, filter after, then with local oscillator resonant frequency therein
(9.75GHz ~ 10.6GHz) use after supradyne manner mixing frequency reducing intermediate frequency required for output port group (950MHz～
2150MHz) signal..
During described tuner completes reception and transmission processes radiofrequency signal, described output port group is signal
Outfan, is also power end, and each DVB is respectively connected with a regulator block for providing stable running voltage to elements at different levels,
Altering for preventing regulator block from reversely returning to the running voltage that each anterior member of tuner exports, each regulator block is respectively connected with one
Unilateral diode, any one-channel signal is both needed to mate unilateral diode through regulator block output and supplies to chips at different levels and amplifier
Electricity；When four road signal regulator blocks are respectively configured unilateral diode, high-frequency circuit configuration area occupied is big, material cost
High；Because overall work circuit layout exists commonality components and parts, therefore four road voltages are when regulator block output services voltage, use class
Connecting up like separate mode, there is multiway intersection in each input power supply and intermediate-freuqncy signal outlet line, in intermediate-freuqncy signal circuit and unit
During part working power crossing elimination, although have placement electric capacity or resistance to carry out jumping and put and filter, but low-frequency electrical subsidiary on power supply
Drain off and disturb signal, IF output signal can be produced line equally and strongly disturb, such as: produce corresponding parasitic electric capacity, stray inductance etc
Clutter effect.
Utility model content
In order to solve above-mentioned the deficiencies in the prior art, this utility model provides a kind of tuner.This tuner can realize
Intermediate-freuqncy signal output is effectively isolated with power supply, improves capacity of resisting disturbance and the stability of the signal of product own, and reduces line
The area on road, simplifies circuit design.
Technical problem to be solved in the utility model is achieved by the following technical programs:
A kind of tuner, including tuner cavity and be arranged on the wiring board on described tuner cavity, described wiring board
Including the rf signal reception module being sequentially connected with, radiofrequency signal amplification module, radiofrequency signal filtration module, local oscillator resonant mode
Block, frequency mixing module, intermediate frequency amplification module, switching switch, output port group and power supply circuits, wherein, described output port group is even
Being connected to external DVB group, each DVB is respectively connected with a regulator block by power supply circuits, and each two regulator block connects one
Compound diode, described compound diode is connected with intermediate frequency amplification module.
Further, described output port group includes four output ports, and described compound diode has two.
Further, described rf signal reception module includes horizontally-polarized antenna and vertical polarized antenna.
Further, described radiofrequency signal amplification module includes first stage amplifier, two-stage amplifier and third stage amplifier.
Further, described radiofrequency signal filtration module includes power splitter, high freguency bandpass filter and low-frequency band pass filter
Device.
Further, described local oscillator resonance modules includes high-frequency circuit and low-frequency resonant circuit.
Further, described intermediate frequency amplification module includes one-level intermediate frequency amplifier, two grades of intermediate frequency amplifiers.
This utility model has the advantages that voltage connections input port that compound diode formed is by former
Ben tetra-tunnel becomes two-way, and the supply line of DVB significantly reduces with the intermediate-freuqncy signal outlet line cross point of output port, thus
When realizing pcb board layout, IF output signal circuit is effectively isolated with DVB supply line, improves the anti-of the signal of product own
Interference performance and stability, and reduce the area of circuit, simplify circuit design.
Accompanying drawing explanation
Fig. 1 is the connection block diagram of this utility model embodiment 1 wiring board；
Fig. 2 is the circuit theory diagrams of this utility model embodiment 1 wiring board；
Fig. 3 is rf signal reception module in Fig. 2, the enlarged drawing of radiofrequency signal amplification module；
Fig. 4 is radiofrequency signal filtration module in Fig. 2, local oscillator resonance modules, frequency mixing module, frequency multiplication interference signal filtering mould
Block, the enlarged drawing of one-level intermediate frequency amplifier；
Fig. 5 is two grades of intermediate frequency amplifiers in Fig. 2, switching switch, output port group and the enlarged drawing of power supply circuits；
Fig. 6 is two grades of intermediate frequency amplifiers, output port group and the external DVB of this utility model embodiment 2 wiring board
Connect block diagram；
Fig. 7 is the circuit theory diagrams of this utility model embodiment 2 wiring board；
Fig. 8 is radiofrequency signal filtration module in Fig. 7, local oscillator resonance modules, frequency mixing module, frequency multiplication interference signal filtering mould
Block, the enlarged drawing of one-level intermediate frequency amplifier；
Fig. 9 is two grades of intermediate frequency amplifiers in Fig. 7, switching switch, output port group and the enlarged drawing of power supply circuits；
Figure 10 is the enlarged drawing of compound diode in Fig. 9；
Figure 11 is the structure schematic diagram of this utility model tuner cavity；
Figure 12 is the Facad structure schematic diagram of this utility model tuner cavity.
Detailed description of the invention
With embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Embodiment 1
A kind of tuner, including tuner cavity and be arranged on the wiring board on described tuner cavity.Such as Figure 11 and 12
Shown in, described tuner cavity includes waveguide 16, the waveguide mouth 17 being connected respectively and loading plate with described waveguide 16 two ends
18, described wiring board is arranged on described loading plate 18.
As Fig. 1 is to shown in 5, and described wiring board includes that the rf signal reception module 1 being sequentially connected with, radiofrequency signal amplify mould
Block 2, radiofrequency signal filtration module, local oscillator resonance modules, frequency mixing module 8, frequency multiplication interference signal filtering module 14, intermediate frequency amplify mould
Block, switching switch 11, output port group 12 and power supply circuits 13.Described output port group 12 connects external DVB group, described
DVB group is responsible for being decoded into rf signal reception process audio signal and video signal, and gives height by power supply circuits 13
Frequently head is powered.
Described rf signal reception module 1 includes horizontally-polarized antenna and vertical polarized antenna, is respectively used to receive space
The ku waveband radio frequency signal both horizontally and vertically gone up, ku audio range frequency is 10.7 ~ 12.75GHz；
Described radiofrequency signal amplification module 2 includes first stage amplifier, two-stage amplifier and third stage amplifier, connects for amplification
The ku waveband radio frequency signal received；
Described radiofrequency signal filtration module includes power splitter 3, high freguency bandpass filter 4 and low frequency bandpass filter 5, and merit is divided
The device 3 ku waveband radio frequency signal after amplifying is divided into low-frequency band (10.7GHz ~ 11.7GHz) and high frequency band
(11.7GHz ~ 12.75GHz), high/low band-pass filter, for filtering low-frequency band and high frequency band, filters low frequency
Radiofrequency signal beyond wave band and high frequency band；
Described local oscillator resonance modules includes high-frequency circuit 6 and low-frequency resonant circuit 7, is respectively used to low-frequency band defeated
Enter the low frequency local oscillator of 9.75GHz, the high-frequency local oscillation to high frequency band input 10.6GHz；
Described frequency mixing module 8, is used for mixing low-frequency band and low frequency local oscillator, high frequency band and high-frequency local oscillation, and obtains four
Road intermediate-freuqncy signal (0.95GHz, 1.95GHz, 1.1GHz, 2.15GHz)；
Described frequency multiplication interference signal filtering module 14 includes LC filter circuit or/and microstrip line three rank band filter, uses
Yu Dui tetra-tunnel intermediate-freuqncy signal filters, the frequency multiplication interference letter beyond the four tunnel intermediate-freuqncy signals produced during filtering mixing frequency reducing
Number；
Described intermediate frequency amplification module includes one-level intermediate frequency amplifier 9 and two grades of intermediate frequency amplifiers 10, for amplifying through filtering
Hou tetra-tunnel intermediate-freuqncy signal；
Described switching switch 11 switchs for 4*4 switching, be positioned at one-level intermediate frequency amplifier 9 and two grades of intermediate frequency amplifiers 10 it
Between, for the switching of four tunnel intermediate-freuqncy signals is controlled；
Described output port group 12 includes four output ports, is respectively used to export four tunnel intermediate-freuqncy signals, four outfans
Mouth DVB external with four respectively is connected, and the reception frequency of DVB is 0.95 ~ 2.15GHz；Further, described external DVB group is led to
Cross power supply circuits 13 to supplying power for tuner.
Preferably, described LC filter circuit is by inductance component L: 27nH and capacitor C:1.2pF is serially connected ground connection institute shape
Become；Described microstrip line three rank band filter is formed by three rank 50 Ω microstrip lines, and its size is respectively long 1.26mm width 1mm, length
0.75mm width 1mm, long 0.85mm width 1mm.
As shown in Figure 11,12, described horizontally-polarized antenna and vertical polarized antenna are arranged in described waveguide 16, described
Loading plate 18 is provided with some wiring holes 19 and some screw holes 20.Increase described screw hole 20, iron covering ground connection can be strengthened, strengthen
Signal shielding, it is possible to well prevent the closed-loop path of described loading plate 18 from high-frequency signal being disturbed.Preferably, described loading plate
18 opposite sides use the design of part hollow outs, can reduce material cost, and perfect heat-dissipating.
Frequency multiplication interference signal filtering module 14 described in the present embodiment can filter radiofrequency signal and local oscillator resonance in mixing fall
The clutter frequency multiplication produced during Pin, to reach to prevent times frequency interference signal from the intermediate-freuqncy signal of output is produced the purpose of interference,
Compared with the mode that wave plate is inhaled in the ground connection stock position of existing reinforcement radome or external high-frequency, substantial amounts of artificial and material can be saved
Material cost, also has improvement greatly to the stability that product is overall.
By the frequency multiplication interference signal filtering module formed combined by LC filter circuit and microstrip line three rank band filter
14, a frequency multiplication and two frequencys multiplication that radiofrequency signal and the mixing of local oscillator resonance can be subtracted each other institute's appendix in the intermediate-freuqncy signal of Hou tetra-tunnel are done
Scrambling point is decayed and is suppressed, thus realizes the filtration of times frequency interference signal in four tunnel intermediate-freuqncy signals and improve four road intermediate frequencies
The Q-value of signal；Mono-times of frequency multiplication clutter of 850MHZ in four tunnel intermediate-freuqncy signals can be carried out decay suppression by described LC filter circuit,
Reduce and suppress frequency multiplication to play the dB value of dot frequency, thus reducing the interference to receiving effective frequency 950MHZ of the frequency multiplication clutter
Purpose；Described microstrip line three rank band filter can suppress 1700MHZ 2 octave frequency noise jamming.
Embodiment 2
A kind of tuner, including tuner cavity and be arranged on the wiring board on described tuner cavity.Such as Figure 11 and 12
Shown in, described tuner cavity includes waveguide 16, the waveguide mouth 17 being connected respectively and loading plate with described waveguide 16 two ends
18, described wiring board is arranged on described loading plate 18.
As illustrated in figures 6-10, described wiring board includes that the rf signal reception module 1 being sequentially connected with, radiofrequency signal amplify mould
Block 2, radiofrequency signal filtration module, local oscillator resonance modules, frequency mixing module 8, intermediate frequency amplification module, switching switch 11, output port
Group 12 and power supply circuits 13.Described output port group 12 connects external DVB group, and described DVB group is responsible for connecing radiofrequency signal
Receive and process and be decoded into audio signal and video signal, and give supplying power for tuner by power supply circuits 13.
Wherein, described rf signal reception module 1 includes horizontally-polarized antenna and vertical polarized antenna, is respectively used to receive
Ku waveband radio frequency signal on space level and vertical direction, ku audio range frequency is 10.7 ~ 12.75GHz；Described radiofrequency signal is put
Big module 2 includes first stage amplifier, two-stage amplifier and third stage amplifier, for amplifying the ku waveband radio frequency signal received；
Described radiofrequency signal filtration module includes power splitter 3, high freguency bandpass filter 4 and low frequency bandpass filter 5, and merit is divided
The device 3 ku waveband radio frequency signal after amplifying is divided into low-frequency band (10.7GHz ~ 11.7GHz) and high frequency band
(11.7GHz ~ 12.75GHz), high/low band-pass filter, for filtering low-frequency band and high frequency band, filters low frequency
Radiofrequency signal beyond wave band and high frequency band；Described local oscillator resonance modules includes high-frequency circuit 6 and low-frequency resonant circuit
7, it is respectively used to the low frequency local oscillator to low-frequency band input 9.75GHz, the high-frequency local oscillation to high frequency band input 10.6GHz；Institute
State frequency mixing module 8 for mixing low-frequency band and low frequency local oscillator, high frequency band and high-frequency local oscillation, and obtain four tunnel intermediate-freuqncy signals
(0.95GHz, 1.95GHz, 1.1GHz, 2.15GHz)；Described intermediate frequency amplification module includes in one-level intermediate frequency amplifier 9 and two grades
Audio amplifier 10, for amplifying four tunnel intermediate-freuqncy signals；
Described switching switch 11 is 4*4 switching switch 11, be positioned at one-level intermediate frequency amplifier 9 and two grades of intermediate frequency amplifiers 10 it
Between, for the switching of four tunnel intermediate-freuqncy signals is controlled；
Described output port group 12 includes four output ports, is respectively used to export four tunnel intermediate-freuqncy signals, four outfans
Mouth DVB external with four respectively is connected, and the reception frequency of DVB is 0.95 ~ 2.15GHz；Wherein, described DVB group is to tuner
In the power supply circuits 13 of power supply, each DVB is respectively connected with a regulator block, and each two regulator block is connected to a compound diode
15, described compound diode 15 is connected with two grades of intermediate frequency amplifiers 10 of front end.
As shown in FIG. 11 and 12, described loading plate 18 is provided with some wiring holes 19 and some screw holes 20.Increase described
Screw hole 20, can strengthen iron covering ground connection, and enhancing signal shields, it is possible to well prevent the closed-loop path of described loading plate 18 to height
Frequently signal disturbing.Preferably, described loading plate 18 opposite side uses the design of part hollow out, can reduce material cost, and dissipate
Good in thermal property.
Preferably, between described frequency mixing module 8 and intermediate frequency amplification module, it is also associated with frequency multiplication interference signal filtering module 14,
Described frequency multiplication interference signal filtering module 14 includes LC filter circuit or/and microstrip line three rank band filter, is used for four tunnels
Intermediate-freuqncy signal filters, times frequency interference signal beyond four tunnel intermediate-freuqncy signals produced during filtering mixing frequency reducing.
During described wiring board completes reception and transmission processes radiofrequency signal, described external DVB group is defeated
Going out the decoding end of signal, be also the power end of tuner, described regulator block is electric to the work that elements at different levels offer is stable for DVB
Pressure, described compound diode 15 is altered for preventing DVB from reversely returning to the running voltage that elements at different levels export.
In the prior art, alter for preventing regulator block from reversely returning to the running voltage that each anterior member of wiring board exports,
Each regulator block is respectively connected with a unilateral diode, and any one-channel signal is both needed to mate unilateral diode through regulator block output
Power to chips at different levels and amplifier；When four road signal regulator blocks are respectively configured unilateral diode, high-frequency circuit configuration
Area occupied is big, and material cost is high；Because overall work circuit layout exists commonality components and parts, therefore four road voltages are defeated through regulator block
When going out running voltage, using similar separate mode wiring, there is multiway intersection in Ge Duan supply line and intermediate-freuqncy signal outlet line,
When intermediate-freuqncy signal circuit intersects with element manipulation supply line, although have placement electric capacity or resistance to carry out jumping and put and filter, but
Low-frequency current interference signal subsidiary in supply line, can produce line to IF output signal equally and strongly disturb, such as: produce corresponding
The clutter effect of parasitic capacitance, stray inductance etc.
At voltage after regulator block voltage stabilizing exports, the voltage connections input port that compound diode 15 is formed is by former
Ben tetra-tunnel becomes two-way, and DVB supply line significantly reduces with IF output signal cross point, thus when realizing pcb board layout,
The intermediate-freuqncy signal outlet line of output port is effectively isolated with the power supply circuits 13 of DVB, improves the anti-interference of the signal of product own
Ability and stability, and reduce the area of circuit, simplify circuit design.
Embodiment described above only have expressed embodiment of the present utility model, and it describes more concrete and detailed, but also
Therefore the restriction to this utility model the scope of the claims can not be interpreted as, as long as using equivalent or the form institute of equivalent transformation
The technical scheme obtained, all should fall within protection domain of the present utility model.
Claims (7)
1. a tuner, including tuner cavity and be arranged on the wiring board on described tuner cavity, it is characterised in that institute
State rf signal reception module that wiring board includes being sequentially connected with, radiofrequency signal amplification module, radiofrequency signal filtration module, local oscillator
Resonance modules, frequency mixing module, intermediate frequency amplification module, switching switch, output port group and power supply circuits, wherein, described outfan
Mouth group connects external DVB group, and each DVB is respectively connected with a regulator block by power supply circuits, and each two regulator block connects
Having a compound diode, described compound diode is connected with intermediate frequency amplification module.
Tuner the most according to claim 1, it is characterised in that described output port group includes four output ports, institute
State compound diode and have two.
Tuner the most according to claim 1, it is characterised in that described rf signal reception module includes horizontal polarization sky
Line and vertical polarized antenna.
Tuner the most according to claim 1, it is characterised in that described radiofrequency signal amplification module includes that one-level is amplified
Device, two-stage amplifier and third stage amplifier.
Tuner the most according to claim 1, it is characterised in that described radiofrequency signal filtration module includes power splitter, height
Band-pass filter and low frequency bandpass filter.
Tuner the most according to claim 1, it is characterised in that described local oscillator resonance modules include high-frequency circuit and
Low-frequency resonant circuit.
Tuner the most according to claim 1, it is characterised in that described intermediate frequency amplification module includes that one-level intermediate frequency amplifies
Device, two grades of intermediate frequency amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620677434.XU CN205864594U (en) | 2016-07-01 | 2016-07-01 | A kind of tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620677434.XU CN205864594U (en) | 2016-07-01 | 2016-07-01 | A kind of tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205864594U true CN205864594U (en) | 2017-01-04 |
Family
ID=57644280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620677434.XU Expired - Fee Related CN205864594U (en) | 2016-07-01 | 2016-07-01 | A kind of tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205864594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115426865A (en) * | 2022-08-22 | 2022-12-02 | 广州国保科技有限公司 | Mobile phone shielding cabinet |
-
2016
- 2016-07-01 CN CN201620677434.XU patent/CN205864594U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115426865A (en) * | 2022-08-22 | 2022-12-02 | 广州国保科技有限公司 | Mobile phone shielding cabinet |
| CN115426865B (en) * | 2022-08-22 | 2023-11-03 | 广州国保科技有限公司 | Mobile phone shielding cabinet |
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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: 20170104 Termination date: 20210701 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |