CN201142720Y - Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system - Google Patents
Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system Download PDFInfo
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- CN201142720Y CN201142720Y CNU2007201965905U CN200720196590U CN201142720Y CN 201142720 Y CN201142720 Y CN 201142720Y CN U2007201965905 U CNU2007201965905 U CN U2007201965905U CN 200720196590 U CN200720196590 U CN 200720196590U CN 201142720 Y CN201142720 Y CN 201142720Y
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Abstract
The utility model discloses a tuner and satellite digital television signal receiving and processing circuit and a receiving system. The tuner comprises a signal receiving and processing circuit for pre-processing the received radio-frequency signal of a satellite digital television; a tuning circuit used for conducting digital television receiving and tuning processing for the output signal of the signal receiving and processing circuit, and outputting a base band simulation I/Q differential signal; and the input end of the tuning circuit is connected with the output end of the signal receiving and processing circuit. The signal receiving and processing circuit comprises a band-pass filter used for conducting filter processing for the radio-frequency signal of the satellite digital television; a low noise amplifier connecting the band-pass filter and amplifying the radio-frequency signal; and a power supply filter circuit connecting the low noise amplifier and conducting decoupling and filter-processing for the power supply of the low noise amplifier. The comparatively simple circuit structure in the utility model realizes the plate-carried tuner, and the working performance and the stability of the tuner are improved.
Description
Technical field
The utility model relates to a kind of tuner, especially relate to and a kind ofly carry the tuner that (On-Board) mentality of designing realizes, and make the signal receiving processing circuit of radiofrequency signal pre-process and have the satellite digital television receiving system of this tuner for tuner with plate.
Background technology
When carrying out the reception of satellite digital TV signal, needing to receive satellite communication institute frequency of utilization is more than the 4G HZ and power is that other radiofrequency signal of mW level and frequency conversion are intermediate-freuqncy signal, and further conversion demodulates original information again.In the process of this conversion demodulation, need one earlier intermediate-freuqncy signal to be transformed to baseband signal, thereby send the demodulation module demodulation to.
For satisfying the demand of market to company's product diversification, simultaneously because market competition is brought the pressure of production manufacturing cost, a lot of companies are when the product design of satellite digital television receiving system, the plate that all adopts portions of electronics sets of lines with tuner to be formed on the main circuit board of satellite digital tv receiver carries (On-Board) mentality of designing, can reduce the hardware cost of product greatly.
At present,, the manufacturer of main satellite digital television receiving system carries the tuner of mentality of designing, to adapt to the needs in the market that changes day by day though having developed based on various tuning, demodulation chips, employing plate.But owing to have a great difference based on the solution of different tuning chip manufacturer on peripheral circuit is realized, the concrete adjustment of component parameter also has sizable difference; In addition, though adopt the tuner that plate carries mentality of designing to have cost advantage, generally has the defective that the channel index is relatively poor, stability is on the low side than independent tuner.
The utility model content
Technical problem to be solved in the utility model is a kind of tuner that carries the realization of (On-Board) mentality of designing with plate, and the signal receiving processing circuit and satellite digital television receiving system of making the radiofrequency signal pre-process for tuner with this tuner, realize that with better simply circuit structure plate carries the tuner of design, improve the service behaviour and the stability of tuner.
For solving technical problem of the present utility model, the utility model discloses a kind of tuner, comprising:
The radiofrequency signal of the satellite digital TV that receives is made the signal receiving processing circuit of pre-process;
Described signal receiving processing circuit output signal is done the tuning processing of digital television reception, the tuning circuit of output baseband analog I/Q differential signal, its input connects the output of described signal receiving processing circuit;
Wherein, described signal receiving processing circuit comprises:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
More excellent, described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, the coupling of the radiofrequency signal after the processing and amplifying exported to second coupling capacitor of described tuning circuit.
More excellent, described low noise amplifier also comprises:
Be connected the output of described amplifier element, the radiofrequency signal after the processing and amplifying be divided into the microstrip line of two-way;
Connecting described microstrip line, is the decay matching network circuit that the decay matching treatment is made in loop output with one tunnel radiofrequency signal wherein.
More excellent, described amplifier element is that base stage connects the output of described band pass filter and output, the collector electrode of described electric source filter circuit exported the radiofrequency signal after the processing and amplifying, the transistor of grounded emitter.
More excellent, tuner of the present utility model also comprises: for described tuning circuit provides the voltage conversion circuit of working power, it is connected with described tuning circuit.
In addition, the utility model also discloses a kind of satellite digital TV signal receiving processing circuit, comprising:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
More excellent, described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, with second coupling capacitor of the coupling of the radiofrequency signal after processing and amplifying output.
More excellent, described low noise amplifier also comprises:
Be connected the output of described amplifier element, the radiofrequency signal after the processing and amplifying be divided into the microstrip line of two-way;
Connect described microstrip line, one tunnel radiofrequency signal is wherein made the decay matching network circuit of decay matching treatment for realizing loop output.
Moreover the utility model also discloses a kind of satellite digital television receiving system, comprises the antenna that is used for receiving satellite word TV signal at least; Connect described antenna, digital television signal is made the tuner of tuning processing; And the satellite digital tv receiver that connects described tuner; Described tuner comprises:
The radiofrequency signal of the satellite digital TV that receives is made the signal receiving processing circuit of pre-process;
Described signal receiving processing circuit output signal is done the tuning processing of digital television reception, the tuning circuit of output baseband analog I/Q differential signal, its input connects the output of described signal receiving processing circuit;
Wherein, described signal receiving processing circuit comprises:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
More excellent, described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, the coupling of the radiofrequency signal after the processing and amplifying exported to second coupling capacitor of described tuning circuit.
Compared with prior art, the utlity model has following beneficial effect:
The tuner that the utility model proposes than independent tuner, has the advantages that production cost is low, assembling procedure is few, can save artificial, minimizing material, thereby reduce the complete machine cost.In addition, tuner of the present utility model is compared than existing tuner, has also improved the channel index, further reduced cost, owing to changed the tuning chip solution, tuning chip provider has also used newer technology, makes the job stability of whole tuner promote greatly simultaneously.
Description of drawings
Fig. 1 is the structural representation of a specific embodiment of the utility model.
Fig. 2 is the circuit diagram of a specific embodiment of signal receiving processing circuit among Fig. 1.
Fig. 3 is the circuit diagram of a specific embodiment of tuning circuit among Fig. 1.
Fig. 4 is the circuit diagram of a specific embodiment of voltage conversion circuit among Fig. 1.
Embodiment
The utility model is the solution that proposes a kind of tuner that designs in plate (On-Board) mode of carrying, with a tuning chip core that realizes the tuning circuit function, and design correspondent peripheral circuit, the repertoire of the tuner that complete realization plate carries; Because the utility model especially enters tuning chip signal receiving processing circuit before to radiofrequency signal and has done improvement, thereby has improved the channel index and the stable work in work of tuner.
With reference to shown in Figure 1, the tuner 100 of present embodiment comprises: the signal receiving processing circuit 110 of the radiofrequency signal of the satellite digital TV that receives being made pre-process; Described signal receiving processing circuit 110 output signals are done the tuning processing of digital television reception, the tuning circuit 120 of output baseband analog I/Q differential signal, its input connects the output of described signal receiving processing circuit 110; And the voltage conversion circuit 130 that working power is provided for described tuning circuit 120.
In conjunction with shown in Figure 2, described signal receiving processing circuit 110 comprises: the band pass filter 111 of the radiofrequency signal of satellite digital TV being made Filtering Processing; Connect described band pass filter 111, radiofrequency signal is made the low noise amplifier 112 of processing and amplifying; Connect described low noise amplifier 112, to the electric source filter circuit 113 of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
The radiofrequency signal of 950MHZ-2150MHZ is imported described band pass filter 111 by RF_IN, and described band pass filter 111 comprises capacitor C54 and microstrip line W1, with the target signal filter beyond the signal bandwidth; Then, radiofrequency signal reaches described low noise amplifier 112, the i.e. base stage of the first coupling capacitor input transistors Q20 that forms by the capacitor C75 and the C76 of serial connection through Y through the radiofrequency signal of microstrip line W1, Q20 makes processing and amplifying with radiofrequency signal by transistor; Through the collector electrode output of the radiofrequency signal after amplifying from transistor Q20, through capacitor C24 coupling, be divided into 2 the tunnel: the one tunnel by the radiofrequency signal of microstrip line W2 after and transport to described tuning circuit 120 through the second coupling capacitor C69 with processing and amplifying, another road is coupled through capacitor C77, and after the decay matching network circuit do decay matching treatment via resistor R 51, R52 and R53 composition, from loop output (RF_OUT2) output of tuner.Wherein, capacitor C79, C77 and C69 effect that the high-frequency noise of introducing from the loop output of tuner is isolated.
In addition, the output of described electric source filter circuit 113 is connected the base stage of transistor Q20, it will import power supply through a series of decoupling and Filtering Processing, the power supply signal of output+5V, guarantee to input to power supply signal pure of described low noise amplifier 112, avoided the noise in the power supply signal that the index of tuner is produced adverse influence.
In conjunction with shown in Figure 3, in the present embodiment, described tuning circuit 120 is to be the tuning chip U9 of CX24113A and to cooperate its peripheral circuit to realize with the model that CONEXANT company provides.Tuning chip U9 itself is the tuner of a high integration, low-power consumption, has reliability height, the outer few characteristics of assembly demand of sheet.The filter of its inner integrated low noise amplifier, integrator, base band bandwidth varying amplifier, automatic gain control, standard I
2Parts such as C serial line interface have been simplified design complexities.
Tuning chip U9 inner integrated low noise amplifier, AGC controller, quadrature phase detector, several baseband filters, phase-locked loop systems and control register etc.(frequency is 950MHZ-2150MHZ to the radiofrequency signal of being exported by capacitor C69 coupling, i.e. first intermediate-freuqncy signal) in the quadrature phase detector of input zero intermediate frequency, adjust signal amplitude by the AGC controller, by phase-locked loop systems control local oscillator frequencies, output phase is the clock pulse of 0 ° and 90 °, with the signal multiplication in the quadrature phase detector, be baseband analog I signal (interior phase signal) and baseband analog Q signal (orthogonal signalling) with the first intermediate-freuqncy signal frequency conversion; By the filter and the amplifier group of register controlled base band, realize the output of I/Q differential signal again.
In this process, the main control unit and the communicating by letter of demodulating unit of main circuit are to pass through I in tuning chip U9 and the digital television receiver
2The C signal bus is finished, this I
2The C signal bus need 4.7K resistance carry out 3.3V on draw.
In addition, tuning chip U9 needs the crystal oscillator of an outside that the most original frequency is provided, and crystal oscillator is 10.111MHZ.
In conjunction with Fig. 4, the power supply of tuning chip U9 is provided by voltage conversion circuit 130, this voltage conversion circuit 130 can become the 3.3V power supply signal with the 5V power source conversion of main circuit in the digital television receiver, for tuning chip U9 provides operate as normal required 3.3V power supply signal.Described voltage conversion circuit 130 is that the voltage stabilizing chip U10 of LD117A realizes converting the 5V power supply signal to the 3.3V power supply signal by model mainly; And cooperate power supply signal medium-high frequency signal is made electrolytic capacitor CE12 that decoupling handles and low frequency signal is made the electrolytic capacitor CE13 that decoupling is handled, stable with the voltage that guarantees input and output.
To sum up, the tuner that the utility model proposes than independent tuner, has low, the assembling worker of production cost The characteristics that order is few can be saved artificial, minimizing material, thereby be reduced the complete machine cost. In addition, height of the present utility model Frequently head is compared than existing tuner, has also improved Information Channel Index, has further reduced cost, simultaneously owing to changed tuning core The sheet solution, tuning chip provider has also used newer technology, so that the job stability of whole tuner is carried greatly Rise.
Claims (10)
1, a kind of tuner is characterized in that, comprising:
The radiofrequency signal of the satellite digital TV that receives is made the signal receiving processing circuit of pre-process;
Described signal receiving processing circuit output signal is done the tuning processing of digital television reception, the tuning circuit of output baseband analog I/Q differential signal, its input connects the output of described signal receiving processing circuit;
Wherein, described signal receiving processing circuit comprises:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
2, tuner according to claim 1 is characterized in that, described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, the coupling of the radiofrequency signal after the processing and amplifying exported to second coupling capacitor of described tuning circuit.
3, tuner according to claim 2 is characterized in that, described low noise amplifier also comprises:
Be connected the output of described amplifier element, the radiofrequency signal after the processing and amplifying be divided into the microstrip line of two-way;
Connecting described microstrip line, is the decay matching network circuit that the decay matching treatment is made in loop output with one tunnel radiofrequency signal wherein.
4, tuner according to claim 2, it is characterized in that described amplifier element is that base stage connects the output of described band pass filter and output, the collector electrode of described electric source filter circuit exported the radiofrequency signal after the processing and amplifying, the transistor of grounded emitter.
5, according to any one described tuner of claim 1 to 4, it is characterized in that, also comprise: for described tuning circuit provides the voltage conversion circuit of working power, it is connected with described tuning circuit.
6, a kind of satellite digital TV signal receiving processing circuit is characterized in that, comprising:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
7, satellite digital TV signal receiving processing circuit according to claim 6 is characterized in that described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, with second coupling capacitor of the coupling of the radiofrequency signal after processing and amplifying output.
8, satellite digital TV signal receiving processing circuit according to claim 7 is characterized in that described low noise amplifier also comprises:
Be connected the output of described amplifier element, the radiofrequency signal after the processing and amplifying be divided into the microstrip line of two-way;
Connect described microstrip line, one tunnel radiofrequency signal is wherein made the decay matching network circuit of decay matching treatment for realizing loop output.
9, a kind of satellite digital television receiving system comprises the antenna that is used for receiving satellite word TV signal at least; Connect described antenna, digital television signal is made the tuner of tuning processing; And the satellite digital tv receiver that connects described tuner; It is characterized in that described tuner comprises:
The radiofrequency signal of the satellite digital TV that receives is made the signal receiving processing circuit of pre-process;
Described signal receiving processing circuit output signal is done the tuning processing of digital television reception, the tuning circuit of output baseband analog I/Q differential signal, its input connects the output of described signal receiving processing circuit;
Wherein, described signal receiving processing circuit comprises:
The radiofrequency signal of satellite digital TV is made the band pass filter of Filtering Processing;
Connect described band pass filter, radiofrequency signal is made the low noise amplifier of processing and amplifying;
Connect described low noise amplifier, to the electric source filter circuit of making decoupling and Filtering Processing to the power supply of described low noise amplifier is provided.
10, satellite digital television receiving system according to claim 9 is characterized in that, described low noise amplifier comprises:
Radiofrequency signal is made the amplifier element of processing and amplifying;
Be connected first coupling capacitor between the input of the output of described band pass filter and described amplifier element;
Be connected the output of described amplifier element, the coupling of the radiofrequency signal after the processing and amplifying exported to second coupling capacitor of described tuning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201965905U CN201142720Y (en) | 2007-12-29 | 2007-12-29 | Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201965905U CN201142720Y (en) | 2007-12-29 | 2007-12-29 | Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system |
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| Publication Number | Publication Date |
|---|---|
| CN201142720Y true CN201142720Y (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201965905U Expired - Fee Related CN201142720Y (en) | 2007-12-29 | 2007-12-29 | Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system |
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| Country | Link |
|---|---|
| CN (1) | CN201142720Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131068A (en) * | 2011-01-16 | 2011-07-20 | 合肥润东通讯科技有限公司 | Digital TV (television) tuner and filtering method thereof |
| CN103401828A (en) * | 2013-07-30 | 2013-11-20 | 四川九洲空管科技有限责任公司 | DPSK radio frequency demodulating receiver |
| CN104469216A (en) * | 2015-01-04 | 2015-03-25 | 安徽波维电子科技有限公司 | C-band tuner facilitating noise coefficient regulation |
| CN106101665A (en) * | 2016-08-05 | 2016-11-09 | 北京华信泰科技股份有限公司 | A kind of satellite-signal processor |
-
2007
- 2007-12-29 CN CNU2007201965905U patent/CN201142720Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131068A (en) * | 2011-01-16 | 2011-07-20 | 合肥润东通讯科技有限公司 | Digital TV (television) tuner and filtering method thereof |
| CN103401828A (en) * | 2013-07-30 | 2013-11-20 | 四川九洲空管科技有限责任公司 | DPSK radio frequency demodulating receiver |
| CN104469216A (en) * | 2015-01-04 | 2015-03-25 | 安徽波维电子科技有限公司 | C-band tuner facilitating noise coefficient regulation |
| CN106101665A (en) * | 2016-08-05 | 2016-11-09 | 北京华信泰科技股份有限公司 | A kind of satellite-signal processor |
| CN106101665B (en) * | 2016-08-05 | 2022-04-19 | 北京华信泰科技股份有限公司 | Satellite signal processor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Beijing TongZhou era technology limited liability company Assignor: Shenzhen Tongzhou Electronic Co., Ltd. Contract record no.: 2010440020214 Denomination of utility model: Radio-frequency head, satellite digital television signal receiving and processing circuit and receiving system Granted publication date: 20081029 License type: Exclusive License Record date: 20101122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |