CN201491153U - TV set top box tuner circuit with interactive receiving function - Google Patents
TV set top box tuner circuit with interactive receiving function Download PDFInfo
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- CN201491153U CN201491153U CN2009202041674U CN200920204167U CN201491153U CN 201491153 U CN201491153 U CN 201491153U CN 2009202041674 U CN2009202041674 U CN 2009202041674U CN 200920204167 U CN200920204167 U CN 200920204167U CN 201491153 U CN201491153 U CN 201491153U
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Abstract
The utility model discloses a TV set top box tuner circuit with an interactive receiving function, comprising a radio frequency signal input end, a radio frequency signal output end, a low noise amplifier, a frequency divider, a back end tuning and frequency mixing circuit and a matching circuit, wherein the radio frequency signal input end is connected with the frequency divider, the frequency divider is respectively connected with the low noise amplifier and the radio frequency signal output end through the matching circuit and is used for outputting two same paths of radio frequency signals, one path of radio frequency signals is connected with and transferred to the radiofrequency signal output end through the matching circuit, and the other path of radio frequency signals is output as intermediate frequency signals after sequentially passing through the matching circuit, the low noise amplifier and the back end tuning and frequency mixing circuit. In the utility model, by increasing the matching circuit in a tuner, a user can uplink transfer data from the radio frequency signal output end so as to carry out motions such as program on demand and the like, thereby the functions of a digital TV set top box are enriched.
Description
Technical field
The utility model relates to a kind of TV set-top box tuner circuit, relates in particular to a kind of TV set-top box tuner circuit with mutual receiving function.
Background technology
Along with the develop rapidly and the popularization of digital television techniques, apparatus of digital television receiving also increases day by day, because people's growth in the living standard, and more and more stronger to HD digital TV demand, the application of digital TV set-top box also more and more widely.
Existing DVB-C tuner product is mainly used in the set-top box product.Along with the development of Digital Television, common DVB-C top box of digital machine can not satisfy user's demand, and interactively DVB-C top box of digital machine has become following DVB-C top box of digital machine developing direction.The transmitting uplink data of present interactive DVB-C top box of digital machine is by increase a duplexer filter in set-top box inside to realize more, has not only increased the space size of set-top box, and cost is increased greatly.And if do not increase duplexer filter, the reverse transfer data are directly oppositely imported from the radiofrequency signal output, by also must amplifying through low noise behind the frequency divider, decay can not be as the transmitting uplink data path substantially more than 20dBuV.
Therefore, prior art is still waiting to improve and improve.
The utility model content
The purpose of this utility model is, at the above-mentioned shortcoming of prior art, provides a kind of tuner circuit that can carry out the TV set-top box of data upstream transmission.
Technical solutions of the utility model are:
A kind of TV set-top box tuner circuit with mutual receiving function, comprise radio-frequency (RF) signal input end, the radiofrequency signal output, low noise amplifier, the tuning mixting circuit in frequency divider and rear end, described tuner circuit also comprises a match circuit, described radio-frequency (RF) signal input end connects described frequency divider, described frequency divider is connected with low noise amplifier and radiofrequency signal output respectively by described match circuit, described frequency divider is used to export the identical radiofrequency signal of two-way, one tunnel radiofrequency signal is transferred to described radiofrequency signal output by described match circuit connection, and another road radiofrequency signal is successively by described match circuit, be intermediate-freuqncy signal output behind the tuning mixting circuit in low noise amplifier and rear end.
Described tuner circuit, wherein, described frequency divider comprises input, first output and second output, the input of described frequency divider connects described radio-frequency (RF) signal input end.
Described tuner circuit, wherein, described match circuit comprises first to the 5th resistance, described first resistance is connected between first and second outputs of described frequency divider, the second and the 3rd resistance string is coupled between first output and ground of described frequency divider, the the 4th and the 5th resistance string is coupled between second output and ground of described frequency divider, and described radiofrequency signal output is connected between the described second and the 3rd resistance, and described low noise amplifier is connected between the described the 4th and the 5th resistance.
Described tuner circuit, wherein, described frequency divider is the output of two-way radiofrequency signal symmetry with the radiofrequency signal frequency division of input, frequency divider and described first resistance are formed an impedance matching circuit, cooperate output impedance to be adjusted into 75 ohm with the described second and the 3rd resistance, and cooperate the impedance that will output to low noise amplifier also to be adjusted into 75 ohm with the described the 4th and the 5th resistance with described radiofrequency signal.
Described tuner circuit, wherein, described low noise amplifier comprises the 6th to the 13 resistance, first to the 7th electric capacity, first to the 3rd inductance, triode and zener diode, described first electric capacity, one end is connected between the 4th and the 5th resistance of described match circuit, the other end is connected an end of the 3rd inductance also by the first inductance ground connection by second with the 4th electric capacity successively, described second inductance, one end is connected between the described second and the 4th electric capacity, the other end is by the 3rd capacity earth, one end of described the 3rd inductance passes through the 6th grounding through resistance by the voltage-stabiliser tube ground connection other end, the base stage of described triode is connected between described the 3rd inductance and the 6th resistance, emitter is respectively by the 9th and the tenth grounding through resistance, collector electrode is successively by the 4th inductance, the 5th electric capacity is connected the other end of described the 3rd inductance with the 7th resistance, described the 8th resistance is connected between the collector electrode of described the 7th resistance and triode, the collector electrode of described triode is connected with the tuning mixting circuit in the 11 resistance and rear end by the 7th electric capacity successively, between the collector electrode and ground of described the 6th electric capacity connection and described triode, the 11 resistance one end passes through the 13 grounding through resistance by the 12 grounding through resistance other end.
The utility model makes the user enrich the function of digital TV set-top box from radiofrequency signal output uplink transmission data to carry out actions such as play-on-demand program by increase match circuit in tuner.
Description of drawings
Fig. 1 is the block diagram of the utility model better embodiment;
Fig. 2 is the circuit diagram of the utility model better embodiment.
Embodiment
Below in conjunction with accompanying drawing, will be described in detail better embodiment of the present utility model.
With reference to figure 1 and Fig. 2, the TV set-top box tuner circuit 10 of the utility model better embodiment comprises radio-frequency (RF) signal input end RFIN, radiofrequency signal output RFOUT, frequency divider 12, match circuit 14, low noise amplifier 16, and the tuning mixting circuit 18 in rear end, described radio-frequency (RF) signal input end RFIN connects described frequency divider 12, described frequency divider 12 is connected with low noise amplifier 16 and radiofrequency signal output RFOUT respectively by described match circuit 14, described frequency divider 12 is used for the received RF signal input, and the identical radiofrequency signal of output two-way, one tunnel radiofrequency signal is transferred to described radiofrequency signal output RFOUT by described match circuit 14 connections and exports as radiofrequency signal, and another road radiofrequency signal is successively by described match circuit 14, be tuned as intermediate-freuqncy signal output behind the tuning mixting circuit 18 in low noise amplifier 16 and rear end.
Described frequency divider coil S is that two coils coupling coiling forms, and it comprises an input and two outputs, and the input of described frequency divider coil S connects described radio-frequency (RF) signal input end RFIN.Described match circuit 14 comprises resistance R 1～R5, described resistance R 1 is parallel between two outputs of described frequency divider coil S, resistance R 2 and R3 are series between the output and ground of described frequency divider coil S, resistance R 4 and R5 are series between another output and ground of described frequency divider coil S, described radiofrequency signal output RFOUT is connected between described resistance R 2 and the R3, and described low noise amplifier 16 is connected between described resistance R 4 and the R5.
Described low noise amplifier 16 comprises resistance R 6～R13, capacitor C 1～C7, inductance L 1～L3, triode Q and zener diode D, described capacitor C 1 one ends are connected between the resistance R 4 and R5 of described match circuit 14, the other end is connected an end of inductance L 3 and passes through inductance L 1 ground connection by capacitor C 2 successively with C4, described inductance L 2 one ends are connected between described capacitor C 2 and the C4, the other end is by capacitor C 3 ground connection, one end of described inductance L 3 is by voltage-stabiliser tube D ground connection, the other end is by resistance R 6 ground connection, the base stage of described triode Q is connected between described inductance L 3 and the resistance R 6, emitter is respectively by resistance R 9 and R10 ground connection, collector electrode is successively by inductance L 4, capacitor C 5 is connected the other end of described inductance L 3 with resistance R 7, described resistance R 8 is connected between the collector electrode of described resistance R 7 and triode Q, the collector electrode of described triode is connected with the tuning mixting circuit 18 in resistance R 11 and rear end by capacitor C 7 successively, between the collector electrode and ground of described capacitor C 6 connections and described triode Q, resistance R 11 1 ends are by resistance R 12 ground connection, and the other end is by resistance R 13 ground connection.
The tuning mixting circuit 18 in rear end is a technology as well known to those skilled in the art in DVB-C tuner product, does not repeat them here.
In better embodiment of the present utility model, the incoming frequency scope 51MHZ～858MHZ of radiofrequency signal, the frequency 5MHz of up return path signal～42MHz.Described frequency divider coil S and described resistance R 1 are formed an impedance matching circuit, cooperate impedance to be adjusted into 75 ohm with described resistance R 2 and R3, and cooperate the impedance that will output to low noise amplifier 16 also to be adjusted into 75 ohm with described resistance R 4 and R5 with described radiofrequency signal output.Frequency divider coil S is formed by two coils coupling coiling, and the attenuation that makes uplink transmission data and downlink transmission data of the T type attenuator of forming with resistance R 2 and R3 is all about 5dB, so upward signal data and the transmission of downstream signal data are not impacted, simultaneously the attenuation of the π type attenuator formed of resistance R 1～R5 and frequency divider coil S is about 10dB, effectively reduced the interference of upward signal to the RF signal that enters tuning mixing.
In sum, the RF signal transmits into tuner 10 from radio-frequency (RF) signal input end RFIN, earlier through frequency divider 12, the RF signal is divided into two, one road RF signal is connected with radiofrequency signal output RFOUT by match circuit 14, and upstream data 5MHZ～42MHz passback path and RF signal downlink that this loop also can be used as interactive set-top box transmit data path; Another road RF signal amplifies by first order low noise, exports intermediate-freuqncy signal after entering the tuning mixting circuit in rear end again.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (5)
1. TV set-top box tuner circuit with mutual receiving function, comprise radio-frequency (RF) signal input end, the radiofrequency signal output, low noise amplifier, the tuning mixting circuit in frequency divider and rear end, it is characterized in that: described tuner circuit also comprises a match circuit, described radio-frequency (RF) signal input end connects described frequency divider, described frequency divider is connected with low noise amplifier and radiofrequency signal output respectively by described match circuit, described frequency divider is used to export the identical radiofrequency signal of two-way, one tunnel radiofrequency signal is transferred to described radiofrequency signal output by described up match circuit connection, and another road radiofrequency signal is successively by described up match circuit, be tuned as intermediate-freuqncy signal output behind the tuning mixting circuit in low noise amplifier and rear end.
2. tuner circuit as claimed in claim 1 is characterized in that, described frequency divider comprises input, first output and second output, and the input of described frequency divider connects described radio-frequency (RF) signal input end.
3. tuner circuit as claimed in claim 2, it is characterized in that, described up match circuit comprises first to the 5th resistance, described first resistance is connected between first and second outputs of described frequency divider, the second and the 3rd resistance string is coupled between first output and ground of described frequency divider, the the 4th and the 5th resistance string is coupled between second output and ground of described frequency divider, described radiofrequency signal output is connected between the described second and the 3rd resistance, and described low noise amplifier is connected between the described the 4th and the 5th resistance.
4. tuner circuit as claimed in claim 3, it is characterized in that, described frequency divider is the output of two-way radiofrequency signal symmetry with the radiofrequency signal frequency division of input, frequency divider and described first resistance are formed an impedance matching circuit, cooperate output impedance to be adjusted into 75 ohm with the described second and the 3rd resistance, and cooperate the impedance that will output to low noise amplifier also to be adjusted into 75 ohm with the described the 4th and the 5th resistance with described radiofrequency signal.
5. tuner circuit as claimed in claim 3, it is characterized in that, described low noise amplifier comprises the 6th to the 13 resistance, first to the 7th electric capacity, first to the 3rd inductance, triode and zener diode, described first electric capacity, one end is connected between the 4th and the 5th resistance of described match circuit, the other end is connected an end of the 3rd inductance also by the first inductance ground connection by second with the 4th electric capacity successively, described second inductance, one end is connected between the described second and the 4th electric capacity, the other end is by the 3rd capacity earth, one end of described the 3rd inductance passes through the 6th grounding through resistance by the voltage-stabiliser tube ground connection other end, the base stage of described triode is connected between described the 3rd inductance and the 6th resistance, emitter is respectively by the 9th and the tenth grounding through resistance, collector electrode is successively by the 4th inductance, the 5th electric capacity is connected the other end of described the 3rd inductance with the 7th resistance, described the 8th resistance is connected between the collector electrode of described the 7th resistance and triode, the collector electrode of described triode is connected with the tuning mixting circuit in the 11 resistance and rear end by the 7th electric capacity successively, between the collector electrode and ground of described the 6th electric capacity connection and described triode, the 11 resistance one end passes through the 13 grounding through resistance by the 12 grounding through resistance other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202041674U CN201491153U (en) | 2009-08-31 | 2009-08-31 | TV set top box tuner circuit with interactive receiving function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202041674U CN201491153U (en) | 2009-08-31 | 2009-08-31 | TV set top box tuner circuit with interactive receiving function |
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| Publication Number | Publication Date |
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| CN201491153U true CN201491153U (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202041674U Expired - Lifetime CN201491153U (en) | 2009-08-31 | 2009-08-31 | TV set top box tuner circuit with interactive receiving function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980178A (en) * | 2015-07-08 | 2015-10-14 | 泉州市琪祥电子科技有限公司 | Novel receiving circuit |
| CN107645641A (en) * | 2017-09-21 | 2018-01-30 | 深圳市九洲电器有限公司 | Set top box Tuner protectors and means of defence |
| CN110662098A (en) * | 2019-08-30 | 2020-01-07 | 上海仪电数字技术股份有限公司 | Signal frequency division device for cable television signal and cable television set top box |
-
2009
- 2009-08-31 CN CN2009202041674U patent/CN201491153U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980178A (en) * | 2015-07-08 | 2015-10-14 | 泉州市琪祥电子科技有限公司 | Novel receiving circuit |
| CN107645641A (en) * | 2017-09-21 | 2018-01-30 | 深圳市九洲电器有限公司 | Set top box Tuner protectors and means of defence |
| CN110662098A (en) * | 2019-08-30 | 2020-01-07 | 上海仪电数字技术股份有限公司 | Signal frequency division device for cable television signal and cable television set top box |
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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: Huizhou TCL King High Frequence El. Co.,Ltd. Assignor: TCL Group Co., Ltd. Contract record no.: 2011440020097 Denomination of utility model: TV set top box tuner circuit with interactive receiving function Granted publication date: 20100526 License type: Exclusive License Record date: 20110413 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100526 |
|
| CX01 | Expiry of patent term |