CN201393260Y - Tuner circuit of television set up box - Google Patents
Tuner circuit of television set up box Download PDFInfo
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- CN201393260Y CN201393260Y CN200920130101U CN200920130101U CN201393260Y CN 201393260 Y CN201393260 Y CN 201393260Y CN 200920130101 U CN200920130101 U CN 200920130101U CN 200920130101 U CN200920130101 U CN 200920130101U CN 201393260 Y CN201393260 Y CN 201393260Y
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Abstract
The utility model discloses a turner circuit of television set up box, which comprises a low noise amplifier, and further comprises an electronic switch and a frequency divider, a radio frequency signal input port is connected with the low noise amplifier, the low noise amplifier is connected with the frequency divider, and the frequency divider is used to output radio frequency signals amplified by low noise in two paths, and the second path of loop signals are connected with the electronic switch. The electronic switch is respectively connected with the frequency divider and a main board modulator, and is used to control, select and output modulating signals which are output by the main board modulator or loop signals of the second path to the radio frequency signal output end. The turner circuit can make users conveniently choose to watch digital television programs or analogy television programs through increasing an electric switch circuit in the modulator according to loop circuits or modulating signals which need to be selected and output, and riches the function of a digital television set up box.
Description
Technical field
The utility model relates to a kind of TV set-top box circuit, relates in particular to a kind of tuner circuit of TV set-top box.
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.
Top box of digital machine all adopted single head output in the past, can only export modulation signal, not band road output.And some user is when using TV set-top box to watch Digital Television, need sometimes to watch analog program with an other television set, generally holding wire to be extracted from set-top box and be inserted into the TV RF signals input, switching digital TV and simulated television need often to plug holding wire back and forth, have caused very big inconvenience to the user like this.
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 easily select the TV set-top box of loop signals output or modulation signal output.
Technical solutions of the utility model are:
A kind of tuner circuit of TV set-top box comprises low noise amplifier and rear end tuning circuit, and wherein, described tuner circuit also comprises electronic switch and frequency divider;
Radio-frequency (RF) signal input end connects described low noise amplifier, and low noise amplifier connects described frequency divider;
Described frequency divider is used to export the identical loop signals of two-way, and the second tunnel loop signals is inserted described electronic switch;
Described electronic switch links to each other with described frequency divider and mainboard modulator respectively, is used to control the modulation signal of selecting the described mainboard modulator output of output or described the second tunnel loop signals to the radiofrequency signal output.
Tuner circuit of the present invention, wherein, described tuner circuit also comprises the rear end tuning circuit, is used to receive the first via loop signals of described frequency divider output, and the output intermediate-freuqncy signal.
Tuner circuit of the present invention, wherein, described electronic switch comprises: loop signals module, modulation signal module, control module and signal output module; Wherein,
Described control module is used for selecting described loop signals module or modulation signal module are connected to described signal output module according to a control signal;
Described loop signals module is used to receive described the second tunnel loop signals, and described the second tunnel loop signals is sent to described signal output module;
Described modulation signal module is used to receive described modulation signal, and described modulation signal is sent to described signal output module;
Described signal output module is used for exporting described the second tunnel loop signals or described modulation signal to described radiofrequency signal output.
Tuner circuit of the present invention, wherein, described control module comprises the first switch triode V1, the base stage connection control signal of the described first switch triode V1, collector electrode connect power supply, grounded emitter by the first pull-up resistor R0;
Described loop signals module comprises the first diode D1, the positive pole of the described first diode D1 connects collector electrode and described the second tunnel loop signals of the described first switch triode V1, and the negative pole of the described first diode D1 is lower than the fixed voltage of described supply voltage value by resistance R 02 connection one;
Described modulation signal module comprises the second diode D2, the negative pole of the described second diode D2 connects collector electrode and the described modulation signal of the described first switch triode V1 by resistance R 01, and the positive pole of the described second diode D2 connects described fixed voltage by resistance R 02;
Described signal output module comprises the second filter capacitor C2, and the end of the described second filter capacitor C2 connects the negative pole of the described first diode D1 and the positive pole of the described second diode D2, and the other end connects described radiofrequency signal output; When described control signal control the described first switch triode V1 by the time, the first diode D1 conducting, described signal output module is exported described loop signals to described radiofrequency signal output; When described control signal is controlled the first switch triode V1 conducting, the second diode D2 conducting, described signal output module is exported described modulation signal to described radiofrequency signal output.
Tuner circuit of the present invention, wherein, described fixed voltage adopts the bleeder circuit that is connected between supply voltage and the ground to obtain.
Tuner circuit of the present invention, wherein, described the second tunnel loop signals connects the positive pole of the first diode D1 by the first filter capacitor C1.
Tuner circuit of the present invention, wherein, described modulation signal connects the negative pole of the second diode D2 by the 3rd filter capacitor C3.
Tuner circuit of the present invention, wherein, described electronic switch comprises a control signal port and a signal output port;
Described control signal port passes through the base stage that current-limiting resistance R9 inserts second switch triode V2, the grounded emitter of described second switch triode V2, and its collector electrode connects the positive pole of the 3rd diode D3 and the 4th diode D4;
The negative pole of described the 3rd diode D3 is by the 3rd divider resistance R3 ground connection, the end of the second divider resistance R2 is connected on the tie point of the negative pole of described the 3rd diode D3 and the 3rd divider resistance R3, the other end of the described second divider resistance R2 is by the end of first divider resistance R1 connection filter inductance L1, another termination DC power supply of described filter inductance L1;
The two ends of the described first divider resistance R1 the 4th filter capacitor C4 in parallel;
The positive pole of described the 3rd diode D3 and the 4th diode D4 connects described DC power supply by the second pull-up resistor R4;
The negative pole of described the 4th diode D4 connects described DC power supply by the 4th divider resistance R5;
The negative pole of described the 4th diode D4 is by the 5th divider resistance R6 ground connection; The negative pole of described the 4th diode D4 connects described signal output port by the 5th filter capacitor C5;
Described the second tunnel loop signals inserts the tie point of the 4th filter capacitor C4 and the first divider resistance R1;
The collector electrode of described second switch triode V2 connects the negative pole of the 5th diode D5 by bias resistance R7;
The positive pole of described the 5th diode D5 connects described DC power supply by described the 4th divider resistance R5; The positive pole of described the 5th diode D5 is by the 5th divider resistance R6 ground connection;
The positive pole of described the 5th diode D5 connects signal output port by described the 5th filter capacitor C5; Described modulation signal inserts the negative pole of described the 5th diode D5 by the 6th filter capacitor C6;
Described signal output port connects described radiofrequency signal output.
Tuner circuit of the present invention, wherein, signal output port is by output impedance build-out resistor R8 ground connection.
Tuner circuit of the present invention, wherein, DC power supply is by the 7th filter capacitor C7 ground connection.
The utility model is by increasing electronic switching circuit in the tuner of TV set-top box, select output loop signals or modulation signal as required, make the user can select to see digital television program easily or see analog television program, enriched the function of digital TV set-top box.
Description of drawings
Fig. 1 is the tuner circuit schematic diagram of the TV set-top box of the utility model embodiment 1;
Fig. 2 is the block diagram of the electronic switch embodiment 1 in the utility model tuner circuit;
Fig. 3 is the circuit diagram of the electronic switch embodiment 1 in the tuner circuit of the present utility model;
Fig. 4 is the circuit diagram of the electronic switch embodiment 2 in the utility model tuner circuit.
Embodiment
Below in conjunction with accompanying drawing, will be described in detail preferred embodiment of the present invention.
TV set-top box tuner circuit schematic diagram among the utility model embodiment 1 as shown in Figure 1, wherein tuner 100 comprises low noise amplifier 101 and rear end tuning circuit 104, it also comprises a frequency divider 102 and electronic switch 103, radiofrequency signal inserts described low noise amplifier 101 from radio-frequency (RF) signal input end, the radiofrequency signal of 101 pairs of inputs of low noise amplifier is carried out low noise and is amplified, the radiofrequency signal input frequency divider 102 after will amplifying then.Frequency divider 102 is used for radiofrequency signal is divided into the identical two-way loop signals of mutual isolation.Rear end tuning circuit 104 comprises High Amplifier Circuit, double-tuned circuit, mixing and amplifying circuit etc.The first via loop signals that frequency divider 102 produces is linked into the High Amplifier Circuit in the rear end tuning circuit 104, so that control automatically according to the power of signal by High Amplifier Circuit, entering into double-tuned circuit, double-tuned circuit then mainly is that out-of-band interference signal is carried out effective filtering, enter into main IC at last and carry out mixing and amplification, export a 44MHZ intermediate-freuqncy signal at last and offer mainboard rear end decoding circuit.The second tunnel loop signals of frequency divider 102 outputs is linked into electronic switch 103, electronic switch 103 also connects mainboard modulator 200, the mainboard modulator 200 of TV set-top box receives the input of AV baseband signal, the AV baseband signal is modulated to radio frequency gets on, and modulation signal is linked into electronic switch 103.Electronic switch 103 is used for selecting the output modulation signal or the second tunnel loop signals, and the signal the selected signal output port by electronic switch 103 is linked into the radiofrequency signal output.Wherein radiofrequency signal is that frequency is the broadband ATSC digital signal of 57-801MHZ.
Among the embodiment 1, electronic switch 103 schematic diagrames specifically as shown in Figure 2, it is made up of loop signals module 132, modulation signal module 133, control module 131 and signal output module 134.Control module 131 is selected described loop signals module 132 or modulation signal module 133 are connected to described signal output module 134 according to a control signal.Loop signals module 132 receives the second tunnel loop signals, and the second tunnel loop signals is sent to signal output module 134.Electronic switch 103 with the second tunnel loop signals or modulation signal output, exports selecteed signal to the radiofrequency signal output according to control signal control selection at last.
Electronic switch among the embodiment 1 can be circuit diagram as shown in Figure 3.Wherein, control module 131 is one first switch triode V1, and the base stage connection control signal of the first switch triode V1, collector electrode connect 5V power supply, grounded emitter by one first pull-up resistor R0.Loop signals module 132 is the first diode D1, and the positive pole of the first diode D1 connects the collector electrode of the first switch triode V1, and the negative pole of the first diode D1 is lower than the 2.5V fixed voltage of supply voltage value by resistance R 02 connection one.Modulation signal module 133 is the second diode D2, and the negative pole of the second diode D2 connects the collector electrode of the first switch triode V1 by resistance R 01, and the positive pole of the second diode D2 connects the 2.5V fixed voltage by resistance R 02.Signal output module 134 is the second filter capacitor C2, and the end of the second filter capacitor C2 connects the negative pole of the first diode D1 and the positive pole of the second diode D2, and the other end connects the radiofrequency signal output.The second tunnel loop signals connects the positive pole of the first diode D1 by the first filter capacitor C1.Modulation signal connects the negative pole of the second diode D2 by the 3rd filter capacitor C3.
In embodiment 1, when control signal was low level, the first switch triode V1 ended, the first diode D1 conducting, and loop signals exports the radiofrequency signal output to by the first diode D1 and the first filter capacitor C1; When control signal is high level, the first switch triode V1 conducting, the first diode D1 ends, the second diode D2 conducting, modulation signal exports the radiofrequency signal output to by the second diode D2 and the 3rd filter capacitor C3.
Among the utility model embodiment 2, the detailed circuit of electronic switch 103 as shown in Figure 4, to obtain exporting the electronic switching circuit of the more stable modulation signal or the second tunnel loop signals.Wherein, electronic switch 103 comprises a control signal port and a signal output port, control signal inserts the base stage of second switch triode V2 by current-limiting resistance R9, the grounded emitter of second switch triode V2, the collector electrode of second switch triode V2 connects the positive pole of the 3rd diode D3 and the 4th diode D4; The negative pole of the 3rd diode D3 is by the 3rd divider resistance R3 ground connection, the end of the second divider resistance R2 is connected on the tie point of the negative pole of the 3rd diode D3 and the 3rd divider resistance R3, the other end of the second divider resistance R2 is by the end of first divider resistance R1 connection filter inductance L1, the DC power supply of another termination 5V of filter inductance L1; The two ends of the first divider resistance R1 the 4th filter capacitor C4 in parallel; The positive pole of the 3rd diode D3 and the 4th diode D4 connects the DC power supply of 5V by the second pull-up resistor R4; The negative pole of the 4th diode D4 connects the DC power supply of 5V by the 4th divider resistance R5; The negative pole of the 4th diode D4 is by the 5th divider resistance R6 ground connection; The negative pole of the 4th diode D4 connects signal output port by the 5th filter capacitor C5; The second tunnel loop signals inserts the tie point of the 4th filter capacitor C4 and the first divider resistance R1.The collector electrode of second switch triode V2 connects the negative pole of the 5th diode D5 by bias resistance R7; The positive pole of the 5th diode D5 connects the DC power supply of 5V by the 4th divider resistance R5; The positive pole of the 5th diode D5 is by the 5th divider resistance R6 ground connection; The positive pole of the 5th diode D5 connects signal output port by the 5th filter capacitor C5; Modulation signal inserts the negative pole of the 5th diode D5 by the 6th filter capacitor C6; Signal output port is connected described radiofrequency signal output.
In embodiment 2, signal output port by output impedance build-out resistor R8 ground connection, is mated thereby reach output impedance, improve stable output signal.
In embodiment 2, DC power supply by the 7th filter capacitor C7 ground connection, is carried out filtering to the DC power supply of 5V, can improve anti-ripple voltage and power supply interference capability, guaranteed the stability of circuit working.
In embodiment 2, the concrete operation principle of electronic switching circuit is described below:
When radiofrequency signal after low noise amplifier amplifies, the identical loop signals of two-way that is divided into mutual isolation by frequency divider, first via loop signals is linked into the rear end tuning circuit, the second tunnel loop signals inserts the 4th filter capacitor C4 of electronic switch 103 and the tie point of the first divider resistance R1, and the modulation signal that complete machine provides inserts the negative pole of the 5th diode D5 by capacitor C 6.
When needs were selected the output loop signals to the radiofrequency signal output, through the base stage input low level signal of current-limiting resistance R9 to second switch triode V2, i.e. input was lower than the voltage of 0.7V by the signal input end mouth.This moment, second switch triode V2 did not possess turn-on condition, thereby V2 ends.
When described second switch triode V2 ends, its collector electrode, promptly the positive pole of D3 and D4 will obtain the DC power supply voltage through the 5V of pull-up resistor R4.Described divider resistance R1, R2 and R3 form a bleeder circuit, and this bleeder circuit passes through the DC power supply voltage that filter inductance L1 that direct current intercept to exchange connects 5V, reverse biased about 2.5V are provided for the 3rd diode D3.Described divider resistance R5 and R6 form a bleeder circuit, forward bias about 2.5V are provided for the 5th diode D5, reverse biased about 2.5V are provided for the 4th diode D4.At this moment, the negative pole of the 3rd diode D5 connects the collector electrode of V2 by bias resistance R7, and its cathode voltage is higher than its cathode voltage, so D3 and D4 conducting, and D5 ends.Therefore loop signals path conducting, the second tunnel loop signals that inserts this loop signals path is through the 4th a filter capacitor C4 by interchange obstruct direct current, and D3, D4 and C5 output to signal output port, and be connected to the radiofrequency signal output by this signal output port.
When needs are selected the output modulation signal to the radiofrequency signal output, through the base stage input high level of current-limiting resistance R9, promptly import voltage greater than 0.7V to V2 by the signal input end mouth.This moment, V2 possessed turn-on condition and conducting, and its collector electrode is pulled to electronegative potential.According to the analysis of front, at this moment, the cathode voltage of diode D3 and D4 causes D3 and D4 to end less than cathode voltage.And the 5th diode D5 cathode voltage causes the D5 conducting greater than cathode voltage.Therefore modulation signal path conducting, the modulation signal that inserts this modulation signal path outputs to signal output port through the 6th filter capacitor C6, D5 and C5, and is connected to the radiofrequency signal output by this signal output port.
In sum, the utility model is by increasing electronic switch in the tuner circuit of TV set-top box, select output loop signals or modulation signal as required, make the user can select to see digital television program easily or see analog television program, enriched the function of digital TV set-top box.
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 (10)
1, a kind of tuner circuit of TV set-top box comprises low noise amplifier and rear end tuning circuit, it is characterized in that described tuner circuit also comprises electronic switch and frequency divider;
Radio-frequency (RF) signal input end connects described low noise amplifier, and low noise amplifier connects described frequency divider;
Described frequency divider is used to export the identical loop signals of two-way, and the second tunnel loop signals is inserted described electronic switch;
Described electronic switch links to each other with described frequency divider and mainboard modulator respectively, is used to control the modulation signal of selecting the described mainboard modulator output of output or described the second tunnel loop signals to the radiofrequency signal output.
2, tuner circuit as claimed in claim 1 is characterized in that, described tuner circuit also comprises the rear end tuning circuit, is used to receive the first via loop signals of described frequency divider output, and the output intermediate-freuqncy signal.
3, tuner circuit as claimed in claim 1 or 2 is characterized in that, described electronic switch comprises: loop signals module, modulation signal module, control module and signal output module; Wherein,
Described control module is used for selecting described loop signals module or modulation signal module are connected to described signal output module according to a control signal;
Described loop signals module is used to receive described the second tunnel loop signals, and described the second tunnel loop signals is sent to described signal output module;
Described modulation signal module is used to receive described modulation signal, and described modulation signal is sent to described signal output module;
Described signal output module is used for exporting described the second tunnel loop signals or described modulation signal to described radiofrequency signal output.
4, tuner circuit as claimed in claim 3 is characterized in that, described control module comprises the first switch triode V1, and the base stage connection control signal of the described first switch triode V1, collector electrode connect power supply, grounded emitter by the first pull-up resistor R0;
Described loop signals module comprises the first diode D1, the positive pole of the described first diode D1 connects collector electrode and described the second tunnel loop signals of the described first switch triode V1, and the negative pole of the described first diode D1 is lower than the fixed voltage of described supply voltage value by resistance R 02 connection one;
Described modulation signal module comprises the second diode D2, the negative pole of the described second diode D2 connects collector electrode and the described modulation signal of the described first switch triode V1 by resistance R 01, and the positive pole of the described second diode D2 connects described fixed voltage by resistance R 02;
Described signal output module comprises the second filter capacitor C2, and the end of the described second filter capacitor C2 connects the negative pole of the described first diode D1 and the positive pole of the described second diode D2, and the other end connects described radiofrequency signal output; When described control signal control the described first switch triode V1 by the time, the first diode D1 conducting, described signal output module is exported described loop signals to described radiofrequency signal output; When described control signal is controlled the first switch triode V1 conducting, the second diode D2 conducting, described signal output module is exported described modulation signal to described radiofrequency signal output.
5, tuner circuit as claimed in claim 4 is characterized in that, described fixed voltage adopts the bleeder circuit that is connected between supply voltage and the ground to obtain.
6, tuner circuit as claimed in claim 4 is characterized in that, described the second tunnel loop signals connects the positive pole of the first diode D1 by the first filter capacitor C1.
7, tuner circuit as claimed in claim 4 is characterized in that, described modulation signal connects the negative pole of the second diode D2 by the 3rd filter capacitor C3.
8, tuner circuit as claimed in claim 1 is characterized in that, described electronic switch comprises a control signal port and a signal output port;
Described control signal port passes through the base stage that current-limiting resistance R9 inserts second switch triode V2, the grounded emitter of described second switch triode V2, and its collector electrode connects the positive pole of the 3rd diode D3 and the 4th diode D4;
The negative pole of described the 3rd diode D3 is by the 3rd divider resistance R3 ground connection, the end of the second divider resistance R2 is connected on the tie point of the negative pole of described the 3rd diode D3 and the 3rd divider resistance R3, the other end of the described second divider resistance R2 is by the end of first divider resistance R1 connection filter inductance L1, another termination DC power supply of described filter inductance L1;
The two ends of the described first divider resistance R1 the 4th filter capacitor C4 in parallel;
The positive pole of described the 3rd diode D3 and the 4th diode D4 connects described DC power supply by the second pull-up resistor R4;
The negative pole of described the 4th diode D4 connects described DC power supply by the 4th divider resistance R5;
The negative pole of described the 4th diode D4 is by the 5th divider resistance R6 ground connection; The negative pole of described the 4th diode D4 connects described signal output port by the 5th filter capacitor C5;
Described the second tunnel loop signals inserts the tie point of the 4th filter capacitor C4 and the first divider resistance R1;
The collector electrode of described second switch triode V2 connects the negative pole of the 5th diode D5 by bias resistance R7;
The positive pole of described the 5th diode D5 connects described DC power supply by described the 4th divider resistance R5; The positive pole of described the 5th diode D5 is by the 5th divider resistance R6 ground connection;
The positive pole of described the 5th diode D5 connects signal output port by described the 5th filter capacitor C5; Described modulation signal inserts the negative pole of described the 5th diode D5 by the 6th filter capacitor C6;
Described signal output port connects described radiofrequency signal output.
9, tuner circuit as claimed in claim 8 is characterized in that, signal output port is by output impedance build-out resistor R8 ground connection.
10, tuner circuit as claimed in claim 8 or 9 is characterized in that, DC power supply is by the 7th filter capacitor C7 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920130101U CN201393260Y (en) | 2009-02-04 | 2009-02-04 | Tuner circuit of television set up box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920130101U CN201393260Y (en) | 2009-02-04 | 2009-02-04 | Tuner circuit of television set up box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201393260Y true CN201393260Y (en) | 2010-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920130101U Expired - Lifetime CN201393260Y (en) | 2009-02-04 | 2009-02-04 | Tuner circuit of television set up box |
Country Status (1)
| Country | Link |
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| CN (1) | CN201393260Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601134A (en) * | 2015-01-30 | 2015-05-06 | 深圳市九洲电器有限公司 | Signal branching circuit and device |
| 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
- 2009-02-04 CN CN200920130101U patent/CN201393260Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601134A (en) * | 2015-01-30 | 2015-05-06 | 深圳市九洲电器有限公司 | Signal branching circuit and device |
| CN104601134B (en) * | 2015-01-30 | 2018-05-01 | 深圳市九洲电器有限公司 | signal branch circuit and device |
| 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 |
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| 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: Tuner circuit of television set up box Granted publication date: 20100127 License type: Exclusive License Record date: 20110413 |
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| CX01 | Expiry of patent term |
Granted publication date: 20100127 |
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| CX01 | Expiry of patent term |