CN102196205A - Differential antenna and circuit control system of digital television - Google Patents
Differential antenna and circuit control system of digital television Download PDFInfo
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- CN102196205A CN102196205A CN2010101466763A CN201010146676A CN102196205A CN 102196205 A CN102196205 A CN 102196205A CN 2010101466763 A CN2010101466763 A CN 2010101466763A CN 201010146676 A CN201010146676 A CN 201010146676A CN 102196205 A CN102196205 A CN 102196205A
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Abstract
The invention discloses a differential antenna and a circuit control system of a digital television. The circuit control system comprises a differential mode antenna, a control unit and a switch circuit, wherein the differential mode antenna receives a broadcasting signal, and generates a differential radio frequency signal; the differential radio frequency signal comprises a first/positive signal and a second/negative signal; the control unit generates a selection signal according to a watched channel; the switch circuit comprises a plurality of matching circuits and a switch control circuit; each matching circuit can optimize a part of digital television bands; the switch control circuit receives the selection signal to control the positive and negative signals to generate an optimized positive signal and an optimized negative signal after passing through a first matching circuit and a second matching circuit respectively, transmits the optimized positive and negative signals to the control unit, and the first and second matching circuits optimize the same band; therefore, the control unit can generate a watched channel signal according to the optimized positive and negative signals.
Description
Technical field
The present invention relates to a kind of antenna and circuit control system thereof, particularly relate to a kind of differential type antenna and circuit control system thereof that applies to Digital Television.
Background technology
Please refer to Figure 1A, it is depicted as the known digital TV receiving system that applies in the main frame.In general, utilize main frame 100 to watch Digital Television all to need to utilize a DTV receiver (Digital TV receiver) 120 to be connected in a connectivity port (for example USB port) of main frame 100, and the application program of Digital Television is installed in main frame 100.Moreover, DTV receiver 120 comprises an antenna 125 and a control unit 128, antenna 125 can be used to the broadcast singal (Broadcasting signal) of receiving digital television, and control unit 128 can further be converted into the watched channel signal, this watched channel signal is the selected channel of user, and is sent to main frame 100.
Please refer to Figure 1B, it is depicted as the block schematic diagram of known digital television receiver.Control unit 128 in the DTV receiver 120 comprises a low noise amplifier (LNA) 150, band pass filter (BPF) 160 and a digital television module (DVB module) 170.And also comprise a radio-frequency tuner (RF tuner) 172 and one demodulator (demodulator) 174 in the digital television module 170.
At first, after low noise amplifier 150 amplified radiofrequency signal, (about 460MHz～870MHz) remained and is sent to digital television module 170 to band pass filter 160 with Digital Television frequency band in the radiofrequency signal.Moreover digital television module 170 captures the selected channel of user and exports the watched channel signal to main frame 100 according to user's indication, and main frame 100 can be shown in this channel on the screen.Wherein, radio-frequency tuner 172 is the indications according to the user, the frequency band of watched channel is reduced to fundamental frequency signal (base band signal), and demodulator 174 is that this fundamental frequency signal is carried out demodulation and is converted to the watched channel signal.
As everyone knows, digital television system now comprises the ISDB-T system of ATSC system, Japan and South America of European DVB-T system, the U.S., DMB-T/H system of China or the like, and the Digital Television frequency band of said system is between 460MHz～870MHz.And DVB-S satellite digital TV band system band is between 950MHz～2150MHz; ISDB-S satellite digital TV band system band is between 11.7GHz～12.2GHz.
Moreover, because antenna length and the receive frequency relation of being inversely proportional to, therefore, apply to relative bigger of the antenna size (size) of Digital Television now on the market, and can't be with Antenna Design in main frame 100, if painstakingly the size of antenna is dwindled then the receiving efficiency of antenna will reduce significantly.
Moreover, because electromagnetic interference (the Electro MagneticInterference of main frame 100 inside, EMI) very big, therefore, if antenna that will known Digital Television places main frame 100 inside, will cause reception bad or can't watch the situation generation of Digital Television because of electromagnetic interference is very big.
Summary of the invention
The objective of the invention is to propose a kind of differential type antenna and circuit control system thereof of Digital Television.Utilize different match circuits to optimize the signal of different frequency range, it is very little to make that the size of antenna can contract, and can in be built in the relevant electronic installation of any Digital Television and the differential radio frequency signal that antenna produced can be resisted the electromagnetic interference of electronics unit portion effectively.
The present invention proposes a kind of circuit control system of Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produce a differential radio frequency signal, and the differential radio frequency signal comprises a positive signal and a negative signal; One control unit is to produce one according to a watched channel to select signal; And one switches circuit, comprises a plurality of match circuits and an ON-OFF control circuit, and each match circuit can be optimized Digital Television frequency band partly; Wherein, the positive signal that generation was optimized after ON-OFF control circuit received and selects signal with one first match circuit in the described match circuit of control positive signal process is to control unit, the negative signal that produces optimization behind one second match circuit in the described match circuit of negative signal process is to control unit, and first match circuit is to optimize identical frequency band with second match circuit; Wherein, the positive signal of optimization and the negative signal of optimization are a differential optimization signal, and control unit receives differential optimization signal and is converted to a watched channel signal.
The present invention also proposes a kind of antenna circuit that applies to Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produce a differential radio frequency signal, and the differential radio frequency signal comprises a positive signal and a negative signal; And one switch circuit, comprise a plurality of match circuits and an ON-OFF control circuit, and each match circuit is a Digital Television frequency band of optimizing part; Wherein, ON-OFF control circuit receives one and selects signal to produce the positive signal of optimizing after controlling one first match circuit in the described match circuit of positive signal process, produce the negative signal of optimizing behind one second match circuit in the described match circuit of negative signal process, and the positive signal of optimizing and the negative signal of optimization are a differential optimization signal, and first match circuit is to optimize identical frequency band with second match circuit.
The present invention also proposes a kind of circuit control system of Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produces a differential radio frequency signal; One front-end circuit receives the differential radio frequency signal and is converted into a positive signal of amplifying and a negative signal that amplifies; One control unit is to produce one according to a watched channel to select signal; And one switch circuit, comprise a plurality of match circuits and an ON-OFF control circuit, and each match circuit can be optimized the Digital Television frequency band of part; Wherein, ON-OFF control circuit receives the selection signal and produce the positive signal of optimization to control unit after controlling one first match circuit in the described match circuit of positive signal process that amplifies, the negative signal that produces optimization behind one second match circuit in the described match circuit of negative signal process that amplifies is to control unit, and first match circuit is to optimize identical frequency band with second match circuit; Wherein, the positive signal of optimization and the negative signal of optimization are a differential optimization signal, and control unit receives differential optimization signal and is converted to a watched channel signal.
The present invention also proposes a kind of antenna circuit that applies to Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produces a differential radio frequency signal; One front-end circuit receives the differential radio frequency signal and is converted into a positive signal of amplifying and a negative signal that amplifies; And one switch circuit, comprise a plurality of match circuits and an ON-OFF control circuit, and each match circuit is a Digital Television frequency band of optimizing part; Wherein, ON-OFF control circuit receives one and selects signal to produce the positive signal of optimizing after controlling one first match circuit in the described match circuit of positive signal process that amplifies, produce the negative signal of optimizing behind one second match circuit in the described match circuit of negative signal process that amplifies, and the positive signal of optimizing and the negative signal of optimization are a differential optimization signal, and first match circuit is to optimize identical frequency band with second match circuit.
The present invention also proposes a kind of circuit control system of Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produces a differential radio frequency signal; One front-end circuit receives the differential radio frequency signal and produces one single-ended some signal; One digital television module produces one according to a watched channel and selects signal; And one switch circuit, comprise a plurality of match circuits and an ON-OFF control circuit, and each match circuit can be optimized the Digital Television frequency band of part; Wherein, ON-OFF control circuit receives and selects signal to produce the optimization signal of a single-ended point to digital television module after controlling single-ended one first match circuit in the described match circuit of signal process; Wherein, digital television module is a watched channel signal with the optimization conversion of signals of single-ended point.
The present invention also proposes a kind of antenna circuit that applies to Digital Television, in order to receive a Digital Television frequency band, comprising: a differential mode antenna receives a broadcast singal and produces a differential radio frequency signal; One front-end circuit receives the differential radio frequency signal and is converted to one single-ended some signal; And one switch circuit, comprise a plurality of match circuits and an ON-OFF control circuit, and each match circuit is a Digital Television frequency band of optimizing part; Wherein, ON-OFF control circuit receives one and selects signal to control the optimization signal that single-ended some signal produces a single-ended point after through one first match circuit in the described match circuit.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited.
Description of drawings
Figure 1A is depicted as the known digital TV receiving system that applies in the main frame.
Figure 1B is depicted as the block schematic diagram of known digital television receiver.
Figure 2 shows that the block schematic diagram of first embodiment of the invention DTV receiver.
Figure 3 shows that the block schematic diagram of the DTV receiver of first embodiment of the invention.
Fig. 4 A～4D is the schematic diagram of the various embodiment of match circuit of the present invention.
Figure 5 shows that the block schematic diagram of second embodiment of the invention DTV receiver.
Figure 6 shows that the block schematic diagram of third embodiment of the invention DTV receiver.
Embodiment
Please refer to Fig. 2, it is depicted as the digital TV receiving system schematic diagram of the embodiment of the invention.The digital TV receiving system of present embodiment is to design in the Free Region of main frame 200 screen edges.Yet the present invention is not limited only to design in main frame, and it can design in any electronic installation.For example digital TV set-top box (Set-Top Box) but, the television set of satellite digital TV receiver, automobile video/audio receiving device or receiving digital television or the like.
With Fig. 2 is example, this digital TV receiving system comprise a differential mode antenna (differential modeantenna) 210, switch circuit (switch circuit) 220, with a control unit 250.Wherein, differential mode antenna 210 is used for receiving broadcast signal and produce the differential radio frequency signal, and commutation circuit 220 is to be connected between differential mode antenna 210 and the control unit 250.It carries out frequency band optimization action according to the selected channel of user with the pairing special frequency band of this channel in the differential radio frequency signal, afterwards, exports this differential optimization signal.And control unit 250 becomes the selected watched channel signal of user with differential optimization conversion of signals and be sent to the internal circuit of main frame 200, makes main frame this watched channel can be shown on the screen.
In general, (common mode noise) is very strong for the common-mode noise that the electromagnetic interference (EMI) of main frame 200 or other electronic installation inside contains, and therefore, the present invention utilizes differential mode antenna 210 can suppress common-mode noise effectively.Moreover, in order to reduce the size of differential mode antenna 210 effectively, the present invention utilizes commutation circuit 220 that the corresponding frequency range of the selected channel of user is optimized, and export differential optimization signal to control unit 250, therefore the size of differential mode antenna can be contracted to below about 10cm easily, and is easy to design in the Free Region of screen edge.
Please refer to Fig. 3, it is depicted as the block schematic diagram of the DTV receiver of first embodiment of the invention.According to embodiments of the invention, differential mode antenna 210 is to utilize dipole antenna (dipole antenna) to realize.Certainly, except dipole antenna, coil antenna (loop antenna) also can be used as the differential mode antenna.And the differential radio frequency signal of differential mode antenna 210 outputs comprises one first (just) signal (S+) and one second (bearing) signal (S-).
Moreover commutation circuit comprises ON-OFF control circuit and a plurality of match circuit of being made up of a plurality of switch element Sw1～Sw4 221～228, and the switch element Sw1～Sw4 of exportable 2 the selection signal of control unit 250 to the commutation circuit 220.Wherein, match circuit 221～228 can be optimized at the different frequency bands in the Digital Television frequency band, and improves the receiving efficiency (receivingefficiency) of this frequency range.
For instance, when selecting signal to be " 00 ", the first switch element Sw1 can be with positive signal (S+) input 450-550MHz match circuit 221, and it can optimize the signal of 450-550MHz frequency range in the positive signal (S+), and the positive signal of optimizing (So+) is then exported by second switch cell S w2; When selecting signal to be " 01 ", the first switch element Sw1 can be with positive signal (S+) input 550-650MHz match circuit 223, it can optimize the signal of 550-650MHz frequency range in the positive signal (S+), and the positive signal of optimizing (So+) is then exported by second switch cell S w2; When selecting signal to be " 10 ", the first switch element Sw1 can be with positive signal (S+) input 650-750MHz match circuit 225, it can optimize the signal of 650-750MHz frequency range in the positive signal (S+), and the positive signal of optimizing (So+) is then exported by second switch cell S w2; When selecting signal to be " 11 ", the first switch element Sw1 can be with positive signal (S+) input 750-870MHz match circuit 227, it can optimize the signal of 750-870MHz frequency range in the positive signal (S+), and the positive signal of optimizing (So+) is then exported by second switch cell S w2.In like manner, the operating principle of the 3rd switch element Sw3, the 4th switch element Sw4 and 222,224,226,228 pairs of negative signals of match circuit (S-) is also identical, repeats no more.And the positive signal of optimizing (So+) is differential optimization signal with the negative signal of optimizing (So-).
Differential low noise amplifier 252 receptions in the front end circuit 251 are also amplified differential optimization signal.Afterwards, differential-single-ended converter 254 is the optimization signal and the input digit television module 256 of single-ended point (single ended) with differential optimization conversion of signals.And digital television module 256 is to select to capture the selected watched channel of user and be converted to the watched channel signal to main frame (perhaps electronic installation) in signal and the optimization signal by single-ended point according to user's indication output, and main frame (perhaps electronic installation) can be shown in this channel on the corresponding screen.Moreover radio-frequency tuner 257 is the indications according to the user, is fundamental frequency signal with the optimization conversion of signals of single-ended point, and demodulator 258 is to select signal according to user's indication output, and this fundamental frequency signal is carried out demodulation and is converted to the watched channel signal.
That is to say, when the user after having determined a watched channel on the main frame (perhaps electronic installation), this watched channel can be passed to digital television module 256.And the demodulator 258 in the digital television module 256 can output select signals to commutation circuit 220, makes digital television module 256 and to be converted into the watched channel signal with the optimization signal of the single-ended point that receives.For instance, suppose that the watched channel that the user selects is positioned at 650～750MHz, demodulator 258 can be exported the selection signal of " 10 " to switch element Sw1～Sw4.Therefore, positive signal (S+) can produce the positive signal of optimizing (So+) via 650～750MHz match circuit, 225 backs; In like manner, negative signal (S-) also can produce the negative signal of optimizing (So-) via 650～750MHz match circuit, 226 backs.Moreover after control unit 250 received differential optimization signal, behind differential low noise amplifier 252 and differential-single-ended converter 254, the optimization signal of single-ended point can input digit television module 256.And digital television module 256 be exportable watched channel signal to main frame (perhaps electronic installation) inside, and this watched channel is shown on the corresponding screen.
Moreover shown in Fig. 4 A～4D, match circuit of the present invention can utilize T type circuit or pi-network to realize.Wherein, the T type circuit among Fig. 4 A is connected in series two inductance L t1 and Lt2 between signal input part S and the signal output part So, and is connected a capacitor C t between the tie point of two inductance L t1, Lt2 and the earth terminal.T type circuit among Fig. 4 B is connected in series two inductance Ct1 and Ct2 between signal input part S and the signal output part So, and is connected an inductance L t between the tie point of two capacitor C t1, Ct2 and the earth terminal.Pi-network among Fig. 4 C is connected an inductance L p between signal input part S and the signal output part So, and is connected a capacitor C p1 between signal input part S and the earth terminal, is connected another capacitor C p2 between signal output part So and the earth terminal.Pi-network among Fig. 4 D is connected a capacitor C p between signal input part S and the signal output part So, and is connected an inductance L p1 between signal input part S and the earth terminal, is connected another inductance L p2 between signal output part So and the earth terminal.Moreover, utilize and adjust T type circuit or the inductance value of pi-network and the match circuit that capacitance can be realized different frequency bands.
From the above, the present invention utilizes commutation circuit to optimize the purpose that the differential mode antenna size is dwindled in the signals in different frequency bands realization.Certainly, those skilled in the art also can suitably revise and realize identical purpose according to disclosed commutation circuit.For instance, will add a common-mode filter (common mode filter) between the output of commutation circuit among Fig. 3 220 and differential low noise amplifier 252 inputs again in order to the complete filtering of common-mode noise.Below will introduce other relevant embodiment of the present invention in detail.
Please refer to Fig. 5, it is depicted as the block schematic diagram of the DTV receiver of second embodiment of the invention.DTV receiver comprise a differential mode antenna 310, front-end circuit 320, commutation circuit 330, with control unit 350.Wherein, front-end circuit 322 is differential low noise amplifier 322.
According to a second embodiment of the present invention, differential mode antenna 310 receiving broadcast signals are also exported the differential radio frequency signal, and it comprises a positive signal (S+) and a negative signal (S-).Moreover differential low noise amplifier 322 receives the differential radio frequency signal and is converted to the differential radio frequency signal of amplification, and it comprises a positive signal (Si+) of amplifying and a negative signal (Si-) that amplifies.
Moreover commutation circuit 330 comprises ON-OFF control circuit and a plurality of match circuit of being made up of a plurality of switch element Sw1～Sw4 331～338, and the switch element Sw1～Sw4 of exportable 2 the selection signal of control unit 350 to the commutation circuit 330.Wherein, match circuit 331～338 can be optimized at the different frequency bands in the Digital Television frequency band, and improves the receiving efficiency of this frequency range.
For instance, when selecting signal to be " 00 ", the first switch element Sw1 can be with positive signal (Si+) the input 450-550MHz match circuit 221 that amplifies, it can optimize the signal of 450-550MHz frequency range in the positive signal (Si+) of amplification, and then becomes the positive signal (So+) of optimization and exported by second switch cell S w2; When selecting signal to be " 01 ", the first switch element Sw1 can be with positive signal (Si+) the input 550-650MHz match circuit 223 that amplifies, it can optimize the signal of 550-650MHz frequency range in the positive signal (Si+) of amplification, and then becomes the positive signal (So+) of optimization and exported by second switch cell S w2; When selecting signal to be " 10 ", the first switch element Sw1 can be with positive signal (Si+) the input 650-750MHz match circuit 225 that amplifies, it can optimize the signal of 650-750MHz frequency range in the positive signal (Si+) of amplification, and then becomes the positive signal (So+) of optimization and exported by second switch cell S w2; When selecting signal to be " 11 ", the first switch element Sw1 can be with positive signal (Si+) the input 750-870MHz match circuit 227 that amplifies, it can optimize the signal of 750-870MHz frequency range in the positive signal (Si+) of amplification, and then becomes the positive signal (So+) of optimization and exported by second switch cell S w2.In like manner, the operating principle of the negative signal (Si-) of the 3rd switch element Sw3, the 4th switch element Sw4 and 332,334,336,338 pairs of amplifications of match circuit is also identical, repeats no more.And the positive signal of optimizing (So+) is differential optimization signal with the negative signal of optimizing (So-).
Control unit 350 comprises: a front end circuit 351 and a digital television module 256.And front end circuit 351 is differential-single-ended converter; And digital television module 356 comprises: a radio-frequency tuner 357 and a demodulator 358
Differential-single-ended converter 352 is the optimization signal and the input digit television module 356 of single-ended point (single ended) with differential optimization conversion of signals.And digital television module 356 is selected to capture the selected watched channel of user and be converted to the watched channel signal to main frame (perhaps electronic installation) in signal and the optimization signal by single-ended point according to user's indication output, and main frame (perhaps electronic installation) can be shown in this channel on the corresponding screen.Moreover radio-frequency tuner 357 is according to user's indication, be fundamental frequency signal with the optimization conversion of signals of single-ended point, and demodulator 358 selected signal according to user's indication output, and this fundamental frequency signal is carried out demodulation and is converted to the watched channel signal.
That is to say, when the user after having determined a watched channel on the main frame (perhaps electronic installation), this watched channel can be passed to digital television module 356.And the demodulator 358 in the digital television module 356 can output select signals to commutation circuit 330, makes digital television module 356 and to be converted into the watched channel signal with the optimization signal of the single-ended point that receives.For instance, suppose that the watched channel that the user selects is positioned at 650～750MHz, demodulator 358 can be exported the selection signal of " 10 " to switch element Sw1～Sw4.Therefore, the positive signal of amplification (Si+) can produce the positive signal of optimizing (So+) via 650～750MHz match circuit, 335 backs; In like manner, the negative signal of amplification (Si-) also can produce the negative signal of optimizing (So-) via 650～750MHz match circuit, 336 backs.Moreover after control unit 350 received differential optimization signal, behind differential-single-ended converter 352, the optimization signal of single-ended point can input digit television module 356.And digital television module 356 be exportable watched channel signal to main frame (perhaps electronic installation) inside, and this watched channel is shown on the corresponding screen.
Certainly, add common-mode filter in front-end circuit 320 that those skilled in the art also can be in a second embodiment or the front end circuit 351 in order to the complete filtering of common-mode noise.
Please refer to Fig. 6, it is depicted as the block schematic diagram of the DTV receiver of third embodiment of the invention.DTV receiver comprises: a differential mode antenna 410, front-end circuit 420, commutation circuit 430, with control unit 450.Wherein, but differential mode antenna 410 receiving broadcast signals and be converted into the differential radio frequency signal, and the differential radio frequency signal comprises a positive signal (S+) and a negative signal (S-).
Moreover commutation circuit 430 comprises ON-OFF control circuit and a plurality of match circuit of being made up of a plurality of switch element Sw1～Sw2 432～435, and the switch element Sw1～Sw2 of exportable 2 the selection signal of digital television module 450 to the commutation circuit 430.Wherein, match circuit 432～435 can be optimized at the different frequency bands in the Digital Television frequency band, and improves the receiving efficiency of this frequency range.
For instance, when selecting signal to be " 00 ", the first switch element Sw1 can be with single-ended some signal (S) input 450-550MHz match circuit 432, it can optimize the signal of 450-550MHz frequency range in the single-ended some signal (S), and the optimization signal (So) of single-ended point is then exported by second switch cell S w2; When selecting signal to be " 01 ", the first switch element Sw1 can be with single-ended some signal (S) input 550-650MHz match circuit 433, it can optimize the signal of 550-650MHz frequency range in the single-ended some signal (S), and the optimization signal (So) of single-ended point is then exported by second switch cell S w2; When selecting signal to be " 10 ", the first switch element Sw1 can be with single-ended some signal (S) input 650-750MHz match circuit 434, it can optimize the signal of 650-750MHz frequency range in the single-ended some signal (S), and the optimization signal (So) of single-ended point is then exported by second switch cell S w2; When selecting signal to be " 11 ", the first switch element Sw1 can be with single-ended some signal (S) input 750-870MHz match circuit 227, it can optimize the signal of 750-870MHz frequency range in the single-ended some signal (S), and the optimization signal (So) of single-ended point is then exported by second switch cell S w2.
That is to say, when the user after having determined a watched channel on the main frame (perhaps electronic installation), this watched channel can be passed to digital television module 450.And the demodulator 458 in the digital television module 450 can output select signals to commutation circuit 458, make the single-ended point that digital television module 450 will receive the optimization signal and be converted into the watched channel signal.For instance, suppose that the watched channel that the user selects is positioned at 650～750MHz, demodulator 458 can be exported the selection signal of " 10 " to switch element Sw1～Sw2.Therefore, single-ended some signal (S) can produce the optimization signal (So) of single-ended point via 650～750MHz match circuit, 434 backs.Moreover, the optimization signal (So) that digital television module 450 receives single-ended point be exportable watched channel signal to main frame (perhaps electronic installation) inside, and this watched channel is shown on the corresponding screen.
In addition, the present invention does not limit the number of match circuit, and those skilled in the art also can design the match circuit of different frequency range, and the ON-OFF control circuit of the switch element of arranging in pairs or groups different composition realizes the effect of commutation circuit of the present invention.Moreover, though above-mentioned antenna and DTV receiver thereof are example with the Digital Television frequency band of 460MHz～870MHz, can certainly be applied to DVB-S satellite digital TV system or ISDB-S satellite digital TV system.
Moreover, those skilled in the art also can change the design of front end circuit, for example, in the 3rd embodiment,, can with the differential radio frequency conversion of signals single-ended some signal also with differential low noise amplifier in the front-end circuit 420 422 and differential-single-ended some transducer 424 place-exchange.
Moreover, though though the present invention applies to the antenna circuit and the receiving system thereof of Digital Television designs in computer system (or electronic installation), yet be not only be defined in built-in in the inner digital TV receiving system of main frame (or electronic installation).Those skilled in the art also can design receiving system of the present invention in main frame (or electronic installation) outside, also can realize effect of the present invention effectively.
In sum; though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art; under the premise without departing from the spirit and scope of the present invention; can do various changes and retouching, so protection scope of the present invention is as the criterion with claim of the present invention.
Claims (24)
1. the circuit control system of a Digital Television in order to the receiving digital television frequency band, is characterized in that, comprising:
The differential mode antenna, receiving broadcast signal also produces the differential radio frequency signal, and above-mentioned differential radio frequency signal comprises positive signal and negative signal;
Control unit produces the selection signal according to watched channel; And
Commutation circuit comprises a plurality of match circuits and ON-OFF control circuit, and each above-mentioned match circuit optimization above-mentioned Digital Television frequency band partly; Wherein, above-mentioned ON-OFF control circuit receives above-mentioned selection signal and produce the above-mentioned positive signal of optimization to above-mentioned control unit after controlling first match circuit in above-mentioned these match circuits of above-mentioned positive signal process, the above-mentioned negative signal that produces optimization behind second match circuit in above-mentioned these match circuits of above-mentioned negative signal process is to above-mentioned control unit, and above-mentioned first match circuit is to optimize identical frequency band with above-mentioned second match circuit;
Wherein, the above-mentioned positive signal of optimization and the above-mentioned negative signal of optimization are differential optimization signal, and above-mentioned control unit receives above-mentioned differential optimization signal and is converted to the watched channel signal.
2. circuit control system according to claim 1 is characterized in that, above-mentioned differential mode antenna is dipole antenna or coil antenna.
3. circuit control system according to claim 1 is characterized in that, above-mentioned control unit comprises:
Front end circuit receives above-mentioned differential optimization signal and produces the optimization signal of single-ended point; And
Digital television module is above-mentioned watched channel signal according to above-mentioned watched channel with the optimization conversion of signals of above-mentioned single-ended point.
4. circuit control system according to claim 3 is characterized in that, above-mentioned front end circuit comprises:
Differential low noise amplifier receives and amplifies above-mentioned differential optimization signal; And
Differential-single-ended converter, with the above-mentioned differential optimization conversion of signals of the amplifying optimization signal that is above-mentioned single-ended point.
5. circuit control system according to claim 3 is characterized in that, above-mentioned digital television module comprises:
Radio-frequency tuner, according to above-mentioned watched channel, changing the frequency range of stating watched channel in the optimization signal transfer of above-mentioned single-ended point becomes fundamental frequency signal; And
Demodulator is exported above-mentioned selection signal according to above-mentioned watched channel, and above-mentioned fundamental frequency signal is converted to above-mentioned watched channel signal.
6. circuit control system according to claim 3 is characterized in that, above-mentioned front end circuit comprises: differential-single-ended converter, and with the above-mentioned differential optimization conversion of signals of the amplifying optimization signal that is above-mentioned single-ended point.
7. circuit control system according to claim 1 is characterized in that above-mentioned control unit also is connected to electronic installation, and above-mentioned electronic installation provides above-mentioned watched channel to above-mentioned control unit and receive above-mentioned watched channel signal.
8. circuit control system according to claim 7 is characterized in that, above-mentioned electronic installation is the television set of main frame, digital TV set-top box, satellite digital TV receiver, automobile video/audio receiving device or receiving digital television.
9. circuit control system according to claim 1 is characterized in that, T type circuit or pi-network that each above-mentioned match circuit is made up of electric capacity and inductance.
10. circuit control system according to claim 1 is characterized in that, also comprises differential low noise amplifier, is connected between above-mentioned differential mode antenna and the above-mentioned commutation circuit, and above-mentioned differential low noise amplifier is in order to reception and amplify above-mentioned differential optimization signal.
11. an antenna circuit that applies to Digital Television in order to the receiving digital television frequency band, is characterized in that, comprising:
The differential mode antenna, receiving broadcast signal also produces the differential radio frequency signal, and above-mentioned differential radio frequency signal comprises positive signal and negative signal; And
Commutation circuit comprises a plurality of match circuits and ON-OFF control circuit, and each above-mentioned match circuit is to optimize above-mentioned Digital Television frequency band partly;
Wherein, above-mentioned ON-OFF control circuit receives selects signal to produce the above-mentioned positive signal of optimizing after controlling first match circuit in above-mentioned these match circuits of above-mentioned positive signal process, produce the above-mentioned negative signal of optimizing behind second match circuit in above-mentioned these match circuits of above-mentioned negative signal process, and the above-mentioned positive signal of optimizing and the above-mentioned negative signal of optimization are differential optimization signal, and above-mentioned first match circuit is to optimize identical frequency band with above-mentioned second match circuit.
12. antenna circuit according to claim 11 is characterized in that, above-mentioned differential mode antenna is dipole antenna or coil antenna.
13. antenna circuit according to claim 12 is characterized in that, T type circuit or pi-network that each above-mentioned match circuit is made up of electric capacity and inductance.
14. antenna circuit according to claim 1 wherein, also includes differential low noise amplifier, is connected between above-mentioned differential mode antenna and the above-mentioned commutation circuit, above-mentioned differential low noise amplifier is in order to reception and amplify above-mentioned differential optimization signal.
15. the circuit control system of a Digital Television in order to the receiving digital television frequency band, is characterized in that, comprising:
The differential mode antenna, receiving broadcast signal also produces the differential radio frequency signal;
Front-end circuit receives above-mentioned differential radio frequency signal and produces single-ended some signal;
Digital television module produces the selection signal according to watched channel; And
Commutation circuit comprises a plurality of match circuits and ON-OFF control circuit, and each above-mentioned match circuit optimization above-mentioned Digital Television frequency band partly; Wherein, above-mentioned ON-OFF control circuit receives above-mentioned selection signal and produce the optimization signal of single-ended point to above-mentioned digital television module after controlling first match circuit in above-mentioned these match circuits of above-mentioned single-ended some signal process;
Wherein, above-mentioned digital television module is the watched channel signal with the optimization conversion of signals of above-mentioned single-ended point.
16. circuit control system according to claim 15 is characterized in that, above-mentioned differential mode antenna is dipole antenna or coil antenna.
17. circuit control system according to claim 15 is characterized in that, above-mentioned front-end circuit comprises:
Differential low noise amplifier receives and amplifies above-mentioned differential radio frequency signal; And
Differential-single-ended converter, be above-mentioned single-ended some signal with the above-mentioned differential radio frequency conversion of signals of amplifying.
18. circuit control system according to claim 15 is characterized in that, above-mentioned digital television module comprises:
Radio-frequency tuner, according to above-mentioned watched channel, changing the frequency range of stating watched channel in the optimization signal transfer of above-mentioned single-ended point becomes fundamental frequency signal; And
Demodulator is exported above-mentioned selection signal according to above-mentioned watched channel, and above-mentioned fundamental frequency signal is converted to above-mentioned watched channel signal.
19. circuit control system according to claim 15 is characterized in that, above-mentioned digital television module also is connected to electronic installation, and above-mentioned electronic installation provides above-mentioned watched channel to above-mentioned digital television module and receive above-mentioned watched channel signal.
20. circuit control system according to claim 15 is characterized in that, above-mentioned electronic installation is the television set of main frame, digital TV set-top box, satellite digital TV receiver, automobile video/audio receiving device or receiving digital television.
21. circuit control system according to claim 15 is characterized in that, T type circuit or pi-network that each above-mentioned match circuit is made up of electric capacity and inductance.
22. an antenna circuit that applies to Digital Television in order to the receiving digital television frequency band, is characterized in that, comprising:
The differential mode antenna, receiving broadcast signal also produces the differential radio frequency signal;
Front-end circuit receives above-mentioned differential radio frequency signal and is converted to single-ended some signal; And
Commutation circuit comprises a plurality of match circuits and ON-OFF control circuit, and each above-mentioned match circuit is to optimize above-mentioned Digital Television frequency band partly;
Wherein, above-mentioned ON-OFF control circuit receives and selects signal to control the optimization signal that above-mentioned single-ended some signal produces single-ended point after through first match circuit in above-mentioned these match circuits.
23. antenna circuit according to claim 22 is characterized in that, above-mentioned differential mode antenna is dipole antenna or coil antenna.
24. antenna circuit according to claim 22 is characterized in that, T type circuit or pi-network that each above-mentioned match circuit is made up of electric capacity and inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101466763A CN102196205A (en) | 2010-03-15 | 2010-03-15 | Differential antenna and circuit control system of digital television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101466763A CN102196205A (en) | 2010-03-15 | 2010-03-15 | Differential antenna and circuit control system of digital television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102196205A true CN102196205A (en) | 2011-09-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101466763A Pending CN102196205A (en) | 2010-03-15 | 2010-03-15 | Differential antenna and circuit control system of digital television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102196205A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103022732A (en) * | 2011-09-23 | 2013-04-03 | 富港电子（东莞）有限公司 | Impedance matching method of antennas |
| CN103187628A (en) * | 2011-12-28 | 2013-07-03 | 北京光宝移动电子电信部件有限公司 | Antenna device for receiving radio broadcasting signal |
| CN103457041A (en) * | 2013-08-19 | 2013-12-18 | 小米科技有限责任公司 | Antenna circuit, controller, modulator-demodulator and circuit controlling method and terminal |
| CN105226387A (en) * | 2014-06-30 | 2016-01-06 | 泰科电子(上海)有限公司 | Antenna assembly |
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| DE20320731U1 (en) * | 2003-10-30 | 2005-01-20 | Kathrein-Werke Kg | Reception system for digital terrestrial signals e.g. digital video broadcast television signals, has antenna device attached to personal computer in alternate positions for reception of horizontally or vertically polarized signals |
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| US4381566A (en) * | 1979-06-14 | 1983-04-26 | Matsushita Electric Industrial Co., Ltd. | Electronic tuning antenna system |
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| DE20320731U1 (en) * | 2003-10-30 | 2005-01-20 | Kathrein-Werke Kg | Reception system for digital terrestrial signals e.g. digital video broadcast television signals, has antenna device attached to personal computer in alternate positions for reception of horizontally or vertically polarized signals |
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| CN103022732A (en) * | 2011-09-23 | 2013-04-03 | 富港电子（东莞）有限公司 | Impedance matching method of antennas |
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| CN105226387A (en) * | 2014-06-30 | 2016-01-06 | 泰科电子(上海)有限公司 | Antenna assembly |
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Application publication date: 20110921 |