CN103945149A - Multiple-complex system of high efficiency digital television transmitter and implementing method thereof - Google Patents
Multiple-complex system of high efficiency digital television transmitter and implementing method thereof Download PDFInfo
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- CN103945149A CN103945149A CN201410173626.2A CN201410173626A CN103945149A CN 103945149 A CN103945149 A CN 103945149A CN 201410173626 A CN201410173626 A CN 201410173626A CN 103945149 A CN103945149 A CN 103945149A
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Abstract
The invention relates to a multiple-complex system of a high efficiency digital television transmitter and an implementing method thereof. The multiple-complex system comprises a radio frequency input, a power distributor, a main amplifier, an auxiliary amplifier, a wave length transmission line and a load. The radio frequency input is connected with the power distributor, the other end of the power distributor is respectively connected with the main amplifier and the auxiliary amplifier, the other end of the main amplifier is connected with the wave length transmission line, the other end of the auxiliary amplifier is respectively connected with the wave length transmission line and the load. The implementing method of the multiple-complex system comprises the steps of enabling the power distributor to distribute a radio frequency input signal, transmitting one signal to the main amplifier and transmitting the amplified signal to the quarter-wave transmission line; transmitting the other signal to the auxiliary amplifier, transmitting the amplified signal to the quarter-wave transmission line and then performing processing for output. By adopting the multiple-complex system of the high efficiency digital television transmitter and the implementing method and under the condition that the linear requirement of the system is fully met, the efficiency can be remarkably improved, the efficiency of a traditional high-power digital television transmitter can be improved from 10%-13% to 30%-35%, energy is saved, and the cost is reduced.
Description
Technical field
The invention belongs to the communications field, relate to a kind of how fit technology of high-efficiency digital television transmitter, be specially a kind of how fit system and implementation method thereof.
Background technology
Along with the develop rapidly of digital television techniques, the OFDM modulation system that the availability of frequency spectrum is higher is widely applied.Mean value and envelope peak that a common feature of these modulation signals is signal powers there are differences, and have caused PAR peak to average ratio larger, and this just requires amplifier must have good linear characteristic.Otherwise, be subject to nonlinear impact, will cause signal spectrum regeneration, cause the deteriorated of MER index, thereby affect the covering quality of signal.In order to meet the linearity in transmitting dynamic range, require the power amplifier in system to must operate at saturated rollback region.
In traditional Designing power amplifier, linear and these two important indicators of efficiency are afoul mutually.How in the wide range of linearity, to keep high efficiency, become the challenging task of tool in current power amplifier design.In high power digital television transmitter, high power amplifier is marginal to the price tool of complete machine, and meanwhile, high power amplifier is also power consumption parts maximum in digital TV transmitter, and its efficiency is a significant design index.High efficiency can energy savings, reduces the design complexities of power amplifier cooling system, improves the stability of power amplifier, builds and the object of operating cost thereby reach to reduce.
Along with the develop rapidly of digital television techniques, how to improve linearity and the efficiency of equipment, just become key, how fit technology is exactly the linearity of raising equipment and the key technology of efficiency.
Summary of the invention
Task of the present invention is to provide a kind of how fit system and implementation method thereof of high-efficiency digital television transmitter, applies how fit technology, has solved high linearity and the high efficiency problem of digital TV transmitter; In the situation that meeting system linear requirement completely, significantly raising efficiency, can, by improved efficiency to 30%～35% of traditional high power digital television transmitter 10%～13%, greatly save the energy, has reduced cost.
Technical solution of the present invention is as follows:
A how fit system for high-efficiency digital television transmitter, it comprises radio frequency input RFin, power divider PS, main amplifier MAIN, booster amplifier AUX, wavelength transmission line QWTL and load Load;
Wherein: radio frequency input RFin meets power divider PS, the power divider PS other end meets respectively main amplifier MAIN and booster amplifier AUX, another termination wavelength transmission line of main amplifier MAINS QWTL, the booster amplifier AUX other end meets respectively wavelength transmission line QWTL and load Load.
The implementation method of the how fit system of described high-efficiency digital television transmitter, radio frequency input RFin signal is after power divider PS, and wherein main amplifier MAIN is delivered on a road, after main amplifier amplifies, delivers to quarter-wave transmission line QWTL; Booster amplifier AUX is delivered on radio frequency input RFin signal another road after power divider PS, delivers to quarter-wave transmission line QWTL, output after quarter-wave transmission line QWTL processes after amplifying.
The present invention applies how fit technology, the double pipe structure that uses major-minor pipe, adopts independently biasing circuit and match circuit, adopts load traction theory and major-minor pipe folding, coordinate digital pre-distortion technology, make high linearity and the high efficiency of high power amplifier reach perfect adaptation.
The how fit system of high-efficiency digital television transmitter of the present invention and the how fit technology of implementation method application thereof, wherein high power amplifier is in the situation that meeting system linear requirement completely, efficiency is significantly promoted, can, by improved efficiency to 30%～35% of traditional high power digital television transmitter 10%～13%, greatly save the energy.Adopt the high power digital television transmitter of how fit technology and digital pre-distortion technology to there is the feature of high efficiency, high linearity and high reliability, meanwhile, can make compact equipment, with low cost.
Adopt the high-efficiency digital television transmitter of how fit technology to there is following major function:
1, two dissimilar power tube collaborative works, ensure high efficiency.Adopt AB class power tube, supervisor amplifies carrier power under voltage level, thereby ensures high efficiency; Adopt C class power tube, looped pipeline provides extra voltage in the time of modulation crest.
2, adopt different voltage offset electric circuits and match circuit independently.Adopt different voltage offset electric circuits to become more meticulous and regulate the operating state of power tube, meanwhile, use temperature-compensation circuit to ensure the temperature stability of power tube; The front and back level match circuit of independent design major-minor pipe, designs the mixer of 90 ° simultaneously and synthesizes major-minor amplifier with the impedance transformer of 90 ° of skews, makes power amplifier reach optimum efficiency.
3, quarter-wave transmission line He road circuit is used for realizing rational load-modulate between supervisor and load.In the time that reaching capacity, supervisor's voltage reduces to be responsible for impedance, constant thereby increasing electric current carrys out guaranteed efficiency.
Adopt the high-efficiency digital television transmitter of how fit technology to form the following advantage of product:
1, efficient, the energy-saving and emission-reduction of complete machine.The ratio that traditional high power amplifier occupies digital TV transmitter Overall Power Consumption is very large.Adopt how fit technology, load traction technique, quarter-wave transmission line transmission can improve significantly high power amplifier efficiency.Single-stage efficiency can reach 50%, and overall efficiency can reach 30%～35%, greatly reduces the Overall Power Consumption of transmitter, has greatly saved the energy.
2, the linearity is good.Adopt the high power amplifier of how fit technology, when in the regional extent of power output rollback 6dB, PAE is higher, amplifier still can be operated in the range of linearity.Meanwhile, adopt the digital pre-distortion technology of linearized system, improved widely the linearity of complete machine, met the modulation signal of high peak-to-average force ratio completely to the index request of complete machine.
3, reliability is high.Adopt the high power amplifier of how fit technology efficiently, reduced the power consumption of complete machine, reduced the design complexities of heat radiating system of whole machine and power-supply system, make complete machine structure simpler, thereby improved stability and the reliability of complete machine.
4, implementation method is simple, with low cost.Adopt load traction technique and quarter-wave transmission line synthetic, the method that technology is realized is simpler, and greatly reduces cost.In actual production debugging, easily realize, be easy to batch production.
How fit the implementation method of the system of high-efficiency digital television transmitter of the present invention be as follows:
1, the biasing circuit of well-designed power amplifier.
Power amplifier is most effective in rollback 7dB, so, adopt the pipe that how fit choice of technology power amplifier is single two-way.In the time that maximum power is worked, total power is 600W, in the time of rollback 7dB, can obtain power 120W.The biasing circuit of well-designed power amplifier, ensure that one of them pipe work is in AB class or category-B operating state, and the quiescent point of another pipe is chosen in C class operating state.In the time that main amplifier reaches capacity, booster amplifier is just started working, and like this, just can make power amplifier reach the highest efficiency.
2, well-designed match circuit.
Power amplifier is in the time of large signal operation, and transistorized optimum load impedance can change along with the increase of input signal power.This just need to, according to the well-designed all match circuits of these Changing Patterns, meanwhile, design the mixer of 90 ° and synthesize major-minor amplifier with the impedance transformer of 90 ° of skews, makes power amplifier reach optimum efficiency.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the how fit system of a kind of high-efficiency digital television transmitter of the present invention.
Reference numeral and translation:
RFin: radio frequency input;
PS: power divider;
MAIN: main amplifier;
AUX: booster amplifier;
QWTL: wavelength transmission line;
Load: load.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Referring to Fig. 1, the invention provides a kind of how fit system of high-efficiency digital television transmitter, the main circuit of how fit system will be inputted the components and parts such as RFin, power divider PS, main amplifier MAIN, booster amplifier AUX, wavelength transmission line QWTL and load Load and form by radio frequency.
The circuit of many fit systems connects as follows:
Radio frequency input RFin meets power divider PS, the power divider PS other end meets respectively main amplifier MAIN and booster amplifier AUX, another termination wavelength transmission line of main amplifier MAINS QWTL, the wavelength transmission line QWTL other end meets respectively booster amplifier AUX and load Load, and the booster amplifier AUX other end meets respectively wavelength transmission line QWTL and load Load.
How fit implementation method and the course of work of the system of high-efficiency digital television transmitter of the present invention be as follows:
Radio frequency input RFin signal is after power divider PS, and wherein main amplifier MAIN is delivered on a road, after main amplifier amplifies, delivers to quarter-wave transmission line QWTL; Booster amplifier AUX is delivered on radio frequency input RFin signal another road after power divider PS, delivers to quarter-wave transmission line QWTL, output after quarter-wave transmission line QWTL processes after amplifying.
The biasing circuit of the well-designed power amplifier of of the present invention how fit system, selects the pipe that power amplifier is single two-way, and in the time that maximum power is worked, total power is 600W, in the time of rollback 7dB, can obtain power 120W.In the biasing circuit of power amplifier, one of them pipe work is in AB class or category-B operating state, and the quiescent point of another pipe is chosen in C class operating state.In the time that main amplifier reaches capacity, booster amplifier is just started working, and like this, just can make power amplifier reach the highest efficiency.
The well-designed match circuit of of the present invention how fit system, designs the mixer of 90 ° and synthesizes major-minor amplifier with the impedance transformer of 90 ° of skews, makes power amplifier reach optimum efficiency.
In sum, adopt how fit system and the implementation method thereof of high-efficiency digital television transmitter of the present invention, high power amplifier is in the situation that meeting system linear requirement completely, efficiency is significantly promoted, can be by improved efficiency to 30%～35% of traditional high power digital television transmitter 10%～13%, greatly save the energy, reduced cost.Adopt the high-efficiency digital television transmitter product of the present invention how fit technology have complete machine efficiently, energy-saving and emission-reduction, the linearity is good, reliability is high, implementation method is simple, the advantage such as with low cost.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment is only for the present invention is described, and not as limitation of the invention, as long as within the scope of connotation of the present invention, variation, the modification etc. of above-described embodiment all will be dropped on to the scope of the claims in the present invention.
Claims (2)
1. a how fit system for high-efficiency digital television transmitter, is characterized in that: it comprises radio frequency input RFin, power divider PS, main amplifier MAIN, booster amplifier AUX, wavelength transmission line QWTL and load Load;
Wherein: radio frequency input RFin meets power divider PS, the power divider PS other end meets respectively main amplifier MAIN and booster amplifier AUX, another termination wavelength transmission line of main amplifier MAINS QWTL, the booster amplifier AUX other end meets respectively wavelength transmission line QWTL and load Load.
2. the implementation method of the how fit system of high-efficiency digital television transmitter according to claim 1, it is characterized in that: radio frequency input RFin signal is after power divider PS, wherein main amplifier MAIN is delivered on a road, after main amplifier amplifies, delivers to quarter-wave transmission line QWTL; Booster amplifier AUX is delivered on radio frequency input RFin signal another road after power divider PS, delivers to quarter-wave transmission line QWTL, output after quarter-wave transmission line QWTL processes after amplifying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410173626.2A CN103945149A (en) | 2014-04-28 | 2014-04-28 | Multiple-complex system of high efficiency digital television transmitter and implementing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410173626.2A CN103945149A (en) | 2014-04-28 | 2014-04-28 | Multiple-complex system of high efficiency digital television transmitter and implementing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054589A2 (en) * | 2000-12-29 | 2002-07-11 | Ericsson Inc. | Triple class e doherty amplifier topology for high efficiency signal transmitters |
| CN101164229A (en) * | 2003-10-21 | 2008-04-16 | 安华高科技无线Ip（新加坡）私人有限公司 | High linearity doherty communication amplifier with bias control |
| CN102158190A (en) * | 2011-04-29 | 2011-08-17 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method thereof |
| CN202268850U (en) * | 2011-10-20 | 2012-06-06 | 福州大学 | Doherty power amplifying circuit |
| CN203801014U (en) * | 2014-04-28 | 2014-08-27 | 上海东洲罗顿通信股份有限公司 | Doherty system for high-efficiency digital television transmitter |
-
2014
- 2014-04-28 CN CN201410173626.2A patent/CN103945149A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002054589A2 (en) * | 2000-12-29 | 2002-07-11 | Ericsson Inc. | Triple class e doherty amplifier topology for high efficiency signal transmitters |
| CN101164229A (en) * | 2003-10-21 | 2008-04-16 | 安华高科技无线Ip（新加坡）私人有限公司 | High linearity doherty communication amplifier with bias control |
| CN102158190A (en) * | 2011-04-29 | 2011-08-17 | 中兴通讯股份有限公司 | Doherty power amplifier and implementation method thereof |
| CN202268850U (en) * | 2011-10-20 | 2012-06-06 | 福州大学 | Doherty power amplifying circuit |
| CN203801014U (en) * | 2014-04-28 | 2014-08-27 | 上海东洲罗顿通信股份有限公司 | Doherty system for high-efficiency digital television transmitter |
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Application publication date: 20140723 |
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