CN202218320U - Digital television exciter - Google Patents
Digital television exciter Download PDFInfo
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- CN202218320U CN202218320U CN 201120298935 CN201120298935U CN202218320U CN 202218320 U CN202218320 U CN 202218320U CN 201120298935 CN201120298935 CN 201120298935 CN 201120298935 U CN201120298935 U CN 201120298935U CN 202218320 U CN202218320 U CN 202218320U
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Abstract
The utility model relates to a digital television exciter, which comprises a digital base band modulation unit, an analog modulation unit, a radio frequency non-linear correction unit, a power regulation amplifying unit, a frequency synthesis unit and a monitor unit. The digital base band modulation unit receives input signals and outputs coding modulation postamble of the input signals. The analog modulation unit receives the coding modulation postamble output by the digital base band modulation unit and outputs radio frequency signals of the coding modulation postamble signals. The radio frequency non-linear correction unit receives the radio frequency signals output by the analog modulation unit and output feedback signals of a transmitter and outputs radio frequency signals after conducting non-linear predistortion processing based on the output feedback signals. The power regulation amplifying unit receives the radio frequency signals output by the radio frequency non-linear correction unit and outputs radio frequency signals after processing of power regulation amplifying. The frequency synthesis unit provides work clock signals for the digital base band modulation unit and the analog modulation unit. The monitor unit transmits control information to each unit.
Description
Technical field
The utility model relates to a kind of DTV exciter, particularly relates to a kind of DTV exciter with the correction of radio frequency self-adaptation nonlinear.
Background technology
Along with the fast development of digital technology, ground system of digital television broadcast has become the main flow of television broadcasting system.For quality and the quantity that improves program transmission, and improve spectrum efficiency, adopt many level modulation mode in the DTV exciter usually, like 16QAM and 64QAM.In addition, multi-transceiver technology has caused signal envelope significantly to change, thereby has produced crosstalk, and consequent regeneration frequency spectrum will disturb adjacent channel.These have all proposed harsh requirement to the linearity of power amplifier, therefore how to improve the nonlinear distortion of power amplifier, are very important problems with the efficient that improves transmitter power amplifier.
At present; The DTV exciter adopts the method for base band predistortion to improve the nonlinear distortion of transmitter power amplifier usually; Its implementation comprises: the feedback signal of power amplifier is separated through down-conversion and A/D conversion be transferred to base band, afterwards, carry out corresponding pre-distortion.
The inventor finds in realizing the utility model process: since the base band predistortion Technology Need with the feedback signal of power amplifier through down-conversion and A/D conversion and separate and be transferred to base band, therefore, it realizes that specifically circuit is complicated, the realization cost is higher.
Because the defective that above-mentioned existing DTV exciter exists; The inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge; And cooperate the utilization of studying the science, actively study innovation, in the hope of founding a kind of DTV exciter of new structure; Can overcome the problem that existing DTV exciter exists, make it have more practicality.Through constantly research and design, and, found out the utility model of true tool practical value finally through after studying sample and improvement repeatedly.
The utility model content
The purpose of the utility model is, overcomes the defective that existing DTV exciter exists, and a kind of new DTV exciter is provided; Technical problem to be solved is; Simplify concrete realization circuit, thereby reduce the realization cost of DTV exciter, be very suitable for practicality.
The purpose of the utility model and solve its technical problem and can adopt following technical scheme to realize.
A kind of DTV exciter according to the utility model proposes comprises: the digital baseband modulating unit, receiving inputted signal and export the coded modulation of input signal after signal; The analog-modulated unit is connected with said digital baseband modulating unit, receives signal after the coded modulation of said digital baseband modulating unit output, and exports the radiofrequency signal of signal after this coded modulation; The radio frequency non-linear correction unit; Be connected with transmitter with said analog-modulated unit and be connected; Receive the radiofrequency signal of said analog-modulated unit output and the output feedback signal of said transmitter, output is carried out the radiofrequency signal after non-linear predistortion is handled based on this output feedback signal to said radiofrequency signal; The power adjustments amplifying unit is connected with said radio frequency non-linear correction unit, the radiofrequency signal of received RF non-linear correction unit output, and the radiofrequency signal after the power output adjusting processing and amplifying; The frequency synthesis unit is connected with the analog-modulated unit with said digital baseband modulating unit, and the local oscillation signal of work clock and working frequency range is provided to digital baseband modulating unit and analog-modulated unit; Monitoring unit all is connected with digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit, sends control information to said digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit.
The purpose of the utility model and solve its technical problem and can also adopt following technical measures to come further to realize.
Preferable, aforesaid DTV exciter, wherein the digital baseband modulating unit comprises: interface module, receive Asynchronous Serial Interface ASI signal, and output ASI signal through search synchronously, code check is adaptive and timer reference of programs PCR treatment for correcting after signal; The front end coding module is connected with interface module, the signal of receiving interface module output, and the signal after scrambling, forward error correction FEC coding, the time-domain symbol interleaving treatment is carried out in output to the received signal; The back-end code module is connected with said front end coding module, receives the signal of said front end coding module output, and exports the digital I and the Q baseband signal of its signal that receives.
Preferable, aforesaid DTV exciter, wherein said analog-modulated unit comprises: D/A conversion chip, receive said digital I and Q baseband signal, and output Simulation with I and Q baseband signal; Modulation module is connected with said D/A conversion chip, receives Simulation with I and Q baseband signal, and the radiofrequency signal of output Simulation with I and Q baseband signal; Amplification module is connected with said modulation module in advance, receives said radiofrequency signal, and the radiofrequency signal after the output processing and amplifying.
Preferable, aforesaid DTV exciter, wherein the radio frequency non-linear correction unit comprises: first coupler receives the signal of analog-modulated unit output, and offers Postponement module and predistortion processing circuit respectively; Postponement module receives the signal that said first coupler is exported, and the signal after the second coupler output delay is handled; Second coupler, the signal of receive delay module and predistortion processing circuit output, and output; Adjustable attenuator, the output feedback signal of receiver/transmitter, and the signal after the output attenuatoin processing; Predistortion processing circuit receives the signal that said first coupler and adjustable attenuator are exported, and output is based on the signal that from the signal of said adjustable attenuator output, extracts after the signal of power amplifier information to said first coupler output carries out pre-distortion.
Preferable; Aforesaid DTV exciter; Wherein said radio frequency non-linear correction unit also comprises: first control module; All be connected with said adjustable attenuator, predistortion processing circuit and monitoring unit, receive the control information of said monitoring unit output, and to said adjustable attenuator output attenuatoin control command and/or to said predistortion processing circuit output pre-distortion control command.
Preferable, aforesaid DTV exciter, wherein said Postponement module comprises: delay line.
Preferable, aforesaid DTV exciter, wherein the power adjustments amplifying unit comprises: pre-amplification circuit.
Preferable, aforesaid DTV exciter, wherein said frequency synthesis unit comprises: frequency module, the local oscillation signal of output services clock and working frequency range; The 3rd coupler is connected with said frequency module, and the local oscillation signal of the working frequency range of said frequency module output is offered analog-modulated unit and the device that is used for the local oscillator test; The frequency division shunt module is connected with said frequency module, and the work clock that said frequency module is exported offers digital baseband modulating unit and the device that is used for reference to test.
Preferable, aforesaid DTV exciter, wherein said frequency synthesis unit also comprises: comparator, be connected with said frequency module, receive external signal, and export the signal that forms by said external signal with predetermined level to said frequency module; And/or second control module is connected with said frequency module, receives the control information of said monitoring unit output, and to said frequency module output frequency control command.
Preferable, aforesaid DTV exciter, wherein said monitoring unit is connected with said digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit through the I2C bus.
By technique scheme; The DTV exciter of the utility model has advantage and beneficial effect at least: the utility model is through being provided with the radio frequency non-linear correction unit; Make the DTV exciter carry out pre-distortion, like this, avoided the feedback signal of transmitter power amplifier is passed through down-conversion and A/D conversion and separated the processing procedure of being transferred to base band in radio frequency domains; Thereby simplified the circuit design of DTV exciter, reduced the realization cost of DTV exciter.
In sum, the utility model is realizing technical obvious improvement being arranged, and has tangible good effect, really is a novelty, progress, practical new design.
Above-mentioned explanation only is the general introduction of the utility model technical scheme; In order more to know the technological means of understanding the utility model; And can implement according to the content of specification, and for let the above-mentioned of the utility model with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the DTV exciter sketch map of the utility model;
Fig. 2 is the digital baseband modulating unit sketch map of the utility model;
Fig. 3 is the analog-modulated cell schematics of the utility model;
Fig. 4 is the radio frequency non-linear correction unit sketch map of the utility model;
Fig. 5 is the frequency synthesis cell schematics of the utility model.
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined utility model purpose is taked; Below in conjunction with accompanying drawing and preferred embodiment; To its embodiment of DTV exciter, structure, characteristic and the effect that proposes according to the utility model, specify as after.
The structure of the DTV exciter of the utility model is shown in accompanying drawing 1.DTV exciter shown in Fig. 1 comprises: digital baseband modulating unit 1, analog-modulated unit 2, radio frequency non-linear correction unit 3, power adjustments amplifying unit 4, frequency synthesis unit 5 and monitoring unit 6.
Digital baseband modulating unit 1 is connected with analog-modulated unit 2, frequency synthesis unit 5 and monitoring unit 6.Digital baseband modulating unit 1 is mainly used in the input signal (like the ASI signal) that receiving digital television exciter external transmission is come, and this input signal is carried out coded modulation handle, afterwards, and the signal after it is handled to 2 outputs of analog-modulated unit.A concrete example, the ASI signal that digital baseband modulating unit 1 comes external transmission carries out coded modulation according to the requirement of GB20600-2006 regulation and handles and export.The work clock of digital baseband modulating unit 1 is that frequency synthesis unit 5 is its work clock signal that provides.In addition, digital baseband modulating unit 1 can also be carried out corresponding operation according to the control signal that monitoring unit 6 transmission come.
Analog-modulated unit 2 is connected with digital baseband modulating unit 1, radio frequency non-linear correction unit 3, frequency synthesis unit 5 and monitoring unit 6.Analog-modulated unit 2 is mainly used in signal after the coded modulation that receives 1 output of digital baseband modulating unit; And signal after this coded modulation carried out the modulation treatment of rf frequency; To produce corresponding radiofrequency signal, afterwards, analog-modulated unit 2 is to radio frequency non-linear correction unit 3 these radiofrequency signals of output; That is to say that the signal after the 2 pairs of coded modulation in analog-modulated unit carries out upconverting to radio frequency and output after the D/A conversion.The work clock of analog-modulated unit 2 is work clock signals that frequency synthesis unit 5 provides.In addition, corresponding operation can also be carried out according to the control signal that monitoring unit 6 transmission come in analog-modulated unit 2.
Radio frequency non-linear correction unit 3 is connected with analog-modulated unit 2, power adjustments amplifying unit 4, monitoring unit 6 and transmitter.Radio frequency non-linear correction unit 3 is mainly used in the radiofrequency signal that receives 2 outputs of analog-modulated unit; And the output feedback signal of receiver/transmitter; Radio frequency non-linear correction unit 3 output feedback signal that transmission comes based on the transmitter radiofrequency signal that 2 transmission come to the analog-modulated unit is carried out the non-linear predistortion processing, and the radiofrequency signal after power adjustments amplifying unit 4 provides pre-distortion.That is to say that radio frequency non-linear correction unit 3 is extracted the radiofrequency signal of distortion from power amplifier is coupled the signal of returning, and carry out non-linear predistortion based on this radiofrequency signal and handle.The output feedback signal of above-mentioned transmitter also can be called feedback input signal for radio frequency non-linear correction unit 3.In addition, radio frequency non-linear correction unit 3 can also be carried out corresponding operation according to the control signal that monitoring unit 6 transmission come.
Power adjustments amplifying unit 4 is connected with monitoring unit 6 with radio frequency non-linear correction unit 3.Power adjustments amplifying unit 4 is mainly used in the radiofrequency signal after the process pre-distortion of received RF non-linear correction unit 3 output; And this radiofrequency signal carried out the power adjustments processing and amplifying; Afterwards, the radiofrequency signal of power adjustments amplifying unit 4 after the outer member of DTV exciter provides the power adjustments processing and amplifying.A concrete example, power adjustments amplifying unit 4 is amplified in the 0-10dBm power bracket radiofrequency signal that receives and output with the adjustable mode of 0.1dB stepping.
Above-mentioned power adjustments amplifying unit 4 can be specially pre-amplification circuit; This pre-amplification circuit can adopt the harmonic wave suppressor mode of switch switching at IV wave band and V-band; And this pre-amplification circuit can adopt AGC (Automatic Gain Control, the automatic gain control) mode of numeral and simulation.In power control,, thereby the numeral adjustment and the digital compensation of power output have been realized because power adjustments amplifying unit 4 has adopted Digital Signal Processing to realize digital automatic horizontal (DALC) control of RF signal gain.
In addition, power adjustments amplifying unit 4 can also be carried out corresponding operation according to the control signal that monitoring unit 6 transmission come.
Above-mentioned monitoring unit 6 can adopt embedded OS, and like this, monitoring unit 6 has multithreading, is prone to characteristics such as expansion, stable height.
Digital baseband modulating unit 1 in the foregoing description, analog-modulated unit 2, radio frequency non-linear correction unit 3, power adjustments amplifying unit 4, frequency synthesis unit 5 and monitoring unit 6 can be the assembly of elements that meets the GB20600-2006 regulation; Thereby the DTV exciter of the utility model can be accomplished (the Transport Stream from base band TS; MPTS) input data bitstream flows to the conversion of UHF (Very High Frequency, very high frequency(VHF)) the frequency range received terrestrial digital broadcasting radiofrequency signal that meets the GB20600-2006 regulation.In addition; Since the DTV exciter that the utility model proposes can according to the output feedback signal of transmitter real-time carry out gamma correction in radio frequency domains; Therefore, the DTV exciter of the utility model also can be called the DTV exciter of radio frequency adaptively correcting.
Can know from foregoing description; Adopted OFDM (Orthogonal Frequency Division Multiplexing at digital baseband modulating unit 1; OFDM) under the situation of multi-carrier modulation technology; Transmitter output signal has very high peak-to-average force ratio, and the dynamic range of signal is very big in other words, therefore, the dynamic range and the linearity of the signal processing unit of system rear end has all been proposed very high requirement.In the circuit of reality is realized; Processing such as signal modulation, frequency conversion and power amplification all have only limited dynamic range; And all nonlinear distortion can be arranged; Especially the power amplifier of final stage (comprising solid-state power amplifier SSPA, travelling-wave tube amplifier TWTA etc.) is owing to the restriction that receives factors such as power amplification components and parts technological level, power-efficient, rack volume, weight and manufacturing cost, non-linear more serious.Behind gamma correction through the radio frequency non-linear correction unit 3 in the DTV exciter; RF power amplification can be under identical quality of output signals index; Export bigger power or use littler power amplifier can obtain needed power output, perhaps under the constant situation of all the other conditions, effectively improve the output quality of signals.Simultaneously, can also improve the power supply service efficiency of power amplifier, reduce power supply power consumption, reduce heat radiation, thereby reduce the maintenance difficulties and the workload of equipment, improve the reliability of system.
In addition; Radio frequency non-linear correction unit 3 is through extracting the nonlinear characteristic that the signal that comes via the power amplifier coupling obtains power amplifier; According to the amplifier nonlinearity characteristic radiofrequency signal undistorted or that distortion is very little of input is carried out pre-distortion; Compensate the nonlinear amplitude distortion and the phase distortion that RF power amplification produced of rear end, thereby effectively improve the linearity of RF power amplification.
Below in conjunction with accompanying drawing 2-5 the concrete structure of each unit shown in Fig. 1 is explained one by one.
Digital baseband modulating unit 1 shown in Fig. 2 mainly comprises: interface module 11, front end coding 12 and back-end code 13.Interface module 11 is connected with the outer member of DTV exciter; Front end coding module 12 is connected respectively with back-end code module 13 with interface module 11; Back-end code module 13 is connected with analog-modulated unit 2, and interface module 11, front end coding module 12 and back-end code module 13 are connected respectively with monitoring unit 6.
Interface module 11 is used for ASI (the Asynchronous Serial Interface of the outside input of receiving digital television exciter; Asynchronous Serial Interface) signal; And to the ASI signal that receives search synchronously, code check is adaptive and processing such as timer reference of programs PCR correction; Afterwards, the signal after 12 outputs of interface module 11 forward end coding modules are handled.Monitoring unit 6 can provide interface module 11 to carry out the required running parameter of above-mentioned processing to interface module 11.
Front end coding module 12 is mainly used in the signal of receiving interface module 11 outputs; And its signal that receives carried out scrambling, FEC (Forward Error Correction; Forward error correction) coding and time-domain symbol processing such as interweave; Afterwards, the signal after front end coding module 12 coding module 13 outputs are to the back-end handled.Monitoring unit 6 can provide front end coding module 12 to carry out the required running parameter of above-mentioned processing by forward end coding module 12.
Back-end code module 13 is mainly used in the signal of receiving front-end coding module 12 outputs; And its signal that receives carried out QAM (Quadrature Amplitude Modulation; Quadrature amplitude modulation) mapping, system information insertion, frequency-domain-interleaving, 3780 IFFT (Inverse Fast Fourier Transformation; Fast Fourier Transform Inverse), processing such as single multicarrier selection, peak-to-average force ratio and shaping filter; Thereby generate digital I and Q baseband signal, and the signal after 2 outputs of analog-modulated unit are handled, like 14 I of numeral and the Q baseband signal that generates to 2 outputs of analog-modulated unit.Monitoring unit 6 coding module 13 to the back-end provides back-end code module 13 to carry out the required running parameter of above-mentioned processing.
Can know by foregoing description; Digital baseband modulating unit 1 can adopt the code stream code check adjustment scheme based on FPGA; And can adopt dynamic code stream treatment technology; Thereby can realize the real-time processing of various code check code streams under the different bandwidth, and under the control of monitoring unit 6, can realize the spectral bandwidth of regulating last digital baseband signal through the system works clock of regulating digital baseband.
Analog-modulated unit 2 shown in Fig. 3 mainly comprises: D/A conversion chip 21, modulation module 22 and preparatory amplification module 23.D/A conversion chip 21 is connected with digital baseband modulating unit 1 (like back-end code 13); Modulation module 22 is connected respectively with preparatory amplification module 23 with D/A conversion chip 21; Amplification module 23 is connected with radio frequency non-linear correction unit 3 in advance, and modulation module 22 is connected with monitoring unit 6.
D/A conversion chip 21 is mainly used in digital I and the Q baseband signal that receives 13 outputs of back-end code module, and offers modulation module 22 after being converted into Simulation with I and Q baseband signal.Above-mentioned D/A conversion chip 21 can be the D/A conversion chip of 14b it with binary channel.D/A conversion chip with 14bit of binary channel can guarantee that the bias level of two-way simulation output is consistent, and then can reduce the level of carrier leak signal.
Modulation module 22 is mainly used in Simulation with I and the Q baseband signal that receives 21 outputs of D/A conversion chip; And this Simulation with I and Q baseband signal are carried out quadrature up-conversion handle; So that Simulation with I and Q baseband signal are converted directly to required rf frequency; Afterwards, the radiofrequency signal of modulation module 22 after preparatory amplification module 23 outputs are handled.The running parameter that monitoring unit 6 can provide modulation module 22 to carry out above-mentioned processing to modulation module 22.
Amplification module 23 is mainly used in the radiofrequency signal that receives modulation module 22 outputs in advance, and the radiofrequency signal that receives is carried out processing and amplifying, afterwards, and the radiofrequency signal of preparatory amplification module 23 after radio frequency non-linear correction unit 3 output processing and amplifying.A concrete example, amplification module 23 can be amplified to radiofrequency signal 0dBm and offer the radio frequency non-linear correction unit in advance.
Radio frequency non-linear correction unit 3 shown in Fig. 4 mainly comprises: coupler 31 (i.e. first coupler), delay line 32 (being a kind of concrete implementation of Postponement module), coupler 33 (i.e. second coupler), adjustable attenuator 34, predistortion processing circuit 35 and control 36 (i.e. first control modules).
Predistortion processing circuit 35 is mainly used in the signal that receives coupler 31 and adjustable attenuator 34 outputs; And from the radiofrequency signal that adjustable attenuator 34 is exported, extract power amplifier information; Afterwards; Predistortion processing circuit 35 carries out pre-distortion (being gamma correction) based on this power amplifier information radiofrequency signal that 31 transmission come to coupler, and the signal after coupler 32 output pre-distortion.
Frequency division and along separate routes 54 be mainly used in the clock signal (like the clock signal of 40MHz) that 52 transmission of S470M890MA chip are come and be divided into two-way and export to digital baseband modulating unit 1 and the device that is used for reference to test (with reference to monitoring) respectively.
The above only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction; Though the utility model discloses as above with preferred embodiment; Yet, be not that any professional and technical personnel of being familiar with is not in breaking away from the utility model technical scheme scope in order to qualification the utility model; When the technology contents of above-mentioned announcement capable of using is made a little change or is modified to the equivalent embodiment of equivalent variations; In every case be the content that does not break away from the utility model technical scheme, to any simple modification, equivalent variations and modification that above embodiment did, still belong in the scope of the utility model technical scheme according to the technical spirit of the utility model.
Claims (10)
1. a DTV exciter is characterized in that, comprising:
The digital baseband modulating unit, receiving inputted signal, and export signal after the coded modulation of this input signal;
The analog-modulated unit is connected with said digital baseband modulating unit, receives signal after the coded modulation of said digital baseband modulating unit output, and exports the radiofrequency signal of signal after this coded modulation;
The radio frequency non-linear correction unit; Be connected with transmitter with said analog-modulated unit and be connected; Receive the radiofrequency signal of said analog-modulated unit output and the output feedback signal of said transmitter, output is carried out the radiofrequency signal after non-linear predistortion is handled based on this output feedback signal to said radiofrequency signal;
The power adjustments amplifying unit is connected with said radio frequency non-linear correction unit, receives the radiofrequency signal of said radio frequency non-linear correction unit output, and the radiofrequency signal after the power output adjusting processing and amplifying;
The frequency synthesis unit is connected with the analog-modulated unit with said digital baseband modulating unit, and the local oscillation signal of work clock and working frequency range is provided to digital baseband modulating unit and analog-modulated unit;
Monitoring unit; All be connected with digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit, send control information to said digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit.
2. DTV exciter as claimed in claim 1 is characterized in that, said digital baseband modulating unit comprises:
Interface module receives Asynchronous Serial Interface ASI signal, and export said ASI signal through search synchronously, code check is adaptive and timer reference of programs PCR treatment for correcting after signal;
The front end coding module is connected with said interface module, the signal of receiving interface module output, and the signal after scrambling, forward error correction FEC coding, the time-domain symbol interleaving treatment is carried out in output to the received signal;
The back-end code module is connected with said front end coding module, receives the signal of said front end coding module output, and exports the digital I and the Q baseband signal of its signal that receives.
3. DTV exciter as claimed in claim 2 is characterized in that, said analog-modulated unit comprises:
D/A conversion chip receives said digital I and Q baseband signal, and output Simulation with I and Q baseband signal;
Modulation module is connected with said D/A conversion chip, receives Simulation with I and Q baseband signal, and the radiofrequency signal of output Simulation with I and Q baseband signal;
Amplification module is connected with said modulation module in advance, receives said radiofrequency signal, and the radiofrequency signal after the output processing and amplifying.
4. DTV exciter as claimed in claim 1 is characterized in that, said radio frequency non-linear correction unit comprises:
First coupler receives the signal of analog-modulated unit output, and offers Postponement module and predistortion processing circuit respectively;
Postponement module receives the signal that said first coupler is exported, and the signal after the second coupler output delay is handled;
Second coupler, the signal of receive delay module and predistortion processing circuit output, and output;
Adjustable attenuator, the output feedback signal of receiver/transmitter, and the signal after the output attenuatoin processing;
Predistortion processing circuit receives the signal that said first coupler and adjustable attenuator are exported, and output is based on the signal that from the signal of said adjustable attenuator output, extracts after the signal of power amplifier information to said first coupler output carries out pre-distortion.
5. DTV exciter as claimed in claim 4 is characterized in that, said radio frequency non-linear correction unit also comprises:
First control module; All be connected with said adjustable attenuator, predistortion processing circuit and monitoring unit; Receive the control information of said monitoring unit output, and to said adjustable attenuator output attenuatoin control command and/or to said predistortion processing circuit output pre-distortion control command.
6. DTV exciter as claimed in claim 4 is characterized in that said Postponement module comprises: delay line.
7. DTV exciter as claimed in claim 1 is characterized in that, said power adjustments amplifying unit comprises: pre-amplification circuit.
8. DTV exciter as claimed in claim 1 is characterized in that, said frequency synthesis unit comprises:
Frequency module, the local oscillation signal of output services clock and working frequency range;
The 3rd coupler is connected with said frequency module, and the local oscillation signal of the working frequency range of said frequency module output is offered analog-modulated unit and the device that is used for the local oscillator test;
The frequency division shunt module is connected with said frequency module, and the work clock that said frequency module is exported offers digital baseband modulating unit and the device that is used for reference to test.
9. DTV exciter as claimed in claim 8 is characterized in that, said frequency synthesis unit also comprises:
Comparator is connected with said frequency module, receives external signal, and exports the signal with predetermined level that is formed by said external signal to said frequency module; And/or
Second control module is connected with said frequency module, receives the control information of said monitoring unit output, and to said frequency module output frequency control command.
10. like the described DTV exciter of arbitrary claim in the claim 1 to 9; It is characterized in that said monitoring unit is connected with said digital baseband modulating unit, analog-modulated unit, radio frequency non-linear correction unit, power adjustments amplifying unit and frequency synthesis unit through the I2C bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120298935 CN202218320U (en) | 2011-08-17 | 2011-08-17 | Digital television exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120298935 CN202218320U (en) | 2011-08-17 | 2011-08-17 | Digital television exciter |
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| CN202218320U true CN202218320U (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120298935 Expired - Lifetime CN202218320U (en) | 2011-08-17 | 2011-08-17 | Digital television exciter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580954A (en) * | 2013-10-18 | 2015-04-29 | 北京同方吉兆科技有限公司 | Full digital domain broadcast television exciter |
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2011
- 2011-08-17 CN CN 201120298935 patent/CN202218320U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104580954A (en) * | 2013-10-18 | 2015-04-29 | 北京同方吉兆科技有限公司 | Full digital domain broadcast television exciter |
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