CN201830349U - Radio-frequency implementation circuit of transmitter exciter of digital television - Google Patents
Radio-frequency implementation circuit of transmitter exciter of digital television Download PDFInfo
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- CN201830349U CN201830349U CN2010205299445U CN201020529944U CN201830349U CN 201830349 U CN201830349 U CN 201830349U CN 2010205299445 U CN2010205299445 U CN 2010205299445U CN 201020529944 U CN201020529944 U CN 201020529944U CN 201830349 U CN201830349 U CN 201830349U
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Abstract
The utility model provides a radio-frequency implementation circuit of a transmitter exciter of a digital television, which comprises a CPU (central processing unit) monitoring unit, a signal conversion and processing unit, a nonlinear distortion signal acquisition unit and four local oscillation signal generators. The CPU monitoring unit is respectively connected with the local oscillation signal generators and an external interface; the signal conversion and processing unit comprises an ATT (automatic test terminal), a first frequency conversion module, a second frequency conversion module and a third frequency conversion module connected in sequence, and is connected with a first local oscillation signal generator, a second local oscillation signal generator and a third local oscillation signal generation module; and the nonlinear distortion signal acquisition unit and the signal conversion and processing unit share variable frequency local oscillation signals. The radio-frequency implementation circuit can output various carrier signals within the whole range of the digital television, can output signals with small step and good phase noise, and can feedback nonlinear distortion generated by a transmitter.
Description
[technical field]
The utility model relates to a kind of digital TV transmitter exciter, and particularly a kind of digital TV transmitter exciter radio frequency is realized circuit.
[background technology]
Along with the development of China's Digital Television, digital television signal network perfect step by step for better, covers the signal of Digital Television more comprehensively, and increasing digital TV transmitter comes into operation.As an indispensable major part of digital TV transmitter, the digital TV transmitter exciter is finished the conversion from input data bitstream stream signal to terrestrial television Channel Transmission signal.The digital TV transmitter exciter should have that stability is good, frequency spectrum is pure, phase noise is low, characteristics such as phase modulation precision height, but there are shortcomings such as phase noise is relatively poor in the design of existing digital TV transmitter exciter.
[utility model content]
The technical problems to be solved in the utility model, be to provide a kind of digital TV transmitter exciter radio frequency to realize circuit, it can be exported each carrier signal, the little stepping of output signal in the integer word TV band, make an uproar mutually, and the nonlinear distortion of feedback transmitter generation.
The utility model is achieved in that
A kind of digital TV transmitter exciter of the utility model radiofrequency signal realizes circuit, it comprises: a cpu monitor unit, one signal conversion processes unit, one nonlinear distortion signal gathering unit, the first local oscillation signal generator, the second local oscillation signal generator, the 3rd local oscillation signal generation module, the 4th local oscillation signal generator, the 6th frequency converter;
Described cpu monitor unit respectively with the first local oscillation signal generator, the second local oscillation signal generator, the 3rd local oscillation signal generation module, the 4th local oscillation signal generator and an external interface connect;
Described signal conversion processes unit comprises, connect successively: a numerical control ATT, one moves first frequency-variable module of high-frequency intermediate-freuqncy signal with the intermediate-freuqncy signal that receives, one moves second frequency-variable module of radiofrequency signal with described high-frequency intermediate-freuqncy signal, one moves the 3rd frequency-variable module of Digital Television radiofrequency signal with described radiofrequency signal, described first frequency-variable module connects the first local oscillation signal generator, second frequency-variable module connects the second local oscillation signal generator, and the 3rd frequency-variable module connects the 3rd local oscillation signal generation module;
Described nonlinear distortion signal gathering unit connects the 6th frequency converter that the 3rd local oscillation signal generation module and receives the local oscillation signal of described first local oscillation signal generator and the 4th local oscillation signal generator respectively.
Further, the described first local oscillation signal generator comprises the PLL that connects successively, 2 frequency dividers, the LC filter, the DDS signal generating circuit, the LC filter, described PLL, DDS signal generating circuit are connected with described cpu monitor unit respectively, and described LC filter is connected with the 6th frequency converter with first frequency-variable module respectively.
Further, described the 3rd local oscillation signal generation module comprises two the 3rd local oscillation signal generators, with a switching switch, wherein an end of one the 3rd local oscillation signal generator is connected with the cpu monitor unit, the other end is connected with described diverter switch, another the 3rd local oscillation signal generator one end is connected with the cpu monitor unit, and the other end is connected with described diverter switch, and described diverter switch also is connected with the nonlinear distortion signal gathering unit with the 3rd frequency-variable module of signal conversion processes unit.
Further, first frequency-variable module of described signal conversion processes unit comprises, connects successively: one the one LC filter, one first frequency converter, one the 2nd LC filter, one the one IF amplifier.
Further, second frequency-variable module of described signal conversion processes unit comprises, connects successively: one second frequency converter, the high squareness factor dielectric filter of one the one RF, one the one RF amplifier.
Further, the 3rd frequency-variable module of described signal conversion processes unit comprises, connects successively: one the 3rd frequency converter, one the one LC low pass filter, one the 2nd IF amplifier, one the 2nd LC low pass filter.
Further, described first frequency converter connects the first local oscillation signal generator, and second frequency converter connects the second local oscillation signal generator, and the 3rd frequency converter connects the 3rd local oscillation signal generation module.
Further, described nonlinear distortion signal gathering unit comprises connection successively: one second numerical control ATT, one the 3rd LC low pass filter, one the 4th frequency converter, one the 4th LC low pass filter, one the 3rd RF amplifier, the high squareness factor dielectric filter of one the 2nd RF, one the 5th frequency converter, one the 3rd LC filter, one the 2nd IF amplifier, one the 4th LC filter; Described the 4th frequency converter connects the 3rd local oscillation signal generation module, and the 5th frequency converter connects the 6th frequency converter of the local oscillation signal of described first a local oscillation signal generator of reception and the 4th local oscillation signal generator.
Further, a described LC low pass filter, the 2nd LC low pass filter, the 3rd LC low pass filter, the 4th LC low pass filter are the filter that comprises whole digital television signal frequency range.
Advantage of the present utility model is:
1, the utility model can be moved any one carrier wave in the Digital Television radiofrequency signal band with the single carrier intermediate-freuqncy signal of digital TV transmitter exciter modulator output through three frequency conversions of signal conversion processes unit; Use the DDS technology, the phase-locked local oscillation signal that obtains can not worsen phase noise, thereby can obtain that frequency is accurate, the output of the radiofrequency signal of little stepping;
2, the frequency conversion local oscillation signal of signal conversion processes unit of the present utility model and nonlinear distortion signal gathering unit is shared, and there is not deviation in frequency, so that carry out non-linear pre-correction more accurately;
3, the described Digital Television exciter of the utility model circuit is contained whole Digital Television frequency range, non-linear pre-correction with feedback signal as proofreading and correct foundation, so it can be widely used in the middle of the digital TV transmitter of each place, each model power amplifier.
[description of drawings]
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 is the operation principle block diagram that the utility model digital TV transmitter exciter radio frequency is realized circuit;
Fig. 2 produces the operation principle block diagram of local oscillation signal for the utility model DDS.
[embodiment]
In conjunction with Fig. 1 and Fig. 2, embodiment of the present utility model is described in detail.
As shown in Figure 1, a kind of digital TV transmitter exciter radiofrequency signal realizes circuit, it comprises a cpu monitor unit 3, one signal conversion processes unit 1, one nonlinear distortion signal gathering unit, 2, the first local oscillation signal generators, 4, the second local oscillation signal generators 5, the 3rd local oscillation signal generation module 6, the four local oscillation signal generators 7.
Described cpu monitor unit 3 respectively with the first local oscillation signal generator 4, the second local oscillation signal generator 5, the 3rd local oscillation signal generation module 6, the 4th a local oscillation signal generator 7 and an external interface connect, described external interface is a RS486 serial ports 9, the local oscillation signal frequency of described cpu monitor unit 3 each road local oscillation signal generator of control, and by external interface and telex network, the output of different frequency range radiofrequency signal in the Digital Television band that the user need can select according to demand, the user can directly be provided with required frequency and power output.
Described signal conversion processes unit 1 comprises, connects successively: one first numerical control ATT101, one the one LC filter 102, one first frequency converter 103, one the 2nd LC filter 104, an IF amplifier, 105, one second frequency converters 106, the high squareness factor dielectric filter 107 of one the one RF, one the one RF amplifier 108, the 3rd frequency converter 109, a LC low pass filter 110, one the 2nd IF amplifier 111, the 2nd LC low pass filter 112.Described first frequency converter 103 connects the first local oscillation signal generator, 4, the second frequency converters 106 and connects the second local oscillation signal generator, 5, the three frequency converters, 109 connections the 3rd local oscillation signal generation module 6.Described signal conversion processes unit 1 receives through the intermediate-freuqncy signal after FPGA and the D/A modulation, through a series of frequency spectrum shifts, and output Digital Television radiofrequency signal.
The described first numerical control ATT101 adjusts as the AGC function, is responsible for pinning the output power value that the user is provided with, and guarantees output power levels unanimity in the whole band of Digital Television output signal.The first local oscillation signal generator 4 adopts the DDS technology, and as shown in Figure 2, it comprises the PLL that connects successively, frequency divider, and the LC filter, the DDS signal generating circuit, LC filter, described PLL, DDS signal generating circuit are connected with described cpu monitor unit respectively.With one group of 10MHZ as the reference clock, produce a fixedly frequency signal by described PLL, obtain making an uproar mutually preferably by this signal frequency split, the clock signal that meets DDS reference clock signal frequency, described clock signal is delivered to the DDS signal generating circuit through after the filtering, by cpu monitor unit 3 it is controlled, made an uproar the local oscillation signal of little stepping mutually.After described first frequency converter 103 receives this local oscillation signal, the intermediate-freuqncy signal that is received is moved the intermediate-freuqncy signal of a upper frequency.Described second frequency converter 106 receives from one of the second local oscillation signal generator 5 fixing local oscillation signal preferably of making an uproar mutually, intermediate-freuqncy signal is moved the radiofrequency signal of a upper frequency.The one RF is high, and squareness factor dielectric filter 107 is responsible for filtering second local oscillation signal and harmonic wave.The 3rd local oscillation signal generation module 6 comprises A local oscillation signal generator 61, B local oscillation signal generator 62 and one switches switch 63, described A local oscillation signal generator 61 is connected with cpu monitor unit 3 respectively with B local oscillation signal generator 62 1 ends, be subjected to the control of cpu monitor unit 3, the other end is connected with described diverter switch 63, and described diverter switch 63 is connected with the 3rd frequency converter 109.Control the signal output of the signal or the B local oscillation signal generator 62 of A local oscillation signal generator 61 by diverter switch 63.The 3rd frequency converter 109 is moved the Digital Television radiofrequency signal by the local oscillation signal that receives with radiofrequency signal, realizes whole band and the big stepping frequency point setting of 200KHZ.A described LC low pass filter 110, the two LC low pass filters 112 have all comprised whole digital signal frequency range.Through a described LC low pass filter 110, export radio frequency amplifier 111, the two LC low pass filters 112 backs through the radiofrequency signal after moving for the third time.
Nonlinear distortion signal gathering unit 2 comprises, connect successively: one second numerical control ATT201, one the 3rd LC low pass filter 202, the 4th frequency converter 203, the 4th LC low pass filter 204, one the 3rd RF amplifier 205, high squareness factor dielectric filter 206, the 5th frequency converter 207, of one the 2nd RF the 3rd LC filter 208, one the 2nd IF amplifier 209, the 4th LC filter 210.Described the 4th frequency converter 203 connects the 6th frequency converter 8 that the 3rd local oscillation signal generation module 6, the five frequency converters 207 connect the local oscillation signal of described first a local oscillation signal generator 4 of reception and the 4th local oscillation signal generator 7.The described second numerical control ATT201 adjusts as the AGC function, is responsible for pinning the output power value that the user is provided with.The nonlinear properties that the nonlinear distortion signal gathering unit is collected enter from ATT.Described the 3rd LC low pass filter 202, the four LC low pass filters 204 have comprised whole digital signal frequency range.The local oscillation signal of high squareness factor dielectric filter 206 filtering harmonic waves of described the 2nd RF and the 4th frequency conversion.Described the 5th frequency conversion is responsible for radiofrequency signal is converted to intermediate-freuqncy signal.The local oscillation signal of the 5th frequency converter 207 is provided by the 6th frequency converter 8.Described the 6th frequency converter 8 is responsible for will be from the signal mixing of the first local oscillation signal generator 4 and the 4th local oscillation signal generator 7.Described intermediate-freuqncy signal through the 5th frequency conversion is exported through the 3rd LC filter 208, the two IF amplifiers 209, the four LC filters 210 backs.The intermediate-freuqncy signal frequency of the intermediate-freuqncy signal frequency of described output and 1 input of signal conversion processes unit is inconsistent.Described intermediate-freuqncy signal through 2 outputs of nonlinear distortion signal gathering unit feeds back to FPGA and carries out the precorrection processing.The frequency conversion local oscillation signal of signal conversion processes of the present utility model unit 1 and nonlinear distortion signal gathering unit 2 is shared, and there is not deviation in frequency, so that carry out non-linear pre-correction more accurately.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented according to this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.
Claims (10)
1. a digital TV transmitter exciter radiofrequency signal realizes circuit, it is characterized in that, it comprises: a cpu monitor unit, one signal conversion processes unit, a nonlinear distortion signal gathering unit, the first local oscillation signal generator, the second local oscillation signal generator, the 3rd local oscillation signal generation module, the 4th local oscillation signal generator, the 6th frequency converter;
Described cpu monitor unit respectively with the first local oscillation signal generator, the second local oscillation signal generator, the 3rd local oscillation signal generation module, the 4th local oscillation signal generator and an external interface connect;
Described signal conversion processes unit comprises connection successively: one first numerical control ATT, one moves first frequency-variable module of high-frequency intermediate-freuqncy signal with the intermediate-freuqncy signal that receives, one moves second frequency-variable module of radiofrequency signal with described high-frequency intermediate-freuqncy signal, and one moves the 3rd frequency-variable module of Digital Television radiofrequency signal with described radiofrequency signal; And described first frequency-variable module connects the first local oscillation signal generator, and second frequency-variable module connects the second local oscillation signal generator, and the 3rd frequency-variable module connects the 3rd local oscillation signal generation module;
Described nonlinear distortion signal gathering unit connects the 6th frequency converter that the 3rd local oscillation signal generation module and receives the local oscillation signal of described first local oscillation signal generator and the 4th local oscillation signal generator respectively.
2. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: the described first local oscillation signal generator comprises the PLL that connects successively, 2 frequency dividers, the LC filter, the DDS signal generating circuit, the LC filter, described PLL, DDS signal generating circuit are connected with described cpu monitor unit respectively, and described LC filter is connected with the 6th frequency converter with first frequency-variable module respectively.
3. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: described the 3rd local oscillation signal generation module comprises two the 3rd local oscillation signal generators, with a switching switch, wherein an end of one the 3rd local oscillation signal generator is connected with the cpu monitor unit, the other end is connected with described diverter switch, another the 3rd local oscillation signal generator one end is connected with the cpu monitor unit, the other end is connected with described diverter switch, and described diverter switch also is connected with the nonlinear distortion signal gathering unit with the 3rd frequency-variable module of signal conversion processes unit.
4. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: first frequency-variable module of described signal conversion processes unit comprises successively and to connect: one the one LC filter, one first frequency converter, one the 2nd LC filter, one the one IF amplifier.
5. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: second frequency-variable module of described signal conversion processes unit comprises successively and to connect: one second frequency converter, the high squareness factor dielectric filter of one the one RF, one the one RF amplifier.
6. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: the 3rd frequency-variable module of described signal conversion processes unit comprises successively and to connect: one the 3rd frequency converter, one the one LC low pass filter, one the 2nd IF amplifier, one the 2nd LC low pass filter.
7. realize circuit according to claim 4 or 5 or 6 described a kind of digital TV transmitter exciter radiofrequency signals, it is characterized in that: described first frequency converter connects the first local oscillation signal generator, second frequency converter connects the second local oscillation signal generator, and the 3rd frequency converter connects the 3rd local oscillation signal generation module.
8. a kind of digital TV transmitter exciter radiofrequency signal according to claim 1 realizes circuit, it is characterized in that: described nonlinear distortion signal gathering unit comprises successively and to connect: one second numerical control ATT, one the 3rd LC low pass filter, one the 4th frequency converter, one the 4th LC low pass filter, one the 3rd RF amplifier, the high squareness factor dielectric filter of one the 2nd RF, one the 5th frequency converter, one the 3rd LC filter, one the 2nd IF amplifier, one the 4th LC filter; Described the 4th frequency converter connects the 3rd local oscillation signal generation module, and the 5th frequency converter connects the 6th frequency converter of the local oscillation signal of described first a local oscillation signal generator of reception and the 4th local oscillation signal generator.
9. a kind of digital TV transmitter exciter radiofrequency signal according to claim 6 realizes circuit, and it is characterized in that: a described LC low pass filter, the 2nd LC low pass filter are the filter that comprises whole digital television signal frequency range.
10. a kind of digital TV transmitter exciter radiofrequency signal according to claim 8 realizes circuit, and it is characterized in that: described the 3rd LC low pass filter, the 4th LC low pass filter are the filter that comprises whole digital television signal frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205299445U CN201830349U (en) | 2010-09-15 | 2010-09-15 | Radio-frequency implementation circuit of transmitter exciter of digital television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205299445U CN201830349U (en) | 2010-09-15 | 2010-09-15 | Radio-frequency implementation circuit of transmitter exciter of digital television |
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| CN201830349U true CN201830349U (en) | 2011-05-11 |
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| CN2010205299445U Expired - Fee Related CN201830349U (en) | 2010-09-15 | 2010-09-15 | Radio-frequency implementation circuit of transmitter exciter of digital television |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281408A (en) * | 2011-08-16 | 2011-12-14 | 福建三元达通讯股份有限公司 | Outdoor high-efficiency digital television transmitter |
| CN102457289A (en) * | 2011-12-28 | 2012-05-16 | 熊猫电子集团有限公司 | Exciter setting method and exciter of shortwave four-channel diversity transmission based on space time coding |
-
2010
- 2010-09-15 CN CN2010205299445U patent/CN201830349U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281408A (en) * | 2011-08-16 | 2011-12-14 | 福建三元达通讯股份有限公司 | Outdoor high-efficiency digital television transmitter |
| CN102457289A (en) * | 2011-12-28 | 2012-05-16 | 熊猫电子集团有限公司 | Exciter setting method and exciter of shortwave four-channel diversity transmission based on space time coding |
| CN102457289B (en) * | 2011-12-28 | 2013-10-16 | 熊猫电子集团有限公司 | Exciter setting method and exciter of shortwave four-channel diversity transmission based on space time coding |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20140915 |
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| EXPY | Termination of patent right or utility model |