CN101895256A - Digital signal amplitude modulation circuit - Google Patents
Digital signal amplitude modulation circuit Download PDFInfo
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- CN101895256A CN101895256A CN2010102272182A CN201010227218A CN101895256A CN 101895256 A CN101895256 A CN 101895256A CN 2010102272182 A CN2010102272182 A CN 2010102272182A CN 201010227218 A CN201010227218 A CN 201010227218A CN 101895256 A CN101895256 A CN 101895256A
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Abstract
The invention belongs to the technical field of electronics, in particular to a digital signal amplitude modulation circuit, which solves the technical problems of unreasonable design and difficult realization of digital amplitude modulation and the like in the prior art. The amplitude modulation circuit comprises a resonance power amplifier, wherein a carrier wave signal source is connected on the base electrode circuit of the resonance power amplifier, a digital signal source is connected on a collector electrode circuit, and the resonance power amplifier is also connected with a parallel resonant circuit which is connected with a matching network output module. Compared with the prior art, the digital signal amplitude modulation circuit has the advantages of reasonable design, simple structure, easy implementation, capability of conveniently realizing digital signal amplitude modulation, good safety performance and long service life.
Description
Technical field
The invention belongs to electronic technology field, relate to Digital Signal Processing, especially relate to a kind of digital signal amplitude modulation circuit.
Background technology
In communication system, modulator approach commonly used comprises Modulation and Amplitude Modulation, frequency modulation(FM) and phase modulated.Use modulation signal U during Modulation and Amplitude Modulation
Ω(t) control carrier signal U.(t) amplitude makes the rule variation of the amplitude of carrier signal according to modulation signal, and its theory diagram as shown in Figure 1.That Fig. 2 shows is modulation signal U
Ω(t) oscillogram, what Fig. 3 showed is the oscillogram of carrier signal Uc (t), Fig. 4 is modulated signal Uo (t) oscillogram after modulation is finished.
AM modulation high level modulation circuit commonly used, high level modulation is that tuned power amplifier and modulation circuit are lumped together, and modulates on the basis of more high-power level.Its advantage is that circuit structure is simple, and modulated signal can directly reach the requirement of transmitting power, helps improving the efficient of transmitter.High level modulation commonly used has base modulation, collector amplitude modulation.The advantage of base modulation circuit is that the power requirement that can provide for modulating signal source is not high, and its shortcoming is that linear degree is bad.Transistor VT (tuned power amplifier) is operated in under-voltage condition, and efficient is lower.Traditional collector amplitude modulation circuit theory as shown in Figure 5.Among the figure: modulation signal U
Ω(t) be connected on the base loop of transistor VT (tuned power amplifier), Vcc lumps together with the collector electrode power supply, forms composite power supply power supply Ucc (t).Therefore, Ucc (t)=Ucc+U
ΩM Cos Ω t.Thus, the collector electrode supply power voltage of transistor VT (tuned power amplifier) is with U
Ω(t) variation changes.
Along with the develop rapidly of digital technology, a lot of places need directly be modulated with digital signal, form digital AM ripple, and coupling transformer M3 generally are the low frequency coupling transformers in the traditional circuit, and digital signal can not directly be coupled.For this reason, people have carried out long-term exploration, have proposed various solutions.For example, Chinese patent literature discloses a kind of digital am (AM) reflector [application number: CN200680020967.X] with pulse-width modulation RF excitation.When being unlocked, a plurality of RF amplifiers amplify identical amount with the RF pumping signal that applies respectively, so that unit step RF to be provided output.Encoder feeding opening signal, to open a plurality of RF amplifiers, wherein the number of the RF amplifier of Kai Qiing changes along with the value of the audio signal that applies.The width of unit step RF output changes along with the number of the RF amplifier of opening.
The somebody has invented a kind of digital audio frequency processing method [application number: CN200510004904.2] of analog AM medium wave broadcast transmitter digital improvement, it is a kind of medium wave broadcast transmitter of will simulating when transforming digital broadcasting (DRM) transmitter as, the implementation method of audio frequency branch road Digital Signal Processing.The intelligent gain-adjusted that this method can be carried out power back-off to the transmitting power and the supply power voltage of transmitter.Realized software radio design concept flexibly by being provided with of software.It adopts based on rising sampling processing and obtains digital signal envelope composition, and carries out intelligent compensation according to transmitter power Control Parameter and supply power voltage, to obtain best modulation and power emission efficient.
Though such scheme has been realized the amplitude modulation operation to digital signal to a certain extent, it is higher still to exist cost, is difficult to realize direct modulation, and digital signal can not directly be coupled, technical problems such as the linear degree difference of signal.
Summary of the invention
The objective of the invention is at the problems referred to above, provide a kind of reasonable in design, simple in structure, easy to implement, the digital signal amplitude modulation circuit of stable work in work.
For achieving the above object, the present invention has adopted following technical proposal: this digital modulation signal circuit, it is characterized in that, this modulation circuit comprises tuned power amplifier, on the base loop of tuned power amplifier, be connected with the carrier signal source, on collector loop, be connected with derived digital signal, on tuned power amplifier, also be connected with the shunt-resonant circuit, on the shunt-resonant circuit, be connected with the matching network output module.
In above-mentioned digital signal amplitude modulation circuit, described derived digital signal is the Digital Signals power module, comprise first power supply, second source, high power digital switch and digital modulation signals source, described first power supply, second source and digital modulation signals source all are connected with the high power digital switch, and the output of high power digital switch links to each other with the collector loop of tuned power amplifier.
In above-mentioned digital signal amplitude modulation circuit, be serially connected with first anti-back flow circuit between described first power supply and the high power digital switch, be serially connected with second anti-back flow circuit between described second source and the high power digital switch.
In above-mentioned digital signal amplitude modulation circuit, link to each other by coupling transformer between the base loop of described carrier signal source and tuned power amplifier.
Compared with prior art, the advantage of this digital modulation signal circuit is: 1, reasonable in design, simple in structure, easy to implement, can realize digital signal amplitude modulation easily.2, security performance is good, long service life.
Description of drawings
Fig. 1 is the theory diagram that prior art provides.
Fig. 2 is the modulation signal waveform figure that prior art provides.
Fig. 3 is the carrier signal waveform figure that prior art provides.
Fig. 4 is the modulated signal oscillogram that prior art provides.
Fig. 5 is the structured flowchart that prior art provides.
Fig. 6 is a structured flowchart provided by the invention.
Fig. 7 is a derived digital signal structured flowchart provided by the invention.
Fig. 8 is digital signal waveform figure provided by the invention.
Fig. 9 is carrier signal waveform figure provided by the invention.
Figure 10 is a modulated signal oscillogram provided by the invention.
Embodiment
Shown in Fig. 6-10, this digital modulation signal circuit comprises tuned power amplifier VT, on the base loop of tuned power amplifier VT, be connected with carrier signal source 1, on collector loop, be connected with derived digital signal 2, on tuned power amplifier VT, also be connected with shunt-resonant circuit LC.On the LC of shunt-resonant circuit, be connected with matching network output module 3.Derived digital signal 2 is the Digital Signals power module, comprises first power supply 21, second source 22, high power digital switch 23 and digital modulation signals source 24.First power supply 21, second source 22 and digital modulation signals source 24 all are connected with high power digital switch 23, and the output of high power digital switch 23 links to each other with the collector loop of tuned power amplifier VT.Be serially connected with first anti-back flow circuit 25 between first power supply 21 and the high power digital switch 23, be serially connected with second anti-back flow circuit 26 between described second source 22 and the high power digital switch 23.Link to each other by coupling transformer between the base loop of carrier signal source 1 and tuned power amplifier VT.
The present invention can directly carry out collector amplitude modulation to digital signal.Its basic thought still adopts the basic structure of conventional collector modulation circuit, but modulated digital signal is not to be coupled to base loop with coupling transformer, but adopts the mode of derived digital signal directly to power to base loop.Derived digital signal is to be subjected to want modulated digital signal directly actuated.Its circuit working process is summarized as follows: tuned power amplifier VT (being transistor) is operated in two class states.Carrier signal Uc (t)=Ucm Cos ω ct.Shunt-resonant circuit LC resonance is on ω c frequency, and tuned power amplifier VT is in overvoltage condition work, and at this moment the amplitude Ucm of collector electrode output high voltage will change with collector supply voltage, forms the digital am ripple, and the digital am waveform as shown in figure 10.
The Digital Signals power module course of work is as follows: two groups of power supplys, promptly the output voltage of first power supply 21, second source 22 is respectively V1, V2, modulated digital signal to go to control the output of V1, V2 respectively, forms the power supply of collector amplitude modulation circuit.Realize collector amplitude modulation.The effect of anti-back flow circuit is to prevent that two groups of power supplys from influencing each other.As V1 during greater than V2, deal with improperly, V1 will charge to V2, causes the damage of power module.Can effectively avoid above-mentioned condition and be provided with anti-back flow circuit.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technical staff of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used more term morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (4)
1. digital signal amplitude modulation circuit, it is characterized in that, this modulation circuit comprises tuned power amplifier (VT), on the base loop of tuned power amplifier (VT), be connected with carrier signal source (1), on collector loop, be connected with derived digital signal (2), on tuned power amplifier (VT), also be connected with shunt-resonant circuit (LC), on shunt-resonant circuit (LC), be connected with matching network output module (3).
2. digital signal amplitude modulation circuit according to claim 1, it is characterized in that, described derived digital signal (2) is the Digital Signals power module, comprise first power supply (21), second source (22), high power digital switch (23) and digital modulation signals source (24), described first power supply (21), second source (22) all are connected with high power digital switch (23) with digital modulation signals source (24), and the output of high power digital switch (23) links to each other with the collector loop of tuned power amplifier (VT).
3. digital signal amplitude modulation circuit according to claim 2, it is characterized in that, be serially connected with first anti-back flow circuit (25) between described first power supply (21) and the high power digital switch (23), be serially connected with second anti-back flow circuit (26) between described second source (22) and the high power digital switch (23).
4. according to claim 1 or 2 or 3 described digital signal amplitude modulation circuits, it is characterized in that, link to each other by coupling transformer between the base loop of described carrier signal source (1) and tuned power amplifier (VT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102272182A CN101895256A (en) | 2010-07-15 | 2010-07-15 | Digital signal amplitude modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102272182A CN101895256A (en) | 2010-07-15 | 2010-07-15 | Digital signal amplitude modulation circuit |
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| CN101895256A true CN101895256A (en) | 2010-11-24 |
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ID=43104354
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| CN2010102272182A Pending CN101895256A (en) | 2010-07-15 | 2010-07-15 | Digital signal amplitude modulation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427329A (en) * | 2011-11-28 | 2012-04-25 | 苏州工业职业技术学院 | Simple amplitude modulation device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239350A (en) * | 1999-05-05 | 1999-12-22 | 张火荣 | Load regulation technique and its communication method |
| EP1848106A2 (en) * | 2004-12-31 | 2007-10-24 | Postech Foundation | Power amplifying apparatus using asymmetric power drive |
| CN101075805A (en) * | 2007-04-24 | 2007-11-21 | 华南理工大学 | Pulse amplitude wave-inspection circuit |
| CN201726359U (en) * | 2010-07-15 | 2011-01-26 | 常州华辉电子设备有限公司 | Digital signal amplitude modulating circuit |
-
2010
- 2010-07-15 CN CN2010102272182A patent/CN101895256A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239350A (en) * | 1999-05-05 | 1999-12-22 | 张火荣 | Load regulation technique and its communication method |
| EP1848106A2 (en) * | 2004-12-31 | 2007-10-24 | Postech Foundation | Power amplifying apparatus using asymmetric power drive |
| CN101075805A (en) * | 2007-04-24 | 2007-11-21 | 华南理工大学 | Pulse amplitude wave-inspection circuit |
| CN201726359U (en) * | 2010-07-15 | 2011-01-26 | 常州华辉电子设备有限公司 | Digital signal amplitude modulating circuit |
Non-Patent Citations (1)
| Title |
|---|
| 熊耀辉: "《高频电子线路》", 31 July 1997, article "4-2-2 集电极调幅电路", pages: 192-195 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427329A (en) * | 2011-11-28 | 2012-04-25 | 苏州工业职业技术学院 | Simple amplitude modulation device |
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Application publication date: 20101124 |