CN105846786B - A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion - Google Patents
A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion Download PDFInfo
- Publication number
- CN105846786B CN105846786B CN201610170810.0A CN201610170810A CN105846786B CN 105846786 B CN105846786 B CN 105846786B CN 201610170810 A CN201610170810 A CN 201610170810A CN 105846786 B CN105846786 B CN 105846786B
- Authority
- CN
- China
- Prior art keywords
- triode
- connects
- emitter
- resistance
- base stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses the power amplifiers that a kind of superposition superaudio signal eliminates intermodulation distortion comprising triode VT1 ~ VT8, resistance R1 ~ R11, capacitance C1 ~ C7, inductance L1, diode D1 ~ D2；Advantage is：Superaudio signal avoids the intermodulation distortion problem occurred when two triode alternate conductions of push-pull power amplifier, does not influence requirement of the conventional audio power amplifier to sound quality；Present invention eliminates in traditional AB classes power amplifier in order to which the direct current biasing for keeping lightly conducting state and using reduces power consumption to improve overall efficiency；Since method provided by the invention reduces DC power, to also reduce the temperature of two triodes of push-pull power amplifier in high-power amplification, the stability and service life of High-power amplifier are improved；The present invention has higher practicability, and has certain economic benefit and social benefit.
Description
Technical field
The invention belongs to Audio power amplifier technical fields, are related to a kind of work(of superposition superaudio signal elimination intermodulation distortion
Electric discharge road.
Background technology
In audio-frequency amplifier, widely used B classes power amplification circuit shown in Fig. 4, its two pipes take turns to operate
In the positive-negative half-cycle of input signal.As known, this circuit the problem of there is intermodulation distortions.To obtain smaller mistake
True and higher efficiency generally uses the AB class power amplifiers shown in fig. 5 with quiescent biasing.
In the positive and negative intersection of output waveform caused by intermodulation distortion is nonlinear characteristic when transistor is in low current
The distortion at place.Have the shortcomings that there are three apparent for static power amplifier biasing：First, it is necessary to well-designed suitable biasing.Such as
Fruit biasing is insufficient, cannot completely eliminate intermodulation distortion, and output voltage waveforms is prevented to hand over more region from continuously excessive in positive-negative half-cycle,
If biasing is too big, the loss of pipe can be increased.Second, quiescent biasing is not a fixed amount, but a variable,
It, which can be influenced to make by factors such as temperature to design more suitable bias originally, becomes improper.Such as increase when crystal tube temperature rises
When, so that quiescent current is increased, and the increase of quiescent current further increases the temperature of pipe, may finally transistor be caused to burn
It ruins.In order to protect the transistor of power amplifier, increase to set temperature-compensating original paper and radiator, circuit is made to become complicated.
As power amplifier, the height of delivery efficiency directly influences the radiator volume of power supply and power amplifier grade.AB class power amplifiers
Machine is susceptible to intermodulation distortion in small signal, and fever is also easy when power is big.
Invention content
Technical problem to be solved by the invention is to provide a kind of superpositions that can be eliminated intermodulation distortion phenomenon and reduce power consumption
Superaudio signal eliminates the power amplifier of intermodulation distortion.
Used technical solution is to solve above-mentioned technical problem：A kind of superposition superaudio signal eliminates intermodulation distortion
Power amplifier comprising triode VT1 ~ VT8, resistance R1 ~ R11, capacitance C1 ~ C7, inductance L1, diode D1 ~ D2, terminal A and
Terminal B；
Audio signal connects the emitter of the triode VT1 through the inductance L1；The emitter of the triode VT1 is through institute
State resistance R1 ground connection；The base stage of the triode VT1 connects the emitter of the triode VT7 through the resistance R11；
The collector of the triode VT1 and the base stage of triode VT6 connect the terminal A respectively；The triode VT2's
The base stage of collector and triode VT5 connect the terminal B respectively；
The terminal B connects the anode of the diode D1；The terminal A connects the cathode of the diode D1；
The base stage of the triode VT7 connects the emitter of the triode VT5；The base stage of the triode VT8 connects described
The emitter of triode VT6；
The resistance R8 is connected between the emitter of the triode VT5 and the emitter of the triode VT6；
The emitter of the triode VT7 connects the emitter of triode VT8；
The capacitance C6 connects with capacitance C7 to be followed by between+27V DC power supplies and ground；
The emitter of the triode VT7 connects one end of sound equipment LS through the capacitance C5；The capacitance C6 and capacitance C7's
Node connects the other end of sound equipment LS；
The resistance R9 connects with resistance R10 to be followed by between the base stage and ground of the triode VT8；The resistance R9 with
The node of resistance R10 connects the base stage of the triode VT1；
The capacitance C4 is connected between the base stage and collector of the triode VT1；
The grounded collector of the triode VT6；The grounded collector of the triode VT8；The collection of the triode VT5
Electrode connects+27V DC power supplies；The collector of the triode VT7 connects+27V DC power supplies；
The resistance R2 connects between the emitter and+27V DC power supplies of the triode VT2；
The base stage of the triode VT2 connects the emitter of the triode VT3；
The collector of the triode VT3 connects+27V DC power supplies；The emitter of the triode VT3 is through the resistance R6
Ground connection；
The emitter of the triode VT4 connects+27V DC power supplies；The collector of the triode VT4 is through the resistance R7
Ground connection；The base stage of the triode VT4 connects the base stage of the triode VT2 through the resistance R3, diode D2 successively；
The capacitance C3 is connected between the collector and base stage of the triode VT4；
The resistance R4 connects with R5 to be followed by between the base stage and the collector of triode VT4 of the triode VT3；Institute
Capacitance C1 is stated to be connected between the base stage and+27V DC power supplies of the triode VT3；The capacitance C2 be connected on the resistance R4 with
Between the node of R5 and+27V DC power supplies.
The beneficial effects of the invention are as follows：Superaudio signal, which avoids, to be occurred when two triode alternate conductions of push-pull power amplifier
Intermodulation distortion problem；It is broadcast in sound equipment LS that will not be below after superaudio signal completes the effect for breaking through intermodulation distortion region
It releases, therefore does not interfere with requirement of the conventional audio power amplifier to sound quality；Due to the effect of superaudio signal so that
Two triodes of push-pull power amplifier can successfully alternate conduction to eliminate in traditional AB classes power amplifier to keep lightly conducting shape
State and the direct current biasing used reduces power consumption to improve overall efficiency；Since method provided by the invention reduces directly
Power consumption is flowed, to also reduce the temperature of two triodes of push-pull power amplifier in high-power amplification, improves high-power work(
The stability and service life put；The present invention has higher practicability, and has certain economic benefit and social benefit.
Description of the drawings
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is the comparison diagram that 1kHz inputs audio and A point waveforms.
Fig. 3 is to export audio and input the comparison of wave shape figure of audio.
Fig. 4 is B class power amplification circuits.
Fig. 5 is the AB class power amplifiers with quiescent biasing.
Specific implementation mode
The embodiment shown in Fig. 1-5 is it is found that it includes triode VT1 ~ VT8, resistance R1 ~ R11, capacitance C1 ~ C7, inductance
L1, diode D1 ~ D2, terminal A and terminal B；
Audio signal connects the emitter of the triode VT1 through the inductance L1；The emitter of the triode VT1 is through institute
State resistance R1 ground connection；The base stage of the triode VT1 connects the emitter of the triode VT7 through the resistance R11；
The collector of the triode VT1 and the base stage of triode VT6 connect the terminal A respectively；The triode VT2's
The base stage of collector and triode VT5 connect the terminal B respectively；
The terminal B connects the anode of the diode D1；The terminal A connects the cathode of the diode D1；
The base stage of the triode VT7 connects the emitter of the triode VT5；The base stage of the triode VT8 connects described
The emitter of triode VT6；
The resistance R8 is connected between the emitter of the triode VT5 and the emitter of the triode VT6；
The emitter of the triode VT7 connects the emitter of triode VT8；
The capacitance C6 connects with capacitance C7 to be followed by between+27V DC power supplies and ground；
The emitter of the triode VT7 connects one end of sound equipment LS through the capacitance C5；The capacitance C6 and capacitance C7's
Node connects the other end of sound equipment LS；
The resistance R9 connects with resistance R10 to be followed by between the base stage and ground of the triode VT8；The resistance R9 with
The node of resistance R10 connects the base stage of the triode VT1；
The capacitance C4 is connected between the base stage and collector of the triode VT1；
The grounded collector of the triode VT6；The grounded collector of the triode VT8；The collection of the triode VT5
Electrode connects+27V DC power supplies；The collector of the triode VT7 connects+27V DC power supplies；
The emitter of the triode VT2 connects+27V DC power supplies；The base stage of the triode VT2 connects the triode
The emitter of VT3；
The collector of the triode VT3 connects+27V DC power supplies；The emitter of the triode VT3 is through the resistance R6
Ground connection；
The emitter of the triode VT4 connects+27V DC power supplies；The collector of the triode VT4 is through the resistance R7
Ground connection；The base stage of the triode VT4 connects the base stage of the triode VT2 through the resistance R3, diode D2 successively；
The capacitance C3 is connected between the collector and base stage of the triode VT4；
The resistance R4 connects with R5 to be followed by between the base stage and the collector of triode VT4 of the triode VT3；Institute
Capacitance C1 is stated to be connected between the base stage and+27V DC power supplies of the triode VT3；The capacitance C2 be connected on the resistance R4 with
Between the node of R5 and+27V DC power supplies.
The model 9014 of the triode VT1；The model 9014 of the triode VT2；The model of the triode VT3
9014；The model 9015 of the triode VT4；The model 9014 of the triode VT5；The model 9015 of the triode VT6；
The model 9014 of the triode VT7；The model 9015 of the triode VT8.
The present invention eliminates the intermodulation distortion in AB class power amplifiers using superposition superaudio signal, and solves to hold when power is big
The problem of easily generating heat.
The problem of biasing resistor of traditional AB genus audio power amplifiers will bring DC power.In order to ensure traditional AB classes
In power amplifier two recommend triode can alternate conduction, in alternate conduction moment, two pipes will maintain lightly conducting
State is not to generating intermodulation distortion, it is desirable to provide direct current biasing resistance, the problem of thus bringing DC power.
If eliminating the direct current biasing of AB class audio frequency power amplifications, B class power amplifiers are known as, then centainly will produce friendship
The problem of being more distorted, this will make the amplification to audio signal generate serious distortion, and sound quality is impaired.
The problem of traditional AB class audio frequencies power amplifier fever.Due to there is the presence of biasing resistor, by the direct current for recommending triode
Electric current can not possibly be zero, and when power is larger, with the increase of electric current, the temperature falling-rising of triode is high, seriously affects power
The stability of amplifier and service life.
The present invention removes the direct current biasing of conventional power amplifier；Superaudio signal is generated using oscillating circuit（20-
40kHz）；This superaudio signal is superimposed in the audio signal of input.Circuit uses differential both-end input mode, therefore itself
There is the preferable ability for inhibiting work mode noise and distortion.
The common-base circuit being made of triode TV1 is feedback amplification, is that a performance height, succinct current feedback are put
Big device, the open-loop gain of entire current feedback amplifier depend on the resistance value size of R9, R10 and R11.It acts as allow power amplifier
Into profound and negative feedbck.
RC phase-shift networks form RC phase shift oscillating circuits with triode TV3, are the piths of superaudio oscillating circuit.
Wherein, C1, C2, C3 and R3, R4, R5 constitute RC phase-shift networks, and 180 ° of phase shift；Triode VT3 emitters export, high resistant
Input can be with RC phase-shift network good matches.Triode VT4 reverse phases amplify oscillator signal and and feed back to phase-shift network；Two poles
Pipe D2 provides an appropriate bias state to triode VT3；Triode VT3, triode VT4 circuits have strong DC negative-feedback,
So that circuit gain is stable, wave distortion is small.Triode VT2 amplifications secondary to oscillator signal and the Supersonic for reversely exporting 20KHZ
Frequency number.
Triode VT5, triode VT6, triode VT7, triode VT8 constitute typical compound complementary push-pull output
Grade.Wherein triode TV5 and triode TV7 forms a multiple tube, equivalent at a NPN type triode；Triode TV6 and three
Pole pipe TV8 is equivalent to a PNP type triode.Diode D1 is output stage biased circuit.
Capacitance C6 is power filtering capacitor.Capacitance C7 is audio filter capacitor.Power filtering capacitor is for filtering out in power supply
Alternating component interference；Audio filter capacitor filters out superaudio amplified signal, avoids feeding back to the self-excitation that front end may occur.
Audio signal enters feedback amplification by L1.The effect of L1 is to inhibit the High-frequency Interference of input audio signal, is prevented
Interference only is generated to the superaudio signal inside power amplifier.
Audio signal passes through feedback amplification, the same phase of audio signal phase of A point signal phases and input in Fig. 3.Due to
Internal resistance is small after D1 conductings, and A points can consider that size and phase are identical with the signal that B points are added in the base stage of VT5 and VT6.And
It is superimposed the 30kHz superaudio signals generated by superaudio oscillating circuit here.Waveform is as shown in Figure 2.
At this point, the audio signal of input due to the effect of superposition superaudio signal and negative-feedback makes its quiescent point can be to
Upper offset.Two groups of complementary Darlington transistors of output stage can in this way be both turned in sine wave whole cycle, is handed over so eliminating
More it is distorted.Exports audio signal is identical as the quiescent point of input audio signal, in output end serial capacitors C5.Waveform such as Fig. 3
It is shown.
During triode VT1 collectors export positive half cycle signal, triode VT5 and triode VT7 conductings, amplification, three poles
Pipe VT6 and triode VT8 is in cut-off state；During triode VT1 collectors export negative half-cycle signal, triode VT6 and three
Pole pipe VT8 conductings, amplification, triode VT5 and triode VT7 cut-offs.
The signal of two multiple tubes output, which exports and passes through R11, feeds back to input stage, and input stage puts feedback signal
A points are reached after big, are superimposed superaudio signal again and are carried out audio amplification.The effect of negative-feedback is to enable the quiescent operation of audio signal
Point is stablized, and avoids allowing transistor to be easy fever due to the influence of extraneous factor.
It is demonstrated experimentally that using circuit of the present invention to power amplifier, as long as appropriate selection parameter, friendship can be completely eliminated and more lost
Very.And when input audio signal frequency is higher, it still can effectively eliminate intermodulation distortion.The present invention not only eliminates work(
Intermodulation distortion in electric discharge road, and make transistor by ectocine and be easy to be improved the problem of fever.
Embodiment described above is merely a preferred embodiment of the present invention, and the simultaneously exhaustion of non-present invention possible embodiments.
It is any aobvious to made by it under the premise of without departing substantially from the principle of the invention and spirit for persons skilled in the art
And the change being clear to, it should all be contemplated as falling within the claims of the present invention.
Claims (2)
1. a kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion, it is characterised in that：Including triode VT1 ~ VT8,
Resistance R1 ~ R11, capacitance C1 ~ C7, inductance L1, diode D1 ~ D2, terminal A and terminal B；
Audio signal connects the emitter of the triode VT1 through the inductance L1；The emitter of the triode VT1 is through the electricity
Hinder R1 ground connection；The base stage of the triode VT1 connects the emitter of the triode VT7 through the resistance R11；
The collector of the triode VT1 and the base stage of triode VT6 connect the terminal A respectively；The current collection of the triode VT2
The base stage of pole and triode VT5 connect the terminal B respectively；
The terminal B connects the anode of the diode D1；The terminal A connects the cathode of the diode D1；
The base stage of the triode VT7 connects the emitter of the triode VT5；The base stage of the triode VT8 connects three pole
The emitter of pipe VT6；
The resistance R8 is connected between the emitter of the triode VT5 and the emitter of the triode VT6；
The emitter of the triode VT7 connects the emitter of triode VT8；
The capacitance C6 connects with capacitance C7 to be followed by between+27V DC power supplies and ground；
The emitter of the triode VT7 connects one end of sound equipment LS through the capacitance C5；The node of the capacitance C6 and capacitance C7
Connect the other end of sound equipment LS；
The resistance R9 connects with resistance R10 to be followed by between the base stage and ground of the triode VT8；The resistance R9 and resistance
The node of R10 connects the base stage of the triode VT1；
The capacitance C4 is connected between the base stage and collector of the triode VT1；
The grounded collector of the triode VT6；The grounded collector of the triode VT8；The collector of the triode VT5
Connect+27V DC power supplies；The collector of the triode VT7 connects+27V DC power supplies；
The resistance R2 is connected between the emitter and+27V DC power supplies of the triode VT2；
The base stage of the triode VT2 connects the emitter of the triode VT3；
The collector of the triode VT3 connects+27V DC power supplies；The emitter of the triode VT3 connects through the resistance R6
Ground；
The emitter of the triode VT4 connects+27V DC power supplies；The collector of the triode VT4 connects through the resistance R7
Ground；The base stage of the triode VT4 connects the base stage of the triode VT2 through the resistance R3, diode D2 successively；
The capacitance C3 is connected between the collector and base stage of the triode VT4；
The resistance R4 connects with R5 to be followed by between the base stage and the collector of triode VT4 of the triode VT3；The electricity
Hold C1 to be connected between the base stage and+27V DC power supplies of the triode VT3；The capacitance C2 is connected on the resistance R4's and R5
Between node and+27V DC power supplies.
2. a kind of superposition superaudio signal according to claim 1 eliminates the power amplifier of intermodulation distortion, it is characterised in that：
Triode VT1 ~ the VT3, triode VT5, triode VT7 model be 9014；The model 9015 of the triode VT4,
Triode VT6, triode VT8 model be 9015.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610170810.0A CN105846786B (en) | 2016-03-24 | 2016-03-24 | A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610170810.0A CN105846786B (en) | 2016-03-24 | 2016-03-24 | A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105846786A CN105846786A (en) | 2016-08-10 |
| CN105846786B true CN105846786B (en) | 2018-10-16 |
Family
ID=56583434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610170810.0A Active CN105846786B (en) | 2016-03-24 | 2016-03-24 | A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105846786B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855252B (en) * | 2019-11-20 | 2023-07-14 | 许昌开普检测研究院股份有限公司 | Current spreading circuit of power operational amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205622601U (en) * | 2016-03-24 | 2016-10-05 | 河北师范大学 | Super audio signal that superposes eliminates crossover distortion's power amplifier circuit |
-
2016
- 2016-03-24 CN CN201610170810.0A patent/CN105846786B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205622601U (en) * | 2016-03-24 | 2016-10-05 | 河北师范大学 | Super audio signal that superposes eliminates crossover distortion's power amplifier circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105846786A (en) | 2016-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100593902C (en) | Radio frequency power amplifier | |
| CN103023440B (en) | Circuit for improving linearity of power amplifier | |
| CN105763190B (en) | Low phase noise rf frequency combiner circuit | |
| CN209448712U (en) | A kind of high-power linear high frequency amplifier | |
| CN207869070U (en) | Active biased darlington structure amplifier | |
| CN110445477A (en) | A kind of data-signal distortion adjusting circuit | |
| CN105846786B (en) | A kind of superposition superaudio signal eliminates the power amplifier of intermodulation distortion | |
| CN205622601U (en) | Super audio signal that superposes eliminates crossover distortion's power amplifier circuit | |
| CN205160476U (en) | Power amplifier with distortion compensating circuit | |
| CN205430183U (en) | Intercom audio power amplifier circuit | |
| CN103944521B (en) | A kind of electric current injecting type audio-frequency power amplifier | |
| CN113472302A (en) | Automatic adjustment A class circuit | |
| CN105978497A (en) | Ripple suppression circuit based audio power amplification system | |
| CN201854247U (en) | Impedance matching power amplification output circuit | |
| CN208836000U (en) | A kind of adjustable DC output circuit | |
| CN216086595U (en) | Automatic adjustment A class circuit | |
| CN203761465U (en) | High frequency video signal compensating circuit | |
| CN106026943A (en) | Audio power amplification system based on emitter following circuit | |
| CN104936095A (en) | Audio processing system based on triode common-emitter symmetric amplification circuit | |
| CN210007676U (en) | audio amplifying circuit based on operational amplifier | |
| CN113922768B (en) | Darlington tube high-fidelity audio power amplifier | |
| CN204290891U (en) | A kind of wideband power amplifer circuit | |
| CN217216508U (en) | Power amplifier with selectable types | |
| CN103873742B (en) | For the compensation circuit of high-frequency video signal | |
| CN106026942A (en) | Audio power amplification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191218 Address after: 050000 room 510, unit 4, Hantong business building, No.88 Yanshan street, hi tech Zone, Shijiazhuang City, Hebei Province Patentee after: Hebei far haha Communications Technology Co., Ltd. Address before: 050024 No. 20 South Second Ring Road, Hebei, Shijiazhuang Patentee before: Hebei Normal University |
|
| TR01 | Transfer of patent right |