CN203590163U - Audio power amplifier - Google Patents
Audio power amplifier Download PDFInfo
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- CN203590163U CN203590163U CN201320674515.0U CN201320674515U CN203590163U CN 203590163 U CN203590163 U CN 203590163U CN 201320674515 U CN201320674515 U CN 201320674515U CN 203590163 U CN203590163 U CN 203590163U
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- 102100033014 Tyrosine-protein phosphatase non-receptor type 13 Human genes 0.000 claims description 17
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- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 101100244438 Alkaliphilus metalliredigens (strain QYMF) pnp3 gene Proteins 0.000 claims description 7
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- 101100244439 Alkaliphilus metalliredigens (strain QYMF) pnp4 gene Proteins 0.000 description 3
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Abstract
The utility model provides an audio power amplifier which comprises a first power amplification unit and a second power amplification unit as well as an audio input module, wherein each power amplification unit is provided with a first input end, a second input end and an output end; the first input end of the first power amplification unit is used for receiving a first audio input signal, and the second input end of the first power amplification unit is connected with the first input end of the second power amplification unit through a resistor Rfb; the second input end of the second power amplification unit is connected with the alternating-current ground; the output end and the second input end of the first power amplification unit are connected with each other through a resistor Rc; the output end and the first input end of the second power amplification unit are connected with each other through a resistor Ra; the input end of the audio input module is used for receiving a second audio input signal, and the output end of the audio input module is connected with the second input end of the first power amplification unit; the audio input module is used for converting the second audio input signal into a current signal and inputting the current signal to a node connected with the audio input module through the output end of the audio input module.
Description
[technical field]
The utility model relates to Audio Design field, particularly a kind of audio-frequency power amplifier.
[background technology]
Fig. 1 shows existing a kind of reaction type BTL((Bridge-Tied-load, bridging load)) audio-frequency power amplifier, it comprises the first power amplifier unit AMP1 and the second power amplifier unit AMP2, its each power amplifier unit has first input end, the second input and output, the first input end audio reception input signal INPUT of the first power amplifier unit AMP1 wherein, the second input is connected with the first input end of the second power amplifier unit AMP2 by resistance R _ f b, the second input termination of the second power amplifier unit AMP2 exchanges ground AC-GND, the output of the first power amplifier unit AMP1 is connected with its second input through resistance R c, the output of the second power amplifier unit AMP2 is connected with its first input end through Ra.The output of the first power amplifier unit AMP1 is as the first output of described audio-frequency power amplifier, the output of the second power amplifier unit AMP2 is as the second output of described audio-frequency power amplifier, and load RL is connected between first output and the second output of described audio-frequency power amplifier.Conventionally, the resistance of resistance R c is the resistance of the resistance R _ f b of 10 times, and the output voltage V o on load RL is 21 times of audio input end INPUT input voltage Vi in theory, and about 26.4dB gains.
Yet the gain of existing reaction type is fixed as 26.4dB, there is no 0dB audio frequency input function.
[summary of the invention]
The purpose of this utility model is to provide a kind of audio-frequency power amplifier, and it not only can realize common Audio power amplifier, can also realize extra 0db audio frequency input function.
In order to address the above problem, according to an aspect of the present utility model, the utility model provides a kind of audio-frequency power amplifier, it comprises: the first power amplifier unit and the second power amplifier unit and audio frequency input module, its each power amplifier unit has first input end, the second input and output, wherein the first input end of the first power amplifier unit receives the first audio input signal, the second input is connected with the first input end of the second power amplifier unit by resistance R _ f b, the second input termination of the second power amplifier unit exchanges ground, the output of the first power amplifier unit is connected with its second input through resistance R c, the output of the second power amplifier unit is connected with its first input end through Ra, the input of audio frequency input module receives the second audio input signal, and its output is connected with the second input of the first power amplifier unit, audio frequency input module is converted to current signal by the second audio input signal, and current signal is inputted to the node of its connection by its output.
Compared with prior art, the audio-frequency power amplifier in the utility model has been set up audio frequency input module, makes it not only can realize common Audio power amplifier, can also realize extra 0db audio frequency input function.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.Wherein:
Fig. 1 is the example of existing reaction type BTL audio-frequency power amplifier;
Fig. 2 is reaction type BTL audio-frequency power amplifier in the utility model structural representation in one embodiment;
Fig. 3 is audio frequency input module in Fig. 2 structural representation in one embodiment;
Fig. 4 a-4c is three embodiment of the resting potential Circuit tuning in Fig. 3;
Fig. 5 is audio frequency input module structural representation in another embodiment.
[embodiment]
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Alleged " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model herein.Different local in this manual " in one embodiment " that occur not all refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally." connection " in the utility model, " being connected ", " joining " etc. represent electrical direct or indirect connection.
Please refer to shown in Fig. 2, it is reaction type BTL audio-frequency power amplifier in the utility model structural representation in one embodiment, described audio-frequency power amplifier comprises the first power amplifier unit APM1, the second power amplifier unit AMP2, resistance R a, Rfb and Ra, and audio frequency input module AUX.Each power amplifier unit has first input end, the second input and output, wherein the first input end of the first power amplifier unit AMP1 receives the first audio input signal INPUT, the second input is connected with the first input end of the second power amplifier unit AMP2 by resistance R _ f b, the second input termination of the second power amplifier unit AMP2 exchanges ground AC-GND, the output of the first power amplifier unit AMP1 is connected with its second input through resistance R c, and the output of the second power amplifier unit is connected with its first input end through Ra.Audio frequency input module AUX, its input receives the second audio input signal AUX-IN, its output is connected with the second input of the first power amplifier unit AMP1, wherein said audio frequency input module AUX is converted to current signal by the second audio input signal AUX-IN, and described current signal is inputted to the node a of its connection by its output.
The output of the first power amplifier unit AMP1 is as the first output of described audio-frequency power amplifier, the output of the second power amplifier unit AMP2 is as the second output of described audio-frequency power amplifier, and load RL is connected between first output and the second output of described audio-frequency power amplifier.Conventionally, the resistance of resistance R c is the resistance of the resistance R _ f b of 10 times, and the output voltage V o on load RL is 21 times of input voltage Vi of the first audio input signal INPUT in theory, and about 26.4dB gains.When the second audio input signal AUX-IN input audio frequency input module AUX, described audio-frequency power amplifier can be realized 0dB audio frequency input function, and now the power of input audio signal equals the power of output audio signal.
Fig. 3 is audio frequency input module AUX in Fig. 2 structural representation in one embodiment.As shown in Figure 3, described audio frequency input module AUX comprises biasing circuit 310 and output circuit 320.Described biasing circuit 310 provides bias current to described output circuit 320 based on described the second audio input signal AUX-IN.The output Iout of described output circuit 310 is the output of described audio frequency input module, and described output circuit 320 produces the current signal relevant to the second audio input signal AUX-IN based on described bias current, and exports by its output.
In the given embodiment of Fig. 3, described biasing circuit 310 comprises transistor PNP1, transistor NPN1, resistance R 4 and R6, resting potential Circuit tuning 311, and described output circuit 320 comprises transistor PNP2, resistance R 5 and R7 and transistor NPN2.
Described resting potential Circuit tuning comprises input AUX-IN, the first link c and the second link d.The emitter of transistor PNP1 is connected with power end Vcc by resistance R 4, and collector electrode is connected with the first link c of described resting potential Circuit tuning 311, and its base stage is connected with the base stage of transistor PNP2.The emitter of transistor NPN1 is connected with ground GND by resistance R 6, and collector electrode is connected with the second link d of described resting potential Circuit tuning, and its base stage is connected with the base stage of transistor NPN2.The emitter of transistor PNP2 is connected with power end Vcc by resistance R 5, collector electrode is connected with the collector electrode of transistor NPN2, the emitter of transistor NPN2 is by resistance R 7 and ground GND ground connection, the node Iout that the collector electrode of transistor NPN2 and PNP2 is connected is as the output of described output circuit, and the input of described resting potential Circuit tuning receives described the second audio input signal AUX-IN.
In one embodiment, the emitter area of transistor PNP1 is 1:N with the ratio of the emitter area of transistor PNP2, the emitter area of transistor NPN1 is 1:N with the ratio of the emitter area of transistor NPN2, the resistance ratio of resistance R 4 and R5 is 1:N, the resistance ratio of resistance R 6 and R7 is 1:N, the resistance ratio of resistance R 4 and R6 is 1:1, and wherein N is natural number, such as take N=2 in Fig. 3, is introduced as example.
When absence of audio input signal AUX-IN, the collector current value approximately equal of PNP1 and NPN1, the image current approximately equal of corresponding PNP2 and NPN2, output Iout no-output.When having audio input signal AUX-IN, the collector current value of PNP1 and NPN1 produces a difference α, this difference α is relevant to audio input signal AUX-IN, and the image current difference of corresponding PNP2 and NPN2 is N α doubly, and the output current of output Iout is N α doubly.This output current (being the current signal that described audio frequency input module AUX obtains according to the second audio input signal) N* α enters power amplifier feedback loop, forms power amplifier output, realizes 0dB function.
Because structure is different, may there is the difference of any in the bias current of transistor PNP2 and NPN2, and when input AUX-IN is without input, its output Iout still may export small electric current like this, thus the application while having influence on normal audio input.Therefore, in a preferred embodiment, described biasing circuit 310 also comprises transistor PNP3 and NPN3.The emitter of transistor PNP3 connects the base stage of transistor PNP1, and its base stage connects the collector electrode of transistor PNP1, its grounded collector GND.The emitter of transistor NPN3 connects the base stage of transistor NPN1, its base stage connects the collector electrode of transistor NPN1, its collector electrode meets power end Vcc, the emitter area of transistor PNP1 is 1:1 with the ratio of the emitter area of transistor PNP3, and the emitter area of transistor NPN1 is 1:1 with the ratio of the emitter area of transistor NPN3.Transistor PNP3 and NPN3 can be used for reducing bias current poor of transistor PNP2 and NPN2, and with when input AUX-IN is without input, its output Iout exports 0 electric current.Certainly, in other embodiments, if the difference of the bias current of transistor PNP2 and NPN2 itself is just very little, also can not adopt poor the circuit that suppresses of this bias current.
Described resting potential Circuit tuning 311 can be used for determining the resting potential of input AUX-IN.Fig. 4 a-4c is three embodiment of the resting potential Circuit tuning in Fig. 3.
As shown in Fig. 4 a, described resting potential Circuit tuning 311a comprises resistance R 1, R2 and R3, and voltage stabilizing didoe Vz.One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input AUX-IN of described resting potential Circuit tuning, the other end of resistance R 3 is as the second link d of described resting potential Circuit tuning, the other end of resistance R 2 is connected with the anode of voltage stabilizing didoe Vz, and the negative electrode of voltage stabilizing didoe Vz is as the first link c of described resting potential Circuit tuning.The resting potential that this kind of structure easily makes input on the lower side.
As shown in Figure 4 b, described resting potential Circuit tuning 311b comprises resistance R 1, R2 and R3.One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input AUX-IN of described resting potential Circuit tuning, the other end of resistance R 3 is as the second link d of described resting potential Circuit tuning, and the other end of resistance R 2 is as the first link c of described resting potential Circuit tuning.During Static Electro that this kind of structure easily makes input is biased.
As shown in Fig. 4 c, described resting potential Circuit tuning 311c comprises resistance R 1, R2 and R3, and voltage stabilizing didoe Vz.One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input AUX-IN of described resting potential Circuit tuning, the other end of resistance R 3 is connected with the negative electrode of voltage stabilizing didoe Vz, the anode of voltage stabilizing didoe Vz is as the second link d of described resting potential Circuit tuning, and the other end of resistance R 2 is as the first link c of described resting potential Circuit tuning.The resting potential that this kind of structure easily makes input on the upper side.
In addition, can also adjust resting potential by adjusting the resistance size ratio of R2 and R3.
Fig. 5 is audio frequency input module structural representation in another embodiment.Described audio frequency input module AUX comprises that biasing circuit 510 and a plurality of output circuit are such as 520 and 530.The structure of described biasing circuit is identical with the structure of biasing circuit 310 in Fig. 3, and the structure of each output circuit is identical with the structure of output circuit in Fig. 3.Each output circuit 520 or 530 comprises PNP transistor PNP2 being connected between power end Vcc and ground or PNP4 and NPN transistor NPN2 or NPN4,
The emitter of this PNP transistor PNP2 or PNP4 is connected with power end Vcc by a resistance, and base stage is connected with the base stage of transistor PNP1, and collector electrode is connected with the collector electrode of this NPN transistor NPN2 or NPN4.The emitter of this NPN transistor NPN2 or NPN4 is by a grounding through resistance, and its base stage is connected with the base stage of transistor NPN1.The connected node of this PNP transistor PNP2 or PNP4 and this NPN transistor NPN2 or NPN4 is as its output Iout1 or Iout2.In Fig. 5, clearly show two output circuits, obviously, can also there is more output circuit.
In sum, in the audio-frequency power amplifier in the utility model, have additional audio frequency input module, do not affecting under the prerequisite of its original performance like this, make it have extra 0dB audio frequency input function.
It is pointed out that being familiar with any change that person skilled in art does embodiment of the present utility model does not all depart from the scope of claims of the present utility model.Correspondingly, the scope of claim of the present utility model is also not limited only to previous embodiment.
Claims (10)
1. an audio-frequency power amplifier, is characterized in that, it comprises:
The first power amplifier unit and the second power amplifier unit, its each power amplifier unit has first input end, the second input and output, wherein the first input end of the first power amplifier unit receives the first audio input signal, the second input is connected with the first input end of the second power amplifier unit by resistance R _ f b, the second input termination of the second power amplifier unit exchanges ground, the output of the first power amplifier unit is connected with its second input through resistance R c, and the output of the second power amplifier unit is connected with its first input end through Ra;
Audio frequency input module, its input receives the second audio input signal, and its output is connected with the second input of the first power amplifier unit,
Wherein said audio frequency input module is converted to current signal by the second audio input signal, and described current signal is inputted to the node of its connection by its output.
2. audio-frequency power amplifier according to claim 1, is characterized in that, when the second audio input signal input audio frequency input module, described audio-frequency power amplifier can be realized 0dB audio frequency input function.
3. audio-frequency power amplifier according to claim 1, is characterized in that, described audio frequency input module comprises biasing circuit and output circuit,
Described biasing circuit provides bias current to described output circuit based on described the second audio input signal,
Described output circuit produces the current signal relevant to the second audio input signal based on described bias current, and exports by its output.
4. audio-frequency power amplifier according to claim 3, is characterized in that,
Described biasing circuit comprises transistor PNP1, transistor NPN1 and resting potential Circuit tuning, and described output circuit comprises transistor PNP2 and transistor NPN2,
Described resting potential Circuit tuning comprises input, the first link and the second link,
The emitter of transistor PNP1 is connected with power end Vcc, and collector electrode is connected with the first link of described resting potential Circuit tuning, and its base stage is connected with the base stage of transistor PNP2,
The grounded emitter of transistor NPN1, collector electrode is connected with the second link of described resting potential Circuit tuning, and its base stage is connected with the base stage of transistor NPN2;
The emitter of transistor PNP2 is connected with power end Vcc, and collector electrode is connected with the collector electrode of transistor NPN2, the grounded emitter of transistor NPN2,
The node that the collector electrode of transistor NPN2 and PNP2 is connected is as the output of described output circuit,
The input of described resting potential Circuit tuning receives described the second audio input signal.
5. audio-frequency power amplifier according to claim 4, it is characterized in that, the emitter area of transistor PNP1 is 1:N with the ratio of the emitter area of transistor PNP2, and the emitter area of transistor NPN1 is 1:N with the ratio of the emitter area of transistor NPN2
The emitter of transistor PNP1 is connected with power end Vcc by resistance R 4, and the emitter of transistor PNP2 is connected with power end Vcc by resistance R 5,
The emitter of transistor NPN2 is connected to the ground by resistance R 6, and the emitter of transistor NPN2 is connected to the ground by resistance R 7,
The resistance ratio of resistance R 4 and R5 is 1:N, and the resistance ratio of resistance R 6 and R7 is 1:N,
The resistance ratio of resistance R 4 and R6 is 1:1, and wherein N is natural number.
6. audio-frequency power amplifier according to claim 4, is characterized in that, described biasing circuit also comprises transistor PNP3 and NPN3,
The emitter of transistor PNP3 connects the base stage of transistor PNP1, and its base stage connects the collector electrode of transistor PNP1, its grounded collector;
The emitter of transistor NPN3 connects the base stage of transistor NPN1, and its base stage connects the collector electrode of transistor NPN1, and its collector electrode meets power end Vcc,
The emitter area of transistor PNP1 is 1:1 with the ratio of the emitter area of transistor PNP3,
The emitter area of transistor NPN1 is 1:1 with the ratio of the emitter area of transistor NPN3.
7. according to the arbitrary described audio-frequency power amplifier of claim 4-6, it is characterized in that, described resting potential Circuit tuning comprises resistance R 1, R2 and R3, and voltage stabilizing didoe Vz,
One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input of described resting potential Circuit tuning, the other end of resistance R 3 is as the second link of described resting potential Circuit tuning, the other end of resistance R 2 is connected with the anode of voltage stabilizing didoe Vz, and the negative electrode of voltage stabilizing didoe Vz is as the first link of described resting potential Circuit tuning.
8. according to the arbitrary described audio-frequency power amplifier of claim 4-6, it is characterized in that, described resting potential Circuit tuning comprises resistance R 1, R2 and R3, and voltage stabilizing didoe Vz,
One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input of described resting potential Circuit tuning, the other end of resistance R 3 is connected with the negative electrode of voltage stabilizing didoe Vz, the anode of voltage stabilizing didoe Vz is as the second link of described resting potential Circuit tuning, and the other end of resistance R 2 is as the first link of described resting potential Circuit tuning.
9. according to the arbitrary described audio-frequency power amplifier of claim 4-6, it is characterized in that, described resting potential Circuit tuning comprises resistance R 1, R2 and R3,
One end interconnection of resistance R 1, R2 and R3, the other end of resistance R 1 is as the input of described resting potential Circuit tuning, the other end of resistance R 3 is as the second link of described resting potential Circuit tuning, and the other end of resistance R 2 is as the first link of described resting potential Circuit tuning.
10. according to the arbitrary described audio-frequency power amplifier of claim 3-6, it is characterized in that, the number of described output circuit is a plurality of, and each output circuit comprises a PNP transistor and the NPN transistor being connected between power end Vcc and ground,
The transistorized emitter of this PNP is connected with power end Vcc, and base stage is connected with the base stage of transistor PNP1, and collector electrode is connected with the collector electrode of this NPN transistor,
The grounded emitter of this NPN transistor, its base stage is connected with the base stage of transistor NPN1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320674515.0U CN203590163U (en) | 2013-10-29 | 2013-10-29 | Audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320674515.0U CN203590163U (en) | 2013-10-29 | 2013-10-29 | Audio power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN203590163U true CN203590163U (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320674515.0U Expired - Lifetime CN203590163U (en) | 2013-10-29 | 2013-10-29 | Audio power amplifier |
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| CN (1) | CN203590163U (en) |
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- 2013-10-29 CN CN201320674515.0U patent/CN203590163U/en not_active Expired - Lifetime
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co.,Ltd. Address before: No.180-22, Linghu Avenue, Taihu International Science and Technology Park, Wuxi, Jiangsu 214135 Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
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Granted publication date: 20140507 |
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