CN220915261U - Audio amplifier based on current mirror circuit - Google Patents
Audio amplifier based on current mirror circuit Download PDFInfo
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- CN220915261U CN220915261U CN202322553353.1U CN202322553353U CN220915261U CN 220915261 U CN220915261 U CN 220915261U CN 202322553353 U CN202322553353 U CN 202322553353U CN 220915261 U CN220915261 U CN 220915261U
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Abstract
The utility model discloses an audio amplifier based on a current mirror circuit, which comprises a positive power supply, a negative power supply, a positive balanced differential signal end, a negative balanced differential signal end, a signal conversion input circuit, a first Williamson current mirror circuit, a second Williamson current mirror circuit, a third Williamson current mirror circuit, a signal conversion output circuit and a signal output end, wherein the positive balanced differential signal end is connected with the positive power supply; the utility model adopts a current mirror circuit architecture, can transmit the audio signal output by the front end to the output end without damage, can directly convert the audio signal into a large enough voltage signal by using the grounding resistance of the output end without gain amplification, realizes low-distortion and high-signal-to-noise ratio signals, and can directly control the volume by adopting a potentiometer or a numerical control resistor.
Description
Technical Field
The utility model relates to the technical field of amplifying circuits, in particular to an audio amplifier based on a current mirror circuit.
Background
Currently, when audio is to be amplified, the following method is generally adopted:
1) The feedback voltage amplification has the following disadvantages: the device is composed of discrete devices or operational amplifier chips, and the transparency and transient response of sound quality are poor due to the fact that a feedback mode of resistors and capacitors connected in parallel is used and the capacity of the capacitors is large, so that the imaging and resolving power of sound is naturally reduced, and speed change in music cannot be accurately represented;
2) Multistage amplification, which has the following disadvantages: the conventional amplifier architecture comprises a front-stage amplification, volume control, buffering, current amplification and earphone (or sound box) driving, and has the advantages of high cost, high noise and serious sound pollution;
3) The special chip for volume control is expensive and has high noise.
Disclosure of utility model
Accordingly, a primary object of the present utility model is to provide an audio amplifier based on a current mirror circuit.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
The embodiment of the utility model provides an audio amplifier based on a current mirror circuit, which comprises a positive power supply, a negative power supply, a positive balanced differential signal end, a negative balanced differential signal end, a first constant current source circuit, a second constant current source circuit, a signal conversion input circuit, a first Williamson current mirror circuit, a second Williamson current mirror circuit, a third Williamson current mirror circuit, a signal conversion output circuit and a signal output end, wherein the positive power supply and the negative power supply are respectively connected with the input ends of the first constant current source circuit, the second constant current source circuit, the first Williamson current mirror circuit and the second Williamson current mirror circuit, the output ends of the first constant current source circuit and the second constant current source circuit are respectively connected with the third Williamson current mirror circuit, the positive balanced differential signal end and the negative balanced differential signal end are respectively connected with the input end of the third Williamson current mirror circuit, the signal conversion input circuit is connected with the positive balanced differential signal end, the signal conversion input circuit is used for converting an electric signal into a current signal, the third Williamson current mirror circuit is respectively connected with the first Williamson current mirror circuit and the second Williamson current mirror circuit, and the signal conversion output circuit is used for converting the signal to be connected with the current and the signal conversion circuit.
In the above scheme, the third wilson current mirror circuit includes a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode, wherein an emitter of the ninth triode is connected with an emitter of the eleventh triode at a negative electrode balanced differential signal end, respectively, a base of the ninth triode is connected with a base of the thirteenth triode, an emitter of the tenth triode is connected with an emitter of the twelfth triode at a positive electrode balanced differential signal end, respectively, and a base of the twelfth triode is connected with a base of the eleventh triode.
In the above scheme, the signal conversion balanced input circuit comprises a first resistor, a positive end signal input source and a negative end signal input source, wherein a first end of the first resistor is connected with the positive end balanced differential signal end, and a second end of the first resistor is connected with the positive end signal input source; the first end of the negative terminal signal input source is connected with the negative electrode balance differential signal end.
In the above scheme, the first Williamson current mirror circuit comprises a first triode, a second triode, a third triode and a fourth triode, wherein the emitter of the first triode is respectively connected with the emitter of the second triode and a positive power supply, the base of the first triode is respectively connected with the base of the second triode, the collector of the second triode and the emitter of the fourth triode, the collector of the first triode is respectively connected with the emitter of the third triode, and the base of the third triode is respectively connected with the collector of the third triode, the collector of the eleventh triode and the base of the fourth triode.
In the above scheme, the second wilson current mirror circuit includes a fifth triode, a sixth triode, a seventh triode and an eighth triode, wherein the emitter of the eighth triode is connected with the emitter of the sixth triode and the negative power supply respectively, the base of the eighth triode is connected with the base of the sixth triode, the collector of the eighth triode and the emitter of the seventh triode respectively, the collector of the sixth triode is connected with the emitter of the fifth triode respectively, and the base of the fifth triode is connected with the collector of the fifth triode, the collector of the ninth triode and the base of the seventh triode respectively.
In the above scheme, the first constant current source circuit comprises a first constant current source load, and the collector of the twelfth triode is connected with the positive power supply after being connected with the first constant current source load in series.
In the above scheme, the second constant current source circuit comprises a second constant current source load, and the collector of the tenth triode is connected with the negative power supply after being connected with the second constant current source load in series.
In the above scheme, the signal conversion output circuit includes a second resistor, a first end of the second resistor is connected with the collector of the fourth triode, the collector of the seventh triode and the signal output end, and a second end of the second resistor is grounded.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model adopts a current mirror circuit architecture, can transmit the audio signal output by the front end to the output end without damage, can directly convert the grounding resistance of the output end into a voltage signal with enough magnitude without gain amplification, realizes the signals with low distortion and high signal-to-noise ratio, and can directly control the volume by adopting a potentiometer or a numerical control resistor .
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
Fig. 1 is a schematic diagram of an audio amplifier based on a current mirror circuit according to an embodiment of the utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present utility model, it should be understood that the terms "first," "second," "third," etc. are merely for convenience in distinguishing and describing identical components, and are not intended to indicate or imply the number of components referred to, but are not to be construed as limiting the present patent, so that a person of ordinary skill in the art would understand the specific meaning of the terms as the case may be.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or apparatus that comprises the element.
The embodiment of the utility model provides an audio amplifier based on a current mirror circuit, which is shown in fig. 1, and comprises a positive power supply V+, a negative power supply V-, a positive balanced differential signal end I N +, a negative balanced differential signal end I N-, a first constant current source circuit, a second constant current source circuit, a signal conversion input circuit, a first Williamson current mirror circuit, a second Williamson current mirror circuit, a third Williamson current mirror circuit, a signal conversion output circuit and a signal output end OUT, wherein the positive power supply V+ and the negative power supply V-are respectively connected with the input ends of the first constant current source circuit, the second constant current source circuit, the first Williamson current mirror circuit and the second Williamson current mirror circuit, the output ends of the first constant current source circuit and the second constant current source circuit are respectively connected with the input end of the third Williamson current mirror circuit, the positive balanced differential signal end I N + and the negative balanced differential signal end I N-are respectively connected with the input end of the third Williamson current mirror circuit, the signal conversion input circuit is connected with the positive balanced differential signal end I N + for converting an electric signal into a current signal, and the output end of the signal is respectively connected with the second Williamson current mirror circuit in parallel.
As shown in fig. 1, the third wilson current mirror circuit includes a ninth triode Q9, a tenth triode Q10, an eleventh triode Q11, and a twelfth triode Q12, where emitters of the ninth triode Q9 are respectively connected to the negative balanced differential signal terminal I N and emitters of the eleventh triode Q11, a base of the ninth triode Q9 is connected to a base of the thirteenth triode Q10, emitters of the thirteenth triode Q10 are respectively connected to the positive balanced differential signal terminal I N + and emitters of the twelfth triode Q12, and a base of the twelfth triode Q12 is connected to a base of the eleventh triode Q11.
As shown in fig. 1, the signal conversion balanced input circuit includes a first resistor R1, a positive-side signal input source V1, and a negative-side signal input source V2, wherein a first end of the first resistor R1 is connected to the positive-side balanced differential signal terminal I N +, a second end of the first resistor R1 is connected to the positive-side signal input source V1, and a first end of the negative-side signal input source V2 is connected to the negative-side balanced differential signal terminal I N-.
As shown in fig. 1, the first wilson current mirror circuit includes a first triode Q1, a second triode Q2, a third triode Q3, and a fourth triode Q4, where an emitter of the first triode Q1 is connected with an emitter of the second triode Q2 and a positive power supply v+ respectively, a base of the first triode Q1 is connected with a base of the second triode Q2, a collector of the second triode Q2, and an emitter of the fourth triode Q4 respectively, a collector of the first triode Q1 is connected with an emitter of the third triode Q3 respectively, and a base of the third triode Q3 is connected with a collector of the third triode Q3, a collector of the eleventh triode Q11, and a base of the fourth triode Q4 respectively.
As shown in fig. 1, the second wilson current mirror circuit includes a fifth triode Q5, a sixth triode Q6, a seventh triode Q7, and an eighth triode Q8, where an emitter of the eighth triode Q8 is connected with an emitter of the sixth triode Q6 and a negative power supply V-, a base of the eighth triode Q8 is connected with a base of the sixth triode Q6, a collector of the eighth triode Q8, and an emitter of the seventh triode Q7, a collector of the sixth triode Q6 is connected with an emitter of the fifth triode Q5, and a base of the fifth triode Q5 is connected with a collector of the fifth triode Q5, a collector of the ninth triode Q9, and a base of the seventh triode Q7.
As shown in fig. 1, the first constant current source circuit includes a first constant current source load I1, and the collector of the twelfth triode Q12 is connected in series with the first constant current source load I1 and then connected to the positive power supply v+.
As shown in fig. 1, the second constant current source circuit includes a second constant current source load I2, and the collector of the thirteenth diode Q10 is connected in series with the second constant current source load I2 and then connected to the negative power supply V-.
As shown in fig. 1, the signal conversion output circuit includes a second resistor R2, a first end of the second resistor R2 is connected to the collector of the fourth transistor Q4, the collector of the seventh transistor Q7, and the signal output terminal OUT, and a second end of the second resistor R2 is grounded.
The working principle of the utility model is as follows:
As shown in fig. 1, the circuit is composed of a plurality of wilson current mirror circuits, the wilson current mirror circuits adopt the same type of transistors, and when the beta value is paired, the currents flowing through the four transistors are the same; when the beta value of the triode is 300, the current error of each triode is as low as 0.003%, the current error can be ignored, and the precision can be further improved by selecting a transistor with a higher beta value.
The input stage of the signal consists of a complementary Wilson current mirror circuit, namely balanced input can be realized, and a balanced differential signal is connected with an anode balanced differential signal end I N + or a cathode balanced differential signal end IN-; the input signal is connected with the positive electrode balance differential signal end IN+, the negative electrode balance differential signal end IN-is directly grounded, the input signal is changed into current through the first resistor R1, the balance error of base current is eliminated by utilizing a Williamson current mirror, the input current is mirrored to the output end IN the same size, and the circuit has very high output impedance due to the negative feedback of the fourth triode Q4 and the seventh triode Q7 of constant current sources of the second triode Q2 and the eighth triode Q8, and the output current source is converted into voltage signal output through the second resistor R2.
Therefore, the audio signal output by the front end can be transmitted to the output end in a lossless manner by adopting a current mirror circuit architecture, the ground resistance of the output end can be directly converted into a large enough voltage signal without gain amplification, the signals with low distortion and high signal to noise ratio are realized, and meanwhile, the volume of the ground resistance of the output end can be directly controlled by adopting a potentiometer or a numerical control resistor.
The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model.
Claims (8)
1. The audio amplifier based on the current mirror circuit is characterized by comprising a positive power supply, a negative power supply, a positive balanced differential signal end, a negative balanced differential signal end, a first constant current source circuit, a second constant current source circuit, a signal conversion input circuit, a first Williamson current mirror circuit, a second Williamson current mirror circuit, a third Williamson current mirror circuit, a signal conversion output circuit and a signal output end, wherein the positive power supply and the negative power supply are respectively connected with the input ends of the first constant current source circuit, the second constant current source circuit, the first Williamson current mirror circuit and the second Williamson current mirror circuit, the output ends of the first constant current source circuit and the second constant current source circuit are respectively connected with the third Williamson current mirror circuit, the positive balanced differential signal end and the negative balanced differential signal end are respectively connected with the input end of the third Williamson current mirror circuit, the signal conversion input circuit is connected with the positive balanced differential signal end, the signal conversion input circuit is used for converting an electric signal into a current signal, the third Williamson current mirror circuit is respectively connected with the first Williamson current mirror circuit and the second Williamson current mirror circuit in parallel with the second Williamson current conversion output circuit, and the signal conversion output circuit is used for converting the signal into a voltage signal.
2. The audio amplifier based on the current mirror circuit according to claim 1, wherein the third wilson current mirror circuit comprises a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode, wherein an emitter of the ninth triode is respectively connected with a negative balanced differential signal terminal and an emitter of the eleventh triode, a base of the ninth triode is connected with a base of the thirteenth triode, an emitter of the tenth triode is respectively connected with a positive balanced differential signal terminal and an emitter of the twelfth triode, and a base of the twelfth triode is connected with a base of the eleventh triode.
3. The current mirror circuit-based audio amplifier of claim 2, wherein the signal conversion balanced input circuit comprises a first resistor, a positive side signal input source, and a negative side signal input source, a first end of the first resistor being connected to the positive side balanced differential signal terminal, a second end of the first resistor being connected to the positive side signal input source, and a first end of the negative side signal input source being connected to the negative side balanced differential signal terminal.
4. The audio amplifier based on the current mirror circuit according to claim 3, wherein the first wilson current mirror circuit comprises a first triode, a second triode, a third triode and a fourth triode, the emitter of the first triode is respectively connected with the emitter of the second triode and a positive power supply, the base of the first triode is respectively connected with the base of the second triode, the collector of the second triode and the emitter of the fourth triode, the collector of the first triode is respectively connected with the emitter of the third triode, and the base of the third triode is respectively connected with the collector of the third triode, the collector of the eleventh triode and the base of the fourth triode.
5. The audio amplifier based on the current mirror circuit according to claim 4, wherein the second wilson current mirror circuit comprises a fifth triode, a sixth triode, a seventh triode and an eighth triode, wherein an emitter of the eighth triode is respectively connected with an emitter of the sixth triode and a negative power supply, a base of the eighth triode is respectively connected with a base of the sixth triode, a collector of the eighth triode and an emitter of the seventh triode, a collector of the sixth triode is respectively connected with an emitter of the fifth triode, and a base of the fifth triode is respectively connected with a collector of the fifth triode, a collector of the ninth triode and a base of the seventh triode.
6. The audio amplifier of claim 5, wherein the first constant current source circuit comprises a first constant current source load, and wherein the collector of the twelfth transistor is connected in series with the first constant current source load and then connected to the positive power supply.
7. The audio amplifier of claim 6, wherein the second constant current source circuit comprises a second constant current source load, and wherein the collector of the tenth triode is connected in series with the second constant current source load and then connected to a negative power supply.
8. The audio amplifier of claim 7, wherein the signal conversion output circuit comprises a second resistor, a first end of the second resistor is connected to the collector of the fourth triode, the collector of the seventh triode and the signal output terminal, respectively, and a second end of the second resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322553353.1U CN220915261U (en) | 2023-09-20 | 2023-09-20 | Audio amplifier based on current mirror circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322553353.1U CN220915261U (en) | 2023-09-20 | 2023-09-20 | Audio amplifier based on current mirror circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220915261U true CN220915261U (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322553353.1U Active CN220915261U (en) | 2023-09-20 | 2023-09-20 | Audio amplifier based on current mirror circuit |
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| CN (1) | CN220915261U (en) |
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2023
- 2023-09-20 CN CN202322553353.1U patent/CN220915261U/en active Active
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