CN109450387A - A kind of integrated operational amplifier circuit for audio player - Google Patents
A kind of integrated operational amplifier circuit for audio player Download PDFInfo
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- CN109450387A CN109450387A CN201811543292.8A CN201811543292A CN109450387A CN 109450387 A CN109450387 A CN 109450387A CN 201811543292 A CN201811543292 A CN 201811543292A CN 109450387 A CN109450387 A CN 109450387A
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- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- -1 T21 form compound Chemical class 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 230000005236 sound signal Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
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Classifications
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- 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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters
-
- 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
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
- H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of integrated operational amplifier circuits for audio player, comprising: differential input stage circuit, for inhibiting temperature drift and as first order amplifying circuit；The quiescent point of circuits at different levels is arranged for providing bias current to circuits at different levels in biasing circuit, including the first Wilson's current source circuit, the second Wilson's current source circuit and third Wilson's current source circuit；Total radio amplifier, the main amplifying circuit as integrated transporting discharging；Quasi- complementary output grade circuit improves carrying load ability for reducing the output signal distortion factor；The differential input stage circuit includes total collection-total radio amplifier, and the total collection-total radio amplifier includes transistor T9~T15, wherein transistor T9, T11 and transistor T10, T12 respectively constitute compound PNP pipe.The present invention can not only make the quiescent point of circuits at different levels mutually indepedent, be independent of each other, and can also effectively reduce the distortion factor of audio signal.
Description
Technical field
The present invention relates to Analogical Circuit Technique field, especially a kind of integrated operational amplifier circuit for audio player.
Background technique
As the improvement of people's living standards, the musical qualities that people export audio player have higher chase after
It asks, the pursuit just because of consumer to high-quality music, so that lossless compressiong is more favored by people, thus using lossless
The source of sound of compression is also more welcomed by the people；And the integrated operational amplifier circuit in existing audio player cannot be very well by audio signal
Amplify, be easy to be distorted in amplification process, thus the quality for audio player it is difficult to ensure that, this is to numerous
The user of audio player brings many puzzlements, therefore needs to research and develop a kind of quiescent point phase that can not only make circuits at different levels
It is mutually independent, it is independent of each other, but also the integrated operational amplifier circuit of the audio player of the distortion factor of audio signal can be effectively reduced.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of integrated operational amplifier circuits for audio player, not only
The quiescent point of circuits at different levels can be made mutually indepedent, be independent of each other, and can also effectively reduce the distortion factor of audio signal.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of integrated operational amplifier circuit for audio player, comprising:
Differential input stage circuit, for inhibiting temperature drift and as first order amplifying circuit；
Biasing circuit, including the first Wilson's current source circuit, the second Wilson's current source circuit and third Wilson's electricity
The quiescent point of circuits at different levels is arranged for providing bias current to circuits at different levels in current source circuit；
Total radio amplifier, the main amplifying circuit as integrated transporting discharging；
Quasi- complementary output grade circuit improves carrying load ability for reducing the output signal distortion factor；
The differential input stage circuit includes total collection-total radio amplifier, and the total collection-total radio amplifier includes crystal
Pipe T9~T15, wherein transistor T9, T11 and transistor T10, T12 respectively constitute compound PNP pipe, and constitute collection amplification altogether
Circuit, transistor T10, T12 constitute total radio amplifier；
The total radio amplifier includes transistor T17, T18, and described transistor T17, T18 form compound NPN pipe；
The quasi- complementary output grade circuit includes UBE multiple circuit and complementary output circuit, and the UBE multiple circuit is available
In eliminating intermodulation distortion and carrying out temperature-compensating, the UBE multiple circuit includes resistance R3, R4 and transistor T19, the complementation
Output circuit includes transistor T20~T23, wherein and described transistor T20, T21 form compound NPN and manage, transistor T22,
T23 forms compound PNP pipe；
The differential input stage circuit is connected with total radio amplifier by resistance coupling method, for believing difference-mode input
Number carry out first order amplification, be then sent to total radio amplifier carry out second level amplification；The total radio amplifier is complementary with standard
Output-stage circuit is connected by resistance coupling method, for amplified signal is undistorted by quasi- complementary output grade circuit
Carry out export, the quasi- complementary output grade circuit is connected with player, for playing out amplified final signal；
The first Wilson's current source circuit is connected with differential input stage circuit, for mentioning to differential input stage circuit
For bias current, the second Wilson's current source circuit is connected with total radio amplifier, for mentioning to total radio amplifier
For bias current, the third Wilson's current source circuit is connected with quasi- complementary output grade circuit, for quasi- complementary output
Grade circuit provides bias current.
Preferably, the base stage of the transistor T9 and collector are connected with the emitter of transistor T11, the transistor
The base stage and collector of T10 is connected with the emitter of transistor T12.
Preferably, the total radio amplifier is connected with the second Wilson's current source circuit by resistance R2, the resistance
R2 is used to convert the variation of collector current to the variation of voltage.
Preferably, the total radio amplifier is connected with quasi- complementary output grade circuit by capacitor C2, so that cascode is put
DC channel between big circuit and quasi- complementary output grade circuit is respectively not communicated with, and guarantees total radio amplifier and quasi- complementary output grade
The quiescent point of circuit is mutually indepedent.
Preferably, the differential input stage circuit is connected with total radio amplifier by capacitor C1, so that cascode amplification electricity
DC channel between road and differential input stage circuit is respectively not communicated with, and guarantees the quiet of total radio amplifier and differential input stage circuit
State operating point is mutually indepedent.
Compared with prior art, the embodiment of the present invention bring it is following the utility model has the advantages that
1, the integrated operational amplifier circuit includes biasing circuit, and biasing circuit includes the first Wilson's current source circuit, the second prestige
Circuits at different levels are arranged for giving circuits at different levels offer bias current in the inferior current source circuit of that and third Wilson's current source circuit
Quiescent point, independent biasing circuit can make the quiescent point of circuits at different levels be independent of each other；Meanwhile biasing circuit is adopted
It can guarantee the highly stable performance of bias currents at different levels with Wilson's current source circuit, and can be bias current by three poles
The influence of pipe amplification factor variation is preferably minimized.
2, the integrated operational amplifier circuit includes differential input stage circuit, and differential input stage circuit includes total collection-cascode amplification electricity
Road, transistor T9, T11 and transistor T10, T12 respectively constitute compound PNP pipe, and constitute common-collector amplifier, by transistor
The multiple tube of composition has very high current amplification factor, while can also reduce the requirement to driving current, moreover, difference is defeated
Common mode input signal can also effectively be inhibited by entering grade circuit, and can effectively reduce the influence of temperature rise.
3, total radio amplifier is connected with quasi- complementary output grade circuit by capacitor C2, so that total radio amplifier and standard
DC channel between complementary output grade circuit is respectively not communicated with, and guarantees the static state of total radio amplifier and quasi- complementary output grade circuit
Operating point is mutually indepedent；Differential input stage circuit is connected with total radio amplifier by capacitor C1 so that total radio amplifier with
DC channel between differential input stage circuit is respectively not communicated with, and guarantees the static work of total radio amplifier and differential input stage circuit
It is mutually indepedent to make point, is independent of each other, effectively reduces the distortion factor of audio signal.
4, the integrated operational amplifier circuit includes quasi- complementary output grade circuit, and quasi- complementary output grade circuit includes UBE multiple circuit
With complementary output circuit, wherein UBE multiple circuit can effectively eliminate intermodulation distortion, while can also carry out a degree of temperature
Degree compensation, complementary output circuit have very strong carrying load ability, and it is symmetrical to export positive and negative direction, two-way to follow, can be undistorted
Audio signal is exported.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the integrated operational amplifier circuit for audio player of the present invention；
Fig. 2 is the circuit diagram of Wilson's current source in a kind of integrated operational amplifier circuit for audio player of the present invention；
Fig. 3 is the circuit diagram of differential input stage circuit in a kind of integrated operational amplifier circuit for audio player of the present invention；
Fig. 4 is the circuit diagram of UBE multiple circuit in a kind of integrated operational amplifier circuit for audio player of the present invention；
Fig. 5 is the circuit diagram of total radio amplifier in a kind of integrated operational amplifier circuit for audio player of the present invention；
Fig. 6 is the circuit of quasi- complementary output grade circuit in a kind of integrated operational amplifier circuit for audio player of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-6 is please referred to, a kind of embodiment provided by the invention: a kind of integrated operational amplifier circuit for audio player,
It include: differential input stage circuit, for inhibiting temperature drift and as first order amplifying circuit；Biasing circuit, including the first Wilson's
Current source circuit, the second Wilson's current source circuit and third Wilson's current source circuit, for providing biasing to circuits at different levels
The quiescent point of circuits at different levels is arranged in electric current；Total radio amplifier, the main amplifying circuit as integrated transporting discharging；It is quasi- complementary
Output-stage circuit improves carrying load ability for reducing the output signal distortion factor；The differential input stage circuit includes total collection-
Total radio amplifier, the total collection-total radio amplifier includes transistor T9~T15, wherein transistor T9, T11 and transistor
T10, T12 respectively constitute compound PNP pipe, and constitute common-collector amplifier, and transistor T10, T12 constitute total radio amplifier；
The total radio amplifier includes transistor T17, T18, and described transistor T17, T18 form compound NPN pipe；It is described quasi- complementary
Output-stage circuit includes UBE multiple circuit and complementary output circuit, the UBE multiple circuit can be used for eliminating intermodulation distortion and into
Trip temperature compensation, the UBE multiple circuit includes resistance R3, R4 and transistor T19, and the complementary output circuit includes transistor
T20~T23, wherein described transistor T20, T21 form compound NPN pipe, and transistor T22, T23 form compound PNP pipe；
The differential input stage circuit is connected with total radio amplifier by resistance coupling method, for differential input signal to be carried out the
Level-one amplification is then sent to total radio amplifier and carries out second level amplification；The total radio amplifier and quasi- complementary output grade electricity
Road is connected by resistance coupling method, for amplified signal is defeated by the distortionless progress of quasi- complementary output grade circuit
Out, the quasi- complementary output grade circuit is connected with player, for playing out amplified final signal；First prestige
You are connected inferior current source circuit with differential input stage circuit, for giving differential input stage circuit offer bias current, described the
Two Wilson's current source circuits are connected with total radio amplifier, for giving total radio amplifier to provide bias current, described the
Three Wilson's current source circuits are connected with quasi- complementary output grade circuit, for providing biased electrical to quasi- complementary output grade circuit
Stream；The base stage and collector of the transistor T9 is connected with the emitter of transistor T11.
The base stage and collector of the transistor T10 is connected with the emitter of transistor T12；The total radio amplifier
It is connected with the second Wilson's current source circuit by resistance R2, the resistance R2 is used to convert electricity for the variation of collector current
The variation of pressure；The total radio amplifier is connected with quasi- complementary output grade circuit by capacitor C2, so that total radio amplifier
DC channel between quasi- complementary output grade circuit is respectively not communicated with, and guarantees total radio amplifier and quasi- complementary output grade circuit
Quiescent point is mutually indepedent；The differential input stage circuit is connected with total radio amplifier by capacitor C1, so that cascode is put
DC channel between big circuit and differential input stage circuit is respectively not communicated with, and guarantees total radio amplifier and differential input stage circuit
Quiescent point it is mutually indepedent.
Working principle: the integrated operational amplifier circuit includes biasing circuit, biasing circuit include the first Wilson's current source circuit,
Second Wilson's current source circuit and third Wilson's current source circuit, for providing bias current to circuits at different levels, setting is each
The quiescent point of grade circuit, independent biasing circuit can make the quiescent point of circuits at different levels be independent of each other；Meanwhile it biasing
Circuit can guarantee the highly stable performance of bias currents at different levels using Wilson's current source circuit, and can be bias current
It is influenced to be preferably minimized by the variation of triode amplification factor；The integrated operational amplifier circuit includes differential input stage circuit, Differential Input
Grade circuit includes total collection-total radio amplifier, and transistor T9, T11 and transistor T10, T12 respectively constitute compound PNP pipe, and
Common-collector amplifier is constituted, the multiple tube being made of transistor has very high current amplification factor, while can also reduce pair
The requirement of driving current moreover, differential input stage circuit can also effectively inhibit common mode input signal, and can effectively reduce temperature
The influence risen；Total radio amplifier is connected with quasi- complementary output grade circuit by capacitor C2, so that total radio amplifier and standard
DC channel between complementary output grade circuit is respectively not communicated with, and guarantees the static state of total radio amplifier and quasi- complementary output grade circuit
Operating point is mutually indepedent；Differential input stage circuit is connected with total radio amplifier by capacitor C1 so that total radio amplifier with
DC channel between differential input stage circuit is respectively not communicated with, and guarantees the static work of total radio amplifier and differential input stage circuit
It is mutually indepedent to make point, is independent of each other, effectively reduces the distortion factor of audio signal；The integrated operational amplifier circuit includes quasi- complementary output
Grade circuit, quasi- complementary output grade circuit includes UBE multiple circuit and complementary output circuit, wherein UBE multiple circuit can effectively disappear
Except intermodulation distortion, while a degree of temperature-compensating can also be carried out, complementary output circuit has very strong carrying load ability,
It is symmetrical to export positive and negative direction, it is two-way to follow, distortionless audio signal can be exported.
As shown in Fig. 2, being the circuit diagram of Wilson's current source circuit, wherein IC6 is output electric current, the c-e series connection of T1 pipe
In the emitter of T6 pipe, since the equivalent resistance between c-e is very big, therefore enable to output electric current IC6 highly stable,
In, transistor T0, T1 are identical with the characteristic of T6, therefore IC1=IC0=IC, then the current equation of A point beSo the collector current of transistor T1
In B point, by the electric current of resistance R1Arrangement can obtainAs β=10, IC6≈0.984IREven if, it is seen then that in amplification factor β very little,
It is also assumed that IC6≈IR, so, output electric current IC6 is influenced very small by base current, guarantees the highly stable of bias current
Property.
As shown in figure 4, being the circuit diagram of UBE multiple circuit, UBE multiple circuit includes resistance R3, R4 and transistor T19,
Wherein, the expression formula of the voltage between the collector and emitter of transistor T19 is
Therefore reasonably select R3 and R4, it can obtain the DC voltage of any multiple of UBE, while also any times of available PN junction
Several temperatures coefficient, therefore can be used for carrying out temperature-compensating.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (5)
1. a kind of integrated operational amplifier circuit for audio player characterized by comprising
Differential input stage circuit, for inhibiting temperature drift and as first order amplifying circuit；
Biasing circuit, including the first Wilson's current source circuit, the second Wilson's current source circuit and third Wilson's current source
The quiescent point of circuits at different levels is arranged for providing bias current to circuits at different levels in circuit；
Total radio amplifier, the main amplifying circuit as integrated transporting discharging；
Quasi- complementary output grade circuit improves carrying load ability for reducing the output signal distortion factor；
The differential input stage circuit includes total collection-total radio amplifier, and the total collection-total radio amplifier includes transistor T9
~T15, wherein transistor T9, T11 and transistor T10, T12 respectively constitute compound PNP pipe, and constitute common-collector amplifier,
Transistor T10, T12 constitute total radio amplifier；
The total radio amplifier includes transistor T17, T18, and described transistor T17, T18 form compound NPN pipe；
The quasi- complementary output grade circuit includes UBE multiple circuit and complementary output circuit, and the UBE multiple circuit can be used for disappearing
Except intermodulation distortion and temperature-compensating is carried out, the UBE multiple circuit includes resistance R3, R4 and transistor T19, the complementary output
Circuit includes transistor T20~T23, wherein described transistor T20, T21 form compound NPN pipe, transistor T22, T23 group
At compound PNP pipe；
The differential input stage circuit is connected with total radio amplifier by resistance coupling method, for by differential input signal into
The amplification of the row first order is then sent to total radio amplifier and carries out second level amplification；The total radio amplifier and quasi- complementary output
Grade circuit be connected by resistance coupling method, for by amplified signal by quasi- complementary output grade circuit it is distortionless into
Row output, the quasi- complementary output grade circuit is connected with player, for playing out amplified final signal；
The first Wilson's current source circuit is connected with differential input stage circuit, inclined for providing to differential input stage circuit
Electric current is set, the second Wilson's current source circuit is connected with total radio amplifier, inclined for providing to total radio amplifier
Electric current is set, the third Wilson's current source circuit is connected with quasi- complementary output grade circuit, for quasi- complementary output grade electricity
Road provides bias current.
2. a kind of integrated operational amplifier circuit for audio player according to claim 1, which is characterized in that the crystal
The base stage and collector of pipe T9 is connected with the emitter of transistor T11, the base stage and collector of the transistor T10 with crystalline substance
The emitter of body pipe T12 is connected.
3. a kind of integrated operational amplifier circuit for audio player according to claim 1, which is characterized in that the cascode
Amplifying circuit is connected with the second Wilson's current source circuit by resistance R2, and the resistance R2 is used for the variation of collector current
It is converted into the variation of voltage.
4. a kind of integrated operational amplifier circuit for audio player according to claim 1, which is characterized in that the cascode
Amplifying circuit is connected with quasi- complementary output grade circuit by capacitor C2, so that total radio amplifier and quasi- complementary output grade circuit
Between DC channel be respectively not communicated with, guarantee total radio amplifier and quasi- complementary output grade circuit quiescent point it is mutually only
It is vertical.
5. a kind of integrated operational amplifier circuit for audio player according to claim 1, which is characterized in that the difference
Input stage circuit is connected with total radio amplifier by capacitor C1, so that between total radio amplifier and differential input stage circuit
DC channel is respectively not communicated with, and guarantees that the quiescent point of total radio amplifier and differential input stage circuit is mutually indepedent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543292.8A CN109450387B (en) | 2018-12-17 | 2018-12-17 | Integrated operational amplifier circuit for audio player |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811543292.8A CN109450387B (en) | 2018-12-17 | 2018-12-17 | Integrated operational amplifier circuit for audio player |
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| CN109450387A true CN109450387A (en) | 2019-03-08 |
| CN109450387B CN109450387B (en) | 2023-10-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368680A (en) * | 2011-09-30 | 2012-03-07 | 烽火通信科技股份有限公司 | Current feedback operational amplifier circuit |
| US20130265020A1 (en) * | 2012-04-06 | 2013-10-10 | Dialog Semiconductor Gmbh | Output Transistor Leakage Compensation for Ultra Low-Power LDO Regulator |
| CN204615772U (en) * | 2015-03-30 | 2015-09-02 | 深圳市锐骏半导体有限公司 | A kind of audio power amplifying circuit |
| CN108377137A (en) * | 2018-05-07 | 2018-08-07 | 贵州大学 | A kind of high-power integrated operational amplifier |
| CN209201020U (en) * | 2018-12-17 | 2019-08-02 | 天津三源兴泰微电子技术有限公司 | A kind of integrated operational amplifier circuit for audio player |
-
2018
- 2018-12-17 CN CN201811543292.8A patent/CN109450387B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368680A (en) * | 2011-09-30 | 2012-03-07 | 烽火通信科技股份有限公司 | Current feedback operational amplifier circuit |
| US20130265020A1 (en) * | 2012-04-06 | 2013-10-10 | Dialog Semiconductor Gmbh | Output Transistor Leakage Compensation for Ultra Low-Power LDO Regulator |
| CN204615772U (en) * | 2015-03-30 | 2015-09-02 | 深圳市锐骏半导体有限公司 | A kind of audio power amplifying circuit |
| CN108377137A (en) * | 2018-05-07 | 2018-08-07 | 贵州大学 | A kind of high-power integrated operational amplifier |
| CN209201020U (en) * | 2018-12-17 | 2019-08-02 | 天津三源兴泰微电子技术有限公司 | A kind of integrated operational amplifier circuit for audio player |
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| CN109450387B (en) | 2023-10-13 |
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