CN109450387B - Integrated operational amplifier circuit for audio player - Google Patents
Integrated operational amplifier circuit for audio player Download PDFInfo
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- CN109450387B CN109450387B CN201811543292.8A CN201811543292A CN109450387B CN 109450387 B CN109450387 B CN 109450387B CN 201811543292 A CN201811543292 A CN 201811543292A CN 109450387 B CN109450387 B CN 109450387B
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- 230000003321 amplification Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 abstract description 8
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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 an integrated operational amplifier circuit for an audio player, which comprises: the differential input stage circuit is used for inhibiting temperature drift and is used as a first-stage amplifying circuit; the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit, and is used for providing bias current for each stage of circuit and setting a static working point of each stage of circuit; the common-emission amplifying circuit is used as a main amplifying circuit of the integrated operational amplifier; the quasi-complementary output stage circuit is used for reducing the distortion degree of output signals and improving the load capacity; the differential input stage circuit comprises a common-set-common-emitter amplifying circuit, and the common-set-common-emitter amplifying circuit comprises transistors T9-T15, wherein the transistors T9 and T11 and the transistors T10 and T12 respectively form a composite PNP tube. The invention not only can make the static working points of all stages of circuits mutually independent and not mutually influenced, but also can effectively reduce the distortion degree of the audio signal.
Description
Technical Field
The invention relates to the technical field of analog circuits, in particular to an integrated operational amplifier circuit for an audio player.
Background
With the improvement of the living standard of people, people have a higher pursuit for the quality of music output by an audio player, and the lossless compression technology is favored by people due to the pursuit of consumers for high-quality music, so that the sound source adopting lossless compression is popular with people; the integrated operational amplifier circuit in the existing audio player cannot amplify the audio signal well, distortion is easy to occur in the amplifying process, so that the quality of the audio player is difficult to ensure, a lot of trouble is brought to users of a plurality of audio players, and therefore, the integrated operational amplifier circuit of the audio player is required to be developed, not only can static working points of all stages of circuits be independent of each other and are not influenced, but also the distortion degree of the audio signal can be effectively reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the integrated operational amplifier circuit for the audio player, which not only can enable the static working points of all stages of circuits to be independent of each other and not to be affected by each other, but also can effectively reduce the distortion degree of audio signals.
The invention solves the technical problems by adopting the following technical scheme:
an integrated op-amp circuit for an audio player, comprising:
the differential input stage circuit is used for inhibiting temperature drift and is used as a first-stage amplifying circuit;
the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit, and is used for providing bias current for each stage of circuit and setting a static working point of each stage of circuit;
the common-emission amplifying circuit is used as a main amplifying circuit of the integrated operational amplifier;
the quasi-complementary output stage circuit is used for reducing the distortion degree of output signals and improving the load capacity;
the differential input stage circuit comprises a common-set-common-emission amplifying circuit, wherein the common-set-common-emission amplifying circuit comprises transistors T9-T15, transistors T9 and T11 and transistors T10 and T12 respectively form a composite PNP tube and form a common-set amplifying circuit, and transistors T10 and T12 form a common-emission amplifying circuit;
the common-emission amplifying circuit comprises transistors T17 and T18, wherein the transistors T17 and T18 form a composite NPN tube;
the quasi-complementary output stage circuit comprises a UBE multiplication circuit and a complementary output circuit, wherein the UBE multiplication circuit can be used for eliminating crossover distortion and performing temperature compensation, the UBE multiplication circuit comprises resistors R3 and R4 and a transistor T19, the complementary output circuit comprises transistors T20-T23, the transistors T20 and T21 form a composite NPN tube, and the transistors T22 and T23 form a composite PNP tube;
the differential input stage circuit is connected with the common-emission amplifying circuit in a resistance-capacitance coupling mode and is used for carrying out first-stage amplification on a differential mode input signal, and then the differential input stage circuit is sent to the common-emission amplifying circuit for carrying out second-stage amplification; the common-emission amplifying circuit is connected with the quasi-complementary output stage circuit in a resistance-capacitance coupling mode and is used for outputting the amplified signal through the quasi-complementary output stage circuit without distortion, and the quasi-complementary output stage circuit is connected with the player and is used for playing the amplified final signal;
the first Wilson current source circuit is connected with the differential input stage circuit and used for providing bias current for the differential input stage circuit, the second Wilson current source circuit is connected with the common-emitter amplifying circuit and used for providing bias current for the common-emitter amplifying circuit, and the third Wilson current source circuit is connected with the quasi-complementary output stage circuit and used for providing bias current for the quasi-complementary output stage circuit.
Preferably, the base and collector of the transistor T9 are both connected to the emitter of the transistor T11, and the base and collector of the transistor T10 are both connected to the emitter of the transistor T12.
Preferably, the cascode circuit is connected to the second wilson current source circuit through a resistor R2, and the resistor R2 is used to convert the change of the collector current into the change of the voltage.
Preferably, the common-mode amplifying circuit is connected with the quasi-complementary output stage circuit through a capacitor C2, so that direct current paths between the common-mode amplifying circuit and the quasi-complementary output stage circuit are not communicated, and static working points of the common-mode amplifying circuit and the quasi-complementary output stage circuit are ensured to be independent.
Preferably, the differential input stage circuit is connected with the common-mode amplifying circuit through a capacitor C1, so that direct current paths between the common-mode amplifying circuit and the differential input stage circuit are not communicated, and static working points of the common-mode amplifying circuit and the differential input stage circuit are ensured to be independent.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
1. the integrated operational amplifier circuit comprises a bias circuit, wherein the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit and is used for providing bias current for each stage of circuit, setting the static working points of each stage of circuit and enabling the static working points of each stage of circuit not to be affected by each other by the independent bias circuit; meanwhile, the bias circuit adopts the Wilson current source circuit, so that the high stability of bias current of each stage can be ensured, and the influence of the bias current caused by the change of the amplification factor of the triode can be minimized.
2. The integrated operational amplifier circuit comprises a differential input stage circuit, wherein the differential input stage circuit comprises a common-mode-common-mode amplifying circuit, transistors T9 and T11 and transistors T10 and T12 respectively form a composite PNP tube and a common-mode amplifying circuit, the composite tube formed by the transistors has high current amplification factor, and meanwhile, the requirement on driving current can be reduced.
3. The common-injection amplifying circuit is connected with the quasi-complementary output stage circuit through a capacitor C2, so that direct current paths between the common-injection amplifying circuit and the quasi-complementary output stage circuit are not communicated, and the mutual independence of static working points of the common-injection amplifying circuit and the quasi-complementary output stage circuit is ensured; the differential input stage circuit and the common-mode amplifying circuit are connected through the capacitor C1, so that direct current paths between the common-mode amplifying circuit and the differential input stage circuit are not communicated, static working points of the common-mode amplifying circuit and the differential input stage circuit are ensured to be independent of each other, the static working points are not influenced, and the distortion degree of audio signals is effectively reduced.
4. The integrated operational amplifier circuit comprises a quasi-complementary output stage circuit, wherein the quasi-complementary output stage circuit comprises a UBE multiplication circuit and a complementary output circuit, the UBE multiplication circuit can effectively eliminate crossover distortion, meanwhile, temperature compensation can be carried out to a certain extent, the complementary output circuit has strong load capacity, the output positive direction and the output negative direction are symmetrical, the output positive direction and the output negative direction are both-way following, and an audio signal can be output without distortion.
Drawings
FIG. 1 is a circuit diagram of an integrated op-amp circuit for an audio player according to the present invention;
FIG. 2 is a circuit diagram of a Wilson current source in an integrated op-amp circuit for an audio player in accordance with the present invention;
FIG. 3 is a circuit diagram of a differential input stage circuit in an integrated op-amp circuit for an audio player in accordance with the present invention;
FIG. 4 is a circuit diagram of a UBE multiplication circuit in an integrated op-amp circuit for an audio player according to the present invention;
FIG. 5 is a circuit diagram of a common-mode amplifier circuit of an integrated operational amplifier circuit for an audio player according to the present invention;
fig. 6 is a circuit diagram of a quasi-complementary output stage circuit in an integrated op-amp circuit for an audio player according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, an embodiment of the present invention is provided: an integrated op-amp circuit for an audio player, comprising: the differential input stage circuit is used for inhibiting temperature drift and is used as a first-stage amplifying circuit; the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit, and is used for providing bias current for each stage of circuit and setting a static working point of each stage of circuit; the common-emission amplifying circuit is used as a main amplifying circuit of the integrated operational amplifier; the quasi-complementary output stage circuit is used for reducing the distortion degree of output signals and improving the load capacity; the differential input stage circuit comprises a common-set-common-emission amplifying circuit, wherein the common-set-common-emission amplifying circuit comprises transistors T9-T15, transistors T9 and T11 and transistors T10 and T12 respectively form a composite PNP tube and form a common-set amplifying circuit, and transistors T10 and T12 form a common-emission amplifying circuit; the common-emission amplifying circuit comprises transistors T17 and T18, wherein the transistors T17 and T18 form a composite NPN tube; the quasi-complementary output stage circuit comprises a UBE multiplication circuit and a complementary output circuit, wherein the UBE multiplication circuit can be used for eliminating crossover distortion and performing temperature compensation, the UBE multiplication circuit comprises resistors R3 and R4 and a transistor T19, the complementary output circuit comprises transistors T20-T23, the transistors T20 and T21 form a composite NPN tube, and the transistors T22 and T23 form a composite PNP tube; the differential input stage circuit is connected with the common-emission amplifying circuit in a resistance-capacitance coupling mode and is used for carrying out first-stage amplification on a differential mode input signal, and then the differential input stage circuit is sent to the common-emission amplifying circuit for carrying out second-stage amplification; the common-emission amplifying circuit is connected with the quasi-complementary output stage circuit in a resistance-capacitance coupling mode and is used for outputting the amplified signal through the quasi-complementary output stage circuit without distortion, and the quasi-complementary output stage circuit is connected with the player and is used for playing the amplified final signal; the first Wilson current source circuit is connected with the differential input stage circuit and used for providing bias current for the differential input stage circuit, the second Wilson current source circuit is connected with the common-emitter amplifying circuit and used for providing bias current for the common-emitter amplifying circuit, and the third Wilson current source circuit is connected with the quasi-complementary output stage circuit and used for providing bias current for the quasi-complementary output stage circuit; the base and collector of the transistor T9 are connected to the emitter of the transistor T11.
The base electrode and the collector electrode of the transistor T10 are connected with the emitter electrode of the transistor T12; the common-emission amplifying circuit is connected with the second Wilson current source circuit through a resistor R2, and the resistor R2 is used for converting the change of collector current into the change of voltage; the common-injection amplifying circuit is connected with the quasi-complementary output stage circuit through a capacitor C2, so that direct current paths between the common-injection amplifying circuit and the quasi-complementary output stage circuit are not communicated, and the static working points of the common-injection amplifying circuit and the quasi-complementary output stage circuit are ensured to be independent; the differential input stage circuit and the common-emission amplifying circuit are connected through a capacitor C1, so that direct current paths between the common-emission amplifying circuit and the differential input stage circuit are not communicated, and the static working points of the common-emission amplifying circuit and the differential input stage circuit are independent of each other.
Working principle: the integrated operational amplifier circuit comprises a bias circuit, wherein the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit and is used for providing bias current for each stage of circuit, setting the static working points of each stage of circuit and enabling the static working points of each stage of circuit not to be affected by each other by the independent bias circuit; meanwhile, the bias circuit adopts the Wilson current source circuit, so that the high stability of bias current of each stage can be ensured, and the influence of the bias current on the amplification factor change of the triode can be reduced to the minimum; the integrated operational amplifier circuit comprises a differential input stage circuit, wherein the differential input stage circuit comprises a common-mode-common-emission amplifying circuit, transistors T9 and T11 and transistors T10 and T12 respectively form a composite PNP tube and a common-mode amplifying circuit, the composite tube formed by the transistors has high current amplification factor, and meanwhile, the requirement on driving current can be reduced; the common-injection amplifying circuit is connected with the quasi-complementary output stage circuit through a capacitor C2, so that direct current paths between the common-injection amplifying circuit and the quasi-complementary output stage circuit are not communicated, and the mutual independence of static working points of the common-injection amplifying circuit and the quasi-complementary output stage circuit is ensured; the differential input stage circuit and the common-emission amplifying circuit are connected through the capacitor C1, so that direct current paths between the common-emission amplifying circuit and the differential input stage circuit are not communicated, static working points of the common-emission amplifying circuit and the differential input stage circuit are ensured to be independent of each other, the static working points are not influenced by each other, and the distortion degree of audio signals is effectively reduced; the integrated operational amplifier circuit comprises a quasi-complementary output stage circuit, wherein the quasi-complementary output stage circuit comprises a UBE multiplication circuit and a complementary output circuit, the UBE multiplication circuit can effectively eliminate crossover distortion, meanwhile, temperature compensation can be carried out to a certain extent, the complementary output circuit has strong load capacity, the output positive direction and the output negative direction are symmetrical, the output positive direction and the output negative direction are both-way following, and an audio signal can be output without distortion.
As shown in fig. 2, a circuit diagram of a wilson current source circuit, wherein,IC6 is output current, c-e of T1 tube is connected in series with emitter of T6 tube, and due to its very large equivalent resistance, the output current IC6 can be made highly stable, in which the characteristics of transistors T0, T1 and T6 are identical, so that I C1 ＝I C0 ＝I C The current equation at point A isCollector current of transistor T1 +>At point B, the current through resistor R1 +.>Can be arranged to obtainWhen β=10, I C6 ≈0.984I R It can be seen that even when the magnification β is small, I can be considered as C6 ≈I R Therefore, the output current IC6 is very little affected by the base current, ensuring a high stability of the bias current.
As shown in fig. 4, a circuit diagram of a UBE multiplication circuit is shown, the UBE multiplication circuit comprises resistors R3, R4 and a transistor T19, wherein the expression of the voltage between the collector and the emitter of the transistor T19 is thatTherefore, R3 and R4 are reasonably selected, so that direct current voltage with any multiple of UBE can be obtained, and meanwhile, temperature coefficient with any multiple of PN junction can be obtained, and the method can be used for temperature compensation.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. An integrated op-amp circuit for an audio player, comprising:
the differential input stage circuit is used for inhibiting temperature drift and is used as a first-stage amplifying circuit;
the bias circuit comprises a first Wilson current source circuit, a second Wilson current source circuit and a third Wilson current source circuit, and is used for providing bias current for each stage of circuit and setting a static working point of each stage of circuit;
the common-emission amplifying circuit is used as a main amplifying circuit of the integrated operational amplifier;
the quasi-complementary output stage circuit is used for reducing the distortion degree of output signals and improving the load capacity;
the differential input stage circuit comprises a common-set-common-emission amplifying circuit, wherein the common-set-common-emission amplifying circuit comprises transistors T9-T15, transistors T9 and T11 and transistors T10 and T12 respectively form a composite PNP tube and form a common-set amplifying circuit, and transistors T10 and T12 form a common-emission amplifying circuit;
the common-emission amplifying circuit comprises transistors T17 and T18, wherein the transistors T17 and T18 form a composite NPN tube;
the quasi-complementary output stage circuit comprises a UBE multiplication circuit and a complementary output circuit, wherein the UBE multiplication circuit can be used for eliminating crossover distortion and performing temperature compensation, the UBE multiplication circuit comprises resistors R3 and R4 and a transistor T19, the complementary output circuit comprises transistors T20-T23, the transistors T20 and T21 form a composite NPN tube, and the transistors T22 and T23 form a composite PNP tube;
the differential input stage circuit is connected with the common-emission amplifying circuit in a resistance-capacitance coupling mode and is used for carrying out first-stage amplification on a differential mode input signal, and then the differential input stage circuit is sent to the common-emission amplifying circuit for carrying out second-stage amplification; the common-emission amplifying circuit is connected with the quasi-complementary output stage circuit in a resistance-capacitance coupling mode and is used for outputting the amplified signal through the quasi-complementary output stage circuit without distortion, and the quasi-complementary output stage circuit is connected with the player and is used for playing the amplified final signal;
the first Wilson current source circuit is connected with the differential input stage circuit and used for providing bias current for the differential input stage circuit, the second Wilson current source circuit is connected with the common-emitter amplifying circuit and used for providing bias current for the common-emitter amplifying circuit, and the third Wilson current source circuit is connected with the quasi-complementary output stage circuit and used for providing bias current for the quasi-complementary output stage circuit;
the base electrode and the collector electrode of the transistor T9 are connected with the emitter electrode of the transistor T11, and the base electrode and the collector electrode of the transistor T10 are connected with the emitter electrode of the transistor T12;
the cascode circuit is connected to the second wilson current source circuit through a resistor R2, and the resistor R2 is used for converting the change of the collector current into the change of the voltage.
2. The integrated operational amplifier circuit of claim 1, wherein the common-mode amplifier circuit and the quasi-complementary output stage circuit are connected by a capacitor C2, such that the direct current paths between the common-mode amplifier circuit and the quasi-complementary output stage circuit are not communicated, and the static operating points of the common-mode amplifier circuit and the quasi-complementary output stage circuit are ensured to be independent of each other.
3. The integrated operational amplifier circuit for an audio player of claim 1, wherein the differential input stage circuit is connected to the common-mode amplifier circuit through a capacitor C1, such that the direct current paths between the common-mode amplifier circuit and the differential input stage circuit are not communicated, and static operating points of the common-mode amplifier circuit and the differential input stage circuit are ensured to be independent of each other.
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| 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 |
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| CN201811543292.8A CN109450387B (en) | 2018-12-17 | 2018-12-17 | Integrated operational amplifier circuit for audio player |
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| CN109450387B true CN109450387B (en) | 2023-10-13 |
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Citations (4)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2648061B1 (en) * | 2012-04-06 | 2018-01-10 | Dialog Semiconductor GmbH | Output transistor leakage compensation for ultra low-power LDO regulator |
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Patent Citations (4)
| 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 |
| 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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