CN218162406U - High-performance operational amplifier replacement circuit for audio - Google Patents
High-performance operational amplifier replacement circuit for audio Download PDFInfo
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- CN218162406U CN218162406U CN202222156452.1U CN202222156452U CN218162406U CN 218162406 U CN218162406 U CN 218162406U CN 202222156452 U CN202222156452 U CN 202222156452U CN 218162406 U CN218162406 U CN 218162406U
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Abstract
The utility model provides a high performance operational amplifier replacement circuit for audio frequency, including differential amplifier circuit, constant current source and output circuit, differential amplifier circuit is external to have homophase A point input and inverting B point input, differential amplifier circuit with the constant current source output circuit is electric connection, output circuit is external to have C point output, comes from homophase A point input and/or the audio signal via inverting B point input output circuit to C point output. The utility model discloses can realize the performance that high performance operational amplifier could realize by the operational amplifier of performance medium or medium height, reduce cost by a wide margin and widened the lectotype scope. High performance operational amplifiers may be substituted in audio signal amplification, audio signal buffering, and other audio circuits where the use of high performance operational amplifiers is desired.
Description
Technical Field
The utility model relates to an audio circuit technical field, concretely relates to a high performance operational amplifier replacement circuit for audio frequency.
Background
In order to obtain lower noise and lower distortion, a high-performance audio amplifier circuit can only be designed by selecting a high-performance operational amplifier, but the selectable models of the high-performance operational amplifier are rare and high in cost, so that certain limitation is caused on the design of the circuit.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a high performance operational amplifier replacement circuit for audio.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a high performance operational amplifier replacement circuit for audio frequency, includes differential amplifier circuit, constant current source and output circuit, and differential amplifier circuit is external to have homophase A point input and antiphase B point input, differential amplifier circuit with the constant current source output circuit is electric connection, output circuit is external to have C point output, comes homophase A point input and/or the audio signal of antiphase B point input via output circuit to C point output.
The utility model discloses in, preferably, differential amplifier circuit includes at least two sets of geminate transistors that connect in parallel each other, and its group is to the pipe including first triode and second triode, and it is organized the geminate transistor includes third triode and fourth triode, the base of first triode with homophase A point input end links to each other, the projecting pole of first triode with the projecting pole of second triode links to each other, the external VEE terminal of seventh resistance is passed through to the collecting electrode of first triode, the base of second triode with opposition B point input end links to each other, the external VEE terminal of eighth resistance is passed through to the collecting electrode of second triode, base, collecting electrode, the projecting pole of third triode respectively with base, collecting electrode, the projecting pole of first triode link to each other, base, collecting electrode, the projecting pole of fourth triode respectively with the base of second triode, collecting electrode, projecting pole link to each other.
The utility model discloses in, preferably, the constant current source includes seventh triode and eighth triode, the projecting pole of seventh triode is connected with the VCC terminal through ninth resistor is external, just the projecting pole of seventh triode links to each other with the base of eighth triode, the collecting electrode of eighth triode links to each other with the base of seventh triode, the collecting electrode of seventh triode even in the projecting pole of first triode with between the projecting pole of second triode, the base of seventh triode passes through tenth resistance ground connection, the external VCC terminal of projecting pole of eighth triode.
The utility model discloses in, preferably, output circuit includes operational amplifier, operational amplifier's inverting input end passes through the twelfth resistance and links to each other with the collecting electrode of first triode, just operational amplifier's inverting input end passes through third electric capacity ground connection, operational amplifier's normal phase input end passes through the thirteenth resistance and links to each other with the collecting electrode of second triode, operational amplifier's output passes through the fifteenth resistance and links to each other with the C point output.
The utility model discloses in, preferably, first triode, second triode the third triode the fourth triode the seventh triode and the eighth triode all sets up to PNP type triode.
The utility model discloses in, preferably, differential amplification circuit electric connection has stabilizing circuit, stabilizing circuit includes the first electric capacity and the eleventh resistance of series connection, first electric capacity with the collecting electrode of first triode links to each other, the eleventh resistance with the collecting electrode of second triode links to each other.
In the present invention, preferably, the output circuit further includes a second capacitor, one end of the second capacitor is connected to the thirteenth resistor, and the other end of the second capacitor is grounded.
In the present invention, preferably, the output circuit further includes a fourth capacitor and a fourteenth resistor, the fourth capacitor is connected between the fourteenth resistor and the third capacitor, the other end of the fourth capacitor is connected to the output terminal of the operational amplifier, and the third capacitor is grounded through the fourteenth resistor.
The utility model discloses in, preferably, the projecting pole of first triode even has the one end of first resistance, the other end of first resistance with the collecting electrode of seventh triode links to each other, the projecting pole of second triode even has the one end of second resistance, the other end of second resistance with the collecting electrode of seventh triode links to each other.
The utility model has the advantages and positive effects be: the utility model discloses a set up triode T1-T6, resistance R1-R8 and constitute differential amplifier circuit for the homodromous difference operation of input, reverse input and do voltage amplification. A constant current source circuit of the differential amplification circuit is formed by a seventh triode T7, an eighth triode T8, a ninth resistor R9 and a tenth resistor R10 to supply power for the differential amplification circuit; the first capacitor C1 and the eleventh resistor R11 form a circuit for improving the stability of the differential amplification circuit, and unnecessary high frequency is filtered; and the output circuit consists of a twelfth resistor R12, a thirteenth resistor R13, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourteenth resistor R14, a fifteenth resistor R15 and an operational amplifier U1 and is used for improving open-loop gain and reducing distortion. The utility model provides a high performance operational amplifier replacement circuit for audio frequency, operational amplifier that can use performance medium or medium height realizes the performance that high performance operational amplifier could realize, reduce cost by a wide margin and widened the lectotype scope. High performance operational amplifiers may be substituted in audio signal amplification, audio signal buffering, and other audio circuits where the use of high performance operational amplifiers is desired.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a high performance operational amplifier replacement circuit for audio of the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of a high performance operational amplifier replacement circuit for audio according to the present invention;
fig. 3 is a schematic circuit diagram of a second embodiment of the high performance operational amplifier replacement circuit for audio according to the present invention;
fig. 4 is a schematic circuit diagram of a third embodiment of the high performance operational amplifier replacement circuit for audio according to the present invention;
fig. 5 is a schematic circuit diagram of a fourth embodiment of a high-performance operational amplifier replacement circuit for audio of the present invention
In the figure: t1, a first triode; t2, a second triode; t3, a third triode; t4, a fourth triode; r1 and a first resistor; r2 and a second resistor; r7 and a seventh resistor; r8 and an eighth resistor; t7, a seventh triode; t8, an eighth triode; r9 and a ninth resistor; r10 and a tenth resistor; u1, an operational amplifier; r12 and a twelfth resistor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; c4, a fourth capacitor; r11 and an eleventh resistor; r13 and a thirteenth resistor; r14, fourteenth resistance; r15 and a fifteenth resistor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The first embodiment is as follows:
as shown in fig. 1, the utility model provides a high performance operational amplifier replacement circuit for audio frequency, including differential amplifier circuit, constant current source and output circuit, differential amplifier circuit is external to have homophase A point input and opposition B point input, and differential amplifier circuit and constant current source, output circuit are electric connection, and output circuit is external to have C point output, and the audio signal that comes from homophase A point input and/or opposition B point input exports via output circuit to C point output. The non-inverting A point input end, the inverting B point input end and the C point output end are consistent with the interface of the operational amplifier and can be directly replaced in the circuit. The application of the circuit is completely consistent with that of the operational amplifier, and the final effect is also consistent, but the circuit has the characteristics of controllable cost and better performance. The circuit starts to work after being connected to a positive power supply VCC terminal and a negative power supply VEE terminal. If a single-ended audio signal is input, the single-ended audio signal is connected to the in-phase point A input end or the reverse-phase point B input end; if a differential audio signal is input, the same-phase point A input end and the reverse-phase point B input end are simultaneously accessed, the audio signal is amplified by the differential amplification circuit to obtain a difference value and is input to the same-phase input and the reverse-phase input of the output circuit, and the operational amplifier U1, the third capacitor C3, the fourth capacitor C4 and the fourteenth resistor R14 form a second-order compensation circuit, so that most of open-loop gain of the circuit is provided, distortion is reduced, and finally the signal is output from the point C output end.
In this embodiment, further, the differential amplifying circuit includes at least two sets of paired transistors connected in parallel, one set of paired transistors includes a first transistor T1 and a second transistor T2, and the other set of paired transistors includes a third transistor T3 and a fourth transistor T4, a base of the first transistor T1 is connected to the in-phase point a input terminal, an emitter of the first transistor T1 is connected to an emitter of the second transistor T2, a collector of the first transistor T1 is externally connected to the VEE terminal through a seventh resistor R7, a base of the second transistor T2 is connected to the anti-phase point B input terminal, a collector of the second transistor T2 is externally connected to the VEE terminal through an eighth resistor R8, a base, a collector, and an emitter of the third transistor T3 are respectively connected to the base, the collector, and the emitter of the first transistor T1, and a base, a collector, and an emitter of the fourth transistor T4 are respectively connected to a base, a collector, and an emitter of the second transistor T2. For better performance, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, and the sixth transistor T6 may be implemented with low noise pair transistors, which may provide better uniformity and control noise of the differential amplifier circuit.
In this embodiment, further, the constant current source includes a seventh transistor T7 and an eighth transistor T8, an emitter of the seventh transistor T7 is externally connected to the VCC terminal through a ninth resistor R9, an emitter of the seventh transistor T7 is connected to a base of the eighth transistor T8, a collector of the eighth transistor T8 is connected to a base of the seventh transistor T7, a collector of the seventh transistor T7 is connected between an emitter of the first transistor T1 and an emitter of the second transistor T2, a base of the seventh transistor T7 is grounded through a tenth resistor R10, and an emitter of the eighth transistor T8 is externally connected to the VCC terminal. The VCC terminal supplies power as a positive power supply and the VEE terminal supplies power as a negative power supply.
In this embodiment, the output circuit further includes an operational amplifier U1, an inverting input terminal of the operational amplifier U1 is connected to the collector of the first transistor T1 through a twelfth resistor R12, an inverting input terminal of the operational amplifier U1 is grounded through a third capacitor C3, a non-inverting input terminal of the operational amplifier U1 is connected to the collector of the second transistor T2 through a thirteenth resistor R13, and an output terminal of the operational amplifier U1 is connected to the point C output terminal through a fifteenth resistor R15.
In this embodiment, further, first triode T1, second triode T2, third triode T3, fourth triode T4, seventh triode T7 and eighth triode T8 all set up to PNP type triode, through the triode that adopts the PNP type, can obtain wider geminate transistor lectotype scope, and the use of geminate transistor can make the circuit obtain better performance.
The second embodiment:
as shown in fig. 2, in the present embodiment, the differential amplifier circuit is further electrically connected to a stabilizing circuit, the stabilizing circuit includes a first capacitor C1 and an eleventh resistor R11 connected in series, the first capacitor C1 is connected to the collector of the first transistor T1, the eleventh resistor R11 is connected to the collector of the second transistor T2, and the stabilizing circuit including the first capacitor C1 and the eleventh resistor R11 connected in series is provided, so that the operation stability of the circuit can be further improved.
Example three:
as shown in fig. 3, in this embodiment, the output circuit further includes a second capacitor C2, one end of the second capacitor C2 is connected to the thirteenth resistor R13, the other end of the second capacitor C2 is grounded, and the second capacitor C2 may be added or omitted according to an actual debugging situation.
Example four:
as shown in fig. 4, in the present embodiment, the output circuit further includes a fourth capacitor C4 and a fourteenth resistor R14, one end of the fourth capacitor C4 is connected between the fourteenth resistor R14 and the third capacitor C3, the other end of the fourth capacitor C4 is connected to the output end of the operational amplifier U1, and the third capacitor C3 is grounded through the fourteenth resistor R14. The fourth capacitor C4 and the fourteenth resistor R14 may be added or omitted according to actual debugging conditions.
Example five:
as shown in fig. 5, in the present embodiment, further, the emitter of the first transistor T1 is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to the collector of the seventh transistor T7, the emitter of the second transistor T2 is connected to one end of a second resistor R2, and the other end of the second resistor R2 is connected to the collector of the seventh transistor T7. The first resistor R1 and the second resistor R2 can be added or omitted according to actual debugging conditions. The first triode T1 and the first resistor R1 form one group, the third triode T3 and the third resistor R3 form another group, and the fifth triode T5 and the fifth resistor R5 form another group. The parallel connection between them helps to further reduce noise, and different numbers of groups can be selected according to actual conditions.
The utility model discloses a set up triode T1-T6, resistance R1-R8 and constitute differential amplifier circuit for the homodromous difference operation of inputing, reverse input and do the voltage amplification. A constant current source circuit of the differential amplification circuit is formed by the seventh triode T7, the eighth triode T8, the ninth resistor R9 and the tenth resistor R10 to supply power for the differential amplification circuit; the first capacitor C1 and the eleventh resistor R11 form a circuit for improving the stability of the differential amplification circuit, and unnecessary high frequency is filtered; and an output circuit consisting of a twelfth resistor R12, a thirteenth resistor R13, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourteenth resistor R14, a fifteenth resistor R15 and an operational amplifier U1 is used for improving open-loop gain and reducing distortion. The utility model provides a high performance operational amplifier replacement circuit for audio frequency, operational amplifier that can use performance medium or medium height realizes the performance that high performance operational amplifier could realize, reduce cost by a wide margin and widened the lectotype scope. High performance operational amplifiers may be substituted in audio signal amplification, audio signal buffering, and other audio circuits where the use of high performance operational amplifiers is desired.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (9)
1. The utility model provides a high performance operational amplifier replacement circuit for audio frequency which characterized in that, includes differential amplifier circuit, constant current source and output circuit, and differential amplifier circuit is external to have homophase A point input and opposition B point input, differential amplifier circuit with the constant current source, output circuit is electric connection, output circuit is external to have C point output, comes from the audio signal of homophase A point input and/or opposition B point input via output circuit to C point output.
2. The operational amplifier replacing circuit as claimed in claim 1, wherein the differential amplifier circuit comprises at least two sets of coupled transistors connected in parallel, one set of coupled transistors comprises a first transistor and a second transistor, the two sets of coupled transistors comprises a third transistor and a fourth transistor, the base of the first transistor is connected to the in-phase point a input terminal, the emitter of the first transistor is connected to the emitter of the second transistor, the collector of the first transistor is connected to the VEE terminal through a seventh resistor, the base of the second transistor is connected to the reverse phase point B input terminal, the collector of the second transistor is connected to the VEE terminal through an eighth resistor, the base, the collector and the emitter of the third transistor are connected to the base, the collector and the emitter of the first transistor, respectively, and the base, the collector and the emitter of the fourth transistor are connected to the base, the collector and the emitter of the second transistor, respectively.
3. The operational amplifier replacing circuit for audio of claim 2, wherein said constant current source comprises a seventh transistor and an eighth transistor, wherein an emitter of said seventh transistor is externally connected to a VCC terminal through a ninth resistor, an emitter of said seventh transistor is connected to a base of said eighth transistor, a collector of said eighth transistor is connected to a base of said seventh transistor, a collector of said seventh transistor is connected between an emitter of said first transistor and an emitter of said second transistor, a base of said seventh transistor is grounded through a tenth resistor, and an emitter of said eighth transistor is externally connected to a VCC terminal.
4. The operational amplifier replacement circuit as claimed in claim 1, wherein the output circuit comprises an operational amplifier, the inverting input terminal of the operational amplifier is connected to the collector of the first transistor through a twelfth resistor, the inverting input terminal of the operational amplifier is connected to the ground through a third capacitor, the non-inverting input terminal of the operational amplifier is connected to the collector of the second transistor through a thirteenth resistor, and the output terminal of the operational amplifier is connected to the point C output terminal through a fifteenth resistor.
5. The operational amplifier replacement circuit of claim 3, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the seventh transistor, and the eighth transistor are configured as PNP transistors.
6. The replacement circuit of claim 2, wherein the differential amplifier circuit is electrically connected to a stabilizing circuit, the stabilizing circuit comprises a first capacitor and an eleventh resistor connected in series, the first capacitor is connected to the collector of the first transistor, and the eleventh resistor is connected to the collector of the second transistor.
7. The operational amplifier replacing circuit as claimed in claim 4, wherein the output circuit further comprises a second capacitor, one end of the second capacitor is connected to the thirteenth resistor, and the other end of the second capacitor is grounded.
8. The replacement circuit of claim 4, wherein the output circuit further comprises a fourth capacitor and a fourteenth resistor, the fourth capacitor is connected between the fourteenth resistor and the third capacitor at one end, the other end of the fourth capacitor is connected to the output terminal of the operational amplifier, and the third capacitor is grounded through the fourteenth resistor.
9. The operational amplifier replacement circuit as claimed in claim 3, wherein the emitter of the first transistor is connected to a terminal of a first resistor, the other terminal of the first resistor is connected to the collector of the seventh transistor, the emitter of the second transistor is connected to a terminal of a second resistor, and the other terminal of the second resistor is connected to the collector of the seventh transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222156452.1U CN218162406U (en) | 2022-08-15 | 2022-08-15 | High-performance operational amplifier replacement circuit for audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222156452.1U CN218162406U (en) | 2022-08-15 | 2022-08-15 | High-performance operational amplifier replacement circuit for audio |
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| Publication Number | Publication Date |
|---|---|
| CN218162406U true CN218162406U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222156452.1U Active CN218162406U (en) | 2022-08-15 | 2022-08-15 | High-performance operational amplifier replacement circuit for audio |
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| CN (1) | CN218162406U (en) |
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- 2022-08-15 CN CN202222156452.1U patent/CN218162406U/en active Active
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