CN106788291A - High-power amplifier integrated circuit - Google Patents
High-power amplifier integrated circuit Download PDFInfo
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- CN106788291A CN106788291A CN201611168759.6A CN201611168759A CN106788291A CN 106788291 A CN106788291 A CN 106788291A CN 201611168759 A CN201611168759 A CN 201611168759A CN 106788291 A CN106788291 A CN 106788291A
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2178—Class D power amplifiers; Switching amplifiers using more than one switch or switching amplifier in parallel or in series
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/42—Amplifiers with two or more amplifying elements having their dc paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers
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- 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
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Amplifiers (AREA)
Abstract
Present invention is disclosed a kind of High-power amplifier integrated circuit, including input end module, switch module, AB classes circuit module, D classes circuit module and power amplifier module；Input end module receives the audio differential input signal of input；Switch module distinguishes the connection of control input end module and AB classes circuit module, input end module and D classes circuit module, AB classes circuit module and power amplifier module, and D classes circuit module and power amplifier module.High-power amplifier integrated circuit of the present invention possesses AB classes power amplifier and D class power amplifiers, the power amplifier effect of AB classes power amplifier and D class power amplifiers can respectively be realized, D classes power amplifier therein do not need the outer bootstrap capacitor of piece also can amplifying power effect, the cost of D class power amplifiers can be reduced.
Description
Technical Field
The invention relates to the field of power amplifier integrated circuits, in particular to a high-power amplifier integrated circuit.
Background
The existing power amplifier integrated circuit market does not have a high-power AB (more than 10W) class integrated power amplifier due to factors such as efficiency, heat dissipation, cost, space and the like, but the AB class power amplifier has better tone quality than a D class power amplifier and has excellent interference performance on FM, so that the market demands a high-power AB class integrated power amplifier; the class-D high-power amplifier needs an off-chip bootstrap capacitor based on the chip cost, and the area and the cost of the application scheme PCB are increased. Moreover, the existing power amplifier circuits are all of one type, so that the requirement of customers on the power amplifier effect of the AB type power amplifier circuit or the D type power amplifier circuit cannot be met on the same product.
Disclosure of Invention
The invention mainly aims to provide a high-power amplifier integrated circuit which is provided with an AB type power amplifier circuit and a D type power amplifier integrated circuit at the same time, and the D type power amplifier circuit does not need an off-chip bootstrap capacitor.
The invention provides a high-power amplifier integrated circuit, which comprises an input end module, a switch module, an AB type circuit module, a D type circuit module and a power amplification module, wherein the switch module is used for switching between an input end and an output end;
the input end module receives an audio differential input signal of analog audio input of external sound source equipment;
the switch module respectively controls the connection of the input end module and the AB type circuit module, the connection of the input end module and the D type circuit module, the connection of the AB type circuit module and the power amplification module, and the connection of the D type circuit module and the power amplification module;
the AB type circuit module gains the audio differential input signal input by the input end module and then outputs the audio differential input signal to the power amplification module; or,
the D-type circuit module gains the audio differential input signal transmitted by the input end module, converts the audio differential input signal into a high-voltage switching signal with the duty ratio changing along with the amplitude of the audio signal, and then outputs the high-voltage switching signal to the power amplification module;
and the power amplification module is used for carrying out power amplification on the audio differential input signal output by the AB type circuit module or the high-voltage switch signal output by the D type circuit module and then outputting the audio differential input signal or the high-voltage switch signal.
Furthermore, the input end module, the AB class circuit module and the power amplification module are connected in series by the switch module to form an AB class power amplification circuit, and the audio differential input signal input by the gain input end module is used for amplifying the power of the AB class power amplification circuit.
Furthermore, the input end module, the D-type circuit module and the power amplification module are connected in series by the switch module to form a D-type power amplification circuit, the audio differential input signal is converted into a high-voltage switch signal with the duty ratio changing along with the amplitude of the audio signal after being subjected to gain amplification, and the power of the high-voltage switch signal is amplified.
Further, the switch module includes a first connection module including a switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, a switch S7, a switch S8, a switch S9, and a switch S10; the input end module comprises an input end INN and an input end INP; two ends of the switch S7 and the switch S8 are respectively connected with the input end module and the AB type circuit module, the switch S7 is connected with the input end INN, and the switch S8 is connected with the input end INP; two ends of the switch S1, the switch S2, the switch S3 and the switch S4 are respectively connected with the AB type circuit module and the power amplification module; two ends of the switch S9 and the switch S10 are respectively connected with the input end module and the D-type circuit module, the switch S9 is connected with the input end INN, and the switch S10 is connected with the input end INP; two ends of the switch S5 and the switch S6 are respectively connected with the D-type circuit module and the power amplification module.
Further, the power amplification module comprises a power tube P1, a power tube P2, a power tube N1 and a power tube N2; the power tube P1 is connected with the power tube N1, and the drains of the power tube P1 and the power tube N1 are OUTP ends; the power tube P2 is connected with the power tube N2, and the drains of the power tube P2 and the power tube N2 are OUTN ends.
Further, the class AB circuit block includes a first differential closed loop amplifier and a first loop amplifier; the first differential closed-loop amplifier gains the audio differential input signal input by the input end module and sends the audio differential input signal after the gain to the first loop amplifier; and the first loop amplifier gains the audio differential input signal again and sends the audio differential input signal to the power amplification module.
Further, the first differential closed-loop amplifier comprises a resistor R1, a resistor R2, a resistor R1 ', a resistor R2', and an amplifier AMP 1; the switch S7 is connected in series with the input terminal INN and the resistor R1; the other end of the resistor R1 is connected with a differential input negative interface of the amplifier AMP 1; two ends of the resistor R2 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 1; the switch S8 is connected in series with the input end INP and the resistor R1'; the other end of the resistor R1' is connected with a differential input positive interface of the amplifier AMP 1; two ends of the resistor R2' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 1; the resistor R1 and the resistor R1' are the same resistor; the resistor R2 and the resistor R2' are the same resistor; the amplifier AMP1 is a high voltage amplifier.
Further, the first loop amplifier includes a resistor R3, a resistor R4, a resistor R3 ', a resistor R4', an amplifier AMP2, and an amplifier AMP 3; the resistor R3 and the resistor R3' are the same resistor; the resistor R4 and the resistor R4' are the same resistor; the amplifiers AMP2 and AMP3 are amplifiers of the same model, and the amplifiers AMP2 and AMP3 are both high-voltage amplifiers; two ends of the resistor R4 are respectively connected with a differential output negative interface of the amplifier AMP1 and a differential input negative interface of the amplifier AMP 2; one end of the resistor R3 is connected with a differential input negative interface of the amplifier AMP2, and the other end is connected with an OUTP end; two ends of the resistor R4' are respectively connected with a differential output positive interface of the amplifier AMP1 and a differential input positive interface of the amplifier AMP 3; one end of the resistor R3 'is connected with a differential input positive interface of the amplifier AMP3, and the other end of the resistor R3' is connected with the OUTN end; the differential input negative interface of amplifier AMP3 and the differential input positive interface of amplifier AMP2 are connected to a reference level REF; a differential output positive interface of the amplifier AMP2 is connected to the switch S1, and a differential output negative interface is connected to the switch S2; the switch S1 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S2 is connected with the GATE ends of the power tube N1 and the power tube N2; a differential output positive interface of the amplifier AMP3 is connected to the switch S3, and a differential output negative interface is connected to the switch S4; the switch S3 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S4 connects the GATE terminals of the power transistor N1 and the power transistor N2.
Furthermore, the D-type circuit module comprises a second differential closed-loop amplifier, a third differential closed-loop amplifier and a comparison and conversion module; the second differential closed-loop amplifier gains the audio differential input signal input by the input end module and then sends the audio differential input signal to a third differential closed-loop amplifier; the third differential closed-loop amplifier gains the audio differential input signal again and converts the audio differential input signal into a low-voltage audio differential input signal, and the third differential closed-loop amplifier sends the low-voltage audio differential input signal after the gain to the comparison and conversion module; the comparison and conversion module converts the low-voltage audio differential input signal and the comparison triangular wave into a high-voltage switch signal, and the comparison and conversion module sends the high-voltage switch signal to the power amplification module.
Further, the second differential closed-loop amplifier includes a resistor R5, a resistor R6, a resistor R5 ', a resistor R6', and an amplifier AMP 4; the switch S9 is connected in series with the input terminal INN and the resistor R5; the other end of the resistor R5 is connected with a differential input negative interface of the amplifier AMP 4; two ends of the resistor R6 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 4; the switch S10 is connected in series with the input terminal INN and the resistor R5'; the other end of the resistor R5' is connected with a differential input positive interface of the amplifier AMP 4; the two ends of the resistor R6 'are respectively connected with the differential input positive interface and the differential output positive interface of the amplifier AMP4, and the resistor R5 and the resistor R5' are the same resistor; the resistor R6 and the resistor R6' are the same resistor;
the third differential closed-loop amplifier comprises a resistor R7, a resistor R8, a resistor R7 ', a resistor R8', an amplifier AMP5, a capacitor C1 and a capacitor C2; the resistor R7 and the resistor R7' are the same resistor; the resistor R8 and the resistor R8' are the same resistor; the capacitor C1 and the capacitor C2 are the same capacitor; the amplifier AMP5 is a low-voltage amplifier, and two ends of the resistor R7 are respectively connected with a differential output negative interface of the amplifier AMP4 and a differential input negative interface of the amplifier AMP 5; one end of the resistor R8 is connected with a differential input negative interface of the amplifier AMP5, and the other end is connected with an OUTP end; two ends of the capacitor C1 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 5; two ends of the resistor R7' are respectively connected with a differential output positive interface of the amplifier AMP4 and a differential input positive interface of the amplifier AMP 5; one end of the resistor R8' is connected with a differential input positive interface of the amplifier AMP5, and the other end is connected with an OUTP end; two ends of the capacitor C1' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 5;
the comparison and conversion module comprises a comparator COMP1, a comparator COMP2, a level conversion circuit LS ', a BUFFER BUFFER and a BUFFER BUFFER'; comparator COMP1 is the same as comparator COMP 2; the level shift circuit LS is the same as the level shift circuit LS'; BUFFER, and BUFFER' are the same; comparator COMP1 and comparator COMP2 are low voltage comparators; both comparator COMP1 and comparator COMP2 are low voltage comparators; the comparator COMP1 has an input negative interface connected with the differential output negative interface of the amplifier AMP 5; the comparator COMP2 has an input positive interface connected with the differential output positive interface of the amplifier AMP 5; an input positive interface of the comparator COMP1 and an input negative interface of the comparator COMP2 are connected to serve as comparison triangular waves; an output interface of the comparator COMP1 and an output interface of the comparator COMP2 are respectively connected with the level conversion circuit LS and the level conversion circuit LS'; the output end of the level conversion circuit LS is connected with the BUFFER BUFFER and one end of the switch S6; the output end of the level conversion circuit LS 'is connected with the BUFFER BUFFER' and one end of the switch S5; one end of the switch S5 is connected with the BUFFER BUFFER, and the other end is connected with the GATE ends of the power tube P1 and the power tube P2; one end of the switch S6 is connected to the BUFFER, and the other end is connected to the GATE ends of the power tube N1 and the power tube N2.
The high-power amplifier integrated circuit provided by the invention is provided with the AB type power amplifier circuit and the D type power amplifier circuit at the same time, so that the power amplification effects of the AB type power amplifier circuit and the D type power amplifier circuit can be respectively realized, the D type power amplifier circuit can also realize the power amplification effect without an off-chip bootstrap capacitor, and the cost of the D type power amplifier circuit can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a high-power amplifier integrated circuit according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a high-power amplifier integrated circuit according to the present invention;
FIG. 3 is a schematic structural diagram of a class AB power amplifier circuit according to an embodiment of the high power amplifier integrated circuit of the present invention;
fig. 4 is a schematic structural diagram of a class D power amplifier circuit in an embodiment of the high-power amplifier integrated circuit of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the high power amplifier integrated circuit according to an embodiment of the present invention has a working voltage of 12V; the power amplifier comprises an input end module 4, a switch module 5, an AB type circuit module 1, a D type circuit module 2 and a power amplification module 3; the input end module 4 receives an audio differential input signal of analog audio input of an external audio source device and conducts and inputs the audio differential input signal to the high-power amplifier integrated circuit; the switch respectively controls the connection of the input end module 4 and the AB type circuit module 1, the connection of the input end module 4 and the D type circuit module 2, the connection of the AB type circuit module 1 and the power amplification module 3, and the connection of the D type circuit module 2 and the power amplification module 3; the input end module 4, the AB type circuit module 1 and the power amplification module 3 are connected in series by the switch module 5 to form an AB type power amplification circuit which can gain audio differential input signals and amplify power; the input end module 4, the D-type circuit module 2 and the power amplification module 3 are connected in series by the switch module 5 to form a D-type power amplification circuit, and can gain an audio differential input signal and convert the audio differential input signal into a high-voltage switch signal with the duty ratio changing along with the amplitude of the audio signal and amplify the power; the AB type circuit module 1 sends the audio differential input signal transmitted by the gain input end module 4 to the power amplification module 3; the class-D circuit module 2 gains and amplifies the audio differential input signal transmitted by the input end module 4, converts the audio differential input signal into a high-voltage switching signal with the duty ratio changing along with the amplitude of the audio signal, and then transmits the high-voltage switching signal to the power amplification module 3. The high-power amplifier integrated circuit provided by the invention is provided with the AB type power amplifier circuit and the D type power amplifier circuit at the same time, so that the power amplification effects of the AB type power amplifier circuit and the D type power amplifier circuit can be respectively realized, the D type power amplifier circuit can also realize the power amplification effect without an off-chip bootstrap capacitor, and the cost of the D type power amplifier circuit can be reduced.
The input terminal block 4 includes an input terminal INN and an input terminal INP. The switch module 5 comprises the first connection module including a switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, a switch S7, a switch S8, a switch S9, and a switch S10; two ends of the switch S7 and the switch S8 are respectively connected with the input end module 4 and the AB type circuit module 1; two ends of the switch S1, the switch S2, the switch S3 and the switch S4 are respectively connected with the AB type circuit module 1 and the power amplification module 3; two ends of the switch S9 and the switch S10 are respectively connected with the input end module 4 and the D-type circuit module 2; two ends of the switch S5 and the switch S6 are respectively connected with the D-type circuit module 2 and the power amplification module 3.
The power amplification module 3 comprises a power tube P1, a power tube P2, a power tube N1 and a power tube N2; the power tube P1 is connected with the power tube N1, and the drains of the power tube P1 and the power tube N1 are OUTP ends; the power tube P2 is connected with the power tube N2, and the drains of the power tube P2 and the power tube N2 are OUTN ends.
Referring to fig. 3, the class AB circuit block 1 comprises a first differential closed loop amplifier 11 and a first loop amplifier 12; the first differential closed-loop amplifier 11 gains the audio differential input signal input by the input terminal module 4, and sends the audio differential input signal after the gain to the first loop amplifier 12; the first loop amplifier 12 gains the audio differential input signal again and sends the audio differential input signal to the power amplification module.
The first differential closed-loop amplifier 11 includes a resistor R1, a resistor R2, a resistor R1 ', a resistor R2', and an amplifier AMP 1;
the switch S7 is connected in series with the input terminal INN and the resistor R1; the other end of the resistor R1 is connected with a differential input negative interface of the amplifier AMP 1; two ends of the resistor R2 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 1; the switch S8 is connected in series with the input end INP and the resistor R1'; the other end of the resistor R1' is connected with a differential input positive interface of the amplifier AMP 1; two ends of the resistor R2' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 1; the resistor R1 and the resistor R1' are the same resistor; the resistor R2 and the resistor R2' are the same resistor; the amplifier AMP1 is a high voltage amplifier. The first differential closed-loop amplifier 11 amplifies the audio differential input signals INN and INP by a gain R2/R1 times
The first loop amplifier 12 includes a resistor R3, a resistor R4, a resistor R3 ', a resistor R4', an amplifier AMP2, and an amplifier AMP 3; the resistor R3 and the resistor R3' are the same resistor; the resistor R4 and the resistor R4' are the same resistor; the amplifiers AMP2 and AMP3 are amplifiers of the same model, and the amplifiers AMP2 and AMP3 are both high-voltage amplifiers; two ends of the resistor R4 are respectively connected with a differential output negative interface of the amplifier AMP1 and a differential input negative interface of the amplifier AMP 2; one end of the resistor R3 is connected with a differential input negative interface of the amplifier AMP2, and the other end is connected with an OUTP end; two ends of the resistor R4' are respectively connected with a differential output positive interface of the amplifier AMP1 and a differential input positive interface of the amplifier AMP 3; one end of the resistor R3 'is connected with a differential input positive interface of the amplifier AMP3, and the other end of the resistor R3' is connected with an OUTN end; the differential input negative interface of amplifier AMP3 and the differential input positive interface of amplifier AMP2 are connected to a reference level REF; a differential output positive interface of the amplifier AMP2 is connected to the switch S1, and a differential output negative interface is connected to the switch S2; the switch S1 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S2 is connected with the GATE ends of the power tube N1 and the power tube N2; a differential output positive interface of the amplifier AMP3 is connected to the switch S3, and a differential output negative interface is connected to the switch S4; the switch S3 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S4 connects the GATE terminals of power transistor N1 and power transistor N2. The amplification gain of the audio differential input signal output by the first differential closed loop amplifier 11 is R3/R4 times the gain of the differential input signal.
In the class AB circuit block 1, the audio differential input signal gain (R2 × R3)/(R1 × R4) inputted to the input terminal INN and the input terminal INP is multiplied by the power amplification block 3, and thus a better sound quality amplification effect can be achieved.
Referring to fig. 4, the class D circuit block 2 includes a second differential closed loop amplifier 21, a third differential closed loop amplifier 22, and a comparison conversion block 23;
the second differential closed-loop amplifier 21 gains the audio differential input signal input by the input terminal module 4, and then sends the audio differential input signal to the third differential closed-loop amplifier 22; the third differential closed-loop amplifier 22 performs gain conversion on the audio differential input signal again to obtain a low-voltage audio differential input signal, and the third differential closed-loop amplifier 22 sends the low-voltage audio differential input signal after gain to the comparison and conversion module 23; the comparison and conversion module 23 converts the low-voltage audio differential input signal and the comparison triangular wave into a high-voltage switch signal, and the comparison and conversion module 23 sends the high-voltage switch signal to the power amplification module.
The second differential closed-loop amplifier 21 includes a resistor R5, a resistor R6, a resistor R5 ', a resistor R6', and an amplifier AMP 4; the switch S9 is connected in series with the input terminal INN and the resistor R5; the other end of the resistor R5 is connected with a differential input negative interface of the amplifier AMP 4; two ends of the resistor R6 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 4; the switch S10 is connected in series with the input terminal INN and the resistor R5'; the other end of the resistor R5' is connected with a differential input positive interface of the amplifier AMP 4; the two ends of the resistor R6 'are respectively connected with the differential input positive interface and the differential output positive interface of the amplifier AMP4, and the resistor R5 and the resistor R5' are the same resistor; the resistor R6 and the resistor R6' are the same resistor; the second differential closed loop amplifier 21 amplifies the audio differential input signals INN and INP by a gain of R6/R5.
The third differential closed-loop amplifier 22 comprises a resistor R7, a resistor R8, a resistor R7 ', a resistor R8', an amplifier AMP5, a capacitor C1 and a capacitor C2; the resistor R7 and the resistor R7' are the same resistor; the resistor R8 and the resistor R8' are the same resistor; the capacitor C1 and the capacitor C2 are the same capacitor; the amplifier AMP5 is a low-voltage amplifier, and two ends of the resistor R7 are respectively connected with a differential output negative interface of the amplifier AMP4 and a differential input negative interface of the amplifier AMP 5; one end of the resistor R8 is connected with a differential input negative interface of the amplifier AMP5, and the other end is connected with an OUTP end; two ends of the capacitor C1 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 5; two ends of the resistor R7' are respectively connected with a differential output positive interface of the amplifier AMP4 and a differential input positive interface of the amplifier AMP 5; one end of the resistor R8' is connected with a differential input positive interface of the amplifier AMP5, and the other end is connected with an OUTP end; two ends of the capacitor C1' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 5; the third differential closed-loop amplifier 22 amplifies the audio differential input signal sent by the second differential closed-loop amplifier 21, and converts the gain of the audio differential input signal into a low-voltage audio differential input signal, wherein the gain multiple of the low-voltage audio differential input signal is R8/R7 times; the third differential closed loop amplifier 22 sends the low voltage audio differential input signal to the comparison and conversion module 23.
The comparison conversion module 23 includes a comparator COMP1, a comparator COMP2, a level conversion circuit LS ', a BUFFER, and a BUFFER'; comparator COMP1 is the same as comparator COMP 2; the level shift circuit LS is the same as the level shift circuit LS'; BUFFER, and BUFFER' are the same; comparator COMP1 and comparator COMP2 are low voltage comparators; both comparator COMP1 and comparator COMP2 are low voltage comparators; the comparator COMP1 has an input negative interface connected with the differential output negative interface of the amplifier AMP 5; the comparator COMP2 has an input positive interface connected with the differential output positive interface of the amplifier AMP 5; an input positive interface of the comparator COMP1 and an input negative interface of the comparator COMP2 are connected to serve as comparison triangular waves; an output interface of the comparator COMP1 and an output interface of the comparator COMP2 are respectively connected with the level conversion circuit LS and the level conversion circuit LS'; the output end of the level conversion circuit LS is connected with the BUFFER BUFFER and one end of the switch S6; the output end of the level conversion circuit LS 'is connected with the BUFFER BUFFER' and one end of the switch S5; one end of the switch S5 is connected with the BUFFER BUFFER, and the other end is connected with the GATE ends of the power tube P1 and the power tube P2; one end of the switch S6 is connected to the BUFFER, and the other end is connected to the GATE ends of the power tube N1 and the power tube N2.
In the class-D circuit module 2, the audio differential input signal gain (R6 × R8)/(R5 × R7) input from the input terminal INN and the input terminal INP is converted into a high-voltage switching signal whose duty ratio varies with the amplitude of the audio signal, and the high-voltage switching signal is amplified by the power amplification module 3 and then output.
The power tube P1, the power tube P2, the power tube N1 and the power tube N2 are high-voltage Vgs power tubes.
The lowest turn-on voltage of the power tube P1, the power tube P2, the power tube N1 and the power tube N2 is 0V. The lowest turn-off voltage of power tube P1, power tube P2, power tube N1 and power tube N2 is 12V. The output range reaches 12V of the high-voltage power supply to the ground, namely 0V, and the output high-power amplifier integrated circuit is realized.
When the AB type power amplification circuit is selected, the switch S7, the switch S8, the switch S1, the switch S2, the switch S3 and the switch S4 are closed, the switch S9, the switch S10, the switch S5 and the switch S6 are opened, and the AB type power amplification circuit is connected.
In the AB class power amplifier circuit, an input terminal INN and an input terminal INP input audio differential input signals to a first differential closed loop amplifier 11, wherein the first differential closed loop amplifier 11 is composed of resistors R1, R2, R1 ', R2' and an amplifier AMP 1; the first differential closed loop amplifier 11 amplifies the audio differential input signal by a gain factor of R2/R1; the first differential closed-loop amplifier 11 sends the audio differential input signal with the multiple of the gain R2/R1 to the first loop amplifier 12, the first loop amplifier 12 is composed of a resistor R3, a resistor R4, a resistor R3 ', a resistor R4', an amplifier AMP2, an amplifier AMP3, a power tube P1, a power tube P2, a power tube N1 and a power tube N2, the audio differential input signal input by the first differential closed-loop amplifier 11 in the first loop amplifier 12 has the multiple of the gain R3/R4, and then the power is amplified by the power amplification module 3 and then output to external devices such as a loudspeaker, a player and the like; the power amplification module 3 can be directly driven from the ground to the power supply voltage, and the high-power output effect is realized. The gain (R2R 4)/(R1R 3) of the audio differential input signal is input to the input end INN and the input end INP in the AB class power amplifier circuit in a common pair, so that the gain effect of the AB class power amplifier circuit is achieved.
When the D-type power amplifier circuit is selected, the switch S9, the switch S10, the switch S1, the switch S2, the switch S3 and the switch S4 are opened, the switch S9, the switch S10, the switch S5 and the switch S6 are closed, and the D-type power amplifier circuit is connected.
In the class-D power amplifier circuit, the input terminal INN and the input terminal INP input the audio differential input signal to the second differential closed-loop amplifier 21, and the second differential closed-loop amplifier 21 is composed of resistors R5, R6, R5 ', R6' and an amplifier AMP 4; the second differential closed loop amplifier 21 amplifies the audio differential input signal by a gain factor of R6/R5; the second differential closed loop amplifier 21 inputs the audio differential input signal with the multiple of gain R6/R5 into the second loop amplifier 22, and the second loop amplifier 22 is composed of resistors R7, R8, R7 ', R8', an amplifier AMP5 and capacitors C1 and C2; the second loop amplifier 22 amplifies the audio differential input signal output by the second differential closed loop amplifier 21 by the low voltage audio differential input signal of gain R8/R7; the second loop amplifier 22 sends the low-voltage audio differential input signal to the comparison and conversion module 23; the comparison and conversion module 23 is composed of a comparator COMP1, a comparator COMP2, a level conversion circuit LS', a BUFFER, and a BUFFER; the comparison and conversion module 23 converts the signal emitted by the second loop amplifier 22 into a high-voltage switching signal whose duty ratio changes with the amplitude of the audio signal, and the high-voltage switching signal is amplified by the power amplification module 3 and then output to external equipment such as a loudspeaker, a player and the like. The power amplification module 3 can be directly driven from the ground to the power supply voltage, and the high-power output effect can be realized without an off-chip bootstrap capacitor, so that the aim of reducing the cost is fulfilled.
In the class-D circuit module 2, the resistors R7, R8, R7 ', R8', AMP5 and the capacitors C1 and C2 form a third differential closed-loop amplifier 22, the second differential closed-loop amplifier 21 inputs the audio differential input signal with a multiple of the gain R6/R5 into the third differential closed-loop amplifier 22, the third differential closed-loop amplifier 22 multiplies the gain R8/R7 of the audio differential input signal output by the second differential closed-loop amplifier 21, and the input terminal INN and the input terminal INP input audio differential input signal have a common gain (R6R 8)/(R5R 7); the third differential closed loop amplifier 22 transfers the gain audio differential input signal to comparator COMP1 and comparator COMP 2; the comparator COMP1 and the comparator COMP2 convert the audio differential input signal and the comparison triangular wave input by the third differential closed-loop amplifier 22 into a switching signal with a space ratio varying with the amplitude of the audio signal, wherein the switching signal is a low-voltage level signal; then, the switching signals are input to a level shift circuit LS and a level shift circuit LS' by a comparator COMP1 and a comparator COMP 2; the level conversion circuit LS and the level conversion circuit LS' convert the low-voltage level signal into a high-voltage switch signal; the high voltage switch signal passes through the BUFFER BUFFER and the BUFFER BUFFER' and the closed switches S5 and S6 to reach the GATE terminals of the power tube P1, the power tube P2, the power tube N1 and the power tube N2.
Because the power tube P1, the power tube P2, the power tube N1 and the power tube N2 adopt high-voltage Vgs power tubes, the power tube is opened when the GATE end is at a low level (the ground voltage of a chip), and the power tube is closed when the GATE end of the power tube is at a high level (the power supply voltage of the chip), the class-D high-power amplifier does not need an off-chip bootstrap capacitor; the class-D system converts analog signals of audio inputs INN and INP to high-voltage switching signals of OUTP and OUTN, which adjust duty ratios with the audio differential input signals.
The high-power amplifier integrated circuit provided by the invention has the AB type power amplifier circuit and the D type power amplifier circuit, and can respectively realize the power amplification effects of the AB type power amplifier circuit and the D type power amplifier circuit, wherein the D type power amplifier circuit can also realize the power amplification effect without an off-chip bootstrap capacitor, so that the PCB area and the cost of a market application end are reduced, and the cost of the D type power amplifier circuit can be reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A high-power amplifier integrated circuit is characterized by comprising an input end module, a switch module, an AB type circuit module, a D type circuit module and a power amplification module;
the input end module receives an audio differential input signal of analog audio input of external sound source equipment;
the switch module respectively controls the connection between the input end module and the AB type circuit module, between the input end module and the D type circuit module, between the AB type circuit module and the power amplification module, and between the D type circuit module and the power amplification module;
the AB type circuit module gains the audio differential input signal input by the input end module and then outputs the audio differential input signal to the power amplification module; or,
the D-type circuit module gains the audio differential input signal transmitted by the input end module, converts the audio differential input signal into a high-voltage switching signal with the duty ratio changing along with the amplitude of the audio signal, and then outputs the high-voltage switching signal to the power amplification module;
and the power amplification module is used for carrying out power amplification on the audio differential input signal output by the AB type circuit module or the high-voltage switch signal output by the D type circuit module and then outputting the audio differential input signal or the high-voltage switch signal.
2. The high power amplifier integrated circuit of claim 1, wherein the input module, the class AB circuit module and the power amplifier module are connected in series by the switch module to form a class AB power amplifier circuit, and the gain input module is used for inputting the audio differential input signal and amplifying the power of the audio differential input signal.
3. The high power amplifier integrated circuit of claim 2,
the input end module, the D-type circuit module and the power amplification module are connected in series by the switch module to form a D-type power amplification circuit, the audio differential input signal is converted into a high-voltage switch signal with the duty ratio changing along with the amplitude of the audio signal after being subjected to gain amplification, and the power of the high-voltage switch signal is amplified.
4. The high power amplifier integrated circuit of claim 3, wherein the switch module comprises the first connection module including a switch S1, a switch S2, a switch S3, a switch S4, a switch S5, a switch S6, a switch S7, a switch S8, a switch S9 and a switch S10; the input end module comprises an input end INN and an input end INP;
the switch S7 and the switch S8 are connected with the input end module and the AB class circuit module respectively, the switch S7 is connected with the input end INN, and the switch S8 is connected with the input end INP;
two ends of the switch S1, the switch S2, the switch S3 and the switch S4 are respectively connected with the AB class circuit module and the power amplification module;
the switch S9 and the switch S10 are connected with the input end module and the class D circuit module respectively, the switch S9 is connected with the input end INN, and the switch S10 is connected with the input end INP;
two ends of the switch S5 and the switch S6 are respectively connected with the D-type circuit module and the power amplification module.
5. The high-power amplifier integrated circuit according to claim 4, wherein the power amplification module comprises a power tube P1, a power tube P2, a power tube N1 and a power tube N2;
the power tube P1 is connected with the power tube N1, and the drains of the power tube P1 and the power tube N1 are OUTP ends;
the power tube P2 is connected with the power tube N2, and the drains of the power tube P2 and the power tube N2 are OUTN ends.
6. The high power amplifier integrated circuit of claim 5, wherein the class AB circuit module comprises a first differential closed loop amplifier and a first loop amplifier; the first differential closed-loop amplifier gains the audio differential input signal input by the input end module and then sends the audio differential input signal after gain to the first loop amplifier; and the first loop amplifier gains the audio differential input signal again and sends the audio differential input signal to the power amplification module.
7. The high power amplifier integrated circuit according to claim 6, wherein the first differential closed loop amplifier comprises a resistor R1, a resistor R2, a resistor R1 ', a resistor R2', and an amplifier AMP 1;
the switch S7 is connected in series with an input terminal INN and a resistor R1; the other end of the resistor R1 is connected with a differential input negative interface of the amplifier AMP 1; two ends of the resistor R2 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 1; the switch S8 is connected in series with an input terminal INP and a resistor R1'; the other end of the resistor R1' is connected with a differential input positive interface of the amplifier AMP 1; two ends of the resistor R2' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 1; the resistor R1 and the resistor R1' are the same resistor; the resistor R2 and the resistor R2' are the same resistor; the amplifier AMP1 is a high voltage amplifier.
8. The high power amplifier integrated circuit of claim 7, wherein the first loop amplifier comprises a resistor R3, a resistor R4, a resistor R3 ', a resistor R4', an amplifier AMP2 and an amplifier AMP 3; the resistor R3 and the resistor R3' are the same resistor; the resistor R4 and the resistor R4' are the same resistor; the amplifiers AMP2 and AMP3 are amplifiers of the same model, and the amplifiers AMP2 and AMP3 are both high-voltage amplifiers; two ends of the resistor R4 are respectively connected with a differential output negative interface of the amplifier AMP1 and a differential input negative interface of the amplifier AMP 2; one end of the resistor R3 is connected with a differential input negative interface of the amplifier AMP2, and the other end of the resistor R3 is connected with an OUTP end; two ends of the resistor R4' are respectively connected with a differential output positive interface of the amplifier AMP1 and a differential input positive interface of the amplifier AMP 3; one end of the resistor R3 'is connected with a differential input positive interface of an amplifier AMP3, and the other end of the resistor R3' is connected with the OUTN end; the differential input negative interface of the amplifier AMP3 and the differential input positive interface of the amplifier AMP2 are connected as a reference level REF; a differential output positive interface of the amplifier AMP2 is connected to the switch S1, and a differential output negative interface is connected to the switch S2; the switch S1 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S2 is connected with the GATE ends of the power tube N1 and the power tube N2; a differential output positive interface of the amplifier AMP3 is connected to the switch S3, and a differential output negative interface is connected to the switch S4; the switch S3 is connected with the GATE ends of the power tube P1 and the power tube P2; the switch S4 connects the GATE terminals of the power transistor N1 and the power transistor N2.
9. The high power amplifier integrated circuit of claim 8, wherein the class D circuit module comprises a second differential closed loop amplifier, a third differential closed loop amplifier and a comparison and conversion module;
the second differential closed-loop amplifier gains the audio differential input signal input by the input end module and then sends the audio differential input signal to the third differential closed-loop amplifier; the third differential closed-loop amplifier gains the audio differential input signal again and converts the audio differential input signal into a low-voltage audio differential input signal, and the third differential closed-loop amplifier sends the low-voltage audio differential input signal after the gain to the comparison and conversion module; the comparison and conversion module converts the low-voltage audio differential input signal and the comparison triangular wave into a high-voltage switch signal, and the comparison and conversion module sends the high-voltage switch signal to the power amplification module.
10. The high power amplifier integrated circuit of claim 9,
the second differential closed loop amplifier comprises a resistor R5, a resistor R6, a resistor R5 ', a resistor R6', and an amplifier AMP 4; the switch S9 is connected in series with an input terminal INN and a resistor R5; the other end of the resistor R5 is connected with a differential input negative interface of the amplifier AMP 4; two ends of the resistor R6 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 4; the switch S10 is connected in series with an input terminal INN and a resistor R5'; the other end of the resistor R5' is connected with a differential input positive interface of the amplifier AMP 4; the two ends of the resistor R6 'are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP4, and the resistor R5 and the resistor R5' are the same resistor; the resistor R6 and the resistor R6' are the same resistor.
The third differential closed-loop amplifier comprises a resistor R7, a resistor R8, a resistor R7 ', a resistor R8', an amplifier AMP5, a capacitor C1 and a capacitor C2; the resistor R7 and the resistor R7' are the same resistor; the resistor R8 and the resistor R8' are the same resistor; the capacitor C1 and the capacitor C2 are the same capacitor; the amplifier AMP5 is a low-voltage amplifier, and two ends of the resistor R7 are respectively connected with a differential output negative interface of the amplifier AMP4 and a differential input negative interface of the amplifier AMP 5; one end of the resistor R8 is connected with a differential input negative interface of the amplifier AMP5, and the other end of the resistor R8 is connected with an OUTP end; two ends of the capacitor C1 are respectively connected with a differential input negative interface and a differential output negative interface of the amplifier AMP 5; two ends of the resistor R7' are respectively connected with a differential output positive interface of the amplifier AMP4 and a differential input positive interface of the amplifier AMP 5; one end of the resistor R8 'is connected with a differential input positive interface of the amplifier AMP5, and the other end of the resistor R8' is connected with an OUTP end; two ends of the capacitor C1' are respectively connected with a differential input positive interface and a differential output positive interface of the amplifier AMP 5.
The comparison and conversion module comprises a comparator COMP1, a comparator COMP2, a level conversion circuit LS ', a BUFFER BUFFER and a BUFFER BUFFER'; the comparator COMP1 is the same as the comparator COMP 2; the level conversion circuit LS and the level conversion circuit LS' are the same; the BUFFER BUFFER is the same as the BUFFER BUFFER'; comparator COMP1 and comparator COMP2 are low voltage comparators; the comparator COMP1 and the comparator COMP2 are both low-voltage comparators; the negative input interface of the comparator COMP1 is connected with the negative differential output interface of the amplifier AMP 5; the positive input interface of the comparator COMP2 is connected with the positive differential output interface of the amplifier AMP 5; an input positive interface of the comparator COMP1 and an input negative interface of the comparator COMP2 are connected to form a comparison triangular wave; an output interface of the comparator COMP1 and an output interface of the comparator COMP2 are respectively connected with the level conversion circuit LS and the level conversion circuit LS'; the output end of the level conversion circuit LS is connected with the BUFFER BUFFER and one end of the switch S6; the output end of the level conversion circuit LS 'is connected with the BUFFER BUFFER' and one end of the switch S5; one end of the switch S5 is connected to the BUFFER BUFFER, and the other end is connected to the GATE ends of the power tube P1 and the power tube P2; one end of the switch S6 is connected to the BUFFER, and the other end is connected to the GATE ends of the power transistor N1 and the power transistor N2.
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