CN111464141A - Digital audio power amplifier and electronic equipment - Google Patents
Digital audio power amplifier and electronic equipment Download PDFInfo
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- CN111464141A CN111464141A CN202010245523.8A CN202010245523A CN111464141A CN 111464141 A CN111464141 A CN 111464141A CN 202010245523 A CN202010245523 A CN 202010245523A CN 111464141 A CN111464141 A CN 111464141A
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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
- H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
Abstract
According to the digital audio power amplifier and the electronic equipment, the voltage division module connected with the feedback resistor is arranged in the negative feedback branch of the first integrator and the second integrator, and the voltage in the negative feedback branch is divided, so that the requirement for larger reference voltage related in the integrator is reduced when the output voltage of the digital audio power amplifier is higher, and the condition that a corresponding power amplification loop of a main current source and the integrator does not have enough voltage margin to support the normal work of a circuit is avoided; and the reference current is mirrored in the main current source through the mirror current module, so that the source current and the sink current are equal to the reference current, the influence of 1/f noise in the main current source can be improved, and the digital audio power amplifier with low bottom noise is realized.
Description
Technical Field
The invention relates to the technical field of digital audio power amplifiers, in particular to a digital audio power amplifier and electronic equipment.
Background
Class D audio power amplifiers are currently in widespread use due to their high efficiency, which exceeds 80%. Particularly in the field of electronic equipment such as mobile phones and the like, the high-efficiency audio power amplifier can not only prolong the working time of the electronic equipment and reduce the heat productivity of the electronic equipment, but also obtain larger volume and better tone quality. The class D audio power amplifiers are mainly classified into two types, one is an analog audio power amplifier, and the other is a digital audio power amplifier. The audio signal can be transmitted by the digital audio power amplifier, so that the digital audio power amplifier has extremely high RF interference resistance and low noise floor, and is widely applied at present.
However, when the output voltage of the digital audio power amplifier in the prior art reaches a higher voltage value (e.g., 10V), a situation may occur that the digital audio power amplifier cannot normally operate because the power amplifier loops corresponding to the current source and the integrator of the digital audio power amplifier do not have sufficient voltage margins.
Disclosure of Invention
In view of this, the present invention provides a digital audio power amplifier and an electronic device, which can effectively solve the technical problems in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a digital audio power amplifier, comprising: the system comprises a D-type digital modulator, a main current source, a first integrator and a second integrator;
the D-type digital modulator is used for converting the received audio digital signal into a PWMP signal and a PWMN signal;
the main current source comprises a reference current module, a first side mirror image current module and a second side mirror image current module, wherein the reference current module is used for generating a reference current, controlling the first side mirror image current module to mirror the reference current to be a first source current or a first sink current, and controlling the second side mirror image current module to mirror the reference current to be a second source current or a second sink current;
the first side mirror current module is configured to provide the first source current or the first sink current for the input end of the first integrator according to the control of the PWMP signal, and the second side mirror current module is configured to provide the first source current or the first sink current for the input end of the second integrator according to the control of the PWMN signal, where the first integrator and the second integrator are respectively configured to integrate and sum signals accessed to the input ends thereof;
and the negative feedback branch of any one of the first integrator and the second integrator comprises a feedback resistor and a voltage division module connected with the feedback resistor.
Correspondingly, the invention also provides electronic equipment which comprises the digital audio power amplifier.
Optionally, the electronic device is a terminal device or an audio device.
Compared with the prior art, the technical scheme provided by the invention at least has the following advantages:
according to the digital audio power amplifier and the electronic equipment, the voltage division module connected with the feedback resistor is arranged in the negative feedback branch of the first integrator and the second integrator, and the voltage in the negative feedback branch is divided, so that the requirement for larger reference voltage related in the integrator is reduced when the output voltage of the digital audio power amplifier is higher, and the condition that a corresponding power amplification loop of a main current source and the integrator does not have enough voltage margin to support the normal work of a circuit is avoided; and the reference current is mirrored in the main current source through the mirror current module, so that the source current and the sink current are equal to the reference current, the influence of 1/f noise in the main current source can be improved, and the digital audio power amplifier with low bottom noise is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a digital audio power amplifier according to the prior art;
fig. 2 is a schematic structural diagram of a digital audio power amplifier according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a main current source according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an integrator according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a common mode voltage generating module according to an embodiment of the present invention;
fig. 6 is a waveform diagram of charging and discharging of the first capacitor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, when the output voltage of the digital audio power amplifier in the prior art reaches a higher voltage value (for example, 10V), a situation may occur that the digital audio power amplifier cannot operate normally because the power amplifier loops corresponding to the current source and the integrator of the digital audio power amplifier do not have sufficient voltage margins.
Referring to fig. 1, a schematic structural diagram of a digital audio power amplifier in the prior art is shown, where the digital audio power amplifier includes a first side current source, a second side current source, a first integrator, and a second integrator, and any one of the first integrator and the second integrator includes a common-mode voltage generation module, an operational amplifier, a capacitor C, a power amplifier loop driving module, a feedback resistor Rfb, a transistor P, and a transistor N. Of course, in practical applications, the digital audio power amplifier further includes a digital modulator, etc., and will not be described herein again.
The digital modulator is accessed with I2S and other digital audio signals, then sampling, delta-sigma noise shaping and BD modulation are carried out on the digital audio signals, and two pulse width modulation signals, namely PWMP and PWMN, are output after delta-sigma shaped in-phase signals and delta-sigma shaped anti-phase signals are respectively compared with triangular wave signals. The first side current source provides source current or sink current for the first integrator according to the PWMP signal, and the second side current source provides source current or sink current for the second integrator according to the PWMN signal.
In operation, taking the first integrator as an example, in order to maintain the stability of the power amplifier loop in the first integrator, the Vop voltage is injected into the current value of the Vip node when being equal to the voltage of the power supply PVDD, and must be equal to the current value extracted from the Vip node when the Vop voltage is equal to 0. This means that the reference voltage VREF is equal to half the voltage of PVDD. When the digital audio power amplifier outputs a higher voltage, for example, 10V for a high voltage digital audio power amplifier, the reference voltage VREF provided by the common mode voltage generation module in the integrator is required to be 5V. And because the maximum working voltage that the corresponding power amplifier loop of first side current source and first integrator can support is 5V, there is not enough voltage margin in the corresponding power amplifier loop of first side current source and first integrator of digital audio power amplifier at this moment, and make the unable normal condition of working of digital audio power amplifier.
Based on this, the embodiment of the invention provides a digital audio power amplifier and an electronic device, which can effectively solve the technical problems in the prior art. To achieve the above object, the technical solutions provided by the embodiments of the present invention are described in detail below, and specifically, with reference to fig. 2 to 6.
Referring to fig. 2, a schematic structural diagram of a digital audio power amplifier according to an embodiment of the present invention is shown, where the digital audio power amplifier includes:
a class D digital modulator 1, a main current source, a first integrator 7 and a second integrator 8;
the class D digital modulator 1 is configured to convert a received audio digital signal into a PWMP signal and a PWMN signal.
The main current source comprises a reference current module 2, a first side mirror image current module 3 and a second side mirror image current module 4, wherein the reference current module 2 is used for generating a reference current, controlling the first side mirror image current module 3 to mirror the reference current to be a first source current or a first sink current, and controlling the second side mirror image current module 4 to mirror the reference current to be a second source current or a second sink current.
The first side mirror current module 3 is configured to provide the first source current or the first sink current for the input end Vip of the first integrator 7 according to the control of the PWMP signal, and the second side mirror current module 4 is configured to provide the first source current or the first sink current for the input end Vin of the second integrator 8 according to the control of the PWMN signal, where the first integrator 7 and the second integrator 8 are respectively configured to integrate and sum signals accessed to the input ends thereof.
And the negative feedback branch of any one of the first integrator 7 and the second integrator 8 includes a feedback resistor Rfb and a voltage division module connected to the feedback resistor.
It should be noted that the first integrator and the second integrator of the digital audio power amplifier provided by the embodiment of the present invention are used to perform an integration and summation process on the signal accessed at their input ends, and the integrators have a low-pass filtering function. The first integrator and the second integrator comprise the same component devices, and parameters of the corresponding component devices are the same. The source current provided by the invention is the current extracted from the input end of the integrator, and the sink current is the current poured into the input end of the integrator.
According to the technical scheme provided by the invention, the voltage division module connected with the feedback resistor is arranged in the negative feedback branch of the first integrator and the second integrator, and the voltage in the negative feedback branch is divided, so that the requirement on the reference voltage in the integrator is higher when the output voltage of the digital audio power amplifier is higher, and the condition that the corresponding power amplification loops of the main current source and the integrator do not have enough voltage margin to support the normal work of the circuit is avoided; and the reference current is mirrored in the main current source through the mirror current module, so that the source current and the sink current are equal to the reference current, the influence of 1/f noise in the main current source can be improved, and the digital audio power amplifier with low bottom noise is realized.
Referring to fig. 3, a schematic diagram of a main current source according to an embodiment of the present invention is shown, wherein in the main current source according to the embodiment of the present invention, the reference current module includes a reference current source IR, a first main operational amplifier 110, a second main operational amplifier 120, a third main P-type transistor P30, two first main resistors R10, and a second main resistor R20; the first side mirror current module comprises a first main P-type transistor P10, a first main N-type transistor N10, a first main resistor R10 and a second main resistor R20; the second side mirror current module comprises a second main P-type transistor P20, a second main N-type transistor N20, a first main resistor R10 and a second main resistor R20;
the gates of the first, second and third main P-type transistors P10, P20, P30 are all connected to the output of the first main operational amplifier 110, the first terminal of the first main P-type transistor P10, the first terminal of the second main P-type transistor P20, the first terminal of the third main P-type transistor P30 and the non-inverting terminal of the first main operational amplifier 110 are respectively connected to the first terminal of a respective first main resistor R10, the second terminal of the first main resistor R10 is connected to the operating voltage terminal VDD, the inverting terminal of the first main operational amplifier 110 is connected to the first terminal of the third main P-type transistor P30, the reference current source IR is electrically connected to the non-inverting terminal of the first main operational amplifier 110, wherein a second terminal of the first main P-type transistor P10 is for outputting the first sink current, and a second terminal of the second main P20 is for outputting the second sink current;
and second ends of the third main P-type transistor P30, the first main N-type transistor N10 and the second main N-type transistor N20 are respectively connected to first ends of respective second main resistors R20, a second end of the second main resistor R20 is connected to a ground end, gates of the first main N-type transistor N10 and the second main N20 are both connected to an output end of the second main operational amplifier 120, an in-phase end of the second main operational amplifier 120 is connected to a second end of the third main P-type transistor P30, and an inverted end of the second main operational amplifier 120 is connected to a first end of the first main N-type transistor N10, wherein the first end of the first main N10 is configured to output the first source current, and the first end of the second main N-type transistor N20 is configured to output the second source current.
Can clean upThe noise of the main current source mainly comprises two parts of thermal noise and 1/f noise, wherein the main current source of the digital audio power amplifier provided by the invention mirrors reference current through the mirror current module, so that source current and sink current are equal to the reference current, the influence of the 1/f noise in the main current source can be further improved, and the digital audio power amplifier with low bottom noise is realized. And, on the premise of improving the influence of 1/f noise in the main current source, the noise in the main current source only comprises the thermal noise of the first main resistor and the second main resistor, and the thermal noise due to the resistors can be expressed as
Therefore, by optimally selecting the first main resistor and the second main resistor with larger resistance values, the thermal noise in the main current source can be reduced, and the noise of the digital audio power amplifier can be further reduced.
It should be noted that, in the embodiment of the present invention, specific resistance values of the first main resistor and the second main resistor are not limited, and the specific resistance values need to be specifically selected according to practical applications.
Referring to fig. 4, a schematic structural diagram of an integrator provided in an embodiment of the present invention is shown, where any one of the first integrator and the second integrator includes: the circuit comprises a first operational amplifier 11, a common-mode voltage generating module, a first capacitor C1, a power amplifier loop driving module, a P-type transistor P11 and an N-type transistor N11;
the inverting terminal of the first operational amplifier 11 is an input terminal of the integrator (the input terminal Vip of the first integrator/the input terminal Vin of the second integrator), the inverting terminal of the first operational amplifier 11, the first plate of the first capacitor C1 and the first terminal of the feedback resistor Rfb are all connected, the non-inverting terminal of the first operational amplifier 11 is connected to the output terminal of the common-mode voltage generating module, the common-mode voltage generating module is configured to output a reference voltage VREF, and the output terminal of the first operational amplifier 11, the second plate of the first capacitor C1 and the input terminal of the power amplifier loop driving module are all connected;
a first output end of the power amplifier loop driving module is connected with a grid electrode of the P-type transistor P11, and a second output end of the power amplifier loop driving module is connected with a grid electrode of the N-type transistor N11;
the source of the P-type transistor P11 is connected to the power supply PVDD, the source of the N-type transistor N1 is connected to the ground, the drain of the P-type transistor P11 and the drain of the N-type transistor N11 are connected to form the output terminal of the integrator (the output terminal Vop of the first integrator/the output terminal Von of the second integrator), and the voltage divider module is connected between the output terminal of the integrator and the second terminal of the feedback resistor Rfb.
Further referring to fig. 4, the voltage dividing module provided in the embodiment of the present invention includes: a first divider resistor Ra and a second divider resistor Rb, wherein a first end of the first divider resistor Ra and a first end of the second divider resistor Rb are both connected to a second end of the feedback resistor Rfb;
a second terminal of the first voltage-dividing resistor Ra is connected to an output terminal of the integrator (the output terminal Vop of the first integrator/the output terminal Von of the second integrator), and a second terminal of the second voltage-dividing resistor Rb is connected to a ground terminal.
In an embodiment of the present invention, the second voltage-dividing resistor provided by the present invention may be twice as large as the first voltage-dividing resistor, so that it can be known that the reference voltage VREF may be set to be 1/3 times as large as the voltage PVDD of the power supply, thereby reducing the requirement for a larger reference voltage involved in the integrator when the output voltage of the digital audio power amplifier is higher, and further avoiding the occurrence of the situation that the main current source and the corresponding power amplifier loop of the integrator do not have sufficient voltage margin to support the normal operation of the circuit.
Referring to fig. 5, a schematic structural diagram of a common mode voltage generating module provided in an embodiment of the present application is shown, where the common mode voltage generating module includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a second capacitor C2;
a first end of the first resistor R1 is connected with an operating voltage end VDD, and a second end of the first resistor R1, a first end of the second resistor R2 and a first end of the third resistor R3 are all connected;
the second end of the second resistor R2 and the second plate of the second capacitor C2 are both connected to the ground terminal;
the second end of the third resistor R3 and the first plate of the second capacitor C2 are connected as the output end of the common mode voltage generating module.
The following is a detailed parameter performance analysis of the digital audio power amplifier provided by the embodiment of the present invention with reference to the drawings. Referring to fig. 4 and 6, fig. 6 is a waveform diagram of charging and discharging of the first capacitor, and the relationship between the input duty ratio and the output is analyzed by taking the first integrator as an example. The charging and discharging of the first capacitor C1 of the first integrator in one period are divided into 4 stages; ic1 is the charging and discharging current of the first capacitor C1, Vc1 is the voltage of the first capacitor C1, and PVDD is the voltage of the power supply.
Stage T1: PWMP being "1", the output terminal V of the first integratorOP1', the first side mirrors the current module (the current value is I)DAC) To charge the first capacitor C1, the output signal of the digital audio power amplifier charges the first capacitor C1 through the feedback resistor Rfb:
IC1_T1＝IDAC+1/3*PVDD/Rfb；
stage T2: PWMP being "1", the output terminal V of the first integratorOPWhen the current value is equal to 0', the first side mirrors the current module (the current value is I)DAC) To charge the first capacitor C1, the output signal of the digital audio power amplifier discharges the first capacitor C1 through the feedback resistor Rfb:
IC1_T2＝IDAC-1/3*PVDD/Rfb；
stage T3: PWMP being "0", the output terminal V of the first integratorOPWhen the current value is equal to 0', the first side mirrors the current module (the current value is I)DAC) To discharge the first capacitor C1, the output signal of the digital audio power amplifier discharges the first capacitor C1 through the feedback resistor Rfb:
IC1_T3＝-IDAC-1/3*PVDD/Rfb；
stage T4: PWMP is equal to "0", and the output signal V of the first integrator 6OP1', the first side mirrors the current module (the current value is I)DAC) Is firstThe capacitor C1 discharges, and the output signal of the digital audio power amplifier charges the first capacitor C1 through the feedback resistor Rfb:
IC1_T4＝-IDAC+1/3*PVDD/Rfb；
during normal operation, the charge and discharge balance of the first capacitor C1 includes:
IC1_T1×t1+IC1_T2×t2＝-IC1_T3×t3-IC1_T4×t4
will IC1_T1～4Can be obtained by substituting the formula and finishing
IDAC×(t1+t2)-IDAC×(t3+t4)＝1/3*PVDD/Rfb×(t2+t3)-1/3*PVDD/Rfb×(t1+t4)
Wherein, t1+t2＝DIN×T，t3+t4＝(1-DIN)×T，t1+t4＝DOUT×T，t2+t3＝(1-DOUT) × T, where T is the period, DINIndicating the duty cycle of the input PWMP signal, DOUTThe duty ratio of an output signal of the audio power amplifier is defined;
finishing to obtain:
the output end Vop of the first integrator satisfies:
Vop＝DOUT*PVDD
the above formula shows that the Vop signal at the output of the first integrator is a common-mode point of 1/2 × PVDD with 50% input duty cycle DINA central signal. Thereby can beThe gain of the digital audio power amplifier is 3 Rfb IDAC。
Correspondingly, the embodiment of the invention also provides electronic equipment, and the electronic equipment comprises the digital audio power amplifier provided by any one of the embodiments.
In an embodiment of the present invention, the electronic device provided by the present invention is a terminal device or an audio device, and the present invention is not limited specifically.
According to the digital audio power amplifier and the electronic equipment, the voltage division module connected with the feedback resistor is arranged in the negative feedback branch of the first integrator and the second integrator, and the voltage in the negative feedback branch is divided, so that the requirement for larger reference voltage related in the integrator is reduced when the output voltage of the digital audio power amplifier is higher, and the condition that a corresponding power amplification loop of a main current source and the integrator does not have enough voltage margin to support the normal work of a circuit is avoided; and the reference current is mirrored in the main current source through the mirror current module, so that the source current and the sink current are equal to the reference current, the influence of 1/f noise in the main current source can be improved, and the digital audio power amplifier with low bottom noise is realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A digital audio power amplifier, comprising: the system comprises a D-type digital modulator, a main current source, a first integrator and a second integrator;
the D-type digital modulator is used for converting the received audio digital signal into a PWMP signal and a PWMN signal;
the main current source comprises a reference current module, a first side mirror image current module and a second side mirror image current module, wherein the reference current module is used for generating a reference current, controlling the first side mirror image current module to mirror the reference current to be a first source current or a first sink current, and controlling the second side mirror image current module to mirror the reference current to be a second source current or a second sink current;
the first side mirror current module is configured to provide the first source current or the first sink current for the input end of the first integrator according to the control of the PWMP signal, and the second side mirror current module is configured to provide the first source current or the first sink current for the input end of the second integrator according to the control of the PWMN signal, where the first integrator and the second integrator are respectively configured to integrate and sum signals accessed to the input ends thereof;
and the negative feedback branch of any one of the first integrator and the second integrator comprises a feedback resistor and a voltage division module connected with the feedback resistor.
2. The digital audio power amplifier of claim 1, wherein the reference current module comprises a reference current source, a first main operational amplifier, a second main operational amplifier, a third main P-type transistor, two first main resistors and a second main resistor; the first side mirror image current module comprises a first main P-type transistor, a first main N-type transistor, a first main resistor and a second main resistor; the second side mirror image current module comprises a second main P-type transistor, a second main N-type transistor, a first main resistor and a second main resistor;
the grids of the first main P-type transistor, the second main P-type transistor and the third main P-type transistor are all connected with the output end of the first main operational amplifier, the first end of the first main P-type transistor, the first end of the second main P-type transistor, the first end of the third main P-type transistor and the non-inverting end of the first main operational amplifier are respectively connected with the first ends of the corresponding first main resistors, the second end of the first main resistor is connected with a working voltage end, the inverting end of the first main operational amplifier is connected with the first end of the third main P-type transistor, the reference current source is electrically connected with the non-inverting end of the first main operational amplifier, the second end of the first main P-type transistor is used for outputting the first sinking current, and the second end of the second main P-type transistor is used for outputting the second sinking current;
and second ends of the third main P-type transistor, the first main N-type transistor and the second main N-type transistor are respectively connected to first ends of respective corresponding second main resistors, a second end of the second main resistor is connected to a ground end, gates of the first main N-type transistor and the second main N-type transistor are both connected to an output end of the second main operational amplifier, an in-phase end of the second main operational amplifier is connected to a second end of the third main P-type transistor, and an inverted end of the second main operational amplifier is connected to a first end of the first main N-type transistor, wherein the first end of the first main N-type transistor is used for outputting the first source current, and the first end of the second main N-type transistor is used for outputting the second source current.
3. The digital audio power amplifier of claim 1, wherein any one of the first integrator and the second integrator comprises: the power amplifier comprises a first operational amplifier, a common-mode voltage generation module, a first capacitor, a power amplifier loop driving module, a P-type transistor and an N-type transistor;
the inverting terminal of the first operational amplifier is the input terminal of the integrator, the inverting terminal of the first operational amplifier, the first polar plate of the first capacitor and the first terminal of the feedback resistor are all connected, the non-inverting terminal of the first operational amplifier is connected with the output terminal of the common-mode voltage generating module, the common-mode voltage generating module is used for outputting a reference voltage, and the output terminal of the first operational amplifier, the second polar plate of the first capacitor and the input terminal of the power amplifier loop driving module are all connected;
the first output end of the power amplifier loop driving module is connected with the grid electrode of the P-type transistor, and the second output end of the power amplifier loop driving module is connected with the grid electrode of the N-type transistor;
the source electrode of the P-type transistor is connected with a power supply, the source electrode of the N-type transistor is connected with a grounding end, the drain electrode of the P-type transistor and the drain electrode of the N-type transistor are connected to form the output end of the integrator, and the voltage division module is connected between the output end of the integrator and the second end of the feedback resistor.
4. The digital audio power amplifier of claim 3, wherein the common mode voltage generating module comprises: the circuit comprises a first resistor, a second resistor, a third resistor and a second capacitor;
the first end of the first resistor is connected with a working voltage end, and the second end of the first resistor, the first end of the second resistor and the first end of the third resistor are all connected;
the second end of the second resistor and the second polar plate of the second capacitor are both connected with a ground terminal;
and the second end of the third resistor and the first polar plate of the second capacitor are connected as the output end of the common-mode voltage generation module.
5. The digital audio power amplifier of claim 3, wherein the voltage divider module comprises: the feedback circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor and a first end of the second voltage-dividing resistor are both connected with a second end of the feedback resistor;
and the second end of the first voltage-dividing resistor is connected with the output end of the integrator, and the second end of the second voltage-dividing resistor is connected with the ground end.
6. The digital audio power amplifier of claim 5, wherein the second voltage divider resistor is twice the first voltage divider resistor.
7. An electronic device, characterized in that the electronic device comprises a digital audio power amplifier according to any of claims 1-6.
8. The electronic device of claim 7, wherein the electronic device is a terminal device or an audio device.
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