CN118174668A - Power amplifier and audio device - Google Patents

Abstract

The application discloses a power amplifier and an audio device. The power amplifier comprises an integral amplifying module, a power amplifying module, an LC filtering module and a compensating module, wherein the integral amplifying module is connected with a signal input end and the compensating module, the integral amplifying module is used for obtaining an amplified signal according to an input signal of the signal input end and feedback and feedforward signals generated by the compensating module, the power amplifying module is connected with the integral amplifying module and used for generating a pulse width modulation signal according to the amplified signal, the LC filtering module is connected with the power amplifying module and the signal output end, the LC filtering module is used for filtering the pulse width modulation signal to generate an output signal to be output to the signal output end, and the compensating module is also connected with the integral amplifying module and the LC filtering module to form a feedback loop and used for generating a feedback signal capable of counteracting poles of the LC filtering module.

Description

Power amplifier and audio device

Technical Field

The application relates to the technical field of electronics, in particular to a power amplifier and audio equipment.

Background

The class D power amplifier has the advantages of high efficiency and small size, and reduces the requirements on heat dissipation and power supply. The working principle of the class D power amplifier is that an analog or digital audio signal is converted into a high-frequency Pulse Width Modulation (PWM) signal, the amplitude of the signal is represented by the pulse width of the PWM signal, and noise outside the signal frequency band is filtered by an LC low-pass filter, so that the frequency characteristic of the passband of the class D power amplifier is greatly dependent on the frequency characteristic of the LC filter, and the gain at the turning frequency fluctuates up and down due to the Q value change of the LC filter under different load impedance, so that the flatness of the passband is not ideal. In addition, since the LC low-pass filter is composed of a filter capacitor and a filter inductor, linearity of the filter capacitor and the filter inductor directly affects distortion degree of signals on a load, and if good output signal quality is obtained, the filter inductor and the filter capacitor with better quality need to be used, which results in higher cost of the class D power amplifier.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application needs to provide a power amplifier and an audio device.

The power amplifier of the embodiment of the application comprises an integral amplifying module, a power amplifying module, an LC filtering module and a compensating module;

The integral amplifying module is connected with the signal input end and the compensation module and is used for obtaining an amplified signal according to an input signal of the signal input end and a feedback signal generated by the compensation module;

The power amplification module is connected with the integration amplification module and is used for generating a pulse width modulation signal according to the amplified signal;

the LC filter module is connected with the power amplification module and the signal output end, and is used for filtering the pulse width modulation signal to generate an output signal so as to be output to the signal output end;

the compensation module is further connected to the integrating amplification module and the LC filter module to form a feedback loop for generating the feedback signal capable of canceling the pole of the LC filter module.

In certain embodiments, the power amplifier further comprises:

And the gain module is respectively connected with the LC filter module and the integral amplification module and is used for adjusting the gain value of the power amplifier.

In some embodiments, the gain module comprises:

one end of the first resistor is connected with the signal input end, and the other end of the first resistor is connected with the integrating amplifying module;

And one end of the second resistor is connected with the LC filter module, and the other end of the second resistor is connected with the first resistor.

In some embodiments, the integrating amplification module comprises:

The operational amplifier comprises a first input end, a second input end and an output end, wherein the first input end is connected with the first resistor and the compensation module, the second input end is connected with the grounding end, and the output end is connected with the power amplification module;

And one end of the integrating capacitor is connected with the first input end, and the other end of the integrating capacitor is connected with the output end.

In certain embodiments, the compensation module comprises:

One end of the first compensation network is connected with the LC filter module, and the other end of the first compensation network is connected with the first input end of the operational amplifier;

one end of the second compensation network is connected with the first compensation network, and the other end of the second compensation network is connected with the output end of the operational amplifier;

and one end of the third compensation network is connected with the first compensation network, and the other end of the third compensation network is connected with the first resistor.

In certain embodiments, the LC filter module comprises:

One end of the filter inductor is connected with the power amplification module, and the other end of the filter inductor is connected with the signal output end;

And one end of the filter capacitor is connected with the filter inductor, and the other end of the filter capacitor is connected with the grounding end.

In some embodiments, the power amplification module includes a feed forward loop filter circuit.

In some embodiments, the feed forward loop filter circuit includes:

one end of the integrator is connected with the integrating amplifying module;

And the pulse width modulator is connected with the other end of the integrator and the LC filter module.

The audio equipment comprises the power amplifier.

In the power amplifier and the audio device of the embodiments of the present application, the integrating amplifying module is connected to the signal input end and the compensating module, the power amplifying module is connected to the integrating amplifying module, the LC filtering module is connected to the power amplifying module and the signal output end, and the compensating module is connected to the LC filtering module to form a feedback loop, so that the LC filtering module is included in the feedback loop, and the non-rational characteristic of the LC filtering module can obtain the compensation of the feedback loop, improve the distortion of the output signal caused by the non-linearity of the output LC filtering module, reduce the non-linearity requirement of the LC filtering module, reduce the cost of the LC filtering module, and the frequency response of the power amplifier can obtain the compensation of the feedback loop, so that the pass band flatness of the power amplifier is improved, and is helpful for the frequency response of the power amplifier. In addition, the compensation module can offset the pole of the compensation LC filter module, so that the stability of the power amplifier is improved.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a block diagram of a power amplifier according to an embodiment of the present application.

Fig. 2 is a circuit schematic of a power amplifier according to an embodiment of the present application.

Description of main reference numerals:

The power amplifier 10, the integrating amplifying module 11, the operational amplifier A1, the integrating capacitor C1, the power amplifying module 12, the integrator I, the pulse width modulator 121, the LC filter module 13, the filter inductor L1, the filter capacitor C2, the compensating module 14, the first compensating network 141, the second compensating network 142, the third compensating network 143, the gain module 15, the first resistor R1, the second resistor R2, the signal input Vi, and the signal output Vo.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

The traditional AB type power amplifier works in a linear working mode, and the working current is approximately equal to the output current, so that when the output signal is smaller, most of input power is dissipated above the output power tube and converted into heat, and the energy utilization rate is very low. The ideal highest efficiency is not more than 78.5% in the case of a large output signal amplitude. When the output amplitude is relatively small, the efficiency thereof is greatly reduced.

The class D audio power amplifier modulates an input signal into a PWM signal through a PWM modulator, the amplitude of the signal is represented by the pulse width of the PWM signal, and the output power tube works in a switching state (the voltage is large but the current is zero, or the current is large but the voltage is zero), so that the power consumed by the power tube is very low by the working mode, and the working efficiency is very high, and the overall working efficiency can exceed 90%. Since the output is a PWM signal whose voltage is switched between power and ground, an LC low-pass filter needs to be connected to the output to restore the PWM signal to an analog signal.

However, the conventional class D power amplifier filters noise outside the signal band by the LC low-pass filter, and thus the frequency characteristic of the pass band of the class D power amplifier largely depends on the frequency characteristic of the LC filter, it is understood that the pass band of the power amplifier refers to a frequency range in which the power amplifier can normally operate within the frequency ranges of the input and output signals of the power amplifier. The gain of the passband at the turning frequency can fluctuate up and down under different load impedances due to the change of the Q value of the LC low-pass filter, so that the flatness of the passband is less ideal (the larger the Q value is, the better the selectivity of the LC low-pass filter is, the smaller the signal attenuation in the passband is, and the larger the signal attenuation in the stopband is).

In addition, since the LC low-pass filter is composed of a filter capacitor and a filter inductor, linearity of the filter capacitor and the filter inductor directly affects distortion degree of signals on a load, and if good output signal quality is obtained, the filter inductor and the filter capacitor with better quality need to be used, which results in higher cost of the class D power amplifier.

In view of this, referring to fig. 1, an embodiment of the present application provides a power amplifier 10, where the power amplifier 10 includes an integrating amplifying module 11, a power amplifying module 12, an LC filtering module 13, and a compensating module 14.

The integrating amplifying module 11 is connected with the signal input end Vi and the compensating module 14, and the integrating amplifying module 11 is used for obtaining an amplified signal according to the input signal of the signal input end Vi and the feedback signal generated by the compensating module 14; the power amplification module 12 is connected with the integration amplification module 11 and is used for generating a pulse width modulation signal according to the amplified signal; the LC filter module 13 is connected with the power amplifying module 12 and the signal output end Vo, and the LC filter module 13 is used for filtering the pulse width modulation signal to generate an output signal to be output to the signal output end Vo; the compensation module 14 is further connected to the LC filter module 13 to form a feedback loop for generating a feedback signal that counteracts the pole generated by the LC filter module 13.

In the power amplifier 10 of the embodiment of the application, the integrating amplifying module 11 is connected with the signal input end Vi and the compensating module 14, the power amplifying module 12 is connected with the integrating amplifying module 11, the LC filtering module 13 is connected with the power amplifying module and the signal output end Vo, and the compensating module 14 is connected with the LC filtering module 13 to form a feedback loop, so that the LC filtering module 13 is contained in the feedback loop, the non-rational characteristic of the LC filtering module 13 can obtain the compensation of the feedback loop, the distortion of the output signal caused by the non-linearity of the output LC filtering module 13 is improved, the non-linear characteristic requirement of the LC filtering module 13 is reduced, the cost of the LC filtering module 13 is reduced, and the frequency response of the power amplifier 10 can obtain the compensation of the feedback loop, so that the pass band flatness of the power amplifier 10 is improved. In addition, since the compensation module 14 can compensate the pole of the LC filter module 13, the stability of the power amplifier 10 is increased.

The power amplifier 10 may be a class D audio power amplifier, which is a digital audio power amplifier, also referred to as a digital power amplifier. It drives the speaker by controlling the ON/OFF state of the switching unit, thereby achieving amplification of the audio signal. The class D power amplifier has the advantages of high efficiency, small volume, few peripheral components, low distortion, good frequency response curve and the like, and in addition, the class D power amplifier has the characteristics of no split noise connection, low distortion, good frequency response curve and the like, and can provide better tone quality.

Referring to fig. 1 and 2, specifically, the power amplifier 10 may include a signal input Vi, a signal output Vo, an integrating amplifying module 11, a power amplifying module 12, an LC filtering module 13, and a compensating module 14. The signal input end Vi, the integrating amplifying module 11, the power amplifying module 12, the LC filtering module 13 and the signal output end Vo are sequentially connected to form an output loop, and the compensating module 14 may be connected to the input and output of the integrating amplifying module 11 and the output of the LC filtering module 13, respectively, to form a feedback loop.

The signal input end Vi is used for providing an input signal, the input signal is an analog audio signal, the output loop is used for amplifying, modulating, filtering and the like the input signal of the signal input end Vi and the feedback signal of the feedback loop to generate an output signal and outputting the output signal to the signal output end Vo, the output signal can be an analog signal, and the signal output end Vo is used for being connected with a load so as to provide the output signal for the load.

The feedback loop (i.e. compensation module 14) is configured to generate a feedback signal from the signal output by the output loop and feed it back to the input of the output loop, wherein the feedback loop needs to set a suitable zero point so that the zero point can cancel the pole of the LC filter module 13. For example, if the LC filter module 13 has two poles, the feedback loop should be able to generate two zeros, so that the two zeros in the feedback loop can cancel the two poles of the LC filter module 13.

As can be appreciated, since the feedback loop is introduced from the output of the LC filter module 13, the nonlinear characteristic of the LC filter module 13 can obtain compensation of the feedback loop, so as to avoid up-and-down fluctuation caused by the Q value change of the LC filter module 13, ensure the flatness of the passband of the power amplifier 10, and avoid the nonlinear characteristic of the LC filter module 13 from affecting the distortion degree of the signal on the load, thereby reducing the nonlinear characteristic requirement of the LC filter module 13, and thus reducing the cost of the LC filter module 13. In addition, the zero generated by the feedback loop can offset the pole generated by the filtering module, so that the stability of the power amplifier 10 is prevented from being reduced due to the LC filtering module 13.

Further, the integrating amplifying module 11 may be an integrating amplifier, configured to obtain an amplified signal according to an input signal of the signal input terminal Vi and a feedback signal generated by the compensating module 14, the power amplifying module 12 is configured to generate a pulse width modulated signal according to the amplified signal, and the LC filtering module 13 is configured to perform a filtering process on the pulse width modulated signal to generate an output signal for outputting to the signal output terminal Vo. The compensation module 14 is configured to generate a feedback signal based on the output signal.

In addition, in order to stabilize the power amplifier 10, the compensated output loop needs to have a single-pole characteristic around the unity gain bandwidth, so the feedback loop further includes poles, and the number of zeros in the feedback signal is one more than the number of poles, and a feedforward loop filter is used between the integrating amplifying module 11 and the LC filtering module 13 so that no extra in-band pole is generated. For example, the compensation module 14 generates a signal including two zeros and one pole, where the two zeros are used to compensate the bipolar point of the LC filter module 13, and for example, the compensation module 14 generates a signal including three zeros and two poles, where the two zeros are used to compensate the bipolar point of the LC filter module 13, and the one zero and the one pole cancel, so that after the feedback signal is output to the output loop, the output loop maintains the single pole characteristic, and the stability of the power amplifier 10 is ensured.

Referring further to fig. 1, in some embodiments, the power amplifier 10 further includes a gain module 15, where the gain module 15 is connected to the LC filter module 13 and the integrating amplifier module 11, respectively, for adjusting a gain value of the power amplifier 10.

In this way, the gain of the power amplifier 10 can be adjusted by setting the gain module 15, so as to optimize the quality of the output signal of the power amplifier 10, reduce distortion and noise, and improve the signal-to-noise ratio of the output signal.

Referring to fig. 2, in some embodiments, the gain module 15 includes a first resistor R1 and a second resistor R2, where one end of the first resistor R1 is connected to the signal input terminal Vi, and the other end is connected to the integrating amplifying module 11; one end of the second resistor R2 is connected with the LC filter module 13, and the other end of the second resistor R2 is connected with the first resistor R1.

It should be noted that, the ratio of the second resistor R2 to the first resistor R1 is the gain value of the power amplifier 10, so that the gain adjustment of the power amplifier 10 can be achieved by setting the resistance values of the first resistor R1 and the second resistor R2, thereby optimizing the quality of the output signal of the power amplifier 10, reducing distortion and noise, and improving the signal-to-noise ratio of the output signal.

Referring to fig. 2, in some embodiments, the integrating amplifying module 11 includes an operational amplifier A1 and an integrating capacitor C1, where the operational amplifier A1 includes a first input terminal, a second input terminal and an output terminal, the first input terminal is connected to the first resistor R1 and the compensating module 14, the second input terminal is connected to the ground terminal, and the output terminal is connected to the power amplifying module 12; one end of the integrating capacitor C1 is connected with the first input end, and the other end of the integrating capacitor C1 is connected with the output end.

In this way, the integration amplification block 11 can eliminate the high frequency component in the signal by integrating the signal, thereby realizing the effect of signal filtering.

Referring to fig. 2, in some embodiments, the compensation module 14 includes a first compensation network 141, a second compensation network 142, and a third compensation network 143, where one end of the first compensation network 141 is connected to the LC filter module 13, and the other end of the first compensation network 141 is connected to the first input end of the operational amplifier A1; one end of the second compensation network 142 is connected with the first compensation network 141, and the other end of the second compensation network 142 is connected with the output end of the operational amplifier A1; one end of the third compensation network 143 is connected to the first compensation network 141, and the other end of the third compensation network 143 is connected to the first resistor R1.

It should be noted that the compensation network is an electronic network for compensating or adjusting the electronic system to improve its performance or eliminate the influence of some adverse factors. In the power amplifier 10, a compensation network is generally used to improve the frequency response, the phase response, etc. of the amplifier, and the compensation network is generally composed of elements such as resistors, capacitors, etc., and by adjusting parameters of these elements, adjustment and optimization of the performance of the amplifier can be achieved. In practical applications, it is necessary to select appropriate elements and structures to form the first compensation network 141, the second compensation network 142, and the third compensation network 143 according to the performance requirements and characteristics of the system, so as to achieve the best compensation effect. For example, in the present embodiment, each of the first compensation network 141, the second compensation network 142, and the third compensation network 143 includes at least one resistor and capacitor formed with an RC circuit.

In some embodiments, the LC filter module 13 includes a filter inductor L1 and a filter capacitor C2, where one end of the filter inductor L1 is connected to the power amplifying module 12, and the other end of the filter inductor L1 is connected to the signal output end Vo; one end of the filter capacitor C2 is connected with the filter inductor L1, and the other end of the filter capacitor C2 is connected with the grounding end.

Specifically, the LC filter module 13 may be an LC low-pass filter, where the LC low-pass filter includes a filter capacitor C2 and a filter inductor L1, and it should be noted that the LC low-pass filter is a passive filter based on an inductor and a capacitor, and the LC low-pass filter may filter a high-frequency signal from a circuit, and only retains a low-frequency signal. The basic principle of the LC low-pass filter is to connect a capacitor and an inductor in series to form a resonant tank. When the frequency of the input signal is equal to the resonance frequency, the impedance of the resonance circuit is minimum, the energy of the signal passing through the circuit is maximum, the resonance effect is generated, and the output signal of the filter is maximum. When the frequency of the input signal is higher than the resonance frequency, the impedance of the resonance circuit is increased, the energy of the signal is dissipated in the inductor and the capacitor, and the output signal of the filter is weakened, so that the filtering of the high-frequency signal is realized.

In this way, the LC filter module 13 is formed by the filter capacitor C2 and the filter inductor L1, so that the pwm signal generated by the power amplifier module 12 can be reduced to an analog signal, and noise outside the frequency band can be filtered.

In some embodiments, the power amplification module 12 includes a feed forward loop filter circuit.

It will be appreciated by those skilled in the art that the feed forward loop filter circuit is an advanced linearization technique that is primarily used to improve the linearity and signal quality of the power amplifier 10, and that, unlike feedback, originates in "feedback" where the output signal is processed and coupled forward to the output of the power amplifier 10. The feedforward loop filter circuit has the advantages of higher calibration precision, good stability and no bandwidth limitation. In the radio frequency working frequency band, the change of the signal can be detected in time and adjusted, so that the method is very suitable for index requirements of a multi-carrier linearization system and the like.

In some embodiments, the feedforward loop filter circuit includes an integrator I and a pulse width modulator 121, where one end of the integrator I is connected to the integrating amplifying module 11, the other end of the integrator I is connected to the pulse width modulator 121, and the pulse width modulator is further connected to the LC filter module 13.

Specifically, the plurality of integrators I may be one or more, and when the plurality of integrators I is provided, the plurality of integrators I are connected in series, the difference between the amplified signal and the pwm signal is processed by the one-stage or multi-stage integrator I, and then output to the pwm 121, the pwm signal is output from the power stage after passing through the pwm 121, and the pwm signal is fed back to the input stage and subtracted from the amplified signal to obtain a difference signal. The pwm signals may be fed back to the input stage of each integrator I, and operated with the output signal of the preceding integrator I to obtain the input signal of the next integrator I, and the amplified signals and the output signal of each integrator I may be fed forward to the input end of the pwm 121 as needed, and operated to obtain the input signal of the pwm 121.

The signal transmission characteristics of the feedforward loop filter circuit are as follows:

wherein a1-an, b1-bn, c0-cn are gain coefficients of the corresponding signals, respectively. A1=b1, b 2-bn=0 is selected for modulating and generating the output pulse width modulation signal, the signal transmission characteristic of the structure is H(s) =1, no new zero point or pole is introduced, and the stable condition of the whole output loop is satisfied.

The present application also provides an audio device comprising the power amplifier 10 of any of the above embodiments. The audio devices may include, but are not limited to, power amplifiers, speakers, multimedia consoles, digital audio consoles, audio sampling cards, synthesizers, mid-to-high frequency speakers, microphones, and the like.

In the audio device according to the embodiment of the application, the integrating amplifying module 11 is connected with the signal input end Vi and the compensating module 14, the power amplifying module 12 is connected with the integrating amplifying module 11, the LC filtering module 13 is connected with the power signal output end Vo, and the compensating module 14 is connected with the LC filtering module 13 to form a feedback loop, so that the LC filtering module 13 is included in the feedback loop, and therefore, the irrational characteristic of the LC filtering module 13 can obtain the compensation of the feedback loop, the distortion of the output signal caused by the nonlinearity of the output LC filtering module 13 is improved, the requirement on the nonlinearity characteristic of the LC filtering module 13 is reduced, the cost of the LC filtering module 13 is reduced, and the frequency response of the power amplifier 10 can obtain the compensation of the feedback loop, so that the flatness of the passband of the power amplifier 10 is improved. In addition, since the compensation module 14 can compensate the pole of the LC filter module 13, the stability of the power amplifier 10 is increased.

In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. The power amplifier is characterized by comprising an integral amplifying module, a power amplifying module, an LC filtering module and a compensation module;

The integral amplifying module is connected with the signal input end and the compensation module and is used for obtaining an amplified signal according to an input signal of the signal input end and a feedback signal generated by the compensation module;

The power amplification module is connected with the integration amplification module and is used for generating a pulse width modulation signal according to the amplified signal;

the LC filter module is connected with the power amplification module and the signal output end, and is used for filtering the pulse width modulation signal to generate an output signal so as to be output to the signal output end;

the compensation module is further connected to the integrating amplification module and the LC filter module to form a feedback loop for generating the feedback signal capable of canceling the pole of the LC filter module.

2. The power amplifier of claim 1, wherein the power amplifier further comprises:

And the gain module is respectively connected with the LC filter module and the integral amplification module and is used for adjusting the gain value of the power amplifier.

3. The power amplifier of claim 2, wherein the gain module comprises:

one end of the first resistor is connected with the signal input end, and the other end of the first resistor is connected with the integrating amplifying module;

And one end of the second resistor is connected with the LC filter module, and the other end of the second resistor is connected with the first resistor.

4. A power amplifier according to claim 3, wherein the integrating amplification module comprises:

The operational amplifier comprises a first input end, a second input end and an output end, wherein the first input end is connected with the first resistor and the compensation module, the second input end is connected with the grounding end, and the output end is connected with the power amplification module;

And one end of the integrating capacitor is connected with the first input end, and the other end of the integrating capacitor is connected with the output end.

5. The power amplifier of claim 4, wherein the compensation module comprises:

One end of the first compensation network is connected with the LC filter module, and the other end of the first compensation network is connected with the first input end of the operational amplifier;

one end of the second compensation network is connected with the first compensation network, and the other end of the second compensation network is connected with the output end of the operational amplifier;

and one end of the third compensation network is connected with the first compensation network, and the other end of the third compensation network is connected with the first resistor.

6. The power amplifier of claim 1, wherein the LC filter module comprises:

One end of the filter inductor is connected with the power amplification module, and the other end of the filter inductor is connected with the signal output end;

And one end of the filter capacitor is connected with the filter inductor, and the other end of the filter capacitor is connected with the grounding end.

7. The power amplifier of claim 1, wherein the power amplification module comprises a feed forward loop filter amplification circuit.

8. The power amplifier of claim 7, wherein the feed forward loop filter amplification circuit comprises:

one end of the integrator is connected with the integrating amplifying module;

And the pulse width modulator is connected with the other end of the integrator and the LC filter module.

9. An audio device comprising the power amplifier of any of claims 1-8.