CN109068237A - A kind of digital audio power amplification system - Google Patents
A kind of digital audio power amplification system Download PDFInfo
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- CN109068237A CN109068237A CN201810979127.0A CN201810979127A CN109068237A CN 109068237 A CN109068237 A CN 109068237A CN 201810979127 A CN201810979127 A CN 201810979127A CN 109068237 A CN109068237 A CN 109068237A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The present invention provides a kind of digital audio power amplification systems, including the first subsystem, the first division module and the first gain adjustment module；The digital audio power amplification system passes through the first division module of setting, in the case where guaranteeing the first subsystem output high pressure, the high-voltage signal for feeding back to the first subsystem is subjected to voltage division processing, so that the internal circuit of the first subsystem can work normally, and then digital audio power amplification system is made to have the function of High voltage output.Also, it is realized by the first gain adjustment module of setting and gain adjustment is carried out to the output signal of first subsystem, and then gain adjustment is carried out to the output signal of digital audio power amplification system.
Description
Technical field
The present invention relates to semiconductor integrated circuit technology fields, more specifically to a kind of digital audio power amplification system.
Background technique
D-type audio power amplifier is widely applied since it is more than 80% efficiency at present, especially efficiently
Rate is most important for mobile device, can not only lengthen working hours, and can also reduce the calorific value of the handheld devices such as mobile phone.
In application fields such as mobile phones, volume and sound quality can have an important influence on user experience, and current trend is audio
Power amplifier exports higher power to obtain bigger volume and preferable sound quality.
But digital audio power amplification system can not support High voltage output, and the gain of digital audio power amplification system at present
It can not adjust.
Summary of the invention
To solve the above problems, can support High voltage output, and have the present invention provides a kind of digital audio power amplification system
There is gain adjustment function.
To achieve the above object, the invention provides the following technical scheme:
A kind of digital audio power amplification system, comprising: the first subsystem, the first division module and the first gain adjustment module；
First subsystem includes: the first current source module and the first power amplifier loop, first current source module
Output end is connect with the first input end of the first power amplifier loop, and the input terminal of first current source module is as described
The signal input part of one subsystem, for receiving PWMP signal, the output end of the first power amplifier loop is as first son
The output end of system；
The first end of first division module is connect with the output end of first subsystem, first division module
Second end connect with the first end of first gain adjustment module, the second end of first gain adjustment module with it is described
The first input end of first power amplifier loop connects；
The voltage that first division module is used to feed back to first subsystem carries out voltage division processing；
First gain adjustment module is used to carry out gain adjustment to the output signal of first subsystem, and then right
The output signal of digital audio power amplification system carries out gain adjustment.
Preferably, first division module, comprising: first resistor and second resistance；
The first end of the first resistor is connect with the output end of first subsystem, the second end of the first resistor
It is connect with the first end of the second resistance, the second end grounding connection of the second resistance；
Second end of the connecting node of the first resistor and the second resistance as first division module.
Preferably, the resistance value of the second resistance is twice of the resistance value of the first resistor.
Preferably, first gain adjustment module, comprising: the first feedback resistance, the second feedback resistance and switch；
The first end of first feedback resistance is connect with the second end of first division module, the first feedback electricity
The second end of resistance is connect with the first end of second feedback resistance, the second end of second feedback resistance and first function
Put the first input end connection of loop；
The first end of the switch is connect with the connecting node of first feedback resistance and second feedback resistance, institute
The second end for stating switch is connect with the second end of second feedback resistance；
The control terminal of the switch is for receiving first control signal, and the first control signal is for controlling the switch
Switch state, and then to the output signal of first subsystem carry out gain adjustment；
Second end of the connecting node of the switch and second feedback resistance as first gain adjustment module.
Preferably, the switch, comprising: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor and third metal-oxide-semiconductor；
The drain electrode of first metal-oxide-semiconductor connects with the connecting node of first feedback resistance and second feedback resistance
It connects；
The source electrode of first metal-oxide-semiconductor is connect with the source electrode of second metal-oxide-semiconductor；
The drain electrode of second metal-oxide-semiconductor is connect with the second end of second feedback resistance；
The grid of first metal-oxide-semiconductor is connect with the grid of second metal-oxide-semiconductor, for receiving the first control letter
Number；
The drain electrode of the third metal-oxide-semiconductor is connect with the source electrode of first metal-oxide-semiconductor, the source electrode ground connection of the third metal-oxide-semiconductor
Connection, the grid of the third metal-oxide-semiconductor is for receiving second control signal, and the second control signal is for controlling the third
The working condition of metal-oxide-semiconductor.
Preferably, first metal-oxide-semiconductor, second metal-oxide-semiconductor and the third metal-oxide-semiconductor are N-type metal-oxide-semiconductor.
Preferably, the digital audio power amplification system, further includes: common-mode voltage generation module；
Second input terminal of the second input terminal of the first power amplifier loop and the second power amplifier loop with it is described total
The output end of mode voltage generation module connects.
Preferably, the common-mode voltage generation module, comprising: 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance
And capacitor；
The first end of the 3rd resistor is connect with voltage input end, the second end of the 3rd resistor and the 4th electricity
The first end of resistance connects, and the second end of the 4th resistance is connect with the first end of the 5th resistance, the 5th resistance
Second end grounding connection；
The first end of 6th resistance is connect with the first end of the 5th resistance, the second end of the 6th resistance with
The first end of the capacitor connects, and the second end of the capacitor is connect with the second end of the 5th resistance；
Output end of the connecting node of 6th resistance and the capacitor as the common-mode voltage generation module.
Preferably, the 3rd resistor, the 4th resistance are identical with the resistance value of the 5th resistance.
Preferably, the digital audio power amplification system, further includes: the second subsystem, the second division module and the second gain
Adjustment module；
Second subsystem is identical with the circuit structure of first subsystem, the signal input of second subsystem
For receiving PWMN signal, the PWMN signal is identical with the period of the PWMP signal at end, and timing is different；
The first end of second division module is connect with the output end of second subsystem, second division module
Second end connect with the first end of second gain adjustment module, the second end of second gain adjustment module with it is described
The first input end of the second power amplifier loop in second subsystem connects；
Second division module is identical with the circuit structure of first division module, and second division module is used for
The voltage for feeding back to second subsystem is subjected to voltage division processing；
Second gain adjustment module is identical with the circuit structure of first gain adjustment module, second gain
Adjustment module is used to carry out gain adjustment to the output signal of second subsystem, and then to the defeated of digital audio power amplification system
Signal carries out gain adjustment out.
As can be seen from the above description, a kind of digital audio power amplification system provided by the invention passes through setting the first partial pressure mould
The high-voltage signal for feeding back to the first subsystem is carried out voltage division processing in the case where guaranteeing the first subsystem output high pressure by block,
So that the internal circuit of the first subsystem can work normally, and then digital audio power amplification system is made to have the function of High voltage output.
Also, it is realized by the first gain adjustment module of setting and gain tune is carried out to the output signal of first subsystem
Section, and then gain adjustment is carried out to the output signal of digital audio power amplification system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of digital power amplifier system provided in an embodiment of the present invention；
Fig. 2 is another structural schematic diagram of digital power amplifier system provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of switch provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of common-mode voltage generation module provided in an embodiment of the present invention；
Fig. 5 is the waveform diagram of first capacitor charge and discharge provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 1, Fig. 1 is the structural schematic diagram of digital power amplifier system provided in an embodiment of the present invention, and effect will be digital
Pwm signal after resume module is converted into analog signal, comprising: the first subsystem, the first division module 13, the first gain adjustment
Module 14, the second subsystem, the second division module 17 and the second gain adjustment module 18；
Wherein, first subsystem is identical with the circuit structure of second subsystem, first division module 13
It is identical with the circuit structure of second division module 17, first gain adjustment module 14 and the second gain adjustment mould
The circuit structure of block 18 is identical.
First subsystem includes: the first current source module 11 and the first power amplifier loop 12, the first current source mould
The output end Vip of block 11 is connect with the first input end of the first power amplifier loop 12, first current source module 1112
Signal input part of the input terminal as first subsystem, for receiving PWMP signal, the first power amplifier loop 12 it is defeated
Output end VOP of the outlet as first subsystem；
The first end of first division module 13 is connect with the output end VOP of first subsystem, and described first point
The second end of die block 13 is connect with the first end of first gain adjustment module 14, first gain adjustment module 14
Second end is connect with the first input end of the first power amplifier loop 12；
The voltage that first division module 13 is used to feed back to first subsystem carries out voltage division processing；
First gain adjustment module 14 is used to carry out gain adjustment to the output signal of first subsystem.
Second subsystem includes: the second current source module 15 and the second power amplifier loop 16, the second current source mould
The output end Vin of block 15 is connect with the first input end of the second power amplifier loop 16, second current source module 15 it is defeated
Enter signal input part of the end as second subsystem, for receiving PWMN signal, the output of the second power amplifier loop 16
Hold the output end VON as second subsystem；
The first end of second division module 17 is connect with the output end VON of second subsystem, and described second point
The second end of die block 17 is connect with the first end of second gain adjustment module 18, second gain adjustment module 18
Second end is connect with the first input end of the second power amplifier loop 16；
The voltage that second division module 17 is used to feed back to second subsystem carries out voltage division processing；
Second gain adjustment module 18 is used to carry out gain adjustment to the output signal of second subsystem.
It should be noted that the PWMP signal is identical with the period of the PWMN signal, and timing is different.
As can be seen from the above description, which is guaranteeing the first son by the first division module of setting
In the case that system exports high pressure, the high-voltage signal for feeding back to the first subsystem is subjected to voltage division processing, so that the first subsystem
Internal circuit can work normally, and then digital audio power amplification system is made to have the function of High voltage output.
Also, it is realized by the first gain adjustment module of setting and gain tune is carried out to the output signal of first subsystem
Section, and then gain adjustment is carried out to the output signal of digital audio power amplification system.
Similarly, by the way that the second division module is arranged, in the case where guaranteeing the second subsystem output high pressure, the will be fed back to
The high-voltage signal of two subsystems carries out voltage division processing, so that the internal circuit of the second subsystem can work normally, and then makes to count
Word audio power amplification system has the function of High voltage output.
Also, it is realized by the second gain adjustment module of setting and gain tune is carried out to the output signal of second subsystem
Section, and then gain adjustment is carried out to the output signal of digital audio power amplification system.
Further, as shown in Figure 1, the digital audio power amplification system, further includes: common-mode voltage generation module 19；
Second input terminal of the second input terminal of the first power amplifier loop 12 and the second power amplifier loop 16 is and institute
State the output end VREF connection of common-mode voltage generation module 19.
The common-mode voltage generation module 19 is for generating common mode voltage signal, for maintaining first current source module
22 and second current source module 26 output signal stability.
Further, as shown in Fig. 2, first current source module 22 includes the first current source IDAC1, the second current source
IDAC2, switch A and switch B.
The input terminal and power supply of first current source IDAC1 for pressure side VDD connection, the output end of the first current source IDAC1 with
The input terminal of switch A connects, and the output end of switch A is connect with the input terminal of switch B, and the output end of switch B passes through the second electric current
Input terminal of the control terminal of source IDAC2 grounding connection, switch A and switch B as first current source module 11, for receiving
PWMP signal.
Further, as shown in Fig. 2, the first power amplifier loop 12 includes the first operational amplifier 21, the drive of power amplifier loop
Dynamic model block 23, first capacitor C1, the first field-effect tube P1 and the second field-effect tube N1；
The inverting input terminal of first operational amplifier 21 is connect with the output end of first current source module 11, the first fortune
The non-inverting input terminal for calculating amplifier 21 is connect with the output end of common-mode voltage generation module 19, the output of the first operational amplifier 21
End is connect with the input terminal of the power amplifier loop drive module 23, the first output end of the power amplifier loop drive module 23 and institute
State the grid connection of the first field-effect tube P1, the second output terminal and second field-effect of the power amplifier loop drive module 23
The grid of pipe N1 connects.
The source electrode of the first field-effect tube P1 is connect with voltage input end PVDD, the drain electrode of the first field-effect tube P1
It is connect with the drain electrode of the second field-effect tube N1, the source electrode grounding connection of the second field-effect tube N1, first effect
Should pipe P1 and the second field-effect tube N1 output end of the connecting node as the first power amplifier loop 12.
The first end of the first capacitor C1 is connect with the output end of first operational amplifier 21, second end with it is described
The inverting input terminal of first operational amplifier 21 connects.
Further, as shown in Fig. 2, second current source module 15 includes third current source IDAC3, the 4th current source
IDAC4, switch C and switch D.
The input terminal and power supply of third current source IDAC3 for pressure side VDD connection, the output end of third current source IDAC3 with
The input terminal of switch C connects, and the output end of switch C is connect with the input terminal of switch D, and the output end of switch D passes through the 4th electric current
Input terminal of the control terminal of source IDAC4 grounding connection, switch C and switch D as second current source module, for receiving
PWMN signal.
Further, as shown in Fig. 2, the second power amplifier loop 16 includes second operational amplifier 22, the drive of power amplifier loop
Dynamic model block 24, the second capacitor C2, third field-effect tube P2 and the 4th field-effect tube N2；
The inverting input terminal of second operational amplifier 22 is connect with the output end of second current source module 15, the second fortune
The non-inverting input terminal for calculating amplifier 22 is connect with the output end of common-mode voltage generation module 19, the output of second operational amplifier 22
End is connect with the input terminal of the power amplifier loop drive module 24, the first output end of the power amplifier loop drive module 24 and institute
State the grid connection of third field-effect tube P2, the second output terminal and the 4th field-effect of the power amplifier loop drive module 24
The grid of pipe N2 connects.
The source electrode of the third field-effect tube P2 is connect with voltage input end PVDD, the drain electrode of the third field-effect tube P2
It is connect with the drain electrode of the 4th field-effect tube N2, the source electrode grounding connection of the 4th field-effect tube N2, the third field effect
Should pipe P2 and the 4th field-effect tube N2 output end of the connecting node as the second power amplifier loop 16.
The first end of the second capacitor C2 is connect with the output end of the second operational amplifier 22, second end with it is described
The inverting input terminal of second operational amplifier 22 connects.
Since first subsystem is identical with the circuit structure of second subsystem, first division module and institute
The circuit structure for stating the second division module is identical, the circuit of first gain adjustment module and second gain adjustment module
Structure is identical, therefore, is illustrated below with the first subsystem, the first division module and the first gain adjustment module.
Further, as shown in Fig. 2, first division module 13, comprising: first resistor R1 and second resistance R2；
The first end of the first resistor R1 is connect with the output end VOP of first subsystem, the first resistor R1
Second end connect with the first end of the second resistance R2, the second end grounding connection of the second resistance R2；
The connecting node of the first resistor R1 and the second resistance R2 as first division module 13 second
End.
Optionally, the resistance value of the second resistance R2 is twice of the resistance value of the first resistor R1.
In the present embodiment, by adding first resistor R1 and second resistance R2, such as the resistance of the second resistance R2
Value is twice of the resistance value of the first resistor R1, and the voltage of the second end of the first division module 13 is up to voltage input at this time
2/3 times for holding PVDD, then the voltage VREF of the second input terminal of the first power amplifier loop 12 becomes the 1/3 of voltage input end PVDD
Times, that is to say, that when voltage input end PVDD is 10V, the voltage of VREF is 3.33V, in the first current source module 11 and the
When the supply voltage of one power amplifier loop 12 is equal in the case where 5V, the circuit structure of the first subsystem remains to work normally.
In turn, which has the function of High voltage output.
Further, as shown in Fig. 2, first gain adjustment module 14, comprising: the first feedback resistance RF1, second are instead
Feed resistance RF2 and switch S；
The first end of the first feedback resistance RF1 is connect with the second end of first division module 13, and described first
The second end of feedback resistance RF1 is connect with the first end of the second feedback resistance RF2, and the of the second feedback resistance RF2
Two ends are connect with the first input end of the first power amplifier loop 12；
The connecting node of the first end of the switch S and the first feedback resistance RF1 and the second feedback resistance RF2
Connection, the second end of the switch S are connect with the second end of the second feedback resistance RF2；
The control terminal of the switch S is for receiving first control signal, and the first control signal is for controlling described open
The switch state of S is closed, and then gain adjustment is carried out to the output signal VOP of first subsystem.
The connecting node of the switch S and the second feedback resistance RF2 are as first gain adjustment module 14
Second end.
Further, as shown in figure 3, the switch S, comprising: the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 and third metal-oxide-semiconductor
M3；
The drain electrode V of the first metal-oxide-semiconductor M1HIWith the company of the first feedback resistance RF1 and the second feedback resistance RF2
Connect node connection；
The source electrode of the first metal-oxide-semiconductor M1 is connect with the source electrode of the second metal-oxide-semiconductor M2；
The drain electrode V of the second metal-oxide-semiconductor M2LOIt is connect with the second end of the second feedback resistance RF2；
The grid of first metal-oxide-semiconductor is connect with the grid of second metal-oxide-semiconductor, for receiving the first control signal
EN；
The drain electrode of the third metal-oxide-semiconductor M3 is connect with the source electrode of the first metal-oxide-semiconductor M1, the source of the third metal-oxide-semiconductor M3
Pole grounding connection, the grid of the third metal-oxide-semiconductor M3 are used for receiving second control signal ENN, the second control signal ENN
In the working condition for controlling the third metal-oxide-semiconductor M3.
Optionally, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 and the third metal-oxide-semiconductor M3 are N-type metal-oxide-semiconductor.
The first metal-oxide-semiconductor M1 is high-pressure N-shaped metal-oxide-semiconductor, and the second metal-oxide-semiconductor M2 is isolating n-type metal-oxide-semiconductor, when the voltage of PVDD
When for 10V, the ceiling voltage of the second end of the first division module 13 is 6.67V, and the first metal-oxide-semiconductor M1 is asymmetric high-pressure N-shaped MOS
Pipe, drain VHIIt can bear high voltage.The drain electrode V of second metal-oxide-semiconductor M2LOConnect the second of the second feedback resistance RF2
End, to eliminate body bias effect, subtracts at this point, the substrate of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 link together with its source electrode
The threshold voltage of few metal-oxide-semiconductor guarantees that PVDD first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 when lower can work in linear zone, obtains
Lesser conducting resistance.
Further, as shown in figure 4, the common-mode voltage generation module 19, comprising: 3rd resistor R3, the 4th resistance R4,
5th resistance R5, the 6th resistance R6 and capacitor C；
The first end of the 3rd resistor R3 is connect with voltage input end PVDD, the second end of the 3rd resistor R3 and institute
The first end connection of the 4th resistance R4 is stated, the second end of the 4th resistance R4 is connect with the first end of the 5th resistance R5,
The second end grounding connection of the 5th resistance R5；
The first end of the 6th resistance R6 is connect with the first end of the 5th resistance R5, and the of the 6th resistance R6
Two ends are connect with the first end of the capacitor C, and the second end of the capacitor C is connect with the second end of the 5th resistance R5；
Output of the connecting node of the 6th resistance R6 and capacitor C as the common-mode voltage generation module 19
End.
Optionally, the 3rd resistor R3, the 4th resistance R4 are identical with the resistance value of the 5th resistance R5.
Based on the digital audio power amplification system of above-mentioned offer, its principle with gain adjustment function is explained below
It states.
It is illustrated by taking the first subsystem, the first division module and the first gain adjustment module as an example.
Assuming that switch S is on state, pass through the relationship between analysis input duty cycle and output signal, it is found that
As shown in figure 5, charge and discharge of the first capacitor C1 within a PWMP period are divided into 4 stages.
In the T1 stage: PWMP=" 1 " is high level, and VOP=" 1 " is high level, and the first current source IDAC1 is to the first electricity
Hold C1 charging, the output end VOP of the first subsystem passes through the first feedback resistance RF1It charges to first capacitor C1, at this time first capacitor
The electric current of C1 are as follows:
In the T2 stage: PWMP=" 1 " is high level, and VOP=" 0 " is low level, and the first current source IDAC1 is to the first electricity
Hold C1 charging, the output end VOP of the first subsystem passes through the first feedback resistance RF1It discharges to first capacitor C1, at this time first capacitor
The electric current of C1 are as follows:
In the T3 stage: PWMP=" 0 " is low level, and VOP=" 0 " is low level, and the second current source IDAC2 is to the first electricity
Hold C1 electric discharge, the output end VOP of the first subsystem passes through the first feedback resistance RF1It discharges to first capacitor C1, at this time first capacitor
The electric current of C1 are as follows:
In the T4 stage: PWMP=" 0 " is low level, and VOP=" 1 " is high level, and the second current source IDAC2 is to the first electricity
Hold C1 electric discharge, the output end VOP of the first subsystem passes through the first feedback resistance RF1It charges to first capacitor C1, at this time first capacitor
The electric current of C1 are as follows:
Due in the first subsystem course of normal operation, the charge and discharge electric equilibrium of first capacitor C1, that is,
IC1_T1×t1+IC1_T2× t2=-IC1_T3×t3-IC1_T4×t4
Wherein, t1, t2, t3, t4 are respectively the time for being in each stage, IDACFor the electricity of the first current source IDAC1 and second
The electric current of stream source IDAC2.
It can be obtained by arranging above-mentioned formula,
Wherein, t1+t2=DIN× T, t3+t4=(1-DIN) × T, t1+t4=DOUT× T, t2+t3=(1-DOUT)×T
Wherein, DINFor the duty ratio of PWMP, DOUTFor the duty ratio of VOP, T is the period of PWMP and VOP.
Arrangement can obtain,
It follows that
The output voltage V of so the first subsystemOUTPAre as follows:
VOUTP=DOUT×PVDD
That is,
By the above formula, VOUTPBe one withFor common-mode point, 50% input duty cycle DINCentered on
Signal.
The output voltage V of second subsystem known to similarlyOUTN, no longer illustrate herein.
So, total output voltage V of digital audio power amplification systemOUTFor,
VOUT=VOUTP-VOUTN
That is,
VOUT=3 × RF1×IDAC(2×DIN-1)
It follows that the gain of digital audio power amplification system is 3 × RF1×IDAC。
When switch S is in OFF state, due to the second feedback resistance RF2Circuit structure is added, at this time digital audio-power amplifier
The gain of system is 3 × (RF1+RF2)×IDAC。
As can be seen from the above description, which can carry out gain adjustment to its output signal.
A kind of digital audio power amplification system provided by the present invention is described in detail above, tool used herein
Principle and implementation of the present invention are described for body example, the above embodiments are only used to help understand this hair
Bright method and its core concept；At the same time, for those skilled in the art, according to the thought of the present invention, specific real
Apply in mode and application range that there will be changes, in conclusion the content of the present specification should not be construed as to limit of the invention
System.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, phase
Place is closed referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the element that the process, method, article or equipment including a series of elements is intrinsic,
It further include either the element intrinsic for these process, method, article or equipments.In the absence of more restrictions,
The element limited by sentence "including a ...", it is not excluded that in the process, method, article or equipment including the element
In there is also other identical elements.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of digital audio power amplification system characterized by comprising the first subsystem, the first division module and the first gain
Adjustment module；
First subsystem includes: the first current source module and the first power amplifier loop, the output of first current source module
End is connect with the first input end of the first power amplifier loop, and the input terminal of first current source module is as first son
The signal input part of system, for receiving PWMP signal, the output end of the first power amplifier loop is as first subsystem
Output end；
The first end of first division module is connect with the output end of first subsystem, and the of first division module
Two ends are connect with the first end of first gain adjustment module, the second end of first gain adjustment module and described first
The first input end of power amplifier loop connects；
The voltage that first division module is used to feed back to first subsystem carries out voltage division processing；
First gain adjustment module is used to carry out gain adjustment to the output signal of first subsystem, and then to number
The output signal of audio power amplification system carries out gain adjustment.
2. digital audio power amplification system according to claim 1, which is characterized in that first division module, comprising: the
One resistance and second resistance；
The first end of the first resistor is connect with the output end of first subsystem, the second end of the first resistor and institute
State the first end connection of second resistance, the second end grounding connection of the second resistance；
Second end of the connecting node of the first resistor and the second resistance as first division module.
3. digital audio power amplification system according to claim 1, which is characterized in that the resistance value of the second resistance is described
Twice of the resistance value of first resistor.
4. digital audio power amplification system according to claim 1, which is characterized in that first gain adjustment module, packet
It includes: the first feedback resistance, the second feedback resistance and switch；
The first end of first feedback resistance is connect with the second end of first division module, first feedback resistance
Second end is connect with the first end of second feedback resistance, the second end of second feedback resistance and the first power amplifier ring
The first input end on road connects；
The first end of the switch is connect with the connecting node of first feedback resistance and second feedback resistance, described to open
The second end of pass is connect with the second end of second feedback resistance；
The control terminal of the switch is for receiving first control signal, and the first control signal is for controlling opening for the switch
Off status, and then gain adjustment is carried out to the output signal of first subsystem；
Second end of the connecting node of the switch and second feedback resistance as first gain adjustment module.
5. digital audio power amplification system according to claim 4, which is characterized in that the switch, comprising: the first metal-oxide-semiconductor,
Second metal-oxide-semiconductor and third metal-oxide-semiconductor；
The drain electrode of first metal-oxide-semiconductor is connect with the connecting node of first feedback resistance and second feedback resistance；
The source electrode of first metal-oxide-semiconductor is connect with the source electrode of second metal-oxide-semiconductor；
The drain electrode of second metal-oxide-semiconductor is connect with the second end of second feedback resistance；
The grid of first metal-oxide-semiconductor is connect with the grid of second metal-oxide-semiconductor, for receiving the first control signal；
The drain electrode of the third metal-oxide-semiconductor is connect with the source electrode of first metal-oxide-semiconductor, the source electrode grounding connection of the third metal-oxide-semiconductor,
The grid of the third metal-oxide-semiconductor is for receiving second control signal, and the second control signal is for controlling the third metal-oxide-semiconductor
Working condition.
6. digital audio power amplification system according to claim 5, which is characterized in that first metal-oxide-semiconductor, described second
Metal-oxide-semiconductor and the third metal-oxide-semiconductor are N-type metal-oxide-semiconductor.
7. digital audio power amplification system according to claim 1, which is characterized in that the digital audio power amplification system, also
It include: common-mode voltage generation module；
Second input terminal of the second input terminal of the first power amplifier loop and the second power amplifier loop is electric with the common mode
Press the output end connection of generation module.
8. digital audio power amplification system according to claim 7, which is characterized in that the common-mode voltage generation module, packet
It includes: 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and capacitor；
The first end of the 3rd resistor is connect with voltage input end, the second end of the 3rd resistor and the 4th resistance
First end connection, the second end of the 4th resistance are connect with the first end of the 5th resistance, and the second of the 5th resistance
Hold grounding connection；
The first end of 6th resistance is connect with the first end of the 5th resistance, the second end of the 6th resistance with it is described
The first end of capacitor connects, and the second end of the capacitor is connect with the second end of the 5th resistance；
Output end of the connecting node of 6th resistance and the capacitor as the common-mode voltage generation module.
9. digital audio power amplification system according to claim 8, which is characterized in that the 3rd resistor, the 4th electricity
It hinders identical with the resistance value of the 5th resistance.
10. digital audio power amplification system according to claim 1, which is characterized in that the digital audio power amplification system, also
It include: the second subsystem, the second division module and the second gain adjustment module；
Second subsystem is identical with the circuit structure of first subsystem, and the signal input part of second subsystem is used
In receiving PWMN signal, the PWMN signal is identical with the period of the PWMP signal, and timing is different；
The first end of second division module is connect with the output end of second subsystem, and the of second division module
Two ends are connect with the first end of second gain adjustment module, the second end of second gain adjustment module and described second
The first input end of the second power amplifier loop in subsystem connects；
Second division module is identical with the circuit structure of first division module, and second division module is used for will be anti-
The voltage for being fed to second subsystem carries out voltage division processing；
Second gain adjustment module is identical with the circuit structure of first gain adjustment module, second gain adjustment
Module is used to carry out gain adjustment to the output signal of second subsystem, and then believes the output of digital audio power amplification system
Number carry out gain adjustment.
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