CN208540147U - A kind of digital audio power amplification system - Google Patents
A kind of digital audio power amplification system Download PDFInfo
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Abstract
The utility model provides a kind of digital audio power amplification system, comprising: the first subsystem, the second subsystem, feedback module and adjustment module；The digital audio power amplification system passes through setting feedback module and adjustment module, in conjunction with control signal, so that the adjustment module is in different working conditions, to adjust the resistors match degree of first subsystem and second subsystem, and then the power supply rejection ratio of the digital audio power amplification system is adjusted, to eliminate the noise on loudspeaker.
Description
Technical field
The utility model relates to semiconductor integrated circuit technology fields, more specifically to a kind of digital audio-power amplifier
System.
Background technique
Preceding D-type audio power amplifier is widely applied since it is more than 80% efficiency, especially high efficiency
It is most important for mobile device, it can not only lengthen working hours, the calorific value of the handheld devices such as mobile phone can also be reduced.
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 is at present in order to export higher transmission power, it is necessary to extract from power supply a large amount of
Electric current, due to power supply have certain internal resistance, cause ceaselessly occur fluctuating on a large scale on power supply, that is, be unable to control electricity
Source inhibits ratio, and then biggish noise can be heard on loudspeaker.
Utility model content
To solve the above problems, the utility model provides a kind of digital audio power amplification system, the digital audio-power amplifier system
System can be adjusted power supply rejection ratio, to eliminate the noise on loudspeaker.
To achieve the above object, the utility model provides the following technical solutions:
A kind of digital audio power amplification system, comprising: the first subsystem, the second subsystem, feedback module and 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；
Second subsystem includes: the second current source module and the second power amplifier loop, second current source module
Output end is connect with the first input end of the second power amplifier loop, and the input terminal of second current source module is as described
The signal input part of two subsystems, for receiving PWMN signal, the output end of the second power amplifier loop is as second son
The output end of system；
The first input end of the feedback module is connect with the first input end of the first power amplifier loop, the feedback mould
Second input terminal of block is connect with the first input end of the second power amplifier loop, the first output end of the feedback module and institute
State the first input end connection of adjustment module, the second input terminal of the second output terminal of the feedback module and the adjustment module
Connection；
First output end of the adjustment module is connect with the output end of the first power amplifier loop, the adjustment module
Second output terminal is connect with the output end of the second power amplifier loop；
The control terminal of the adjustment module is for receiving control signal, and the control signal is for controlling the adjustment module
In different working conditions, to adjust the resistors match degree of first subsystem and second subsystem, and then adjust
Save the power supply rejection ratio of the digital audio power amplification system；
The control signal, the PWMP signal are identical with the period of the PWMN signal.
Preferably, the feedback module, comprising: the first feedback resistance and the second feedback resistance；
The first end of first feedback resistance is connect with the first input end of the first power amplifier loop, second end and institute
State the first input end connection of adjustment module；
The first end of second feedback resistance is connect with the first input end of the second power amplifier loop, second end and institute
State the second input terminal connection of adjustment module.
Preferably, the adjustment module, comprising: first resistor, second resistance, 3rd resistor, the 4th resistance, first open
Pass, second switch, third switch, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch；
The input terminal of the input terminal of the first switch and the second switch is exported with the first of the feedback module
End connection；
Output of the output end of the output end of the third switch and the 4th switch with the first power amplifier loop
End connection；
Second output of the input terminal of the input terminal of 5th switch and the 6th switch with the feedback module
End connection；
Output of the output end of the output end of 7th switch and the 8th switch with the second power amplifier loop
End connection；
The output end of the output end of the first switch and the 5th switch connects with the first end of the first resistor
It connects, the second end of the first resistor is connect with the input terminal of the input terminal of third switch and the 7th switch respectively；
The first end of the second resistance is connect with the first end of the first resistor, and the second end of second resistance, which is grounded, to be connected
It connects；
The output end of the output end of the second switch and the 6th switch connects with the first end of the 3rd resistor
It connects, the second end of the 3rd resistor is connect with the input terminal of the input terminal of the 4th switch and the 8th switch respectively；
The first end of 4th resistance is connect with the first end of the 3rd resistor, the second termination of the 4th resistance
Ground connection；
The first switch, the second switch, third switch, the 4th switch, the described 5th switch, are described
The control terminal of 6th switch, the 7th switch and the 8th switch is for receiving the control signal, the control signal
For control the first switch, the second switch, the third switch, it is described 4th switch, it is described 5th switch, it is described
The working condition of 6th switch, the 7th switch and the 8th switch；
When the first switch, third switch, the 6th switch and the 8th switch in the conductive state,
Rest switch is in close state；
When the second switch, the 4th switch, the 5th switch and the 7th switch in the conductive state,
Rest switch is in close state.
Preferably, the first switch, the second switch, third switch, the 4th switch, the described 5th open
It closes, the 6th switch, the 7th switch and the 8th switch are field-effect tube.
Preferably, the first switch, third switch, the 6th switch and the 8th switch are p-type field
Effect pipe；
The second switch, the 4th switch, the 5th switch and the 7th switch are N-type field-effect tube.
Preferably, the first switch, third switch, the 6th switch and the 8th switch are N-type field
Effect pipe；
The second switch, the 4th switch, the 5th switch and the 7th switch are p-type field-effect tube.
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: the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance
And capacitor；
The first end of 5th resistance is connect with voltage input end, the second end of the 5th resistance and the 6th electricity
The first end of resistance connects, and the second end of the 6th resistance is connect with the first end of the 7th resistance, the 7th resistance
Second end grounding connection；
The first end of 8th resistance is connect with the first end of the 7th resistance, the second end of the 8th resistance with
The first end of the capacitor connects, and the second end of the capacitor is connect with the second end of the 7th resistance；
Output end of the connecting node of 8th resistance and the capacitor as the common-mode voltage generation module.
As can be seen from the above description, a kind of digital audio power amplification system provided by the utility model passes through setting feedback module
And adjustment module, in conjunction with control signal, so that the adjustment module is in different working conditions, to adjust first subsystem
The resistors match degree of system and second subsystem, and then the power supply rejection ratio of the digital audio power amplification system is adjusted, with
Eliminate the noise on loudspeaker.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the structural schematic diagram of digital power amplifier system provided by the embodiment of the utility model；
Fig. 2 is another structural schematic diagram of digital power amplifier system provided by the embodiment of the utility model；
Fig. 3 is the structural schematic diagram of common-mode voltage generation module provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
With reference to Fig. 1, Fig. 1 is the structural schematic diagram of digital power amplifier system provided by the embodiment of the utility model, and effect will
Treated that pwm signal is converted into analog signal, the digital power amplifier system for digital module, comprising: the first subsystem, the second son
System, feedback module 15 and adjustment module 16；
First subsystem includes: the first current source module 11 and the first power amplifier loop 12, the first current source mould
The output end of block 11 is connect with the first input end of the first power amplifier loop 12, the input terminal of first current source module 11
As the signal input part of first subsystem, for receiving PWMP signal, the output end of the first power amplifier loop 12 is made
For the output end VOUTP of first subsystem；
Second subsystem includes: the second current source module 13 and the second power amplifier loop 14, the second current source mould
The output end of block 13 is connect with the first input end of the second power amplifier loop 14, the input terminal of second current source module 13
As the signal input part of second subsystem, for receiving PWMN signal, the output end of the second power amplifier loop 14 is made
For the output end VOUTN of second subsystem；
The first input end of the feedback module 15 is connect with the first input end of the first power amplifier loop 12, described anti-
Second input terminal of feedback module 15 is connect with the first input end of the second power amplifier loop 14, and the first of the feedback module 15
Output end is connect with the first input end of the adjustment module 16, the second output terminal of the feedback module 15 and the adjusting mould
Second input terminal of block 16 connects；
First output end of the adjustment module 16 is connect with the output end of the first power amplifier loop 12, the adjusting mould
The second output terminal of block 16 is connect with the output end of the second power amplifier loop 14；
The control terminal of the adjustment module 16 is for receiving control signal SWAP, the control signal SWAP for controlling institute
It states adjustment module 16 and is in different working conditions, to adjust the resistors match of first subsystem and second subsystem
Degree, and then adjust the power supply rejection ratio of the digital audio power amplification system；
The control signal SWAP, the PWMP signal are identical with the period of the PWMN signal.
As can be seen from the above description, a kind of digital audio power amplification system provided by the utility model passes through setting feedback module
And adjustment module, in conjunction with control signal, so that the adjustment module is in different working conditions, to adjust first subsystem
The resistors match degree of system and second subsystem, and then the power supply rejection ratio of the digital audio power amplification system is adjusted, with
Eliminate the noise on loudspeaker.
Further, as shown in Figure 1, the digital audio power amplification system, further includes: common-mode voltage generation module 17；
Second input terminal of the second input terminal of the first power amplifier loop 12 and the second power amplifier loop 14 is and institute
State the output end VREF connection of common-mode voltage generation module 17.
The common-mode voltage generation module 17 is for generating common mode voltage signal, for maintaining first current source module
11 and second current source module 13 output signal stability.
Further, as shown in Fig. 2, first current source module 11 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 17, 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 VOUTP of the connecting node as the first power amplifier loop.
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 13 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 13, for receiving
PWMN signal.
Further, as shown in Fig. 2, the second power amplifier loop 14 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 13, the second fortune
The non-inverting input terminal for calculating amplifier 22 is connect with the output end of common-mode voltage generation module 17, 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.
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.
Further, as shown in Fig. 2, the feedback module, comprising: the first feedback resistance RFB1 and the second feedback resistance
RFB2；
The first end of the first feedback resistance RFB1 is connect with the first input end of the first power amplifier loop 12, and second
End is connect with the first input end of the adjustment module 16；
The first end of the second feedback resistance RFB2 is connect with the first input end of the second power amplifier loop 14, and second
End is connect with the second input terminal of the adjustment module 16.
Further, as shown in Fig. 2, the adjustment module 16, comprising: first resistor R1, second resistance R2,3rd resistor
R3, the 4th resistance R4, first switch S1, second switch S2, third switch S3, the 4th switch S4, the 5th switch S5, the 6th switch
S6, the 7th switch S7 and the 8th switch S8；
The input terminal of the input terminal of the first switch S1 and the second switch S2 with the feedback module 15
The connection of one output end；
The output end of the output end of the third switch S3 and the 4th switch S4 with the first power amplifier loop 12
Output end connection；
The input terminal of the input terminal of the 5th switch S5 and the 6th switch S6 with the feedback module 15
The connection of two output ends；
The output end of the output end of the 7th switch S7 and the 8th switch S8 with the second power amplifier loop 14
Output end connection；
The output end of the output end of the first switch S1 and the 5th switch S5 with the first resistor R1
One end connection, the second end of the first resistor R1 respectively with the input terminal of the third switch S3 and the 7th switch S7
Input terminal connection；
The first end of the second resistance R2 is connect with the first end of the first resistor R1, the second end of second resistance R2
Grounding connection；
The output end of the output end of the second switch S2 and the 6th switch S6 with the 3rd resistor R3
One end connection, the second end of the 3rd resistor R3 respectively with the input terminal of the 4th switch S4 and the 8th switch S8
Input terminal connection；
The first end of the 4th resistance R4 is connect with the first end of the 3rd resistor R3, and the of the 4th resistance R4
Two end grounding connections；
First switch S1, second switch S2, third switch S3, the 4th switch S4, the 5th switch S5, the 6th switch S6,
The control terminal of seven switch S7 and the 8th switch S8 is for receiving the control signal, and the control signal is for controlling first switch
S1, second switch S2, third switch S3, the 4th switch S4, the 5th switch S5, the 6th switch S6, the 7th switch S7 and the 8th are opened
Close the working condition of S8；
It is led when the first switch S1, the third switch S3, the 6th switch S6 and the 8th switch S8 are in
When logical state, rest switch is in close state；
It is led when the second switch S2, the 4th switch S4, the 5th switch S5 and the 7th switch S7 are in
When logical state, rest switch is in close state.
It should be noted that being to use by setting first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4
In making the digital audio power amplification system generate higher output voltage.
Optionally, first switch S1, second switch S2, third switch S3, the 4th switch S4, the 5th switch S5, the 6th open
Closing S6, the 7th switch S7 and the 8th switch S8 is field-effect tube.
Optionally, the first switch S1, the third switch S3, the 6th switch S6 and the 8th switch S8 are equal
For p-type field-effect tube；
The second switch S2, the 4th switch S4, the 5th switch S5 and the 7th switch S7 are N-type field
Effect pipe.
Optionally, first switch S1, second switch S2, third switch S3, the 4th switch S4, the 5th switch S5, the 6th open
Closing S6, the 7th switch S7 and the 8th switch S8 is N-type field-effect tube；
The second switch S2, the 4th switch S4, the 5th switch S5 and the 7th switch S7 are p-type field
Effect pipe.
Further, as shown in figure 3, the common-mode voltage generation module 17, comprising: the 5th resistance R5, the 6th resistance R6,
7th resistance R7, the 8th resistance R8 and capacitor C；
The first end of the 5th resistance R5 is connect with voltage input end PVDD, the second end of the 5th resistance R5 and institute
The first end connection of the 6th resistance R6 is stated, the second end of the 6th resistance R6 is connect with the first end of the 7th resistance R7,
The second end grounding connection of the 7th resistance R7；
The first end of the 8th resistance R8 is connect with the first end of the 7th resistance R7, and the of the 8th resistance R8
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 7th resistance R7；
Output end of the connecting node of the 8th resistance R8 and capacitor C as the common-mode voltage generation module 17
VREF。
Wherein, the resistance value of the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 are identical.
Based on the digital audio power amplification system of above-mentioned offer, when the adjustment module 17 be not provided with the first switch S1,
The second switch S2, the third switch S3, the 4th switch S4, the 5th switch S5, the 6th switch S6, institute
When stating the 7th switch S7 and the 8th switch S8, the adjustment module 17 is divided for two parts, a part by first resistor R1 and
Second resistance R2 is constituted, then is connected by the way that the first feedback resistance RFB1 is corresponding with the progress of the first subsystem, and another part is by the
Three resistance R3 and the 4th resistance R4 are constituted, then are connected by the way that the second feedback resistance RFB2 is corresponding with the progress of the second subsystem.
At this time, it is assumed that the equivalent output impedance of the first current source module 11 and the second current source module 12 is r0,
So signal fluctuation Δ Vip of the output end Vip of the first current source module 11 is,
Wherein, Δ VOUTPFor the output end V of the first subsystemOUTPOutput pulsation.
Since the first power amplifier loop 12 is very big in low-band gain, from the input VREF of the first operational amplifier 21 to
The gain of Vip is equal to 1, therefore has,
Wherein, Δ PVDD is the voltage fluctuation of voltage input end.
Arrangement can obtain,
Similarly it is found that
Wherein, Δ VOUTNFor the output end V of the second subsystemOUTNOutput pulsation.
It is assumed that
Since in actual fabrication technique, the resistance value of resistance will appear certain fluctuation, at this time first resistor R1, second resistance
R2, 3rd resistor R3With the 4th voltage R4Dividing ratios and design value will appear deviation.
Once again, it is assumed that
α 1- α 2=Δ α
By the equivalent output impedance r0 of the first current source module 11 and the second current source module 13 much larger than the first feedback electricity
Hinder RFB1With the second feedback resistance RFB2, therefore it can be concluded that,
ΔVOUT=Δ VOUTP-ΔVOUTN
Wherein, Δ VOUTFor total output pulsation of digital audio power amplification system.
That is,
So, the power supply rejection ratio PSRR of digital audio power amplification system is,
It can be concluded that, the principal element of the power supply rejection ratio PSRR of high-voltage digital audio power amplification system is influenced from above-mentioned formula
It is first resistor R1, second resistance R2, 3rd resistor R3With the 4th voltage R4Matching degree.
Therefore, the present embodiment is by being arranged the first switch S1, the second switch S2, the third switch S3, institute
The 4th switch S4, the 5th switch S5, the 6th switch S6, the 7th switch S7 and the 8th switch S8 are stated, is led to
It crosses the switching within the different PWMP signal periods and PWMN signal period and uses adjustment module, for example, being high electricity in SWAP signal
Usually, the first switch S1, the third switch S3, the 6th switch S6 and the 8th switch S8 are on shape
State, rest switch are in close state, the output end V of the first subsystemOUTPPass through the first feedback resistance RFB1, first resistor R1With
Second resistance R2Electric current is poured into or extracts to the output end Vip of the first current source module, at this point, the output end of the second subsystem
VOUTNPass through the second feedback resistance RFB2, 3rd resistor R3With the 4th resistance R4It is poured into the output end Vin of the second current source module
Or extract electric current.When SWAP signal is low level, the second switch S2, the 4th switch S4, the 5th switch S5
In the conductive state with the 7th switch S7, rest switch is in close state, the output end V of the first subsystemOUTPPass through
First feedback resistance RFB1, 3rd resistor R3With the 4th resistance R4Electricity is poured into or extracted to the output end Vip of the first current source module
Stream, at this point, the output end V of the second subsystemOUTNPass through the second feedback resistance RFB2, first resistor R1With second resistance R2To second
The output end Vin of current source module pours into or extracts electric current.
It should be noted that PWMP signal period and PWMN signal period are identical with the SWAP signal period.
Therefore, it can be deduced that,
At this point, the output end V of the first subsystemOUTPFeedback proportional and the second subsystem output end VOUTNFeedback ratio
Example is identical, and divider resistance caused by the manufacturing process in power supply rejection ratio PSRR mismatches factor Δ α, perfect can eliminate, into
And improve the power supply rejection ratio PSRR of digital audio power amplification system.
A kind of digital audio power amplification system provided by the utility model is described in detail above, it is used herein
Specific case is expounded the principles of the present invention and embodiment, and the explanation of above example is only intended to help
Understand the method and its core concept of the utility model；At the same time, for those skilled in the art, according to the utility model
Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be understood
For limitations of the present invention.
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 can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (8)
1. a kind of digital audio power amplification system characterized by comprising the first subsystem, the second subsystem, feedback module and tune
Save 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；
Second subsystem includes: the second current source module and the second power amplifier loop, the output of second current source module
End is connect with the first input end of the second power amplifier loop, and the input terminal of second current source module is as second son
The signal input part of system, for receiving PWMN signal, the output end of the second power amplifier loop is as second subsystem
Output end；
The first input end of the feedback module is connect with the first input end of the first power amplifier loop, the feedback module
Second input terminal is connect with the first input end of the second power amplifier loop, the first output end and the tune of the feedback module
Save the first input end connection of module, the second input terminal company of the second output terminal of the feedback module and the adjustment module
It connects；
First output end of the adjustment module is connect with the output end of the first power amplifier loop, and the second of the adjustment module
Output end is connect with the output end of the second power amplifier loop；
The control terminal of the adjustment module is in for receiving control signal, the control signal for controlling the adjustment module
Different working conditions to adjust the resistors match degree of first subsystem and second subsystem, and then adjusts institute
State the power supply rejection ratio of digital audio power amplification system；
The control signal, the PWMP signal are identical with the period of the PWMN signal.
2. digital audio power amplification system according to claim 1, which is characterized in that the feedback module, comprising: first is anti-
Feed resistance and the second feedback resistance；
The first end of first feedback resistance is connect with the first input end of the first power amplifier loop, second end and the tune
Save the first input end connection of module；
The first end of second feedback resistance is connect with the first input end of the second power amplifier loop, second end and the tune
Save the second input terminal connection of module.
3. digital audio power amplification system according to claim 1, which is characterized in that the adjustment module, comprising: the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, first switch, second switch, third switch, the 4th switch, the 5th switch, the
Six switches, the 7th switch and the 8th switch；
The input terminal of the input terminal of the first switch and the second switch connects with the first output end of the feedback module
It connects；
The output end of the output end of the third switch and the 4th switch connects with the output end of the first power amplifier loop
It connects；
The input terminal of the input terminal of 5th switch and the 6th switch connects with the second output terminal of the feedback module
It connects；
The output end of the output end of 7th switch and the 8th switch connects with the output end of the second power amplifier loop
It connects；
The output end of the output end of the first switch and the 5th switch is connect with the first end of the first resistor, institute
The second end for stating first resistor is connect with the input terminal of the input terminal of third switch and the 7th switch respectively；
The first end of the second resistance is connect with the first end of the first resistor, the second end grounding connection of second resistance；
The output end of the output end of the second switch and the 6th switch is connect with the first end of the 3rd resistor, institute
The second end for stating 3rd resistor is connect with the input terminal of the input terminal of the 4th switch and the 8th switch respectively；
The first end of 4th resistance is connect with the first end of the 3rd resistor, and the second end of the 4th resistance, which is grounded, to be connected
It connects；
The first switch, the second switch, third switch, the 4th switch, the 5th switch, the described 6th
For receiving the control signal, the control signal is used for the control terminal of switch, the 7th switch and the 8th switch
Control the first switch, the second switch, third switch, the 4th switch, the 5th switch, the described 6th
The working condition of switch, the 7th switch and the 8th switch；
When the first switch, third switch, the 6th switch and the 8th switch in the conductive state, remaining
Switch is in close state；
When the second switch, the 4th switch, the 5th switch and the 7th switch in the conductive state, remaining
Switch is in close state.
4. digital audio power amplification system according to claim 3, which is characterized in that the first switch, described second open
It closes, third switch, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the described 8th
Switch is field-effect tube.
5. digital audio power amplification system according to claim 3, which is characterized in that the first switch, the third are opened
It closes, the 6th switch and the 8th switch are p-type field-effect tube；
The second switch, the 4th switch, the 5th switch and the 7th switch are N-type field-effect tube.
6. digital audio power amplification system according to claim 3, which is characterized in that the first switch, the third are opened
It closes, the 6th switch and the 8th switch are N-type field-effect tube；
The second switch, the 4th switch, the 5th switch and the 7th switch are p-type field-effect tube.
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: the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and capacitor；
The first end of 5th resistance is connect with voltage input end, second end and the 6th resistance of the 5th resistance
First end connection, the second end of the 6th resistance are connect with the first end of the 7th resistance, and the second of the 7th resistance
Hold grounding connection；
The first end of 8th resistance is connect with the first end of the 7th resistance, the second end of the 8th 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 7th resistance；
Output end of the connecting node of 8th resistance and the capacitor as the common-mode voltage generation module.
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| CN201821381631.2U CN208540147U (en) | 2018-08-27 | 2018-08-27 | A kind of digital audio power amplification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109104673A (en) * | 2018-08-27 | 2018-12-28 | 上海艾为电子技术股份有限公司 | A kind of digital audio power amplification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109104673A (en) * | 2018-08-27 | 2018-12-28 | 上海艾为电子技术股份有限公司 | A kind of digital audio power amplification system |
| CN109104673B (en) * | 2018-08-27 | 2023-11-17 | 上海艾为电子技术股份有限公司 | Digital audio power amplifier system |
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