CN209448886U - A kind of high-voltage digital audio power amplification system - Google Patents
A kind of high-voltage digital audio power amplification system Download PDFInfo
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- CN209448886U CN209448886U CN201822197231.2U CN201822197231U CN209448886U CN 209448886 U CN209448886 U CN 209448886U CN 201822197231 U CN201822197231 U CN 201822197231U CN 209448886 U CN209448886 U CN 209448886U
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Abstract
The utility model provides a kind of high-voltage digital audio power amplification system, the high-voltage digital audio power amplification system passes through setting current source generation module, for providing electric current for first subsystem and second subsystem, so that the high-voltage digital audio power amplification system works in higher voltage range, and then improve the output power of the high-voltage digital audio power amplification system.
Description
Technical field
The utility model relates to semiconductor integrated circuit technology fields, more specifically to a kind of high-voltage 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 cannot achieve High voltage output at present.
Utility model content
In view of this, to solve the above problems, the utility model provides a kind of high-voltage digital audio power amplification system, technical side
Case is as follows:
A kind of high-voltage digital audio power amplification system, comprising: the first subsystem, the second subsystem, the first feedback module, second
Feedback module and current source generation 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；
One end of first feedback module is connect with the first input end of the first power amplifier loop, the other end with it is described
The output end of first power amplifier loop connects；
One end of second feedback module is connect with the first input end of the second power amplifier loop, the other end with it is described
The output end of second power amplifier loop connects；
The first end of the current source generation module is connect with the first input end of the first power amplifier loop, second end with
The first input end of the second power amplifier loop connects, and third end and power supply connect for press bond, the 4th end and voltage input end
It connects, the 5th end grounding connection；
Wherein, the current source generation module is used to provide electric current for first subsystem and second subsystem,
To improve the output power of the high-voltage digital audio power amplification system.
Preferably, in above-mentioned high-voltage digital audio power amplification system, first feedback module includes: first resistor；
Wherein, one end of the first resistor is connect with the first input end of the first power amplifier loop, the other end and institute
State the output end connection of the first power amplifier loop；
Second feedback module includes: second resistance；
Wherein, one end of the second resistance is connect with the first input end of the second power amplifier loop, the other end and institute
State the output end connection of the second power amplifier loop.
Preferably, in above-mentioned high-voltage digital audio power amplification system, the current source generation module includes: the first field-effect
Pipe, the second field-effect tube, third field-effect tube, operational amplifier and 3rd resistor；
Wherein, the inverting input terminal of the operational amplifier and the power supply be for press bond, the operational amplifier
Non-inverting input terminal is connect with the first end of the 3rd resistor, and the second end of the 3rd resistor and the voltage input end connect
It connects；
The drain electrode of first field-effect tube is connect with the first end of the 3rd resistor；
The drain electrode of second field-effect tube is connect with the first input end of the first power amplifier loop；
The drain electrode of the third field-effect tube is connect with the second input terminal of the second power amplifier loop；
The grid of the grid of first field-effect tube, the grid of second field-effect tube and the third field-effect tube
It is connect with the output end of the operational amplifier；
The source electrode of the source electrode of first field-effect tube, the source electrode of second field-effect tube and the third field-effect tube
Equal grounding connection.
Preferably, in above-mentioned high-voltage digital audio power amplification system, the resistance value of the 3rd resistor is the first resistor
Twice of resistance value.
Preferably, in above-mentioned high-voltage digital audio power amplification system, first field-effect tube, second field-effect tube
It is N-type field-effect tube with the third field-effect tube.
Preferably, in above-mentioned high-voltage digital audio power amplification system, first field-effect tube, second field-effect tube
It is identical with the breadth length ratio of the third field-effect tube.
Preferably, in above-mentioned high-voltage digital audio power amplification system, the high-voltage 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, in above-mentioned high-voltage digital audio power amplification system, the common-mode voltage generation module includes: the 4th electricity
Resistance, the 5th resistance, the 6th resistance and capacitor；
The first end of 4th resistance and the power supply are for press bond, the second end of the 4th resistance and described the
The first end of five resistance connects, the second end grounding connection of the 5th resistance；
The first end of 6th resistance is connect with the second end of the 4th resistance, the second end of the 6th resistance with
The first end of the capacitor connects, the second end grounding connection of the capacitor；
Output end of the connecting node of 6th resistance and the capacitor as the common-mode voltage generation module.
Preferably, in above-mentioned high-voltage digital audio power amplification system, the resistance value of the 4th resistance and the 5th resistance
Resistance value it is identical.
Preferably, in above-mentioned high-voltage digital audio power amplification system, the output end voltage of the common-mode voltage generation module
It is the power supply for the half of pressure side.
Compared to the prior art, of the utility model to have the beneficial effect that
A kind of high-voltage digital audio power amplification system provided by the utility model by setting current source generation module, for for
First subsystem and second subsystem provide electric current, so that high-voltage digital audio power amplification system work is higher
Voltage range, and then improve the output power of the high-voltage digital audio power amplification system.
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 a kind of structural schematic diagram of high-voltage digital audio power amplification system provided by the embodiment of the utility model；
Fig. 2 is another structural schematic diagram of high-voltage digital audio power amplification system provided by the embodiment of the utility model；
Fig. 3 is the structural schematic diagram of current source generation module provided by the embodiment of the utility model；
Fig. 4 is a kind of structural schematic diagram of common-mode voltage generation module provided by the embodiment of the utility model；
Fig. 5 is a kind of waveform diagram of first capacitor charge and discharge 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 a kind of structural representation of high-voltage digital audio power amplification system provided by the embodiment of the utility model
Figure, effect are that treated that pwm signal is converted into analog signal, the high-voltage digital audio power amplification system packet by digital module
It includes: the first subsystem, the second subsystem, the first feedback module 13, the second feedback module 17 and current source generation module 14；
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 Vip of the first power amplifier loop 12, first current source module 11 it is defeated
Enter signal input part of the end as first subsystem, for receiving PWMP signal, the output of the first power amplifier loop 12
Hold the output end VOP as 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 of block 15 is connect with the first input end Vin 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；
One end of first feedback module 13 is connect with the first input end Vip of the first power amplifier loop 12, another
End is connect with the output end of the first power amplifier loop 12；
One end of second feedback module 17 is connect with the first input end Vin of the second power amplifier loop 16, another
End is connect with the output end of the second power amplifier loop 16；
The first end of the current source generation module 14 is connect with the first input end Vip of the first power amplifier loop 12,
Second end is connect with the first input end Vin of the second power amplifier loop 16, and third end and power supply are for pressure side VDD connection, and the 4th
End is connect with voltage input end PVDD, the 5th end grounding connection；
Wherein, the current source generation module 14 is used to provide electricity for first subsystem and second subsystem
Stream, to improve the output power of the high-voltage digital audio power amplification system.
As can be seen from the above description, a kind of high-voltage digital audio power amplification system provided by the utility model passes through setting electric current
Source generation module, for providing electric current for first subsystem and second subsystem, so that the high-voltage digital audio
Power amplification system work improves the output power of the high-voltage digital audio power amplification system in higher voltage range.
Further, as shown in Figure 1, the high-voltage digital audio power amplification system, further includes: common-mode voltage generation module
18；
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 18.
In this embodiment, the common-mode voltage generation module 18 is for generating common mode voltage signal, for remaining described
The stability of the output signal of first current source module 11 and second current source module 12.
Wherein, the output end voltage of the common-mode voltage generation module 18 is half of the power supply for pressure side VDD.
It further, is the another of high-voltage digital audio power amplification system provided by the embodiment of the utility model with reference to Fig. 2, Fig. 2
One structural schematic diagram, first current source module 11 include 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, field-effect tube P1 and 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 VREF of common-mode voltage generation module 18, the first operational amplifier 21
Output end connect with the input terminal of the power amplifier loop drive module 23, the power amplifier loop drive module 23 first output
End is connect with the grid of the field-effect tube P1, the second output terminal and the field-effect tube of the power amplifier loop drive module 23
The grid of N1 connects.
The source electrode of the field-effect tube P1 is connect with voltage input end PVDD, the drain electrode of the field-effect tube P1 and the field
The drain electrode of effect pipe N1 connects, the source electrode grounding connection of the field-effect tube N1, the field-effect tube P1 and the field-effect tube
Output end VOP of the connecting node of N1 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 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 15, 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, field-effect tube P2 and field-effect tube N2；
The inverting input terminal of second operational amplifier 22 is connect with the output end of second current source module 16, the second fortune
The non-inverting input terminal for calculating amplifier 22 is connect with the output end VREF of common-mode voltage generation module 18, second operational amplifier 22
Output end connect with the input terminal of the power amplifier loop drive module 24, the power amplifier loop drive module 24 first output
End is connect with the grid of the field-effect tube P2, the second output terminal and the field-effect tube of the power amplifier loop drive module 24
The grid of N2 connects.
The source electrode of the field-effect tube P2 is connect with voltage input end PVDD, the drain electrode of the field-effect tube P2 and the field
The drain electrode of effect pipe N2 connects, the source electrode grounding connection of the field-effect tube N2, the field-effect tube P2 and the field-effect tube
Output end VON of the connecting node of N2 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, first feedback module 13 includes: first resistor Rfb1；
Wherein, one end of the first resistor Rfb1 is connect with the first input end of the first power amplifier loop 12, another
End is connect with the output end of the first power amplifier loop 12；
Second feedback module 16 includes: second resistance Rfb2；
Wherein, one end of the second resistance Rfb2 is connect with the first input end of the second power amplifier loop 16, another
End is connect with the output end of the second power amplifier loop 16.
It further, is the structural representation of current source generation module provided by the embodiment of the utility model with reference to Fig. 3, Fig. 3
Figure, the current source generation module 14 includes: the first field-effect tube M1, the second field-effect tube M2, third field-effect tube M3, operation
Amplifier 31 and 3rd resistor R3；
Wherein, the inverting input terminal of the operational amplifier 31 is connect with the power supply for pressure side VDD, the operation amplifier
The non-inverting input terminal of device 31 is connect with the first end of the 3rd resistor R3, the second end of the 3rd resistor R3 and the voltage
Input terminal PVDD connection；
The drain electrode of the first field-effect tube M1 is connect with the first end of the 3rd resistor R3；
The drain electrode of the second field-effect tube M2 is connect with the first input end Vip of the first power amplifier loop 12；
The drain electrode of the third field-effect tube M3 is connect with the second input terminal Vin of the second power amplifier loop 16；
The grid and the third field-effect tube M3 of the grid of the first field-effect tube M1, the second field-effect tube M2
Grid connect with the output end of the operational amplifier 31；
The source electrode and the third field-effect tube M3 of the source electrode of the first field-effect tube M1, the second field-effect tube M2
Source grounding connection.
Further, the resistance value of the 3rd resistor R3 is twice of the resistance value of the first resistor Rfb1.
The first field-effect tube M1, the second field-effect tube M2 and the third field-effect tube M3 are N-type field effect
Ying Guan.
The breadth length ratio phase of the first field-effect tube M1, the second field-effect tube M2 and the third field-effect tube M3
Together.
It further, is a kind of knot of common-mode voltage generation module provided by the embodiment of the utility model with reference to Fig. 4, Fig. 4
Structure schematic diagram, the common-mode voltage generation module 18 include: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and capacitor C；
The first end of the 4th resistance R4 is connect with the power supply for pressure side PVDD, the second end of the 4th resistance R4
It 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 second end of the 4th resistance R4, and the of the 6th resistance R6
Two ends are connect with the first end of the capacitor C, the second end grounding connection of the capacitor C；
Output of the connecting node of the 6th resistance R6 and capacitor C as the common-mode voltage generation module 18
Hold VREF.
Further, the resistance value of the 4th resistance R4 is identical with the resistance value of the 5th resistance R5.
High-voltage digital audio power amplification system based on above-mentioned offer, when the output end electricity of the common-mode voltage generation module 18
When pressure VREF is half of the power supply for pressure side VDD, the high-voltage digital audio power amplification system just be can work normally.
It is former with the work of the first subsystem below since the working principle of the first subsystem and the second subsystem is identical
Reason is described.
When VOP=" 1 ", the output end VOP of the first subsystem passes through first resistor Rfb1 and current source generation module 14
It charges to first capacitor C1, the electric current of charging is labeled as IRfb1_a；
When VOP=" 0 ", the output end VOP of the first subsystem passes through first resistor Rfb1 and current source generation module 14
It discharges to first capacitor C1, the electric current of electric discharge is labeled as IRfb1_b；
Due to high-voltage digital audio power amplification system work normally in the case where, IRfb1_a=IRfb1_b, and it is labeled as IRfb1。
That is, IRfb1_a=IRfb1_b=IRfb1
Wherein, IRfb1Indicate that the output end VOP of the first subsystem passes through first resistor Rfb1 and current source generation module 14
To the current value of first capacitor C1 charge or discharge.
Since the output end voltage VREF of the common-mode voltage generation module 18 is half of the voltage for pressure side VDD,
Therefore it can obtain:
Referring to figs. 2 and 3 it is found that
And then can obtain,
Wherein, ISNK1Indicate that current source generation module 14 is the current value that the first subsystem provides.
And then can obtain,
And then can obtain,
As shown in figure 3, due to twice of resistance value that the resistance value of the 3rd resistor R3 is the first resistor Rfb1, and institute
It is identical with the breadth length ratio of the third field-effect tube M3 to state the first field-effect tube M1, the second field-effect tube M2.
It therefore follows that
Wherein, ISNK2Indicate that current source generation module 14 is the current value that the second subsystem provides.
Also, pass through the relationship between analysis input duty cycle and output signal, it is found that refer to Fig. 5, Fig. 5 is this
A kind of waveform diagram for the first capacitor charge and discharge that utility model embodiment provides, first capacitor C1 is a PWMP period
Interior charge and discharge 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 is by first resistor Rfb1 and the current source generation module 14 to the first electricity
Hold C1 charging, at this time the electric current of first capacitor C1 are as follows:
IC1_T1=IDAC+IRfb1
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 is by first resistor Rfb1 and the current source generation module 14 to the first electricity
Hold C1 electric discharge, at this time the electric current of first capacitor C1 are as follows:
IC1_T2=IDAC-IRfb1
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 is by first resistor Rfb1 and the current source generation module 14 to the first electricity
Hold C1 electric discharge, at this time the electric current of first capacitor C1 are as follows:
IC1_T3=-IDAC-IRfb1
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 is by first resistor Rfb1 and the current source generation module 14 to the first electricity
Hold C1 charging, at this time the electric current of first capacitor C1 are as follows:
IC1_T4=-IDAC+IRfb1
Since the first subsystem is in 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 first current source IDAC1 and second
The electric current of current source IDAC2.
It can be obtained by arranging above-mentioned formula,
IDAC×(t1+t2)-IDAC× (t3+t4)=IRfb1×(t2+t3)-IRfb1×(t1+t4)
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 VO P of so the first subsystem are as follows:
VOP=DOUT×PVDD
That is,
By the above formula, VOP be one withFor common-mode point, 50% input duty cycle DINCentered on
Signal.
The output voltage VO N of the second subsystem, no longer illustrates herein known to similarly.
So, total output voltage V of digital audio power amplification systemOUTFor,
VOUT=VOP-VON
That is,
VOUT=2 × Rfb1 × IDAC(2×DIN-1)
It follows that the gain of the high-voltage digital audio power amplification system is 2 × Rfb1 × IDAC。
As can be seen from the above description, a kind of high-voltage digital audio power amplification system provided by the utility model passes through setting electric current
Source generation module, for providing electric current for first subsystem and second subsystem, so that the high-voltage digital audio
Power amplification system work improves the output power of the high-voltage digital audio power amplification system in higher voltage range, to increase
The loudness of strong loudspeaker.
A kind of high-voltage digital audio power amplification system provided by the utility model is described in detail above, herein
Specific case is applied to be expounded the principles of the present invention and embodiment, the explanation of above example is only intended to
Help understands the method and its core concept of the utility model；At the same time, for those skilled in the art, it is practical according to this
Novel thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not answered
It is construed as a limitation 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 (10)
1. a kind of high-voltage digital audio power amplification system characterized by comprising the first subsystem, the second subsystem, the first feedback
Module, the second feedback module and current source generation 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；
One end of first feedback module is connect with the first input end of the first power amplifier loop, the other end and described first
The output end of power amplifier loop connects；
One end of second feedback module is connect with the first input end of the second power amplifier loop, the other end and described second
The output end of power amplifier loop connects；
The first end of the current source generation module is connect with the first input end of the first power amplifier loop, second end with it is described
The first input end of second power amplifier loop connects, and for press bond, the 4th end is connect with voltage input end for third end and power supply, the
Five end grounding connections；
Wherein, the current source generation module is used to provide electric current for first subsystem and second subsystem, to mention
The output power of the high high-voltage digital audio power amplification system.
2. high-voltage digital audio power amplification system according to claim 1, which is characterized in that the first feedback module packet
It includes: first resistor；
Wherein, one end of the first resistor is connect with the first input end of the first power amplifier loop, the other end and described the
The output end of one power amplifier loop connects；
Second feedback module includes: second resistance；
Wherein, one end of the second resistance is connect with the first input end of the second power amplifier loop, the other end and described the
The output end of two power amplifier loops connects.
3. high-voltage digital audio power amplification system according to claim 2, which is characterized in that the current source generation module packet
It includes: the first field-effect tube, the second field-effect tube, third field-effect tube, operational amplifier and 3rd resistor；
Wherein, the inverting input terminal of the operational amplifier and the power supply are for press bond, the same phase of the operational amplifier
Input terminal is connect with the first end of the 3rd resistor, and the second end of the 3rd resistor is connect with the voltage input end；
The drain electrode of first field-effect tube is connect with the first end of the 3rd resistor；
The drain electrode of second field-effect tube is connect with the first input end of the first power amplifier loop；
The drain electrode of the third field-effect tube is connect with the second input terminal of the second power amplifier loop；
The grid of the grid of first field-effect tube, the grid of second field-effect tube and the third field-effect tube with
The output end of the operational amplifier connects；
The source electrode of the source electrode of first field-effect tube, the source electrode of second field-effect tube and the third field-effect tube connects
Ground connection.
4. high-voltage digital audio power amplification system according to claim 3, which is characterized in that the resistance value of the 3rd resistor is
Twice of the resistance value of the first resistor.
5. high-voltage digital audio power amplification system according to claim 3, which is characterized in that first field-effect tube, institute
Stating the second field-effect tube and the third field-effect tube is N-type field-effect tube.
6. high-voltage digital audio power amplification system according to claim 3, which is characterized in that first field-effect tube, institute
It is identical with the breadth length ratio of the third field-effect tube to state the second field-effect tube.
7. high-voltage digital audio power amplification system according to claim 1, which is characterized in that the high-voltage digital audio frequency power amplifier
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 is electric with the common mode
Press the output end connection of generation module.
8. high-voltage digital audio power amplification system according to claim 7, which is characterized in that the common-mode voltage generation module
It include: the 4th resistance, the 5th resistance, the 6th resistance and capacitor；
The first end of 4th resistance and the power supply are for press bond, the second end of the 4th resistance and the 5th electricity
The first end of resistance connects, the second end grounding connection of the 5th resistance；
The first end of 6th resistance is connect with the second end of the 4th resistance, the second end of the 6th resistance with it is described
The first end of capacitor connects, the second end grounding connection of the capacitor；
Output end of the connecting node of 6th resistance and the capacitor as the common-mode voltage generation module.
9. high-voltage digital audio power amplification system according to claim 8, which is characterized in that the resistance value of the 4th resistance and
The resistance value of 5th resistance is identical.
10. high-voltage digital audio power amplification system according to claim 7, which is characterized in that the common-mode voltage generates mould
The output end voltage of block is half of the power supply for pressure side.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688514A (en) * | 2018-12-26 | 2019-04-26 | 上海艾为电子技术股份有限公司 | A kind of high-voltage digital audio power amplification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688514A (en) * | 2018-12-26 | 2019-04-26 | 上海艾为电子技术股份有限公司 | A kind of high-voltage digital audio power amplification system |
| CN109688514B (en) * | 2018-12-26 | 2023-09-15 | 上海艾为电子技术股份有限公司 | High-voltage digital audio power amplifier system |
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