CN208540148U - A kind of digital audio power amplification system - Google Patents
A kind of digital audio power amplification system Download PDFInfo
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- CN208540148U CN208540148U CN201821381659.6U CN201821381659U CN208540148U CN 208540148 U CN208540148 U CN 208540148U CN 201821381659 U CN201821381659 U CN 201821381659U CN 208540148 U CN208540148 U CN 208540148U
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Abstract
This application provides a kind of digital audio power amplification systems, comprising: the first current source module, the second current source module, the first power amplifier loop, the second power amplifier loop and adjustment module；The digital audio power amplification system, by the way that adjustment module is arranged, make that the first current source module is used alternatingly in the first power amplifier loop and the second power amplifier loop and the second current source module works, and then keep the voltage of the first power amplifier loop and the second power amplifier loop equal, eliminate the DC offset voltage between the first current source module and the second current source module, so as to improve the power supply rejection ratio of the digital audio power amplification system, the noise on loudspeaker is eliminated.
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
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 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
In view of this, technical solution is such as to solve the above problems, the utility model provides a kind of digital audio power amplification system
Under:
A kind of digital audio power amplification system, comprising: the first current source module, the second current source module, the first power amplifier loop,
Second power amplifier loop and adjustment module；
The adjustment module includes: signal receiving unit and converting unit；
For the first input end of the signal receiving unit for receiving PWMP signal, the first of the signal receiving unit is defeated
Outlet is connect with the input terminal of first current source module；
The output end of first current source module is connect with the first input end of the converting unit；
For second input terminal of the signal receiving unit for receiving PWMN signal, the second of the signal receiving unit is defeated
Outlet is connect with the input terminal of second current source module；
The output end of second current source module is connect with the second input terminal of the converting unit；
First output end of the converting unit is connect with the first input end of the first power amplifier loop, and the conversion is single
The second output terminal of member is connect with the first input end of the second power amplifier loop；
Wherein, the adjustment module is used to for the PWMP signal to be transmitted to the first defeated of the first power amplifier loop always
Enter end, and the PWMN signal is transmitted to the first input end of the second power amplifier loop always；
The adjustment module is also used to when the adjustment module is in the first working condition, controls first current source
Electric current is injected to the first power amplifier loop or extracted to module, and controls second current source module to the second power amplifier ring
Electric current is extracted in road injection；When the adjustment module is in the second working condition, first current source module is controlled to institute
State the injection of the second power amplifier loop or extract electric current, and control second current source module injected to the first power amplifier loop or
Extract electric current.
Preferably, the converting unit includes: first switch tube, second switch, third switching tube and the 4th switching tube；
The signal receiving unit includes: the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube；
The input terminal of the first switch tube and the input terminal of the second switch with first current source module
Output end connection；
The input terminal of the input terminal of the third switching tube and the 4th switching tube with second current source module
Output end connection；
The output end of the first switch tube and the 4th switching tube is inputted with the first of the first power amplifier loop
End connection；
The output end of the second switch and the third switching tube is inputted with the first of the second power amplifier loop
End connection；
The input terminal of 5th switching tube and the 6th switching tube receives the PWMP signal；
The input terminal of 7th switching tube and the 8th switching tube receives the PWMN signal；
Input terminal of the output end of 5th switching tube and the 7th switching tube with first current source module
Connection；
Input terminal of the output end of 6th switching tube and the 8th switching tube with second current source module
Connection；
It is led when the first switch tube, the third switching tube, the 5th switching tube and the 8th switching tube are in
When logical state, the second switch, the 4th switching tube, the 6th switching tube and the 7th switching tube are in cut-off
State；When the first switch tube, the third switching tube, the 5th switching tube and the 8th switching tube are in cut-off shape
When state, the second switch, the 4th switching tube, the 6th switching tube and the 7th switching tube are on shape
State.
Preferably, the first switch tube, the second switch, the third switching tube, the 4th switching tube, institute
Stating the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube is field-effect tube.
Preferably, the digital audio power amplification system further include: feedback regulation module；
The first input end of the feedback regulation module is connect with the first input end of the first power amplifier loop, described anti-
Second input terminal of feedback adjustment module is connect with the first input end of the second power amplifier loop；
First output end of the feedback regulation module is connect with the output end of the first power amplifier loop, and the feedback is adjusted
The second output terminal of section module is connect with the output end of the second power amplifier loop；
The control terminal of the feedback regulation module is for receiving control signal, and the control signal is for controlling the feedback
Adjustment module is in different working conditions, to adjust the resistors match degree of the digital audio power amplification system, and then adjusts
The power supply rejection ratio of the digital audio power amplification system.
Preferably, the feedback regulation module includes: the first feedback resistance, the second feedback resistance, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance, first switch, second switch, third switch, the 4th switch, the 5th switch, the 6th switch, the
Seven switches and the 8th switch；
The first end of first feedback resistance is connect with the first input end of the first power amplifier loop, second end difference
It is connect with the input terminal of the first switch and the second switch；
The first end of second feedback resistance is connect with the first input end of the second power amplifier loop, second end difference
It is connect with the input terminal of the 5th switch and the 6th switch；
The output end of the first switch and the 5th switch is connect with the first end of the first resistor, and described the
The second end of one resistance connect with the input terminal of third switch and the 7th switch respectively, the third switch with it is described
The output end of 4th switch is connect with the output end of the first power amplifier loop；
The output end of the second switch and the 6th switch is connect with the first end of the 3rd resistor, and described the
The second end of three resistance respectively with it is described 4th switch and it is described 8th switch input terminal connect, it is described 7th switch with it is described
The output end of 8th switch is connect with the output end of the second power amplifier loop；
The first end of the second resistance is connect with the first end of the first resistor, the second termination of the second resistance
Ground connection；
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.
Compared to the prior art, of the utility model to have the beneficial effect that
The digital audio power amplification system replaces the first power amplifier loop and the second power amplifier loop by the way that adjustment module is arranged
It is worked using the first current source module and the second current source module, and then makes the first power amplifier loop and the second power amplifier loop
Voltage is equal, eliminates the DC offset voltage between the first current source module and the second current source module, so as to improve institute
The power supply rejection ratio for stating digital audio power amplification system eliminates 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 audio power amplification system provided by the embodiment of the utility model；
Fig. 2 is another structural schematic diagram of digital audio power amplification 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 and adjustment module；
First subsystem includes: the first current source module 11 and the first power amplifier loop 12, the second subsystem packet
It includes: the second current source module 13 and the second power amplifier loop 14；
The adjustment module includes: signal receiving unit 152 and converting unit 151；Wherein, the signal receiving unit
152 first input end receives single 152 yuan of the first output end and first electric current for receiving PWMP signal, the signal
The input terminal of source module 11 connects；First input of the output end of first current source module 11 and the converting unit 151
End connection；
Second input terminal of the signal receiving unit 152 is used to receive PWMN signal, the signal receiving unit 152
Second output terminal is connect with the input terminal of second current source module 13；The output end of second current source module 13 and institute
State the second input terminal connection of converting unit 151；
First output end of the converting unit 151 is connect with the first input end Vip of the first power amplifier loop 12, institute
The second output terminal for stating converting unit 151 is connect with the first input end Vin of the second power amplifier loop 14；
Output end VOUTP of the output end of the first power amplifier loop 12 as first subsystem, second function
Put output end VOUTN of the output end of loop 14 as second subsystem；
Wherein, the adjustment module is used to the PWMP signal being transmitted to the first of the first power amplifier loop 12 always
Input terminal Vip, and the PWMN signal is transmitted to the first input end Vin of the second power amplifier loop 14 always；
The adjustment module is also used to when the adjustment module is in the first working condition, controls first current source
Electric current is injected to the first power amplifier loop 12 or extracted to module 11, and controls second current source module 13 to described second
Electric current is extracted in the injection of power amplifier loop 14；When the adjustment module is in the second working condition, first current source is controlled
Electric current is injected to the second power amplifier loop 14 or extracted to module 11, and controls second current source module 13 to described first
Electric current is extracted in the injection of power amplifier loop 12.
For example, the adjustment module also receives control instruction signal, to control signal receiving unit 152 and converting unit
151 working condition, so that PWMP signal is transmitted to the first input end Vip of the first power amplifier loop 12 always, and by institute
The first input end Vin that PWMN signal is transmitted to the second power amplifier loop 14 always is stated, and when control instruction signal is height
When level, controls first current source module 11 and electric current is injected or extracted to the first power amplifier loop 12, and described in control
Electric current is injected to the second power amplifier loop 14 or extracted to second current source module 13；When control instruction signal is low level,
It controls first current source module 11 and electric current is injected or extracted to the second power amplifier loop 14, and control second electric current
Source module 13 injects to the first power amplifier loop 12 or extracts electric current.
Wherein, the PWMP signal, the PWMN signal are identical with the period of the control instruction signal.
The digital audio power amplification system makes the first power amplifier loop 12 and the second power amplifier loop by the way that adjustment module 15 is arranged
14 are used alternatingly the first current source module 11 and the second current source module 12 works, and then make the first power amplifier loop 12 and
The voltage of two power amplifier loops 14 is equal, i.e. the voltage of the first subsystem and the second subsystem is equal, and then eliminates the first electric current
DC offset voltage between source module 11 and the second current source module 13, so as to improve the digital audio power amplification system
Power supply rejection ratio eliminates the noise on loudspeaker.
Further, as shown in Figure 1, the digital audio power amplification system further include: feedback regulation module 16；
The first input end Vip of the first input end of the feedback regulation module 16 and the first power amplifier loop 12 connects
It connects, the second input terminal of the feedback regulation module 16 is connect with the first input end Vin of the second power amplifier loop 14；
First output end of the feedback regulation module 16 is connect with the output end of the first power amplifier loop 12, described anti-
The second output terminal of feedback adjustment module 16 is connect with the output end of the second power amplifier loop 14；
For the control terminal of the feedback regulation module 16 for receiving control signal, the control signal is described anti-for controlling
Feedback adjustment module 16 is in different working conditions, to adjust the resistors match degree of the digital audio power amplification system, in turn
Adjust the power supply rejection ratio of the digital audio power amplification system.
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.
Output end of the connecting node of the switch A and the switch B as first current source module 11, and it is described
The first input end of adjustment module 15 connects.
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；
First input end Vip of the inverting input terminal of first operational amplifier 21 as the first power amplifier loop 12, with
First output end of the adjustment module 15 connects, the non-inverting input terminal and common-mode voltage generation module of the first operational amplifier 21
The input terminal of 17 output end VREF connection, the output end of the first operational amplifier 21 and the power amplifier loop drive module 23 connects
It connects, the first output end of the power amplifier loop drive module 23 is connect with the grid of the first field-effect tube P1, the power amplifier
The second output terminal of loop drive module 23 is connect with the grid of the second field-effect tube N1.
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.
Output end of the connecting node of the switch C and the switch D as second current source module 13, and it is described
Second input terminal of adjustment module 15 connects.
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；
First input end Vin of the inverting input terminal of second operational amplifier 22 as the second power amplifier loop 14, with
The second output terminal of the adjustment module 15 connects, the non-inverting input terminal and common-mode voltage generation module of second operational amplifier 22
The input terminal of 17 output end VREF connection, the output end of second operational amplifier 22 and the power amplifier loop drive module 24 connects
It connects, the first output end of the power amplifier loop drive module 24 is connect with the grid of the third field-effect tube P2, the power amplifier
The second output terminal of loop drive module 24 is connect with the grid of the 4th field-effect tube N2.
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 14.
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 converting unit includes: first switch tube E, second switch F, third switch
Pipe G and the 4th switching tube H；The signal receiving unit includes: the 5th switching tube E1, the 6th switching tube H1, the 7th switching tube F1
With the 8th switching tube G1；
The input terminal of the input terminal of the first switch tube E and the second switch F with the first current source mould
The output end of block 11 connects；
The input terminal of the input terminal of the third switching tube G and the 4th switching tube H with the second current source mould
The output end of block 13 connects；
The output end of the first switch tube E and the 4th switching tube H with the first power amplifier loop 12 first
Input terminal Vip connection；
The output end of the second switch F and the third switching tube G with the second power amplifier loop 14 first
Input terminal Vin connection；
The input terminal of the 5th switching tube E1 and the 6th switching tube H1 receives the PWMP signal；
The input terminal of the 7th switching tube F1 and the 8th switching tube G1 receives the PWMN signal；
The output end of the 5th switching tube E1 and the 7th switching tube F1 with first current source module 11
Input terminal connection；
The output end of the 6th switching tube H1 and the 8th switching tube G1 with second current source module 13
Input terminal connection；
As the first switch tube E, the third switching tube G, the 5th switching tube E1 and the 8th switching tube G1
When in the conductive state, the second switch F, the 4th switching tube H, the 6th switching tube H1 and the 7th switch
Pipe F1 is in off state；As the first switch tube E, the third switching tube G, the 5th switching tube E1 and the described 8th
When switching tube G1 is in off state, the second switch F, the 4th switching tube H, the 6th switching tube H1 and described
7th switching tube F1 is in the conductive state.
Optionally, the first switch tube E, the second switch F, the third switching tube G, the 4th switching tube
H, the 5th switching tube E1, the 6th switching tube H1, the 7th switching tube F1 and the 8th switching tube G1 are field
Effect pipe.
Further, as shown in Fig. 2, the feedback regulation module 16 includes: the first feedback resistance RFB1, the second feedback electricity
Hinder RFB2, 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 first end of the first feedback resistance RFB1 is connect with the first input end Vip of the first power amplifier loop 12,
Second end is connect with the input terminal of the first switch S1 and the second switch S2 respectively；
The first end of the second feedback resistance RFB2 is connect with the first input end Vin of the second power amplifier loop 14,
Second end is connect with the input terminal of the 5th switch S5 and the 6th switch S6 respectively；
The output end of the first switch S1 and the 5th switch S5 are connect with the first end of the first resistor R1,
The second end of the first resistor R1 is connect with the input terminal of the third switch S3 and the 7th switch S7 respectively, and described
The output end of three switch S3 and the 4th switch S4 are connect with the output end VOUTP of the first power amplifier loop 12；
The output end of the second switch S2 and the 6th switch S6 are connect with the first end of the 3rd resistor R3,
The second end of the 3rd resistor R3 is connect with the input terminal of the 4th switch S4 and the 8th switch S8 respectively, and described
The output end of seven switch S7 and the 8th switch S8 are connect with the output end VOUTN of the second power amplifier loop 14；
The first end of the second resistance R2 is connect with the first end of the first resistor R1, and the of the second resistance R2
Two end grounding connections；
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 realized by setting first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4
Partial pressure, for making the digital audio power amplification system generate higher output voltage.
Specifically, as described in Figure 2, the first resistor R1 and the second resistance R2 form partial pressure, R2=2*R1 is set,
Similarly, the 3rd resistor R3 and the 4th resistance R4 forms partial pressure, sets R4=2*R3, at this time the first subsystem and second
The ceiling voltage of the output end of subsystem is 2/3 times of voltage input end PVDD, and common mode voltage signal VREF becomes voltage input
1/3 times for holding PVDD, this means that common mode voltage signal VREF is 3.3V, first when voltage input end PVDD is 10V
Current source module, the second current source module, the first power amplifier loop and the second power amplifier loop supply voltage be equal to 5V in the case where,
Circuit still can work normally, and then realize the function of High voltage output.
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, the first switch S1, the third switch S3, the 6th switch S6 and the 8th switch S8 are equal
For 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, the second end of the 5th resistance R5 and described the
The first end of six resistance R6 connects, and the second end of the 6th resistance R6 is connect with the first end of the 7th resistance R7, described
The second end grounding connection of 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.
Due to joined first resistor R1, second resistance R2, 3rd resistor R3With the 4th voltage R4, in actual fabrication technique
In, the resistance value of resistance will appear certain fluctuation, at this time first resistor R1, second resistance R2, 3rd resistor R3With the 4th voltage R4
Dividing ratios and design value will appear deviation.
It is assumed that
Once again, it is assumed that
α 1- α 2=Δ α
Based on the digital audio power amplification system of above-mentioned offer, when the feedback regulation module 16 is 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
When S6, the 7th switch S7 and the 8th switch S8, the feedback regulation module 16 is divided for two parts, and a part is by first
Resistance R1, second resistance R2It constitutes, then passes through the first feedback resistance RFB1It is corresponding with the progress of the first subsystem to connect, another part
By 3rd resistor R3With the 4th voltage R4It constitutes, then passes through the second feedback resistance RFB2It is corresponding with the progress of the second subsystem to connect.
At this time, it is assumed that the equivalent output impedance of the first current source module 11 be r0P, the second current source module 13 it is equivalent defeated
Impedance is r0N out, since the digital audio power amplification system is provided with adjustment module 15, eliminates the first current source module 11 and the
The DC offset voltage of two current source modules 13, therefore, from the first input end Vip and the second power amplifier ring of the first power amplifier loop 12
The equivalent output of first current source module 11 and second current source module 13 that the first input end Vin on road 14 sees
Impedance r0 is,
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.
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 feedback regulation module 16, for example, in control signal
When for high level, the first switch S1, the third switch S3, the 6th switch S6 and the 8th switch S8 are in and lead
Logical state, rest switch are in close state, the output end V of the first subsystemOUTPPass through the first feedback resistance RFB1, first electricity
Hinder R1With second resistance R2Electric current is poured into or extracts to the output end Vip of the first current source module 11, at this point, the second subsystem
Output end VOUTNPass through the second feedback resistance RFB2, 3rd resistor R3With the 4th resistance R4To the output end of the second current source module 13
Vin pours into or extracts electric current.When controlling signal is low level, the second switch S2, the 4th switch S4, the described 5th
Switch S5 and the 7th switch S7 are in the conductive state, and rest switch is in close state, the output end of the first subsystem
VOUTPPass through the first feedback resistance RFB1, 3rd resistor R3With the 4th resistance R4It is filled to the output end Vip of the first current source module 11
Enter or extract electric current, at this point, the output end V of the second subsystemOUTNPass through the second feedback resistance RFB2, first resistor R1With the second electricity
Hinder R2Electric current is poured into or extracted to the output end Vin of the second current source module 13.
It should be noted that PWMP signal period and PWMN signal period are identical with the period of second control signal.
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 the power supply rejection ratio PSRR of digital audio power amplification system is improved, eliminate the noise on loudspeaker.
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 (10)
1. a kind of digital audio power amplification system characterized by comprising the first current source module, the second current source module, first
Power amplifier loop, the second power amplifier loop and adjustment module；
The adjustment module includes: signal receiving unit and converting unit；
The first input end of the signal receiving unit is for receiving PWMP signal, the first output end of the signal receiving unit
It is connect with the input terminal of first current source module；
The output end of first current source module is connect with the first input end of the converting unit；
Second input terminal of the signal receiving unit is for receiving PWMN signal, the second output terminal of the signal receiving unit
It is connect with the input terminal of second current source module；
The output end of second current source module is connect with the second input terminal of the converting unit；
First output end of the converting unit is connect with the first input end of the first power amplifier loop, the converting unit
Second output terminal is connect with the first input end of the second power amplifier loop；
Wherein, the adjustment module is used to for the PWMP signal being transmitted to the first input of the first power amplifier loop always
It holds, and the PWMN signal is transmitted to the first input end of the second power amplifier loop always；
The adjustment module is also used to when the adjustment module is in the first working condition, controls first current source module
Electric current is injected or extracted to the first power amplifier loop, and is controlled second current source module and infused to the second power amplifier loop
Enter or extract electric current；When the adjustment module is in the second working condition, first current source module is controlled to described the
Electric current is extracted in the injection of two power amplifier loops, and controls second current source module and inject or extract to the first power amplifier loop
Electric current.
2. digital audio power amplification system according to claim 1, which is characterized in that the converting unit includes: first to open
Guan Guan, second switch, third switching tube and the 4th switching tube；The signal receiving unit includes: the 5th switching tube, the 6th opens
Guan Guan, the 7th switching tube and the 8th switching tube；
The input terminal of the first switch tube and the input terminal of the second switch are defeated with first current source module
Outlet connection；
The input terminal of the input terminal of the third switching tube and the 4th switching tube is defeated with second current source module
Outlet connection；
The output end of the first switch tube and the 4th switching tube connects with the first input end of the first power amplifier loop
It connects；
The output end of the second switch and the third switching tube connects with the first input end of the second power amplifier loop
It connects；
The input terminal of 5th switching tube and the 6th switching tube receives the PWMP signal；
The input terminal of 7th switching tube and the 8th switching tube receives the PWMN signal；
The output end of 5th switching tube and the 7th switching tube is connect with the input terminal of first current source module；
The output end of 6th switching tube and the 8th switching tube is connect with the input terminal of second current source module；
When the first switch tube, the third switching tube, the 5th switching tube and the 8th switching tube are on shape
When state, the second switch, the 4th switching tube, the 6th switching tube and the 7th switching tube are in cut-off shape
State；When the first switch tube, the third switching tube, the 5th switching tube and the 8th switching tube are in off state
When, the second switch, the 4th switching tube, the 6th switching tube and the 7th switching tube are in the conductive state.
3. digital audio power amplification system according to claim 2, which is characterized in that the first switch tube, described second
Switching tube, the third switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the described 7th open
The 8th switching tube is field-effect tube described in Guan Guanhe.
4. digital audio power amplification system according to claim 1, which is characterized in that the digital audio power amplification system also wraps
It includes: feedback regulation module；
The first input end of the feedback regulation module is connect with the first input end of the first power amplifier loop, and the feedback is adjusted
Second input terminal of section module is connect with the first input end of the second power amplifier loop；
First output end of the feedback regulation module is connect with the output end of the first power amplifier loop, the feedback regulation mould
The second output terminal of block is connect with the output end of the second power amplifier loop；
The control terminal of the feedback regulation module is for receiving control signal, and the control signal is for controlling the feedback regulation
Module is in different working conditions, to adjust the resistors match degree of the digital audio power amplification system, and then described in adjusting
The power supply rejection ratio of digital audio power amplification system.
5. digital audio power amplification system according to claim 4, which is characterized in that the feedback regulation module includes:
One feedback resistance, the second feedback resistance, first resistor, second resistance, 3rd resistor, the 4th resistance, first switch, second open
It closes, third switchs, the 4th switch, the 5th switch, the 6th switch, the 7th switch and the 8th switch；
The first end of first feedback resistance is connect with the first input end of the first power amplifier loop, second end respectively with institute
First switch is stated to connect with the input terminal of the second switch；
The first end of second feedback resistance is connect with the first input end of the second power amplifier loop, second end respectively with institute
The 5th switch is stated to connect with the input terminal of the 6th switch；
The output end of the first switch and the 5th switch is connect with the first end of the first resistor, first electricity
The second end of resistance is connect with the input terminal of third switch and the 7th switch respectively, the third switch and the described 4th
The output end of switch is connect with the output end of the first power amplifier loop；
The output end of the second switch and the 6th switch is connect with the first end of the 3rd resistor, the third electricity
The second end of resistance is connect with the input terminal of the 4th switch and the 8th switch respectively, the 7th switch and the described 8th
The output end of switch is connect with the output end of the second power amplifier loop；
The first end of the second resistance is connect with the first end of the first resistor, and the second end of the second resistance, which is grounded, to be connected
It connects；
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.
6. digital audio power amplification system according to claim 5, 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.
7. digital audio power amplification system according to claim 5, 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.
8. digital audio power amplification system according to claim 5, 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.
9. 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.
10. digital audio power amplification system according to claim 9, 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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| CN109068240A (en) * | 2018-08-27 | 2018-12-21 | 上海艾为电子技术股份有限公司 | A kind of digital audio power amplification system |
| CN109068240B (en) * | 2018-08-27 | 2024-02-23 | 上海艾为电子技术股份有限公司 | Digital audio power amplifier system |
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