CN104660191B - The circuit of driving load, method and device - Google Patents
The circuit of driving load, method and device Download PDFInfo
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- CN104660191B CN104660191B CN201510021480.4A CN201510021480A CN104660191B CN 104660191 B CN104660191 B CN 104660191B CN 201510021480 A CN201510021480 A CN 201510021480A CN 104660191 B CN104660191 B CN 104660191B
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Abstract
The disclosure is directed to a kind of circuit of driving load, method and device.The circuit includes：First amplifier module, when the driving current for being configured as loading is less than or equal to the maximum output current of the first amplifier module, the driving current is provided for the load；Second amplifier module, when being configured as the driving current of the load and being more than the maximum output current, the difference electric current between the driving current and the maximum output current is provided for the load.Disclosed technique scheme eliminates the THD+N of the first amplifier module introducing the feedback circuit of the second amplifier module in a manner of negative-feedback, when the driving current of load request is more than the maximum output current that the first amplifier module can be provided, the electric current of the first amplifier module deficiency is provided by the second amplifier module, therefore the THD+N performances for making drive circuit overall while the driving current of increase load is ensured are maintained.
Description
Technical field
This disclosure relates to electronic technology field, more particularly to a kind of circuit of driving load, method and device.
Background technology
The essence of drive circuit is to provide enough power outputs for load, so that load disclosure satisfy that the voltage of setting
And current requirements.In voicefrequency circuit, the driving element of electroacoustic converting unit is often through drive of the operational amplifier to load
Dynamic voltage and driving current are amplified.The output voltage of operational amplifier (abbreviation amplifier) requires very in some cases
Height, but the limitation such as the device volume loaded due to output current and heating, it is general only in milliampere (mA) rank, when needing to increase
, can be in parallel by the way that more amplifiers are carried out during the driving current of load, so as to increase the driving current of load.Loaded in increase
Driving current during, harmonic distortion plus noise (Total Harmonic Distortion+Noise, referred to as THD+
N) be able to can be deteriorated with the increase of the output current of audio drive circuitry, it is therefore desirable to ensure drive circuit THD+N performances minimum.
The content of the invention
To overcome problem present in correlation technique, the embodiment of the present disclosure provide a kind of circuit of driving load, method and
Device, in the driving current of increase load, it is ensured that the THD+N performances of drive circuit.
According to the first aspect of the embodiment of the present disclosure, there is provided a kind of circuit of driving load, including：
First amplifier module, the driving current for being configured as load are less than or equal to the first amplifier module most
During big output current, the driving current is provided for the load；
Second amplifier module, when being configured as the driving current of the load and being more than the maximum output current, for institute
Difference electric current between the load offer driving current and the maximum output current is provided；
Feedback circuit, one end of the feedback circuit is connected electrically in the inverting input of the second amplifier module, described
The other end of feedback circuit is connected electrically in the output end of the second amplifier module by first resistor device, is configured as described
During the driving current of load increases to the maximum output current, the harmonic distortion for eliminating the first amplifier module adds
Noise.
In one embodiment, the circuit may also include：
Second resistance device, it is connected electrically in the defeated of the in-phase input end of the first amplifier module and the second amplifier module
Go out between end；
3rd resistor device, the negative for being connected electrically in the output end and the first amplifier module of the first amplifier module are defeated
Between inbound port；
The second resistance device and 3rd resistor device are configured as adjusting the flat of the input current of the first amplifier module
Weighing apparatus state.
In one embodiment, the second resistance device is equal with the resistance of the 3rd resistor device.
In one embodiment, the circuit may also include：
4th resistor, it is connected electrically in the in-phase input end of the first amplifier module and bearing for the first amplifier module
Between phase input, it is configured as balancing the bias voltage of the first amplifier module.
According to the second aspect of the embodiment of the present disclosure, there is provided a kind of method of driving load, including：
When the driving current of load is less than or equal to the maximum output current of the first amplifier module, pass through described first
Amplifier module provides the driving current for the load；
It is the load by the second amplifier module when the driving current of the load is more than the maximum output current
Difference electric current between the driving current and the maximum output current is provided；
During the driving current of the load increases to the maximum output current, pass through the second amplifier mould
The feedback circuit and first resistor device of block eliminate the harmonic distortion plus noise of the first amplifier module.
In one embodiment, methods described may also include：
The poised state of the input current of the first amplifier module is adjusted by second resistance device and 3rd resistor device.
In one embodiment, the second resistance device is equal with the resistance of the 3rd resistor device.
In one embodiment, methods described may also include：
The bias voltage of the first amplifier module is balanced by the 4th resistor.
According to the second aspect of the embodiment of the present disclosure, there is provided a kind of device of driving load, including：
Processor；
For storing the memory of processor-executable instruction；
The circuit of driving load；
Wherein, the circuit of the driving load is configured as：
First amplifier module, the driving current for being configured as load are less than or equal to the first amplifier module most
During big output current, the driving current is provided for the load；
Second amplifier module, when being configured as the driving current of the load and being more than the maximum output current, for institute
Difference electric current between the load offer driving current and the maximum output current is provided；
Feedback circuit, one end of the feedback circuit is connected electrically in the inverting input of the second amplifier module, described
The other end of feedback circuit is connected electrically in the output end of the second amplifier module by first resistor device, is configured as described
During the driving current of load increases to the maximum output current, the harmonic distortion for eliminating the first amplifier module adds
Noise.
The technical scheme provided by this disclosed embodiment can include the following benefits：Pass through the anti-of the second amplifier module
Current feed circuit eliminates the THD+N of the first amplifier module introducing in a manner of negative-feedback, when the driving current of load request is more than first
During the maximum output current that amplifier module can be provided, the electric current of the first amplifier module deficiency is provided by the second amplifier module, because
This THD+N performance for making drive circuit overall while the driving current of increase load is ensured is maintained.
It should be appreciated that the general description and following detailed description of the above are only exemplary and explanatory, not
The disclosure can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the present invention
Example, and for explaining principle of the invention together with specification.
Fig. 1 is the structure chart of the circuit of the driving load according to an exemplary embodiment.
Fig. 2A is the structure chart of the circuit of the driving load according to an exemplary embodiment one.
Fig. 2 B are the THD+N and the relation schematic diagram of the driving current of load according to an exemplary embodiment one.
Fig. 3 is the flow chart of the method for the driving load according to an exemplary embodiment.
Fig. 4 is a kind of block diagram of device suitable for driving load according to an exemplary embodiment.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
Fig. 1 is the structure chart of the circuit of the driving load according to an exemplary embodiment；The circuit of the driving load
It can be electrically connected with the output end of audio decoder, the decoded analog voice information of audio decoder is driven, so as to
Earphone (load) can be driven, it is ensured that the voltage signal provided for earphone has more preferable output performance, as shown in figure 1, the drive
The circuit of dynamic load includes：
First amplifier module 11, the driving current for being configured as load 10 are less than or equal to the first amplifier module most
During big output current, driving current is provided for load 10；
Second amplifier module 12, the driving current of load 10 is configured as when being more than maximum output current, to load 10
Difference electric current between driving current and maximum output current is provided；In one embodiment, the input of the second amplifier module 12
The signal of (including in-phase input end and inverting input) input can be that decoder carries out the analog signal after digital-to-analogue conversion.
In another embodiment, the signal of the input (including in-phase input end and inverting input) of the second amplifier module 12 input can be with
Amplify and need the analog signal being driven to load to be any required.
Feedback circuit 13, one end of feedback circuit 13 are connected electrically in the inverting input of the second amplifier module 12, feedback electricity
The other end on road 13 is connected electrically in the output end of the second amplifier module 12 by first resistor device 141, is configured as in load 10
Driving current increase to maximum output current during, eliminate the first amplifier module 11 THD+N.
For example, the first amplifier module 11 and the second amplifier module 12 can be the maximum output current that load 10 provides
Imax is 20 milliamperes, when the driving current of the load requirements of (Rload) 10 can be provided less than the first amplifier module 11 it is maximum defeated
When going out electric current (Imax), the driving current of the circuit is provided by the first amplifier module 11；When the driving current that load 10 requires is big
When maximum output current (Imax) that the first amplifier module 11 can be provided, the first amplifier mould is provided by the second amplifier module 12
The electric current of the deficiency of block 11, for example, the driving current that load 10 requires is 30 milliamperes, the first amplifier module 11 and the second amplifier module
12 maximum output currents that can be provided are 20 milliamperes, in this case, it is necessary to the drive that the second amplifier module 12 provides for load 10
Streaming current is the difference electric current of 30-20=10 milliamperes.
When the output current of the first amplifier module 11 gradually increase and during not less than its maximum output current, the first amplifier mould
The THD+N performances of block 11 itself start to deteriorate, but because the feedback circuit 13 of the second amplifier module 12 can be with the side of negative-feedback
Formula eliminates the THD+N that the first amplifier module 11 introduces, therefore the THD+N performances of drive circuit entirety are maintained, when the first fortune
When the output current deficiency of amplification module 11 is to provide the driving current required for load for load, the second amplifier module 12 participates in
In output current, so that it is guaranteed that providing enough driving currents for load.
In the present embodiment, the first amplifier mould is eliminated in a manner of negative-feedback the feedback circuit 13 of the second amplifier module 12
The THD+N that block 11 introduces, when the driving current that load 10 requires is more than the maximum output electricity that the first amplifier module 11 can be provided
During stream, the electric current of the deficiency of the first amplifier module 11 is provided by the second amplifier module 12, therefore ensuring the driving electricity of increase load
The THD+N performances for making drive circuit overall while stream are maintained.
In one embodiment, circuit may also include：
Second resistance device, be connected electrically in the first amplifier module in-phase input end and the second amplifier module output end it
Between；
3rd resistor device, be connected electrically in the output end of the first amplifier module and the first amplifier module negative-phase input mouth it
Between；
Second resistance device is configured as adjusting the poised state for flowing through the first amplifier module input current with 3rd resistor device.
In one embodiment, second resistance device is equal with the resistance of 3rd resistor device.
In one embodiment, circuit may also include：
4th resistor, it is connected electrically in the in-phase input end of the first amplifier module and the negative-phase input of the first amplifier module
Between, be configured as balance the first amplifier module bias voltage.
It is specific how by the embodiment of the present disclosure to provide driving current to load, it refer to subsequent embodiment.
So far, the foregoing circuit that the embodiment of the present disclosure provides, can make while the driving current of increase load is ensured
The overall THD+N performances of drive circuit are maintained.
The technical scheme of embodiment of the present disclosure offer is provided with specific embodiment below.
Fig. 2A is the structure chart of the circuit of the driving load according to an exemplary embodiment one, and Fig. 2 B are shown according to one
THD+N and the relation schematic diagram of the driving current of load shown in example property embodiment one；The circuit of the driving load can be applied
In the output end of audio decoder, the decoded analog voice information of audio decoder is driven, so as to drive ear
Machine (load), it is ensured that the voltage signal provided for earphone has more preferable output performance, and as shown in Figure 2 A, Fig. 2A and Fig. 1 is numbered
Identical module has same or similar function, and on the basis of above-mentioned embodiment illustrated in fig. 1, the circuit of driving load is also
It can include：
Second resistance device 142, it is connected electrically in the defeated of the in-phase input end of the first amplifier module 11 and the second amplifier module 12
Go out between end；
3rd resistor device 143, the negative for being connected electrically in the output end and the first amplifier module 11 of the first amplifier module 11 are defeated
Between inbound port；
Second resistance device 142 is configured as adjustment with 3rd resistor device 143 and flows through the input current of the first amplifier module 11
Poised state.
In one embodiment, second resistance device 142 is equal with the resistance of 3rd resistor device 143.Second resistance device 142 is used as the
The input resistance of one amplifier module 11, feedback resistance of the 3rd resistor device 143 as the first amplifier module 11, passes through second resistance
Device 142 and 3rd resistor device 143 can reduce error caused by the bias current of the first amplifier module 11, it is ensured that the first amplifier mould
Block 11 is operated in the range of linearity.
In one embodiment, the circuit of driving load may also include：
4th resistor 144, it is connected electrically in the in-phase input end of the first amplifier module 11 and bearing for the first amplifier module 11
Between phase input, it is configured as balancing the bias voltage of the first amplifier module 11.Is may insure by the 4th resistor 144
One amplifier module 11 is exported with DC voltage, avoids the output current of the first amplifier module from distortion being present.
, can be according to the circuit parameter design first resistor device 141 of reality, second resistance device 142, the in circuit design
Three resistors 143, the resistance size of the 4th resistor 144, for example, the smaller resistance (example that first resistor device 141 can be designed
Such as, 1 ohm), by the resistance of second resistance device 142 and 3rd resistor device 143 and the resistance more than the 4th resistor 144.
The embodiment of the present disclosure passes through first resistor device 141, second resistance device 142,3rd resistor device 143, the 4th resistor
Bias voltage that 144 resistance is carried out to the first amplifier module 11, bigoted electric current carry out appropriate regulation, it is ensured that the first amplifier mould
The amplifier module 12 of block 11 and second is at normal amplifier state, it is ensured that the input current of the first amplifier module 11 is to load
10 driving current produces unnecessary influence.
As shown in Figure 2 B, the first amplifier module 11, the maximum output current (Imax) of the second amplifier module 12 are 20 millis
Peace, when the output current of the first amplifier module 11 gradually increase and during not less than its maximum output current (Imax), the first amplifier
The THD+N performances of module 11 itself start to deteriorate, but because the second amplifier module 12 has a feedback circuit 13 of negative-feedback, first
The THD+N that amplifier module 11 introduces will be eliminated by the feedback circuit 13 of the second amplifier module 12, so that whole driving load
The total THD+N performances of circuit maintained.When the first amplifier module 11 output current deficiency with for load provides enough
During driving current, the second amplifier module 12 starts to provide driving currents, at I0 as shown in Figure 2 B, driving load for load 10
The THD+N performances of circuit start to deteriorate, when the output current of the second amplifier module 12 reaches maximum output current, driving load
The THD+N performances of circuit reach maximum, therefore the circuit structure of the embodiment of the present disclosure is can be seen that by Fig. 2 B, realized
When only the first amplifier module 11 provides driving current for load, by the feedback circuit 13 of the second amplifier module 12 by first
The THD+N that amplifier module 11 introduces is eliminated, only when the driving current of load is beyond the maximum defeated of the first amplifier module 11 offer
When going out electric current, the THD+N of the circuit of whole driving load just starts to deteriorate, thus, by the property for improving the first amplifier module 11
Can, the circuit of driving load can be enable to provide less THD+N.
It will be appreciated by persons skilled in the art that the embodiment of the present disclosure is reduced by way of above-mentioned two stage amplifer module
The THD+N of the circuit of driving load, but the mode of two stage amplifer module can not form the limitation to the embodiment of the present disclosure, in electricity
Under conditions of road design allows, more amplifier modules can be used to realize the amplifier of more stages by the embodiment of the present disclosure, from
And the circuit of driving load is set to provide smaller THD+N.
Fig. 3 is the flow chart of the method for the driving load according to an exemplary embodiment；As shown in figure 3, driving is negative
The method of load comprises the following steps：
In step S301, when the driving current of load is less than or equal to the maximum output current of the first amplifier module
When, provide driving current by the first amplifier module for load；
In step s 302, it is negative by the second amplifier module when the driving current of load is more than maximum output current
Difference electric current between offer driving current and maximum output current is provided；
In step S303, during the driving current of load increases to maximum output current, pass through the second amplifier
The feedback circuit and first resistor device of module eliminate the harmonic distortion plus noise of the first amplifier module.
In the present embodiment, the first amplifier module is eliminated in a manner of negative-feedback the feedback circuit of the second amplifier module and drawn
The THD+N entered, when the driving current of load request is more than the maximum output current that the first amplifier module can be provided, by second
Amplifier module provides the electric current of the first amplifier module deficiency, therefore makes driving electric while the driving current of increase load is ensured
The overall THD+N performances in road are maintained.
In one embodiment, the method for driving load may also include：
The poised state of the input current of the first amplifier module is adjusted by second resistance device and 3rd resistor device.
In one embodiment, second resistance device can be with equal with the resistance of 3rd resistor device.
In one embodiment, the method for driving load may also include：
The bias voltage of the first amplifier module is balanced by the 4th resistor.
On the method flow in above-described embodiment, wherein the concrete mode that each step performs is in the relevant driving
It is described in detail in the circuit embodiments of load, explanation will be not set forth in detail herein.
Fig. 4 is a kind of block diagram of device suitable for driving load according to an exemplary embodiment.For example, device
400 can be mobile phone, computer, digital broadcast terminal, messaging devices, game console, tablet device, and medical treatment is set
It is standby, body-building equipment, personal digital assistant etc..
Reference picture 4, device 400 can include following one or more assemblies：Processing component 402, memory 404, power supply
Component 404, multimedia groupware 408, audio-frequency assembly 410, the interface 412 of input/output (I/O), sensor cluster 414, and
Communication component 416.
The integrated operation of the usual control device 400 of processing component 402, such as communicated with display, call, data, phase
The operation that machine operates and record operation is associated.Treatment element 402 can refer to including one or more processors 420 to perform
Order, to complete all or part of step of above-mentioned method.In addition, processing component 402 can include one or more modules, just
Interaction between processing component 402 and other assemblies.For example, processing component 402 can include multi-media module, it is more to facilitate
Interaction between media component 408 and processing component 402.
Memory 404 is configured as storing various types of data to support the operation in equipment 400.These data are shown
Example includes the instruction of any application program or method for being operated on device 400, contact data, telephone book data, disappears
Breath, picture, video etc..Memory 404 can be by any kind of volatibility or non-volatile memory device or their group
Close and realize, as static RAM (SRAM), Electrically Erasable Read Only Memory (EEPROM) are erasable to compile
Journey read-only storage (EPROM), programmable read only memory (PROM), read-only storage (ROM), magnetic memory, flash
Device, disk or CD.
Electric power assembly 406 provides electric power for the various assemblies of device 400.Electric power assembly 406 can include power management system
System, one or more power supplys, and other components associated with generating, managing and distributing electric power for device 400.
Multimedia groupware 408 is included in the screen of one output interface of offer between described device 400 and user.One
In a little embodiments, screen can include liquid crystal display (LCD) and touch panel (TP).If screen includes touch panel, screen
Curtain may be implemented as touch-screen, to receive the input signal from user.Touch panel includes one or more touch sensings
Device is with the gesture on sensing touch, slip and touch panel.The touch sensor can not only sensing touch or sliding action
Border, but also detect and touched or the related duration and pressure of slide with described.In certain embodiments, more matchmakers
Body component 408 includes a front camera and/or rear camera.When equipment 400 is in operator scheme, such as screening-mode or
During video mode, front camera and/or rear camera can receive outside multi-medium data.Each front camera and
Rear camera can be a fixed optical lens system or have focusing and optical zoom capabilities.
Audio-frequency assembly 410 is configured as output and/or input audio signal.For example, audio-frequency assembly 410 includes a Mike
Wind (MIC), when device 400 is in operator scheme, during such as call model, logging mode and speech recognition mode, microphone by with
It is set to reception external audio signal.The audio signal received can be further stored in memory 404 or via communication set
Part 416 is sent.In certain embodiments, audio-frequency assembly 410 also includes a loudspeaker, for exports audio signal.
I/O interfaces 412 provide interface between processing component 402 and peripheral interface module, and above-mentioned peripheral interface module can
To be keyboard, click wheel, button etc..These buttons may include but be not limited to：Home button, volume button, start button and lock
Determine button.
Sensor cluster 414 includes one or more sensors, and the state for providing various aspects for device 400 is commented
Estimate.For example, sensor cluster 414 can detect opening/closed mode of equipment 400, and the relative positioning of component, for example, it is described
Component is the display and keypad of device 400, and sensor cluster 414 can be with 400 1 components of detection means 400 or device
Position change, the existence or non-existence that user contacts with device 400, the orientation of device 400 or acceleration/deceleration and device 400
Temperature change.Sensor cluster 414 can include proximity transducer, be configured to detect in no any physical contact
The presence of neighbouring object.Sensor cluster 414 can also include optical sensor, such as CMOS or ccd image sensor, for into
As being used in application.In certain embodiments, the sensor cluster 414 can also include acceleration transducer, gyro sensors
Device, Magnetic Sensor, pressure sensor or temperature sensor.
Communication component 416 is configured to facilitate the communication of wired or wireless way between device 400 and other equipment.Device
400 can access the wireless network based on communication standard, such as WiFi, 2G or 3G, or combinations thereof.In an exemplary implementation
In example, communication component 416 receives broadcast singal or broadcast related information from external broadcasting management system via broadcast channel.
In one exemplary embodiment, the communication component 416 also includes near-field communication (NFC) module, to promote junction service.Example
Such as, in NFC module radio frequency identification (RFID) technology can be based on, Infrared Data Association (IrDA) technology, ultra wide band (UWB) technology,
Bluetooth (BT) technology and other technologies are realized.
In the exemplary embodiment, device 400 can be believed by one or more application specific integrated circuits (ASIC), numeral
Number processor (DSP), digital signal processing appts (DSPD), PLD (PLD), field programmable gate array
(FPGA), controller, microcontroller, microprocessor or other electronic components are realized, for performing the above method.
In the exemplary embodiment, a kind of non-transitorycomputer readable storage medium including instructing, example are additionally provided
Such as include the memory 404 of instruction, above-mentioned instruction can be performed to complete the above method by the processor 420 of device 400.For example,
The non-transitorycomputer readable storage medium can be ROM, random access memory (RAM), CD-ROM, tape, floppy disk
With optical data storage devices etc..
Those skilled in the art will readily occur to the disclosure its after considering specification and putting into practice disclosure disclosed herein
Its embodiment.The application is intended to any modification, purposes or the adaptations of the disclosure, these modifications, purposes or
Person's adaptations follow the general principle of the disclosure and including the undocumented common knowledges in the art of the disclosure
Or conventional techniques.Description and embodiments are considered only as exemplary, and the true scope of the disclosure and spirit are by following
Claim is pointed out.
It should be appreciated that the precision architecture that the disclosure is not limited to be described above and is shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present disclosure is only limited by appended claim.
Claims (9)
1. a kind of circuit of driving load, it is characterised in that the circuit includes：
First amplifier module, the driving current for being configured as load are less than or equal to the maximum defeated of the first amplifier module
When going out electric current, the driving current is provided for the load；
Second amplifier module, when being configured as the driving current of the load and being more than the maximum output current, to be described negative
Difference electric current between the offer driving current and the maximum output current is provided；The homophase input of the first amplifier module
End electrically connects with the output end of the second amplifier module；The output end of the second amplifier module also by first resistor device with
The output end electrical connection of the first amplifier module；
Feedback circuit, one end of the feedback circuit are connected electrically in the inverting input of the second amplifier module, the feedback
The other end of circuit is connected electrically in the output end of the second amplifier module by the first resistor device, the feedback circuit
Output end of the other end also with the first amplifier module electrically connects, and the driving current being configured as in the load increases to institute
During stating maximum output current, the harmonic distortion plus noise of the first amplifier module is eliminated.
2. circuit according to claim 1, it is characterised in that the circuit also includes：
Second resistance device, it is connected electrically in the in-phase input end of the first amplifier module and the output end of the second amplifier module
Between；
3rd resistor device, it is connected electrically in the output end of the first amplifier module and the negative-phase input of the first amplifier module
Between mouthful；
The second resistance device is configured as adjusting the equilibrium-like of the input current of the first amplifier module with 3rd resistor device
State.
3. circuit according to claim 2, it is characterised in that the resistance of the second resistance device and the 3rd resistor device
It is equal.
4. circuit according to claim 1, it is characterised in that the circuit also includes：
4th resistor, be connected electrically in the first amplifier module in-phase input end and the first amplifier module negative it is defeated
Between entering end, it is configured as balancing the bias voltage of the first amplifier module.
A kind of 5. method of driving load, it is characterised in that methods described includes：
When the driving current of load is less than or equal to the maximum output current of the first amplifier module, pass through first amplifier
Module provides the driving current for the load；
When the driving current of the load is more than the maximum output current, provided by the second amplifier module for the load
Difference electric current between the driving current and the maximum output current；The in-phase input end of the first amplifier module and institute
State the output end electrical connection of the second amplifier module；The output end of the second amplifier module also passes through first resistor device and described the
The output end electrical connection of one amplifier module；
During the driving current of the load increases to the maximum output current, pass through the second amplifier module
Feedback circuit and the first resistor device eliminate the harmonic distortion plus noise of the first amplifier module；The one of the feedback circuit
End is connected electrically in the inverting input of the second amplifier module, and the other end of the feedback circuit passes through the first resistor device
The output end of the second amplifier module is connected electrically in, the other end of the feedback circuit is also defeated with the first amplifier module
Go out end electrical connection.
6. according to the method for claim 5, it is characterised in that methods described also includes：
The poised state of the input current of the first amplifier module is adjusted by second resistance device and 3rd resistor device.
7. according to the method for claim 6, it is characterised in that the resistance of the second resistance device and the 3rd resistor device
It is equal.
8. according to the method for claim 5, it is characterised in that methods described also includes：
The bias voltage of the first amplifier module is balanced by the 4th resistor.
9. a kind of device of driving load, it is characterised in that described device includes：
Processor；
For storing the memory of processor-executable instruction；
The circuit of driving load；
Wherein, the circuit of the driving load is configured as：
First amplifier module, the driving current for being configured as load are less than or equal to the maximum defeated of the first amplifier module
When going out electric current, the driving current is provided for the load；
Second amplifier module, when being configured as the driving current of the load and being more than the maximum output current, to be described negative
Difference electric current between the offer driving current and the maximum output current is provided；The homophase input of the first amplifier module
End electrically connects with the output end of the second amplifier module；The output end of the second amplifier module also by first resistor device with
The output end electrical connection of the first amplifier module；
Feedback circuit, one end of the feedback circuit are connected electrically in the inverting input of the second amplifier module, the feedback
The other end of circuit is connected electrically in the output end of the second amplifier module by the first resistor device, the feedback circuit
Output end of the other end also with the first amplifier module electrically connects, and the driving current being configured as in the load increases to institute
During stating maximum output current, the harmonic distortion plus noise of the first amplifier module is eliminated.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1738141A (en) * | 2004-08-18 | 2006-02-22 | 台达电子工业股份有限公司 | Master-slave current distribution circuit |
| CN101416386A (en) * | 2004-03-11 | 2009-04-22 | Gct半导体公司 | Highly linear variable gain amplifier |
| US7990126B1 (en) * | 2006-07-20 | 2011-08-02 | Marvell International, Ltd. | Low power DC-DC converter with improved load regulation |
| CN103163925A (en) * | 2011-12-15 | 2013-06-19 | 无锡中星微电子有限公司 | High efficiency low drop-out voltage regulator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8912773B2 (en) * | 2011-01-20 | 2014-12-16 | International Rectifier Corporation | Synchronous buck converter including multi-mode control for light load efficiency and related method |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101416386A (en) * | 2004-03-11 | 2009-04-22 | Gct半导体公司 | Highly linear variable gain amplifier |
| CN1738141A (en) * | 2004-08-18 | 2006-02-22 | 台达电子工业股份有限公司 | Master-slave current distribution circuit |
| US7990126B1 (en) * | 2006-07-20 | 2011-08-02 | Marvell International, Ltd. | Low power DC-DC converter with improved load regulation |
| CN103163925A (en) * | 2011-12-15 | 2013-06-19 | 无锡中星微电子有限公司 | High efficiency low drop-out voltage regulator |
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