CN104660191A - Circuit, method and device for driving load - Google Patents
Circuit, method and device for driving load Download PDFInfo
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- CN104660191A CN104660191A CN201510021480.4A CN201510021480A CN104660191A CN 104660191 A CN104660191 A CN 104660191A CN 201510021480 A CN201510021480 A CN 201510021480A CN 104660191 A CN104660191 A CN 104660191A
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Abstract
The invention relates to a circuit, a method and a device for driving a load. The circuit comprises a first operational amplifier module and a second operational amplifier module, wherein the first operational amplifier module is configured for supplying driving current to the load when the driving current of the load is less than or equal to the maximum output current of the first operational amplifier module; the second operational amplifier module is configured for supplying difference current between the driving current and the maximum output current to the load when the driving current of the load is greater than the maximum output current. According to the technical scheme, THD+N (Total Harmonic Distortion + Noise) which is introduced by the first operational amplifier module is removed in a negative feedback way through a feedback circuit of the second operational amplifier module, insufficient current of the first operational amplifier module can be supplied by the second operational amplifier module when the driving current which is required by the load is greater than the maximum output current which can be supplied by the first operational amplifier module, and thus the integral THD+N performance of a driving circuit can be maintained while the driving current of the load is enabled to be increased.
Description
Technical field
The disclosure relates to electronic technology field, particularly relates to a kind of circuit, method and the device that drive load.
Background technology
The essence of drive circuit is for load provides enough power outputs, thus enables load meet voltage and the current requirements of setting.In voicefrequency circuit, the driving element of electroacoustic converting unit amplifies the driving voltage of load and drive current often through operational amplifier.The output voltage of operational amplifier (abbreviation amplifier) requires very high in some cases, but because output current is by restrictions such as the device volume of load and heatings, general only in milliampere (mA) rank, when needing the drive current increasing load, by many amplifiers are carried out parallel connection, thus the drive current of load can be increased.In the process of drive current increasing load, harmonic distortion plus noise (Total Harmonic Distortion+Noise, referred to as THD+N) can be able to be deteriorated along with the increase of the output current of audio drive circuitry, therefore need to guarantee that drive circuit THD+N performance is minimum.
Summary of the invention
For overcoming Problems existing in correlation technique, disclosure embodiment provides a kind of circuit, method and the device that drive load, in order to when increasing the drive current of load, guarantees the THD+N performance of drive circuit.
According to the first aspect of disclosure embodiment, a kind of circuit driving load is provided, comprises:
First amplifier module, is configured to when the drive current of load is less than or equal to the maximum output current of described first amplifier module, for described load provides described drive current;
Second amplifier module, is configured to when the drive current of described load is greater than described maximum output current, for described load provides the electric current of the difference between described drive current and described maximum output current;
Feedback circuit, one end of described feedback circuit is connected electrically in the inverting input of described second amplifier module, the other end of described feedback circuit is connected electrically in the output of described second amplifier module by the first resistor, be configured to increase in the process of described maximum output current at the drive current of described load, eliminate the harmonic distortion plus noise of described first amplifier module.
In one embodiment, described circuit also can comprise:
Second resistor, is connected electrically between the in-phase input end of described first amplifier module and the output of described second amplifier module;
3rd resistor, is connected electrically between the output of described first amplifier module and the negative-phase input mouth of described first amplifier module;
Described second resistor and the 3rd resistor are configured to the poised state of the input current adjusting described first amplifier module.
In one embodiment, described second resistor is equal with the resistance of described 3rd resistor.
In one embodiment, described circuit also can comprise:
4th resistor, is connected electrically between the in-phase input end of described first amplifier module and the negative-phase input of described first amplifier module, is configured to the bias voltage balancing described first amplifier module.
According to the second aspect of disclosure embodiment, a kind of method driving load is provided, comprises:
When the drive current of load is less than or equal to the maximum output current of the first amplifier module, by described first amplifier module for described load provides described drive current;
When the drive current of described load is greater than described maximum output current, by the second amplifier module for described load provides the electric current of the difference between described drive current and described maximum output current;
Increase in the process of described maximum output current at the drive current of described load, by the feedback circuit of described second amplifier module and the harmonic distortion plus noise of the described first amplifier module of the first resistor elimination.
In one embodiment, described method also can comprise:
The poised state of the input current of described first amplifier module is adjusted by the second resistor and the 3rd resistor.
In one embodiment, described second resistor is equal with the resistance of described 3rd resistor.
In one embodiment, described method also can comprise:
By the bias voltage of the described first amplifier module of the 4th resistor balance.
According to the second aspect of disclosure embodiment, a kind of device driving load is provided, comprises:
Processor;
For the memory of storage of processor executable instruction;
Drive the circuit of load;
Wherein, the circuit of described driving load is configured to:
First amplifier module, is configured to when the drive current of load is less than or equal to the maximum output current of described first amplifier module, for described load provides described drive current;
Second amplifier module, is configured to when the drive current of described load is greater than described maximum output current, for described load provides the electric current of the difference between described drive current and described maximum output current;
Feedback circuit, one end of described feedback circuit is connected electrically in the inverting input of described second amplifier module, the other end of described feedback circuit is connected electrically in the output of described second amplifier module by the first resistor, be configured to increase in the process of described maximum output current at the drive current of described load, eliminate the harmonic distortion plus noise of described first amplifier module.
The technical scheme that embodiment of the present disclosure provides can comprise following beneficial effect: eliminate in degenerative mode the THD+N that the first amplifier module introduces by the feedback circuit of the second amplifier module, when the drive current of load request is greater than the maximum output current that the first amplifier module can provide, the electric current of the first amplifier module deficiency is provided by the second amplifier module, therefore while the drive current guaranteeing increase load, the THD+N performance of drive circuit entirety is maintained.
Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the disclosure.
Accompanying drawing explanation
Accompanying drawing to be herein merged in specification and to form the part of this specification, shows embodiment according to the invention, and is used from specification one and explains principle of the present invention.
Fig. 1 is the structure chart of the circuit of driving load according to an exemplary embodiment.
Fig. 2 A is the structure chart of the circuit of driving load according to an exemplary embodiment one.
Fig. 2 B is the relation schematic diagram of the drive current of THD+N according to an exemplary embodiment one and load.
Fig. 3 is the flow chart of the method for driving load according to an exemplary embodiment.
Fig. 4 is a kind of block diagram being applicable to the device driving load according to an exemplary embodiment.
Embodiment
Here will be described exemplary embodiment in detail, its sample table shows in the accompanying drawings.When description below relates to accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawing represents same or analogous key element.Execution mode described in following exemplary embodiment does not represent all execution modes consistent with the present invention.On the contrary, they only with as in appended claims describe in detail, the example of apparatus and method that aspects more of the present invention are consistent.
Fig. 1 is the structure chart of the circuit of driving load according to an exemplary embodiment; The circuit of this driving load can be electrically connected with the output of audio decoder, analog voice information after audio decoder decode is driven, thus earphone (load) can be driven, the voltage signal ensuring earphone to provide has better output performance, as shown in Figure 1, the circuit of this driving load comprises:
First amplifier module 11, is configured to when the drive current of load 10 is less than or equal to the maximum output current of the first amplifier module, for load 10 provides drive current;
Second amplifier module 12, is configured to when the drive current of load 10 is greater than maximum output current, for load 10 provides the electric current of the difference between drive current and maximum output current; In one embodiment, the signal that the input (comprising in-phase input end and inverting input) of the second amplifier module 12 inputs can carry out the analog signal after digital-to-analogue conversion for decoder.In another embodiment, the signal that inputs of the input (comprising in-phase input end and inverting input) of the second amplifier module 12 can amplify for any needs and need the analog signal that drives load.
Feedback circuit 13, one end of feedback circuit 13 is connected electrically in the inverting input of the second amplifier module 12, the other end of feedback circuit 13 is connected electrically in the output of the second amplifier module 12 by the first resistor 141, be configured to increase in the process of maximum output current at the drive current of load 10, eliminate the THD+N of the first amplifier module 11.
Such as, the maximum output current Imax that first amplifier module 11 and the second amplifier module 12 all can provide for load 10 is 20 milliamperes, when the drive current that load (Rload) 10 requires is less than maximum output current (Imax) that the first amplifier module 11 can provide, the drive current of this circuit is provided by the first amplifier module 11; When the drive current that load 10 requires is greater than maximum output current (Imax) that the first amplifier module 11 can provide, the electric current of the first amplifier module 11 deficiency is provided by the second amplifier module 12, such as, the drive current that load 10 requires is 30 milliamperes, the maximum output current that first amplifier module 11 and the second amplifier module 12 can provide is 20 milliamperes, in this case, need the second amplifier module 12 for drive current that load 10 provides be the difference electric current of 30-20=10 milliampere.
When the output current of the first amplifier module 11 increases gradually and does not exceed its maximum output current, the THD+N performance of the first amplifier module 11 itself starts deterioration, but the feedback circuit 13 due to the second amplifier module 12 can eliminate the THD+N of the first amplifier module 11 introducing in degenerative mode, therefore the THD+N performance of drive circuit entirety is maintained, when the output current deficiency of the first amplifier module 11 thinks the drive current that load provides required for load, second amplifier module 12 participates in output current, thus ensures the drive current that load provides enough.
In the present embodiment, eliminate in degenerative mode the THD+N that the first amplifier module 11 introduces by the feedback circuit 13 of the second amplifier module 12, when the drive current that load 10 requires is greater than the maximum output current that the first amplifier module 11 can provide, the electric current of the first amplifier module 11 deficiency is provided by the second amplifier module 12, therefore while the drive current guaranteeing increase load, the THD+N performance of drive circuit entirety is maintained.
In one embodiment, circuit also can comprise:
Second resistor, is connected electrically between the in-phase input end of the first amplifier module and the output of the second amplifier module;
3rd resistor, is connected electrically between the output of the first amplifier module and the negative-phase input mouth of the first amplifier module;
Second resistor and the 3rd resistor are configured to adjust the poised state flowing through the first amplifier module input current.
In one embodiment, the second resistor is equal with the resistance of the 3rd resistor.
In one embodiment, circuit also can comprise:
4th resistor, is connected electrically between the in-phase input end of the first amplifier module and the negative-phase input of the first amplifier module, is configured to the bias voltage of balance first amplifier module.
Concrete how provide drive current by disclosure embodiment for load, please refer to subsequent embodiment.
So far, the foregoing circuit that disclosure embodiment provides, can make the THD+N performance of drive circuit entirety be maintained while the drive current guaranteeing increase load.
With specific embodiment, the technical scheme that disclosure embodiment provides is described below.
Fig. 2 A is the structure chart of the circuit of driving load according to an exemplary embodiment one, and Fig. 2 B is the relation schematic diagram of the drive current of THD+N according to an exemplary embodiment one and load; The circuit of this driving load can be applied in the output of audio decoder, analog voice information after audio decoder decode is driven, thus earphone (load) can be driven, the voltage signal ensuring earphone to provide has better output performance, as shown in Figure 2 A, Fig. 2 A and Fig. 1 numbers identical module and has identical or similar function, on above-mentioned basis embodiment illustrated in fig. 1, drives the circuit of load to comprise:
Second resistor 142, is connected electrically between the in-phase input end of the first amplifier module 11 and the output of the second amplifier module 12;
3rd resistor 143, is connected electrically between the output of the first amplifier module 11 and the negative-phase input mouth of the first amplifier module 11;
Second resistor 142 and the 3rd resistor 143 are configured to adjust the poised state flowing through the first amplifier module 11 input current.
In one embodiment, the second resistor 142 is equal with the 3rd resistor 143 resistance.Second resistor 142 is as the input resistance of the first amplifier module 11,3rd resistor 143 is as the feedback resistance of the first amplifier module 11, the error that the bias current that can reduce the first amplifier module 11 by the second resistor 142 and the 3rd resistor 143 causes, guarantees that the first amplifier module 11 is operated in the range of linearity.
In one embodiment, the circuit of load is driven also can to comprise:
4th resistor 144, is connected electrically between the in-phase input end of the first amplifier module 11 and the negative-phase input of the first amplifier module 11, is configured to the bias voltage of balance first amplifier module 11.Can guarantee that the first amplifier module 11 exports with direct voltage by the 4th resistor 144, avoid the output current of the first amplifier module to there is distortion.
In circuit design, can according to the resistance size of circuit parameter design first resistor 141, second resistor 142 of reality, the 3rd resistor 143, the 4th resistor 144, such as, the less resistance that the first resistor 141 can be designed (such as, 1 ohm), by the resistance of the second resistor 142 and the 3rd resistor 143 and the resistance being greater than the 4th resistor 144.
Bias voltage, bigoted electric current that disclosure embodiment is carried out the first amplifier module 11 by the resistance of the first resistor 141, second resistor 142, the 3rd resistor 143, the 4th resistor 144 carry out suitable adjustment, guarantee that the first amplifier module 11 and the second amplifier module 12 can be in normal amplifier state, guarantee that the drive current of input current on load 10 of the first amplifier module 11 produces unnecessary impact.
As shown in Figure 2 B, the maximum output current (Imax) of the first amplifier module 11, second amplifier module 12 is 20 milliamperes, when the output current of the first amplifier module 11 increases gradually and does not exceed its maximum output current (Imax), the THD+N performance of the first amplifier module 11 itself starts deterioration, but because the second amplifier module 12 exists degenerative feedback circuit 13, the THD+N that first amplifier module 11 is introduced eliminates by the feedback circuit 13 of the second amplifier module 12, thus the total THD+N performance of the circuit of whole driving load is maintained.When the output current deficiency of the first amplifier module 11 thinks the drive current that load provides enough, second amplifier module 12 starts as load 10 provides drive current, I0 place as shown in Figure 2 B, the THD+N performance of the circuit of load is driven to start deterioration, when the output current of the second amplifier module 12 reaches maximum output current, the THD+N performance of the circuit of load is driven to reach maximum, therefore can be found out by Fig. 2 B, the circuit structure of disclosure embodiment, achieve when only having the first amplifier module 11 to provide drive current for load, the THD+N first amplifier module 11 introduced by the feedback circuit 13 of the second amplifier module 12 is eliminated, during only have the drive current when load to exceed maximum output current that the first amplifier module 11 provides, the THD+N of the circuit of whole driving load just starts deterioration, thus, by improving the performance of the first amplifier module 11, the THD+N that the circuit of driving load provides less can be enable.
It will be understood by those skilled in the art that, disclosure embodiment reduces the THD+N of the circuit driving load by the mode of above-mentioned two stage amplifer module, but the mode of two stage amplifer module can not form the restriction to disclosure embodiment, under the condition that circuit design allows, more amplifier module can be adopted to realize more multistage amplifier by disclosure embodiment, thus make the THD+N that the circuit of driving load provides less.
Fig. 3 is the flow chart of the method for driving load according to an exemplary embodiment; As shown in Figure 3, the method for load is driven to comprise the steps:
In step S301, when the drive current of load is less than or equal to the maximum output current of the first amplifier module, by the first amplifier module for load provides drive current;
In step s 302, when the drive current of load is greater than maximum output current, by the second amplifier module for load provides the electric current of the difference between drive current and maximum output current;
In step S303, increase in the process of maximum output current at the drive current of load, eliminated the harmonic distortion plus noise of the first amplifier module by the feedback circuit of the second amplifier module and the first resistor.
In the present embodiment, eliminate in degenerative mode the THD+N that the first amplifier module introduces by the feedback circuit of the second amplifier module, when the drive current of load request is greater than the maximum output current that the first amplifier module can provide, the electric current of the first amplifier module deficiency is provided by the second amplifier module, therefore while the drive current guaranteeing increase load, the THD+N performance of drive circuit entirety is maintained.
In one embodiment, the method for load is driven also can to comprise:
The poised state of the input current of the first amplifier module is adjusted by the second resistor and the 3rd resistor.
In one embodiment, the second resistor can be equal with the resistance of the 3rd resistor.
In one embodiment, the method for load is driven also can to comprise:
The bias voltage of the first amplifier module is balanced by the 4th resistor.
About the method flow in above-described embodiment, the concrete mode that wherein each step performs has been described in detail in the circuit embodiments about this driving load, will not elaborate explanation herein.
Fig. 4 is a kind of block diagram being applicable to the device driving load according to an exemplary embodiment.Such as, device 400 can be mobile phone, computer, digital broadcast terminal, messaging devices, game console, flat-panel devices, Medical Devices, body-building equipment, personal digital assistant etc.
With reference to Fig. 4, device 400 can comprise following one or more assembly: processing components 402, memory 404, power supply module 404, multimedia groupware 408, audio-frequency assembly 410, the interface 412 of I/O (I/O), sensor cluster 414, and communications component 416.
The integrated operation of the usual control device 400 of processing components 402, such as with display, call, data communication, camera operation and record operate the operation be associated.Treatment element 402 can comprise one or more processor 420 to perform instruction, to complete all or part of step of above-mentioned method.In addition, processing components 402 can comprise one or more module, and what be convenient between processing components 402 and other assemblies is mutual.Such as, processing unit 402 can comprise multi-media module, mutual with what facilitate between multimedia groupware 408 and processing components 402.
Memory 404 is configured to store various types of data to be supported in the operation of equipment 400.The example of these data comprises for any application program of operation on device 400 or the instruction of method, contact data, telephone book data, message, picture, video etc.Memory 404 can be realized by the volatibility of any type or non-volatile memory device or their combination, as static RAM (SRAM), Electrically Erasable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory EPROM (EPROM), programmable read only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, disk or CD.
The various assemblies that electric power assembly 406 is device 400 provide electric power.Electric power assembly 406 can comprise power-supply management system, one or more power supply, and other and the assembly generating, manage and distribute electric power for device 400 and be associated.
Multimedia groupware 408 is included in the screen providing an output interface between described device 400 and user.In certain embodiments, screen can comprise liquid crystal display (LCD) and touch panel (TP).If screen comprises touch panel, screen may be implemented as touch-screen, to receive the input signal from user.Touch panel comprises one or more touch sensor with the gesture on sensing touch, slip and touch panel.Described touch sensor can the border of not only sensing touch or sliding action, but also detects the duration relevant to described touch or slide and pressure.In certain embodiments, multimedia groupware 408 comprises a front-facing camera and/or post-positioned pick-up head.When equipment 400 is in operator scheme, during as screening-mode or video mode, front-facing camera and/or post-positioned pick-up head can receive outside multi-medium data.Each front-facing camera and post-positioned pick-up head can be fixing optical lens systems or have focal length and optical zoom ability.
Audio-frequency assembly 410 is configured to export and/or input audio signal.Such as, audio-frequency assembly 410 comprises a microphone (MIC), and when device 400 is in operator scheme, during as call model, logging mode and speech recognition mode, microphone is configured to receive external audio signal.The audio signal received can be stored in memory 404 further or be sent via communications component 416.In certain embodiments, audio-frequency assembly 410 also comprises a loud speaker, for output audio signal.
I/O interface 412 is for providing interface between processing components 402 and peripheral interface module, and above-mentioned peripheral interface module can be keyboard, some striking wheel, button etc.These buttons can include but not limited to: home button, volume button, start button and locking press button.
Sensor cluster 414 comprises one or more transducer, for providing the state estimation of various aspects for device 400.Such as, sensor cluster 414 can detect the opening/closing state of equipment 400, the relative positioning of assembly, such as described assembly is display and the keypad of device 400, the position of all right checkout gear 400 of sensor cluster 414 or device 400 1 assemblies changes, the presence or absence that user contacts with device 400, the variations in temperature of device 400 orientation or acceleration/deceleration and device 400.Sensor cluster 414 can comprise proximity transducer, be configured to without any physical contact time detect near the existence of object.Sensor cluster 414 can also comprise optical sensor, as CMOS or ccd image sensor, for using in imaging applications.In certain embodiments, this sensor cluster 414 can also comprise acceleration transducer, gyro sensor, Magnetic Sensor, pressure sensor or temperature sensor.
Communications component 416 is configured to the communication being convenient to wired or wireless mode between device 400 and other equipment.Device 400 can access the wireless network based on communication standard, as WiFi, 2G or 3G, or their combination.In one exemplary embodiment, communication component 416 receives from the broadcast singal of external broadcasting management system or broadcast related information via broadcast channel.In one exemplary embodiment, described communication component 416 also comprises near-field communication (NFC) module, to promote junction service.Such as, can based on radio-frequency (RF) identification (RFID) technology in NFC module, Infrared Data Association (IrDA) technology, ultra broadband (UWB) technology, bluetooth (BT) technology and other technologies realize.
In the exemplary embodiment, device 400 can be realized, for performing said method by one or more application specific integrated circuit (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), controller, microcontroller, microprocessor or other electronic components.
In the exemplary embodiment, additionally provide a kind of non-transitory computer-readable recording medium comprising instruction, such as, comprise the memory 404 of instruction, above-mentioned instruction can perform said method by the processor 420 of device 400.Such as, described non-transitory computer-readable recording medium can be ROM, random access memory (RAM), CD-ROM, tape, floppy disk and optical data storage devices etc.
Those skilled in the art, at consideration specification and after putting into practice disclosed herein disclosing, will easily expect other embodiment of the present disclosure.The application is intended to contain any modification of the present disclosure, purposes or adaptations, and these modification, purposes or adaptations are followed general principle of the present disclosure and comprised the undocumented common practise in the art of the disclosure or conventional techniques means.Specification and embodiment are only regarded as exemplary, and true scope of the present disclosure and spirit are pointed out by claim below.
Should be understood that, the disclosure is not limited to precision architecture described above and illustrated in the accompanying drawings, and can carry out various amendment and change not departing from its scope.The scope of the present disclosure is only limited by appended claim.
Claims (9)
1. drive a circuit for load, it is characterized in that, described circuit comprises:
First amplifier module, is configured to when the drive current of load is less than or equal to the maximum output current of described first amplifier module, for described load provides described drive current;
Second amplifier module, is configured to when the drive current of described load is greater than described maximum output current, for described load provides the electric current of the difference between described drive current and described maximum output current;
Feedback circuit, one end of described feedback circuit is connected electrically in the inverting input of described second amplifier module, the other end of described feedback circuit is connected electrically in the output of described second amplifier module by the first resistor, be configured to increase in the process of described maximum output current at the drive current of described load, eliminate the harmonic distortion plus noise of described first amplifier module.
2. circuit according to claim 1, is characterized in that, described circuit also comprises:
Second resistor, is connected electrically between the in-phase input end of described first amplifier module and the output of described second amplifier module;
3rd resistor, is connected electrically between the output of described first amplifier module and the negative-phase input mouth of described first amplifier module;
Described second resistor and the 3rd resistor are configured to the poised state of the input current adjusting described first amplifier module.
3. circuit according to claim 2, is characterized in that, described second resistor is equal with the resistance of described 3rd resistor.
4. circuit according to claim 1, is characterized in that, described circuit also comprises:
4th resistor, is connected electrically between the in-phase input end of described first amplifier module and the negative-phase input of described first amplifier module, is configured to the bias voltage balancing described first amplifier module.
5. drive a method for load, it is characterized in that, described method comprises:
When the drive current of load is less than or equal to the maximum output current of the first amplifier module, by described first amplifier module for described load provides described drive current;
When the drive current of described load is greater than described maximum output current, by the second amplifier module for described load provides the electric current of the difference between described drive current and described maximum output current;
Increase in the process of described maximum output current at the drive current of described load, by the feedback circuit of described second amplifier module and the harmonic distortion plus noise of the described first amplifier module of the first resistor elimination.
6. method according to claim 5, is characterized in that, described method also comprises:
The poised state of the input current of described first amplifier module is adjusted by the second resistor and the 3rd resistor.
7. method according to claim 6, is characterized in that, described second resistor is equal with the resistance of described 3rd resistor.
8. method according to claim 5, is characterized in that, described method also comprises:
By the bias voltage of the described first amplifier module of the 4th resistor balance.
9. drive a device for load, it is characterized in that, described device comprises:
Processor;
For the memory of storage of processor executable instruction;
Drive the circuit of load;
Wherein, the circuit of described driving load is configured to:
First amplifier module, is configured to when the drive current of load is less than or equal to the maximum output current of described first amplifier module, for described load provides described drive current;
Second amplifier module, is configured to when the drive current of described load is greater than described maximum output current, for described load provides the electric current of the difference between described drive current and described maximum output current;
Feedback circuit, one end of described feedback circuit is connected electrically in the inverting input of described second amplifier module, the other end of described feedback circuit is connected electrically in the output of described second amplifier module by the first resistor, be configured to increase in the process of described maximum output current at the drive current of described load, eliminate the harmonic distortion plus noise of described first amplifier module.
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| CN201510021480.4A CN104660191B (en) | 2015-01-15 | 2015-01-15 | The circuit of driving load, method and device |
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| CN201510021480.4A CN104660191B (en) | 2015-01-15 | 2015-01-15 | The circuit of driving load, method and device |
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| CN1738141A (en) * | 2004-08-18 | 2006-02-22 | 台达电子工业股份有限公司 | Master-slave current distributing 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 |
| US20120187928A1 (en) * | 2011-01-20 | 2012-07-26 | International Rectifier Corporation | Synchronous Buck Converter Including Multi-Mode Control for Light Load Efficiency and Related Method |
| 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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| 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 distributing circuit |
| US7990126B1 (en) * | 2006-07-20 | 2011-08-02 | Marvell International, Ltd. | Low power DC-DC converter with improved load regulation |
| US20120187928A1 (en) * | 2011-01-20 | 2012-07-26 | International Rectifier Corporation | Synchronous Buck Converter Including Multi-Mode Control for Light Load Efficiency and Related Method |
| 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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