CN106992760A - D-type power amplifier and audio frequency apparatus - Google Patents
D-type power amplifier and audio frequency apparatus Download PDFInfo
- Publication number
- CN106992760A CN106992760A CN201710124115.5A CN201710124115A CN106992760A CN 106992760 A CN106992760 A CN 106992760A CN 201710124115 A CN201710124115 A CN 201710124115A CN 106992760 A CN106992760 A CN 106992760A
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- power amplifier
- inductance
- pass filter
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/52—One-way transmission networks, i.e. unilines
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of D-type power amplifier.D-type power amplifier includes waveform generator, comparator, power amplifier and low pass filter.The in-phase input end of comparator connects the output end of waveform generator.The inverting input connection input signal of comparator.The output end of comparator connects the input of power amplifier.The output end of power amplifier connects the input of low pass filter.Low pass filter is the adjustable low pass filter of cut-off frequency.Low pass filter includes the adjustable electric capacity of capacitance and/or the adjustable inductance of inductance value.Low pass filter is by adjusting the capacitance of electric capacity and/or the inductance value of inductance to adjust cut-off frequency.The D-type power amplifier of embodiment of the present invention can adjust the cut-off frequency of low pass filter to change amplitude versus frequency characte according to the demand for alt, so as to change audio.In addition, the invention also discloses a kind of audio frequency apparatus.
Description
Technical field
The present invention relates to Audiotechnica field, more particularly to a kind of D-type power amplifier and audio frequency apparatus.
Background technology
In the related art, D classes power amplifier is widely used in communication, sound due to having the advantages that simple in construction, efficiency high
The fields such as frequency.In audio, many people have different pursuits, the i.e. pursuit to audio different for the ratio of alt, if any
People most ask more for high pitch, and somebody is few.In order to meet this demand, conventional method is by increase
DSP adjusts frequency response etc. by way of software.However, the shortcoming of this method is increase cost, but also audio can be reduced
Index.
The content of the invention
Embodiment of the present invention provides a kind of D-type power amplifier and audio frequency apparatus.
The D-type power amplifier of embodiment of the present invention, including waveform generator, comparator, power amplifier and low pass filtered
Ripple device；The in-phase input end of the comparator connects the output end of the waveform generator, the inverting input of the comparator
Input signal is connected, the output end of the comparator connects the input of the power amplifier；The output end of the power amplifier
The input of the low pass filter is connected, the low pass filter is the adjustable low pass filter of cut-off frequency, the low pass
Wave filter includes the adjustable electric capacity of capacitance and/or the adjustable inductance of inductance value, and the low pass filter is by adjusting the electricity
The capacitance of appearance and/or the inductance value of the inductance are to adjust the cut-off frequency.
The audio frequency apparatus of embodiment of the present invention includes the D-type power amplifier of embodiment of the present invention.
The D-type power amplifier and audio frequency apparatus of embodiment of the present invention are entered using the adjustable low pass filter of cut-off frequency
The demodulation of row modulated signals, can adjust the cut-off frequency of low pass filter according to the demand for alt to change width
Frequency characteristic, so as to change audio.
The additional aspect and advantage of embodiment of the present invention will be set forth in part in the description, partly by from following
Become obvious in description, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention can be from description of the accompanying drawings below to embodiment be combined
It will be apparent and be readily appreciated that, wherein：
Fig. 1 is the high-level schematic functional block diagram of the D-type power amplifier of embodiment of the present invention.
Fig. 2 is the circuit diagram of the low-pass first order filter of embodiment of the present invention.
Fig. 3 is the circuit diagram of the low-pass first order filter of another embodiment of the invention.
Fig. 4 is the circuit diagram of the second-order low-pass filter of embodiment of the present invention.
Fig. 5 is the circuit diagram of the second-order low-pass filter of another embodiment of the invention.
Fig. 6 is the circuit diagram of the third-order low-pass filter of embodiment of the present invention.
Main element and symbol description：
D-type power amplifier 10, waveform generator 11, comparator 12, power amplifier 13, low pass filter 14, single order are low
Bandpass filter 142, second-order low-pass filter 144, third-order low-pass filter 146；
First resistor R1, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5,
Six electric capacity C6, the first inductance L1, the second inductance L2.
Embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein, it is identical
Or similar label represents same or similar element or the element with same or like function from beginning to end.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, is only used for explaining embodiments of the present invention, and it is not intended that to this hair
The limitation of bright embodiment.
Referring to Fig. 1, the D-type power amplifier 10 of embodiment of the present invention includes waveform generator 11, comparator 12, work(
Discharge road 13 and low pass filter 14.The in-phase input end of comparator 12 connects the output end of waveform generator 11.Comparator 12
Inverting input connection input signal.The output end of comparator 12 connects the input of power amplifier 13.Power amplifier 13
Output end connects the input of low pass filter 14.Low pass filter 14 is the adjustable low pass filter 14 of cut-off frequency.Low pass
Wave filter 14 includes the adjustable electric capacity of capacitance and/or the adjustable inductance of inductance value.Low pass filter 14 is by adjusting electric capacity
Capacitance and/or the inductance value of inductance are to adjust cut-off frequency.
The D-type power amplifier 10 of embodiment of the present invention using the adjustable low pass filter 14 of cut-off frequency adjusted
The demodulation of signal processed, it is special to change amplitude-frequency that the cut-off frequency of low pass filter 14 can be adjusted according to the demand for alt
Property, so as to change audio.
In some embodiments, waveform generator 11 is saw-toothed wave generator.
Specifically, saw-toothed wave generator can produce sawtooth periodically.Input signal is produced with saw-toothed wave generator
Sawtooth be compared by comparator 12, then carry out PWM, output pulse width modulated signal, power amplifier 13
The signal of modulation is amplified, and low pass filter 14 demodulates the signal modulated to come.Thus, low pass filter 14
Amplitude versus frequency characte affects the audio of D-type power amplifier 10.
Referring to Fig. 2, in some embodiments, low pass filter 14 includes low-pass first order filter 142.
Specifically, the circuit that low-pass first order filter 142 can constitute for RC elements.In this way, circuit structure is simple.
In some embodiments, low-pass first order filter 142 includes first resistor R1 and the first electric capacity C1.First resistor
R1 one end connects the output end of power amplifier 13.The first resistor R1 other end connects the first electric capacity C1 one end.First electricity
Hold C1 other end ground connection.First electric capacity C1 is the adjustable electric capacity of capacitance.Low-pass first order filter 142 passes through the electricity of regulation first
Hold C1 capacitance to adjust cut-off frequency.
Specifically, in embodiments of the present invention, first resistor R1 one end as low-pass first order filter 142 input
End, the first resistor R1 other end as low-pass first order filter 142 output end.
By the calculation formula of cut-off frequencyUnderstand, in one example, as resistance R=1 Ω, electric capacity C=159
During μ F, cut-off frequency f=1KHZ；As resistance R=0.1 Ω, electric capacity C=1590 μ F, cut-off frequency f=1KHZ.
Thus, first resistor R1 and the first electric capacity C1 value determine the size of cut-off frequency.It is appreciated that the first electricity
Resistance R1 should choose less resistance value, to avoid the voltage loss on first resistor R1.
When the capacitance for adjusting the first electric capacity C1 make it that the first electric capacity C1 capacitance increases, low-pass first order filter
142 cut-off frequency reduces, and the HFS that can pass through in circuit is less, and vice versa.
In this way, it is special to change amplitude-frequency that the cut-off frequency of low pass filter 14 can be adjusted according to the demand to alt
Property, so as to change audio.
Wherein, the adjustable electric capacity of capacitance can be trimmer or tunable capacitor.The capacitance of trimmer can be at certain
One a small range is adjusted, and can be fixed on some capacitance after the adjustment.The capacity variable range of trimmer is smaller, generally only
There are several pico farads to tens pico farads.And the capacitance of tunable capacitor can relatively be adjusted in somewhat larger scope, and it can adjust
Some capacitance is fixed on after whole.Therefore, when by adjusting the capacitance of trimmer to adjust cut-off frequency, cut-off frequency
Alterable scope it is smaller, in other words, the adjustment of school slightly can be entered to audio.
It is pointed out that the explanation herein for the adjustable electric capacity of capacitance is equally applicable to following embodiment party
Formula.
Referring to Fig. 3, in some embodiments, low-pass first order filter 142 also includes in parallel with the first electric capacity C1
Second electric capacity C2.Second electric capacity C2 is the electric capacity or the adjustable electric capacity of capacitance that capacitance is fixed.
In this way, the first electric capacity C1 and the second electric capacity C2 collocation, which is used, can preferably adjust low-pass first order filter 142
Cut-off frequency.
Certainly, in other embodiments, low-pass first order filter 142 can also be made up of other elements or circuit.
Referring to Fig. 4, in some embodiments, low pass filter 14 includes second-order low-pass filter 144.
Specifically, the circuit that second-order low-pass filter 144 can constitute for LC elements.In this way, filter effect is preferably, and into
This is relatively low.
In some embodiments, second-order low-pass filter 144 includes the first inductance L1 and the 3rd electric capacity C3.First inductance
L1 one end connects the output end of power amplifier 13.The first inductance L1 other end connects the 3rd electric capacity C3 one end.3rd electricity
Hold C3 other end ground connection.3rd electric capacity C3 is the adjustable electric capacity of capacitance.First inductance L1 is the adjustable inductance of inductance value.Two
Rank low pass filter 144 is by adjusting the 3rd electric capacity C3 capacitance and/or the first inductance L1 inductance value to adjust cutoff frequency
Rate.
Specifically, in embodiments of the present invention, the first inductance L1 one end as second-order low-pass filter 144 input
End, the first inductance L1 other end as second-order low-pass filter 144 output end.
By the calculation formula of cut-off frequencyUnderstand, in one example, as inductance L=10 μ H,
During electric capacity C=0.5 μ F, cut-off frequency f=100KHZ；As inductance L=1 μ H, electric capacity C=5 μ F, cut-off frequency f=100KHZ.
Thus, the first inductance L1 and the 3rd electric capacity C3 value determine the size of cut-off frequency.
When the 3rd electric capacity C3 capacitance and/or the first inductance L1 inductance value increase, second-order low-pass filter 144
Cut-off frequency reduces, and the HFS that can pass through in circuit is less, and vice versa.
In this way, it is special to change amplitude-frequency that the cut-off frequency of low pass filter 14 can be adjusted according to the demand to alt
Property, so as to change audio.
Wherein, the adjustable inductance of inductance value can be controllable impedance.Controllable impedance can be by changing iron core in coil
Position or coil turn changed using slide switch adjust inductance value.
It is pointed out that the explanation herein for the adjustable inductance of inductance value is equally applicable to following embodiment party
Formula.
Referring to Fig. 5, in some embodiments, second-order low-pass filter 144 also includes in parallel with the 3rd electric capacity C3
4th electric capacity C4.4th electric capacity C4 is the electric capacity or the adjustable electric capacity of capacitance that capacitance is fixed.
In this way, the first inductance L1, the 3rd electric capacity C3 and the 4th electric capacity C4 collocation, which are used, can preferably adjust step low-pass
The cut-off frequency of wave filter 144.
Certainly, in other embodiments, second-order low-pass filter 144 can also be made up of other elements or circuit.
Referring to Fig. 6, in some embodiments, low pass filter 14 includes third-order low-pass filter 146.
Specifically, the circuit that third-order low-pass filter 146 can constitute for LC elements.In this way, filter effect is preferably, and it is high
It is rapid in the signal section decay of cut-off frequency.
In some embodiments, third-order low-pass filter 146 includes the second inductance L2, the 5th electric capacity C5 and the 6th electric capacity
C6.The output end of second inductance L2 one end connection power amplifier 13 and the 6th electric capacity C6 one end.Second inductance L2's is another
The 5th electric capacity C5 of end connection one end.5th electric capacity C5 other end ground connection.6th electric capacity C6 other end ground connection.5th electric capacity
C5 is the adjustable electric capacity of capacitance.Second inductance L2 is the adjustable inductance of inductance value.Third-order low-pass filter 146 passes through regulation the
Five electric capacity C5 capacitance and/or the second inductance L2 inductance value are to adjust cut-off frequency.
Specifically, in embodiments of the present invention, the second inductance L2 one end as third-order low-pass filter 146 input
End, the second inductance L2 other end as third-order low-pass filter 146 output end.
Similarly, when the 5th electric capacity C5 capacitance and/or the second inductance L2 inductance value increase, third-order low-pass filter
146 cut-off frequency reduces, and the HFS that can pass through in circuit is less, and vice versa.
In this way, it is special to change amplitude-frequency that the cut-off frequency of low pass filter 14 can be adjusted according to the demand to alt
Property, so as to change audio.
In some embodiments, the 6th electric capacity C6 can be the adjustable electric capacity of capacitance.In this way, the 5th electric capacity C5, the 6th
Electric capacity C6 and the second inductance L2 collocation, which is used, can preferably adjust the cut-off frequency of third-order low-pass filter 146.
Certainly, in other embodiments, third-order low-pass filter 146 can also be made up of other elements or circuit.
The audio frequency apparatus of embodiment of the present invention includes the D-type power amplifier 10 of any of the above-described embodiment.
The audio frequency apparatus of embodiment of the present invention carries out modulated signals using the adjustable low pass filter 14 of cut-off frequency
Demodulation, the cut-off frequency of low pass filter 14 can be adjusted according to the demand for alt to change amplitude versus frequency characte, from
And change audio.
Specifically, audio frequency apparatus can with but be not limited to power amplifier, audio amplifier, multimedia console, digital sound console, audio
The audio frequency apparatuses such as sampling card, synthesizer, medium-high frequency audio amplifier, microphone, the sound card in PC, earphone, DVD playback equipments.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more feature.In the description of embodiments of the present invention, " multiple " are meant that two
Individual or two or more, unless otherwise specifically defined.
, it is necessary to illustrate in the description of embodiments of the present invention, unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one
Connect body；It can be mechanical connection or electrical connection or can mutually communicate；Can be joined directly together, can also lead to
Cross intermediary to be indirectly connected to, can be connection or the interaction relationship of two elements of two element internals.For ability
For the those of ordinary skill in domain, it can understand that above-mentioned term in embodiments of the present invention specific contains as the case may be
Justice.
Above disclosure provides many different embodiments or example is used for realizing embodiments of the present invention not
Same structure.In order to simplify the disclosure of embodiments of the present invention, above the part and setting of specific examples are described.When
So, they are only merely illustrative, and purpose does not lie in the limitation present invention.In addition, embodiments of the present invention can be in different examples
Repeat reference numerals and/or reference letter in son, this repetition are for purposes of simplicity and clarity, itself not indicate to be begged for
By the relation between various embodiments and/or setting.In addition, the various specific techniques that embodiments of the present invention are provided
With the example of material, but those of ordinary skill in the art can be appreciated that the application of other techniques and/or making for other materials
With.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", " specific example " or " some examples " etc. means the tool with reference to the embodiment or example description
Body characteristicses, structure, material or feature are contained at least one embodiment of the present invention or example.In this manual,
Identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, the specific features of description, knot
Structure, material or feature can in an appropriate manner be combined in any one or more embodiments or example.
Any process described otherwise above or method description are construed as in flow chart or herein, represent to include
Module, fragment or the portion of the code of one or more executable instructions for the step of realizing specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by shown or discussion suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processing module or other can be from instruction
The system of execution system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or
Equipment and use.For the purpose of this specification, " computer-readable medium " can be it is any can include, store, communicating, propagating or
Transmission procedure uses for instruction execution system, device or equipment or with reference to these instruction execution systems, device or equipment
Device.The more specifically example (non-exhaustive list) of computer-readable medium includes following：With one or more wirings
Electrical connection section (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of embodiments of the present invention can be with hardware, software, firmware or combinations thereof come real
It is existing.In the above-described embodiment, multiple steps or method can be with storages in memory and by suitable instruction execution system
The software or firmware of execution is realized.If for example, being realized with hardware, with another embodiment, ability can be used
Any one of following technology known to domain or their combination are realized：With for realizing logic function to data-signal
The discrete logic of logic gates, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array
(PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
Rapid to can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in various embodiments of the present invention can be integrated in a processing module, also may be used
To be that unit is individually physically present, can also two or more units be integrated in a module.It is above-mentioned integrated
Module can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module
If being realized using in the form of software function module and as independent production marketing or in use, a calculating can also be stored in
In machine read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (11)
1. a kind of D-type power amplifier, it is characterised in that including waveform generator, comparator, power amplifier and LPF
Device；The in-phase input end of the comparator connects the output end of the waveform generator, and the inverting input of the comparator connects
Input signal is connect, the output end of the comparator connects the input of the power amplifier；The output end of the power amplifier connects
The input of the low pass filter is connect, the low pass filter is the adjustable low pass filter of cut-off frequency, the low pass filtered
Ripple device includes the adjustable electric capacity of capacitance and/or the adjustable inductance of inductance value, and the low pass filter is by adjusting the electric capacity
Capacitance and/or the inductance inductance value to adjust the cut-off frequency.
2. D-type power amplifier as claimed in claim 1, it is characterised in that the low pass filter includes first-order low-pass
Ripple device.
3. D-type power amplifier as claimed in claim 2, it is characterised in that the low-pass first order filter includes the first electricity
Resistance and the first electric capacity；One end of the first resistor connects the output end of the power amplifier, the other end of the first resistor
Connect one end of first electric capacity；The other end ground connection of first electric capacity；First electric capacity is the adjustable electricity of capacitance
Hold, the low-pass first order filter is by adjusting the capacitance of first electric capacity to adjust the cut-off frequency.
4. D-type power amplifier as claimed in claim 3, it is characterised in that the low-pass first order filter also includes and institute
The first electric capacity the second electric capacity in parallel is stated, second electric capacity is the electric capacity or the adjustable electric capacity of capacitance that capacitance is fixed.
5. D-type power amplifier as claimed in claim 1, it is characterised in that the low pass filter is filtered including step low-pass
Ripple device.
6. D-type power amplifier as claimed in claim 5, it is characterised in that the second-order low-pass filter includes the first electricity
Sense and the 3rd electric capacity；One end of first inductance connects the output end of the power amplifier, the other end of first inductance
Connect one end of the 3rd electric capacity；The other end ground connection of 3rd electric capacity；3rd electric capacity is the adjustable electricity of capacitance
Hold, first inductance is the adjustable inductance of inductance value, and the second-order low-pass filter is by adjusting the electricity of the 3rd electric capacity
Capacitance and/or the inductance value of first inductance are to adjust the cut-off frequency.
7. D-type power amplifier as claimed in claim 6, it is characterised in that the second-order low-pass filter also includes and institute
The 3rd electric capacity the 4th electric capacity in parallel is stated, the 4th electric capacity is the electric capacity or the adjustable electric capacity of capacitance that capacitance is fixed.
8. D-type power amplifier as claimed in claim 1, it is characterised in that the low pass filter is filtered including third-order low-pass
Ripple device.
9. D-type power amplifier as claimed in claim 8, it is characterised in that the third-order low-pass filter includes the second electricity
Sense, the 5th electric capacity and the 6th electric capacity；One end of second inductance connects the output end and the 6th electricity of the power amplifier
One end of appearance, the other end of second inductance connects one end of the 5th electric capacity；The other end ground connection of 5th electric capacity；
The other end ground connection of 6th electric capacity；5th electric capacity is the adjustable electric capacity of capacitance, and second inductance is inductance value
Adjustable inductance, the third-order low-pass filter is by adjusting the capacitance and/or second inductance of the 5th electric capacity
Inductance value is to adjust the cut-off frequency.
10. D-type power amplifier as claimed in claim 1, it is characterised in that the waveform generator is sawtooth waveforms
Device.
11. a kind of audio frequency apparatus, it is characterised in that including the D-type power amplifier as described in claim 1-10 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124115.5A CN106992760A (en) | 2017-03-03 | 2017-03-03 | D-type power amplifier and audio frequency apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124115.5A CN106992760A (en) | 2017-03-03 | 2017-03-03 | D-type power amplifier and audio frequency apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106992760A true CN106992760A (en) | 2017-07-28 |
Family
ID=59411638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710124115.5A Pending CN106992760A (en) | 2017-03-03 | 2017-03-03 | D-type power amplifier and audio frequency apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106992760A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992756A (en) * | 2017-03-03 | 2017-07-28 | 广东欧珀移动通信有限公司 | D-type power amplifier and audio frequency apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1716762A (en) * | 2004-06-29 | 2006-01-04 | 印芬龙科技股份有限公司 | Class D-amplifier |
| CN202444468U (en) * | 2012-02-27 | 2012-09-19 | 无锡华润矽科微电子有限公司 | Self-adaption D type audio power amplifying circuit structure |
| CN102983825A (en) * | 2012-11-16 | 2013-03-20 | 上海贝岭股份有限公司 | Category D amplifier chip |
| CN205725668U (en) * | 2016-04-07 | 2016-11-23 | 武汉大学 | Numeral amplitude-frequency balancing powder amplifier |
-
2017
- 2017-03-03 CN CN201710124115.5A patent/CN106992760A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1716762A (en) * | 2004-06-29 | 2006-01-04 | 印芬龙科技股份有限公司 | Class D-amplifier |
| CN202444468U (en) * | 2012-02-27 | 2012-09-19 | 无锡华润矽科微电子有限公司 | Self-adaption D type audio power amplifying circuit structure |
| CN102983825A (en) * | 2012-11-16 | 2013-03-20 | 上海贝岭股份有限公司 | Category D amplifier chip |
| CN205725668U (en) * | 2016-04-07 | 2016-11-23 | 武汉大学 | Numeral amplitude-frequency balancing powder amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992756A (en) * | 2017-03-03 | 2017-07-28 | 广东欧珀移动通信有限公司 | D-type power amplifier and audio frequency apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE102008044147B4 (en) | Receiving comparator for signal modulation on supply line | |
| CN105827321B (en) | Non-linear compensation method, device and system in multi-carrier light communication system | |
| CN106878864A (en) | Power circuit and audio frequency apparatus | |
| CN206387846U (en) | A kind of wide-band capacitor compensating formula resitstance voltage divider | |
| CN107306079A (en) | filtering method, system and device | |
| CN106992760A (en) | D-type power amplifier and audio frequency apparatus | |
| DE2815671A1 (en) | TUNED BANDPASS FILTER AND SIGNAL PROCESSOR CONTAINING THE TUNED BANDPASS FILTER | |
| CN106559062B (en) | Logic analyser threshold voltage adjustment circuit | |
| CN103716737A (en) | Volume adjusting circuit and method | |
| CN106992756A (en) | D-type power amplifier and audio frequency apparatus | |
| CN1969538A (en) | Video signal output circuit, and electronic device using the circuit | |
| Karris | Circuit Analysis II: With MATLAB Applications | |
| CN103259500A (en) | Tracking filter circuit | |
| CN106954028A (en) | A kind of auto iris drive circuit and electronic installation | |
| CN102420664A (en) | Simulation system of noise signal for carrier test of low-voltage power line | |
| DE102012218589B4 (en) | Charging device for charging the energy store of a portable electrical device | |
| CN202435412U (en) | Noise signal imitation system for low-voltage power line carrier test | |
| DE202014104676U1 (en) | Buzzer driver electronics | |
| CN109951176A (en) | A kind of system and method for the acquisition capacity for detection waveform acquisition device | |
| CN202818477U (en) | Equalizer applicable to cable television amplifier | |
| DE202019102390U1 (en) | Switching cell arrangement for reducing the radio interference voltage spectrum of an electronic commutation device | |
| CN204304948U (en) | A kind of high-pass filter | |
| CN104201996A (en) | Feedback circuit for D type power amplifier and electronic equipment | |
| CN108540905A (en) | Divider circuit and frequency divider | |
| CN219066131U (en) | Switching circuit and switching wire for USB-C digital audio interface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170728 |