CN205622841U - Audio output circuit - Google Patents
Audio output circuit Download PDFInfo
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- CN205622841U CN205622841U CN201620325459.3U CN201620325459U CN205622841U CN 205622841 U CN205622841 U CN 205622841U CN 201620325459 U CN201620325459 U CN 201620325459U CN 205622841 U CN205622841 U CN 205622841U
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Abstract
The utility model provides an audio output circuit, it includes: digital analog converter, it is used for converting the data signal who treats the broadcast into treat the broadcast analog signal, shaping circuit, it is used for the analog signal who treats the broadcast to carry out the plastic to analog signal after the output plastic, analog signal after the adder, its first addend input and plastic links to each other, its second addend input with refer to the DC voltage and link to each other its output reference voltage, the direct current the direct current transducer, it is through malleation direct current voltage regulation to the magnitude of voltage that equal reference voltage of negative feedback with its output, the negative electrical charge pump, its input links to each other with the malleation DC voltage, its output negative pressure DC voltage, AB class amplifier, its positive supply end links to each other with the malleation DC voltage, and its negative supply end links to each other with the negative pressure DC voltage, and its input links to each other with the analog signal who treats the broadcast, and its output links to each other with the load. Compared with the prior art, the utility model discloses can further improve work efficiency.
Description
[technical field]
This utility model relates to audio frequency export technique field, particularly to a kind of novel audio output circuit.
[background technology]
Prior art typically realizes senior audio driven function by G class (class G) amplifier,
As it is shown in figure 1, the circuit diagram that it is a kind of G class A amplifier A of the prior art, this G class A amplifier A
Including: positive charge pump (Positive Charge Pump) 110, negative charge pump (Negative Charge Pump)
120, class ab ammplifier (Class AB) 130, load load.G class A amplifier A shown in Fig. 1 and tradition
Class ab ammplifier compare, there are two clear advantages: the first, the G class A amplifier A shown in Fig. 1 leads to
Cross positive charge pump 110 provide positive supply and negative charge pump 120 provide negative supply, it is possible to achieve without every
Straight electric capacity can directly drive load (such as earphone), because now zero-signal is positioned at ground level (i.e. 0 electricity
Flat), and the zero-signal of tradition class ab ammplifier is normally at (1/2) supply voltage again, if traditional
Class ab ammplifier does not connect capacitance and directly drives earphone load, then can produce DC current, consumes extra power
Consumption；The second, when the output signal amplitude of oscillation is less, can be by changing in the G class A amplifier A shown in Fig. 1
The multiplying power of positive charge pump 110 and negative charge pump 120 improves efficiency, i.e. saves electric energy.
For above-mentioned first point, needing zero-signal output to be positioned at ground level why, its reason is, so may be used
With will not consumed DC current when without capacitance, it is to avoid the extra power consumption that DC current produces；For
Above-mentioned second point, when exporting audio signal and being less, can allow the positive charge of the G class A amplifier A shown in Fig. 1
Pump 110 is operated in (1/2) times supply voltage pattern, allows negative charge pump 120 be operated in (-1/2) times power supply electricity
Die pressing type, the power consumption that the class ab ammplifier 130 being so followed by consumes is less, efficiency is higher, can be with power saving.
Class ab ammplifier is linear circuit, similar with linear voltage regulator, and the difference of its supply voltage and output voltage will be
Consuming bigger power consumption on amplifier, this voltage difference is the power consumption of consumption, this power consumption with the product exporting electric current
It is wasted, reduces this voltage difference and be favorably improved efficiency.
Further, since positive charge pump 110 and negative charge pump 120 are fixed multiplying power, its effect that can improve
Rate is limited, such as, if output voltage is more than (1/2) times supply voltage VIN, in order to allow AB class put
Big device 130 can export enough output voltages, and positive charge pump 110 and negative charge pump 120 can only be allowed the most defeated
Go out the supply voltage of 1 times, the most inefficent raising.
Thus, it is necessary to propose a kind of new technical scheme to solve the problems referred to above.
[utility model content]
The purpose of this utility model is to provide a kind of novel audio output circuit, and it can improve sound further
Frequently the work efficiency of output circuit.
In order to solve the problems referred to above, this utility model provides a kind of audio output circuit, and it includes digital-to-analogue conversion
Device, shaping circuit, adder, DC-to-DC converter, negative charge pump and class ab ammplifier.Described number
Weighted-voltage D/A converter includes input and outfan, and its input is connected with digital signal to be played, described digital-to-analogue
Transducer for being converted to analogue signal to be played by described digital signal to be played, and is exported by it
End exports described analogue signal to be played；Described shaping circuit includes input and outfan, described shaping
The input of circuit is connected with the outfan of described digital to analog converter, and described shaping circuit is for described digital-to-analogue
The analogue signal to be played of transducer output carries out shaping, and by the simulation after its outfan output Shaping
Signal；
First addend input of described adder is connected with the analogue signal after described shaping, and its second addend inputs
Holding and be connected with reference to DC voltage with one, its outfan output reference voltage, described reference voltage is equal to
VO+V1, wherein, VO is the magnitude of voltage of the analogue signal after described shaping, and V1 is described with reference to unidirectional current
The magnitude of voltage of pressure；The power end of described DC-to-DC converter is connected with voltage source, its reference voltage terminal and institute
Stating reference voltage to be connected, described DC-to-DC converter is for carrying out DC-to-dc to the voltage of described voltage source
Conversion, and export malleation DC voltage by its outfan, and described DC-to-DC converter is according to benchmark electricity
Press the malleation direct current Voltage Cortrol output it by negative feedback to the magnitude of voltage equal to described reference voltage；Institute
The input stating negative charge pump is connected with described malleation DC voltage, and described negative charge pump is for described malleation
DC voltage VP carries out negative pressure conversion, the negative pressure DC voltage of its outfan output malleation direct current equal to-1 times
Voltage；The positive power source terminal of described class ab ammplifier is connected with malleation DC voltage, and its negative power end is negative with described
Pressure DC voltage is connected, and its input is connected with described analogue signal to be played, and its outfan is negative with described
Carrying and be connected, described class ab ammplifier is used for malleation DC voltage as positive supply, is negative with negative pressure DC voltage
Power work, produces output voltage with analogue signal to be played for input voltage and drives load.
Further, described shaping circuit described analogue signal VA to be played magnitude of voltage more than 0 time,
Analogue signal VO after the shaping of its output is equal to analogue signal VA to be played；Described shaping circuit is in institute
Analogue signal VO etc. when stating the magnitude of voltage of analogue signal VA to be played less than 0, after the shaping of its output
In analogue signal VA to be played of-1 times.
Further, described shaping circuit includes control unit, the first switch, second switch and subtractor,
Described first switch one connection end be connected with the input of described shaping circuit, its another connection end with described
The outfan of shaping circuit is connected；The minuend input of described subtractor and 0 level are connected, and its subtrahend is defeated
Enter end to be connected with the input of described shaping circuit, its outfan output difference signal, and this difference signal etc.
In 0-VA, wherein, VA is the magnitude of voltage of analogue signal to be played, and 0 is 0 level；Second switch
One connects end is connected with the outfan of described subtractor, its another connect the outfan of end and described shaping circuit
It is connected；The input of described control unit is connected with the input of described shaping circuit, described control circuit
First outfan is connected with the control end of described first switch, and the second outfan of described control circuit is with described
The control end of second switch is connected, when the magnitude of voltage of described analogue signal to be played is more than 0, and described control
Unit processed controls the first switch conduction and controls second switch shutoff；Electricity when described analogue signal to be played
When pressure value is less than 0, described control unit controls the first switch OFF and controls second switch conducting.
Further, described control unit includes comparator and phase inverter, the normal phase input end of described comparator
As the input of described control unit, its anti-phase input terminates 0 level, its outfan and described phase inverter
Input be connected, the outfan of phase inverter is as the second outfan of described control unit, described comparator
Outfan and the input of phase inverter between connect node as the first outfan of described control unit.
Further, described is 100mV～200mV with reference to DC voltage.
Further, the output voltage that described class ab ammplifier produces is differential output voltage, and described load is
Earphone.
Compared with prior art, this utility model provides a kind of novel audio output circuit, and it is based on to be played
Audio signal pressure drop design electricity fixing equal to that the class ab ammplifier in this audio output circuit is consumed
Pressure, owing to the magnitude of voltage of this fixed voltage is less, therefore its power consumption consumed is less than in tradition G class A amplifier A
The power consumption that class ab ammplifier consumes, thus improve the work efficiency of audio output circuit further.
[accompanying drawing explanation]
In order to be illustrated more clearly that the technical scheme of this utility model embodiment, in embodiment being described below
The required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this reality
By some novel embodiments, for those of ordinary skill in the art, do not paying creative work
On the premise of, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.Wherein:
Fig. 1 is the circuit diagram of a kind of G class A amplifier A of the prior art；
Fig. 2 is the circuit diagram of this utility model novel audio output circuit in one embodiment；
Fig. 3 is the circuit diagram in one embodiment of the shaping circuit SR in Fig. 2；
Fig. 4 (A) is analogue signal VA to be played and the output of the shaping circuit SR input shown in Fig. 3
Shaping after analogue signal VO oscillogram in one embodiment；
Fig. 4 (B) is analogue signal VA to be played in Fig. 2, reference voltage V R, malleation DC voltage
VP and negative pressure DC voltage VN oscillogram in one embodiment.
[detailed description of the invention]
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with attached
This utility model is described in further detail by figure and detailed description of the invention.
" embodiment " or " embodiment " referred to herein refers to may be included in this utility model, and at least one is real
Special characteristic, structure or characteristic in existing mode.Different local in this manual occur " an enforcement
In example " not refer both to same embodiment, it is not single or the most mutually exclusive with other embodiments
Embodiment.Unless stated otherwise, connection herein, be connected, connect represent that the word being electrically connected with is equal
Represent and be directly or indirectly electrical connected.
Refer to shown in Fig. 2, it is this utility model novel audio output circuit in one embodiment
Circuit diagram.Audio output circuit shown in Fig. 2 includes: digital to analog converter DAC, shaping circuit SR,
Adder 210, DC-to-DC converter 220, negative charge pump 230, class ab ammplifier 240 and load Load.
Described digital to analog converter DAC includes input and outfan, its input and digital signal to be played
DS is connected, and described digital to analog converter DAC is for being converted to wait to broadcast by described digital signal DS to be played
Analogue signal VA put, and export described analogue signal VA to be played by its outfan.
Described shaping circuit SR includes input and outfan, and the input of described shaping circuit SR is with described
The outfan of digital to analog converter DAC is connected, and described shaping circuit SR is for described digital to analog converter DAC
Analogue signal VA to be played of output carries out shaping, and is believed by the simulation after its outfan output Shaping
Number VO.Concrete, when the magnitude of voltage of described analogue signal VA to be played is more than 0 (i.e. 0 level),
Analogue signal VO after shaping is equal to analogue signal VA to be played；When described analogue signal to be played
When the magnitude of voltage of VA is less than 0, the analogue signal to be played equal to-1 times of analogue signal VO after shaping
VA。
After the shaping that first addend input of described adder 210 and described shaping circuit SR outfan export
Analogue signal VO be connected, its second addend input and one are connected with reference to DC voltage V1, described in add
The outfan output reference voltage VR of musical instruments used in a Buddhist or Taoist mass 210, and VR=VO+V1, wherein, voltage on the basis of VR
The magnitude of voltage of VR, VO is the magnitude of voltage of analogue signal VO after the shaping of described shaping circuit SR output,
V1 is the described magnitude of voltage with reference to DC voltage V1.
The power end of described DC-to-DC converter 220 is connected with voltage source VIN (or supply voltage VIN),
Reference voltage V R that its reference voltage terminal exports with described adder 210 outfan is connected, described direct current-straight
Stream transformer 220 for carrying out DC-to-dc conversion to the voltage of described voltage source VIN, and is exported by it
End exports malleation DC voltage VP, and described DC-to-DC converter 220 is passed through negative according to reference voltage V R
The malleation DC voltage VP that feedback outputs it adjusts to the magnitude of voltage equal to described reference voltage V R.
The malleation that the input of described negative charge pump 230 exports with described DC-to-DC converter 220 outfan
DC voltage VP is connected, and described negative charge pump 230 turns for described malleation DC voltage VP is carried out negative pressure
Change, the negative pressure DC voltage VN of its outfan output malleation DC voltage VP equal to-1 times.
The positive power source terminal of described class ab ammplifier 240 is connected with malleation DC voltage VP, its negative power end with
Described negative pressure DC voltage VN is connected, and its input is connected with described analogue signal VA to be played, and it is defeated
Going out end to be connected with described load Load, described class ab ammplifier 240 is with malleation DC voltage VP as positive electricity
Source, works with negative pressure DC voltage VN for negative supply, and produces with analogue signal VA to be played for input voltage
Raw differential output voltage drives load Load (such as, earphone).
Refer to shown in Fig. 3, it is the circuit diagram in one embodiment of the shaping circuit SR in Fig. 2,
Shaping circuit SR shown in Fig. 3 includes that control unit 310, first switchs S1, second switch S2 and subtraction
Device 320.
The one connection end of described first switch S1 is connected with the input VA of described shaping circuit SR, and it is another
One connects end is connected with the outfan VO of described shaping circuit SR；The minuend input of described subtractor 320
End is connected with 0 level, and its subtracting input is connected with the input VA of described shaping circuit SR, its output
End output difference signal V2, and V2=0-VA, wherein, V2 is the magnitude of voltage of difference signal, and VA is for treating
The magnitude of voltage of analogue signal VA play, 0 is 0 level；The one connection end of second switch S2 subtracts with described
The outfan of musical instruments used in a Buddhist or Taoist mass 320 is connected, and its another connection end is connected with the outfan VO of described shaping circuit SR,
The outfan output difference signal V2 of described subtractor 320, and V2=0-VA, wherein, V2 is difference letter
Number magnitude of voltage, VA is the magnitude of voltage of analogue signal VA to be played, and 0 is 0 level.
The input of described control unit 310 is connected with the input VA of described shaping circuit SR, described control
First outfan of circuit 310 processed is connected with the control end of described first switch S1, described control circuit 310
The second outfan be connected with the control end of described second switch S2.When described analogue signal VA to be played
Magnitude of voltage more than 0 time, described control unit 310 control first switch S1 conducting and control second switch S2
Turn off；When the magnitude of voltage of described analogue signal VA to be played is less than 0, described control unit 310 is controlled
System the first switch S1 turns off and controls second switch S2 conducting.
In the embodiment shown in fig. 3, described control unit 310 includes comparator Comp and phase inverter
INV1, the normal phase input end of described comparator Comp is as the input of described control unit 310, and it is anti-
0 level of input termination mutually, its outfan is connected with the input of described phase inverter INV1, phase inverter INV1
Outfan as the second outfan of described control unit 310, the outfan of described comparator Comp and
Connection node between the input of phase inverter INV1 is as the first outfan of described control unit 310.When
When the magnitude of voltage of analogue signal VA to be played is more than 0, the outfan output high level of comparator Comp is (i.e.
First outfan output high level of control unit 310), control the first switch S1 conducting, this high level is believed
Low level (i.e. the second outfan output low level of control unit 310) is become after number inverted device INV1,
Control second switch S2 to turn off, analogue signal VO etc. after the shaping of the most described shaping circuit SR output
In analogue signal VA to be played；When the magnitude of voltage of analogue signal VA to be played is less than 0, comparator
The outfan output low level of Comp, controls the first switch S1 and turns off, this low level signal inverted device INV1
After become high level, control second switch S2 conducting, after the shaping of the most described shaping circuit SR output
Analogue signal VO is equal to 0-VA, and wherein, VA is the magnitude of voltage of analogue signal VA to be played.
Refer to shown in Fig. 4 (A), which respectively show the input of the shaping circuit SR shown in Fig. 3 wait broadcast
Analogue signal VO after analogue signal VA put and the shaping of output oscillogram in one embodiment, its
In, the horizontal linear in Fig. 4 (A) represents 0 level.Signal VA waveform and signal VO in Fig. 4 (A)
The relation of waveform is: when the magnitude of voltage of described analogue signal VA to be played is more than 0, the mould after shaping
Intend signal VO equal to described analogue signal VA to be played；Electricity when described analogue signal VA to be played
When pressure value is less than 0, analogue signal VO after shaping is equal to 0-VA (the i.e. VO simulation letter equal to-1 times
Number VA).
Refer to, shown in Fig. 4 (B), which respectively show analogue signal VA to be played in Fig. 2, base
Quasi-voltage VR, malleation DC voltage VP and negative pressure DC voltage VN oscillogram in one embodiment,
Wherein, the horizontal linear in Fig. 4 (B) represents 0 level.In Fig. 4 (B) signal VA, VR, VP and
The relation of VN is: combining Fig. 4 (A) and Fig. 4 (B) and understand, reference voltage V R waveform is after shaping
Analogue signal VO on superposition one with reference to DC voltage V1, this reference DC voltage V1 is fixed voltage,
Analogue signal VO after shaping will translate up the amount of the magnitude of voltage with reference to DC voltage V1；Malleation direct current
Voltage VP is equal to reference voltage V R；Negative pressure DC voltage VN is-1 times of malleation DC voltage VP, i.e.
Negative pressure DC voltage VN and malleation DC voltage VP is mirror image relationship relative to 0 level.
For the ease of understanding this utility model, specifically introduce the audio frequency shown in Fig. 2 below based on Fig. 4 (B) defeated
Go out the operation principle of circuit.
When analogue signal VA to be played is more than 0, just exporting mainly by DC-to-DC converter 220
Pressure DC voltage VP powers, and malleation DC voltage VP is multiplied by with the voltage difference of analogue signal VA to be played
Load current (i.e. the electric current flow through on load Load), then be the merit consumed on class ab ammplifier 240
Consumption, in this utility model, malleation DC voltage VP is set with the voltage difference of analogue signal VA to be played
For
Equal to the magnitude of voltage with reference to DC voltage V1, in Fig. 4 (B) for convenience between aid VP and VA
Voltage difference, that this voltage difference is drawn is relatively big, and in reality, the voltage difference between signal VP and VA (is i.e. joined
Examine DC voltage V1) can design relatively small, such as, with reference to DC voltage V1 be
100mV～200mV；When analogue signal VA to be played is less than 0, export mainly by negative charge pump 230
Negative pressure DC voltage VN power, the voltage difference of negative pressure DC voltage VN and analogue signal VA to be played
Being multiplied by load current, be then the power consumption consumed on class ab ammplifier 240, in this utility model, negative pressure is straight
Stream voltage VN is set equal to reference to DC voltage V1's with the voltage difference of analogue signal VA to be played
Magnitude of voltage.
And G class A amplifier A as shown in Figure 1 in prior art, if supply voltage VIN is 3.3V, when treating
When analogue signal VA play is 1.8V, its voltage difference consumed on class ab ammplifier 130 is
3.3V-1.8V=1.5V, then the power consumed on class ab ammplifier 130 is that 1.5V is multiplied by load current,
It is multiplied by the power consumption number of load current more than 0.1V in this utility model；If supply voltage VIN is 3.3V,
When analogue signal VA to be played is 1.5V, the positive charge pump of the G class A amplifier A shown in Fig. 1 can be allowed
110 are operated in (1/2) times supply voltage pattern, allow negative charge pump 120 be operated in (-1/2) times supply voltage
Pattern, the supply voltage of generation is (1/2) .VIN=1.65V, and it consumes on class ab ammplifier 130
Voltage difference is 1.65V-1.5V=0.15V, then the power consumed on class ab ammplifier 130 is that 0.15V takes advantage of
With load current, it is multiplied by the power consumption number of load current still greater than the 0.1V in this utility model,
In sum, the audio output circuit in this utility model includes digital to analog converter DAC, shaping circuit
SR, adder 210, DC-to-DC converter 220, negative charge pump 230, class ab ammplifier 240 and negative
Carry Load.
Wherein, digital to analog converter DAC produces analogue signal VA to be played according to digital signal DS to be played,
Analogue signal VA to be played produces analogue signal VO after shaping after shaping circuit SR shaping, whole
Analogue signal VO and a reference DC voltage V1 after shape are added, generation reference voltage V R, and direct current-
The malleation DC voltage VP that direct current transducer 220 is output it by negative feedback according to reference voltage V R adjusts
To equal to reference voltage V R, negative charge pump 230, according to malleation DC voltage VP, produces negative pressure with-1 multiplying power
DC voltage VN, class ab ammplifier 240 is with voltage VP as positive supply, with voltage VN for negative supply work
Make, and drive load Load (example with analogue signal VA to be played for input generation differential output voltage
As, earphone) so that the pressure drop consumed on class ab ammplifier 240 is equal to reference to DC voltage V1, DANGSHEN
Examining DC voltage V1 when being set as 100mV～200mV, its power consumption consumed is less than tradition G class A amplifier A
In the power consumption that consumes of class ab ammplifier, thus improve the work efficiency of audio output circuit further.
In this utility model, " connection ", be connected, word that " company ", the expression such as " connecing " are electrical connected, such as nothing
Special instruction, then it represents that direct or indirect electric connection.
It is pointed out that detailed description of the invention of the present utility model is done by one skilled in the art
Any change all without departing from the scope of claims of the present utility model.Correspondingly, of the present utility model
The scope of claim is also not limited only to previous embodiment.
Claims (6)
1. an audio output circuit, it is characterised in that it includes digital to analog converter, shaping circuit, adder, DC-to-DC converter, negative charge pump and class ab ammplifier,
Described digital to analog converter includes input and outfan, its input is connected with digital signal to be played, described digital to analog converter for being converted to analogue signal to be played by described digital signal to be played, and exports described analogue signal to be played by its outfan；
Described shaping circuit includes input and outfan, the input of described shaping circuit is connected with the outfan of described digital to analog converter, described shaping circuit carries out shaping for the analogue signal to be played exporting described digital to analog converter, and by the analogue signal after its outfan output Shaping；
First addend input of described adder is connected with the analogue signal after described shaping, its the second addend input and a reference DC voltage are connected, its outfan output reference voltage, described reference voltage is equal to VO+V1, wherein, VO is the magnitude of voltage of the analogue signal after described shaping, and V1 is the described magnitude of voltage with reference to DC voltage；
The power end of described DC-to-DC converter is connected with voltage source, its reference voltage terminal is connected with described reference voltage, described DC-to-DC converter is for carrying out DC-to-dc conversion to the voltage of described voltage source, and export malleation DC voltage by its outfan, and the malleation direct current Voltage Cortrol that described DC-to-DC converter is output it by negative feedback according to reference voltage is extremely equal to the magnitude of voltage of described reference voltage；
The input of described negative charge pump is connected with described malleation DC voltage, and described negative charge pump is used for described malleation DC voltage VP is carried out negative pressure conversion, the negative pressure DC voltage of its outfan output malleation DC voltage equal to-1 times；
The positive power source terminal of described class ab ammplifier is connected with malleation DC voltage, its negative power end is connected with described negative pressure DC voltage, its input is connected with described analogue signal to be played, its outfan is connected with load, described class ab ammplifier is for malleation DC voltage as positive supply, work for negative supply with negative pressure DC voltage, produce output voltage with analogue signal to be played for input voltage and drive load.
Audio output circuit the most according to claim 1, it is characterised in that
Described shaping circuit is when the magnitude of voltage of described analogue signal VA to be played is more than 0, and analogue signal VO after the shaping of its output is equal to analogue signal VA to be played；
Described shaping circuit is when the magnitude of voltage of described analogue signal VA to be played is less than 0, and analogue signal VO after the shaping of its output is equal to analogue signal VA to be played of-1 times.
Audio output circuit the most according to claim 2, it is characterised in that described shaping circuit includes control unit, the first switch, second switch and subtractor,
One connection end of described first switch is connected with the input of described shaping circuit, and its another connection end is connected with the outfan of described shaping circuit；The minuend input of described subtractor and 0 level are connected, and its subtracting input is connected with the input of described shaping circuit, its outfan output difference signal, and this difference signal is equal to 0-VA, and wherein, VA is the magnitude of voltage of analogue signal to be played, and 0 is 0 level；One connection end of second switch is connected with the outfan of described subtractor, and its another connection end is connected with the outfan of described shaping circuit；
The input of described control unit is connected with the input of described shaping circuit, first outfan of described control circuit is connected with the control end of described first switch, second outfan of described control circuit is connected with the control end of described second switch, when the magnitude of voltage of described analogue signal to be played is more than 0, described control unit controls the first switch conduction and controls second switch shutoff；When the magnitude of voltage of described analogue signal to be played is less than 0, described control unit controls the first switch OFF and controls second switch conducting.
Audio output circuit the most according to claim 3, it is characterised in that
Described control unit includes comparator and phase inverter, the normal phase input end of described comparator is as the input of described control unit, its anti-phase input terminates 0 level, its outfan is connected with the input of described phase inverter, the outfan of phase inverter is as the second outfan of described control unit, and the connection node between outfan and the input of phase inverter of described comparator is as the first outfan of described control unit.
Audio output circuit the most according to claim 1, it is characterised in that
Described is 100mV～200mV with reference to DC voltage.
Audio output circuit the most according to claim 1, it is characterised in that
The output voltage that described class ab ammplifier produces is differential output voltage,
Described load is earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620325459.3U CN205622841U (en) | 2016-04-18 | 2016-04-18 | Audio output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620325459.3U CN205622841U (en) | 2016-04-18 | 2016-04-18 | Audio output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205622841U true CN205622841U (en) | 2016-10-05 |
Family
ID=57030751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620325459.3U Withdrawn - After Issue CN205622841U (en) | 2016-04-18 | 2016-04-18 | Audio output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205622841U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704620A (en) * | 2016-04-18 | 2016-06-22 | 无锡中感微电子股份有限公司 | Audio output circuit |
-
2016
- 2016-04-18 CN CN201620325459.3U patent/CN205622841U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704620A (en) * | 2016-04-18 | 2016-06-22 | 无锡中感微电子股份有限公司 | Audio output circuit |
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Granted publication date: 20161005 Effective date of abandoning: 20180615 |
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