CN201733428U - Audio output circuit and mobile terminal with the same - Google Patents
Audio output circuit and mobile terminal with the same Download PDFInfo
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- CN201733428U CN201733428U CN2010202033401U CN201020203340U CN201733428U CN 201733428 U CN201733428 U CN 201733428U CN 2010202033401 U CN2010202033401 U CN 2010202033401U CN 201020203340 U CN201020203340 U CN 201020203340U CN 201733428 U CN201733428 U CN 201733428U
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Abstract
The utility model discloses an audio output circuit and a mobile terminal with the same, which comprise at least two paths of power amplifying chips and one path of an electroacoustic device, wherein the audio output end of one path of the power amplifying chip is directly connected with the electroacoustic device, the audio output ends of the other paths of the power amplifying chips are respectively connected with a bridging capacitor via a path of an audio frequency switch, and the bridging capacitor is connected with the electroacoustic device. The audio output circuit of the utility model has simple structure and low cost, effectively solves the crosstalk problem of the multiple paths of power amplifying chips which use the same path of the electroacoustic device, ensures the operation safety of various paths of the power amplifying chips, reduces the delay on software control, can meet the design requirements of all the audio systems, and is particularly suitable to be popularized and applied in the hardware circuit design of the mobile terminals of mobile phones and the like.
Description
Technical field
The utility model belongs to the audio system technical field, specifically, and the portable terminal that relates to the audio output circuit of the shared electro-acoustic element of a kind of a plurality of audio frequency output channel and adopt described audio output circuit design.
Background technology
For complicated at present audio system, through regular meeting the common phenomenon of using an electro-acoustic element of a plurality of audio frequency output channels appears.Because each road audio output circuit exists different output impedance and output voltage, therefore, can not simply each road audio frequency output directly be parallel on the electro-acoustic element, otherwise can produce the problem that one road voice-frequency channel wherein damages other one road voice-frequency channel.
In order to address this problem, the most frequently used method is to increase audio switch between multichannel voice frequency output channel and electro-acoustic element at present, referring to shown in Figure 1, promptly the multichannel voice frequency output channel is carried out gating and switch by simulant electronic switch, share same electro-acoustic element to realize each road audio frequency output.But, adopt the voicefrequency circuit of structure shown in Figure 1 between the audio frequency output channel 2 of the audio frequency output channel 1 of audio frequency power amplifier 1 and audio frequency power amplifier 2, to produce and crosstalk.Though for general audio switch, this value all more than 70dB, when the output energy of one road voice-grade channel wherein up to a certain degree the time, can be on other one road voice-grade channel signal that energy is very strong of generation.Such as when audio switch switches to passage 1, being about to passage 1 is communicated with electro-acoustic element, if the energy that passage 1 produces arrives to a certain degree greatly, a signal that energy is very strong will appear on passage 2 so, if and the output impedance of audio frequency power amplifier 2 is smaller, then will instead be poured into audio frequency power amplifier 2 through the signal that audio switch is crosstalked on the passage 2, thereby cause the damage of audio frequency power amplifier 2 from path 1.Especially when wherein one road audio frequency power amplifier was D class power amplifier, this situation was especially serious.Trace it to its cause two aspect factors below main the existence:
(1) because the signal waveform of D class power amplifier output is a square wave, under this pattern, the square-wave signal of high frequency can be crosstalked on other one road audio frequency output channel by simulant electronic switch, thereby might influence even damage the audio frequency power amplifier on other one road voice-frequency channel.In order to address this problem, the main at present design that adopts is to increase simulant electronic switch on audio frequency output channel, referring to circuit structure shown in Figure 2, by with the cascade of multi-channel analog electronic switch, to increase the isolation between the voice-frequency channel.Because at present general in the industry switching device, the isolation of most of simulant electronic switch all about 70dB, if want to obtain higher isolation, then needs to use more switches to carry out cascade.Though this design has reduced the cross-interference issue between the voice-frequency channel to a certain extent, owing to need to use more simulant electronic switch device, therefore cause hardware cost to raise, controlling mechanism is loaded down with trivial details relatively.
(2) if simulant electronic switch and D class power amplifier use the power supply power supply of same road, then the instantaneous meeting of overshoot of the rising edge of D class power amplifier output square wave surpasses the supply power voltage of simulant electronic switch, thereby might cause the damage of simulant electronic switch.In order to address this problem, must to improve the supply power voltage of simulant electronic switch, and make its supply power voltage be higher than the maximum of D class power amplifier output signal.But this need design the electric power system of multivoltage, thereby causes the increasing of circuit complexity, and therefore the rising of system hardware cost can not satisfy the designing requirement of all systems.
The utility model content
The purpose of this utility model is to provide a kind of simple in structure and audio output circuit that cost is relatively low, when solving the shared electro-acoustic element of multichannel voice frequency power amplifier, the output signal of one road audio frequency power amplifier problem that other each road audio frequency power amplifiers are impacted even damage wherein.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of audio output circuit, comprise two-way power amplifier chip and one road electro-acoustic element at least, wherein the audio output of one road power amplifier chip directly connects electro-acoustic element, the audio output of all the other each road power amplifier chips connects capacitance by one road audio switch separately, connects described electro-acoustic element through capacitance.
Further, with the power amplifier chip of the direct-connected power amplifier chip of described electro-acoustic element for the output square-wave signal, all the other each road power amplifier chip sine wave output signals.
Preferably, with the direct-connected power amplifier chip of described electro-acoustic element be D class power amplifier chip, all the other each road power amplifier chips are non-D class power amplifier chip, for example category-A, category-B or AB class power amplifier chip etc.
In order to reduce the crosstalk strength between each road power amplifier chip, described audio switch preferably adopts commutator to carry out circuit design, its first group alternative passage connects the audio output of power amplifier chip, second group of alternative passage is by high-pass filtering circuit ground connection, the common port of the audio switch described capacitance of connecting, and connect electro-acoustic element through described capacitance.
Further, described high-pass filtering circuit is in series by electric capacity and resistance.
For the output impedance of each road power amplifier chip of balance, between the audio output of first group of alternative passage of described audio switch and power amplifier chip, also be in series with resistance.
Further again, the control end of described audio switch connects primary processor, and the switch that receives primary processor output is selected signal.
Further again, described audio switch is the dpdt double-pole double-throw (DPDT) simulant electronic switch, two paths of its first group of alternative passage respectively with the corresponding connection of two-way audio output of power amplifier chip, two paths of second group of alternative passage are separately by one road high-pass filtering circuit ground connection, are in series with one tunnel described capacitance separately in the connecting path of the two-way common port of described audio switch and electro-acoustic element.
Further, the audio signal of described power amplifier chip output is monophony difference audio signal or the single-ended audio signal of dual track.
Based on above-mentioned audio output circuit structure, the utility model provides a kind of portable terminal that adopts described audio output circuit design again, directly be connected by audio output with electro-acoustic element with wherein one road power amplifier chip of portable terminal, such as being used for the outer D class power amplifier chip of putting the bell sound in the portable terminal, the audio output of all the other each road power amplifier chips is then undertaken being connected with described electro-acoustic element after gating switches by one road audio switch separately again, such as being used to AB class power amplifier chip of handling the voice signal of coming etc., thereby can reduce the energy loss that the conduction impedance because of audio switch causes by wireless network transmissions; Meanwhile, by the capacitance of in the connection line of audio switch and electro-acoustic element, further connecting, thereby can avoiding wherein, the dc offset voltage of one road voice-grade channel forms reverse irrigated current, instead irritate to other power amplifier chip, other power amplifier chip is caused the problem of damage, effectively guaranteed the security of operation of audio output circuit.
Compared with prior art, advantage of the present utility model and good effect are: audio output circuit of the present utility model is simple in structure, with low cost, efficiently solve the cross-interference issue between the multichannel power amplifier chip of common use one road electro-acoustic element, guaranteed the security of operation of each road power amplifier chip, reduced the time-delay in the software control simultaneously, can satisfy the designing requirement of all audio systems, be particluarly suitable for applying in the hardware circuit design of portable terminals such as mobile phone.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the audio output circuit schematic diagram of an electro-acoustic element of traditional multichannel voice frequency path sharing;
Fig. 2 is the audio output circuit schematic diagram that adopts a plurality of audio switch cascades;
Fig. 3 is the circuit theory diagrams of a kind of embodiment of the audio output circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
The utility model is in order to reduce energy loss, when the audio output circuit of shared one road electro-acoustic element of design multichannel voice frequency passage, the audio output of one road power amplifier chip wherein directly is connected with electro-acoustic element, and all the other each road power amplifier chips are then undertaken being connected with described electro-acoustic element after gating switches by audio switch again.So, when using,, this road voice-grade channel carries out gating owing to need not to pass through audio switch with power amplifier chip output audio signal that electro-acoustic element directly is communicated with, therefore, and the energy loss problem that can avoid the conduction impedance because of audio switch to cause.Meanwhile, at the capacitance of connecting between audio switch and the electro-acoustic element, isolate crosstalking between the voice-frequency channel, the effect of protection power amplifier chip thereby can play by further.
The power amplifier chip (such as D class power amplifier chip) that preferably will export square-wave signal in described audio output circuit is directly connected on the electro-acoustic element, and the power amplifier chip of all the other each road sine wave output signals (such as power amplifier chips such as category-A, category-B or AB classes) then is connected described electro-acoustic element by audio switch with capacitance.
Be example below with the mobile phone, elaborate the concrete establishment structure and the operation principle thereof of described audio output circuit by a specific embodiment.
Embodiment one, in the hardware designs of hand-hold multimedia portable terminal, especially in the circuit design of cell phone platform, in order to reduce system power dissipation, increasing cell phone system is favored in using D class power amplifier to promote loud speaker output, with function such as realize that the tinkle of bells is put, amplified outward.Owing to need the bigger volume of loud speaker output, therefore require the power of D class power amplifier output bigger.But, consider factors such as noise, voice call receiving circuit part is still used the amplifying circuit of AB class, will pass through the electro-acoustic element playback by the voice signal that the mobile phone wireless Network Transmission is come.Because the user when answering voice call, is to allow electro-acoustic element be close to people's ear, so the output signal energy of AB class power amplifier can be less.Consider the demand on handset structure, function, the cost, the audio frequency output channel of its tinkle of bells and call voice needs the common loud speaker (electro-acoustic element a kind of) that uses.If the audio frequency output channel of D class power amplifier and AB class power amplifier is directly connected on the loud speaker, the output signal that D class power amplifier then can occur burns out audio switch or by the audio switch problems such as burning out AB class power amplifier of crosstalking.In order to protect the power amplifier chip, present embodiment is with D class power amplifier chip U
DAudio output directly be connected AB class power amplifier chip U with loud speaker BT
ABAudio output be connected described loud speaker BT with capacitance C3/C4 by audio switch K1, referring to shown in Figure 3, to increase by two isolations between the voice-frequency channel.If with D class power amplifier chip U
DThe audio signal of output is also carried out gating by audio switch and is switched, and tends to bring two aspect problems: the first, and by D class power amplifier chip U
DThe audio signal of output can produce audio switch impacts; It two is, audio switch is causing all there is a conduction impedance RON under the state, generally speaking, and about RON=0.5 Ω; For differential signal, whole load will increase by the conduction impedance of 2 * RON=1 Ω.And the conventional employed loud speaker BT of portable terminals such as mobile phone, its impedance is generally 8 Ω, is equivalent to have 1/9th energy dissipation on the audio switch.For fear of the energy loss that the conduction impedance because of audio switch causes, present embodiment is preferably with D class power amplifier chip U
DAudio output be directly connected on the loud speaker BT.
Present embodiment is that example describes with the difference audio signal, and described audio switch K1 can adopt a dpdt double-pole double-throw (DPDT) simulant electronic switch to carry out circuit design, as shown in Figure 3.The differential input end that two-way common port COM1, the COM2 of audio switch K1 is connected loud speaker BT respectively by capacitance C3, the C4 of series connection, make by the audio signal of simulant electronic switch K1 gating and carry out after straight processing, transfer to loud speaker BT again and play through capacitor C 3, C4.It is for following consideration that present embodiment is introduced capacitance C3, C4 here: if with AB class power amplifier chip U
ABAudio output be directly connected to D class power amplifier chip U by simulant electronic switch K1
DAudio output on, though AB class power amplifier chip U
ABThe signal energy of output is less, but differential signal all has dc offset voltage on every transmission lines, and this dc offset voltage forms reverse irrigated current easily, flow into D class power amplifier chip U
DIn, thereby cause D class power amplifier chip U
DDamage.For fear of this problem, present embodiment is at common port COM1, COM2 and the D class power amplifier chip U of simulant electronic switch K1
DAudio frequency output channel between set up two capacitance C3 and C4.By these two capacitance C3, C4, can make AB class power amplifier chip U
ABThe direct current biasing that is produced can the anti-D of being poured into class power amplifier U
DIn, while AB class power amplifier chip U
ABThe AC audio signal of being exported also can successfully arrive loud speaker BT, to guarantee the normal play of voice call.
In addition, described capacitance C3, C4 can form a high pass filter with loud speaker BT, by changing the appearance value size of capacitance C3, C4, can adjust the low frequency cut-off points of high pass filter, thereby satisfy the demand of different application environment.
On the other hand, as gating D class power amplifier chip U
DDuring work, by D class power amplifier chip U
DThe difference audio signal of output is input to simulant electronic switch K1 again behind capacitance C3 and C4 attenuation filter.Because the existence of capacitance C3, C4 makes by D class power amplifier chip U
DThe rising edge overshoot spike of the square wave audio signal of output is filtered out, thereby guarantees to connect D class power amplifier chip U
DSignal amplitude on every transmission lines of audio output can be greater than VDD2, i.e. D class power amplifier chip U
DThe supply power voltage amplitude.So, even simulant electronic switch K1 and D class power amplifier chip U
DUse power supply VDD1, the VDD2 of same voltage magnitude, also can not cause damage, thereby played protection simulant electronic switch K1, reduce the purpose of design of system complex degree simulant electronic switch K1.
Be crosstalked into AB class power amplifier chip U in order further to reduce
ABSignal strength signal intensity, present embodiment with two path A1, A2 of first group of alternative passage of simulant electronic switch K1 respectively with AB class power amplifier chip U
ABCorresponding connection of difference audio output, two path B1, B2 of second group of alternative passage are separately by one road high-pass filtering circuit ground connection.In the present embodiment, described high-pass filtering circuit can adopt capacitor C 1/C2 and resistance R 1/R2 series connection to realize, as shown in Figure 3.
Adopt the sort circuit design, selecting D class power amplifier chip U
DDuring work, be second group of alternative passage because the simulant electronic switch K1 of this moment is communicated with, promptly COM1 is communicated with B1, COM2 is communicated with B2, therefore, and by D class power amplifier chip U
DThe audio signal of output is coupled on high-pass filtering circuit C1/R1, the C2/R2 through capacitance C3, C4, and then is undertaken making to be crosstalked into AB class power amplifier chip U after attenuation of signal intensity handles by these two RC high pass filters
ABSignal strength signal intensity reduce greatly, thereby avoided AB class power amplifier chip U
ABOwing to the excessive damage that causes of the signal strength signal intensity of crosstalking, improved the fail safe and the reliability of machine system operation.
Because the impedance of general loud speaker BT is 8 Ω, and the design impedance of general mobile phone speech path AB class power amplifier is 32 Ω, so present embodiment is at AB class power amplifier chip U
ABDifference audio output signal path on connect separately one tunnel resistance R 3, R4, as shown in Figure 3, to be used for the output impedance of balance AB class power amplifier and D class power amplifier.
The simulant electronic switch K1 of present embodiment is controlled by the primary processor of cell phone mainboard, and such as baseband chip, the high-low level switch that utilizes its control end SEL to receive primary processor output is selected signal, with the direction of determining that switch switches.In the present embodiment, when no any voice output or D class power amplifier chip U
DDuring work, also or two power amplifier chip U
D, U
ABWhen working simultaneously, primary processor output high level signal, control simulant electronic switch K1 is communicated with second group of alternative channel B 1, B2; And only need AB class power amplifier chip U
ABDuring work, primary processor output low level signal, control simulant electronic switch K1 is communicated with first group of alternative passage A1, A2, to guarantee the normal output of call voice.
It should be noted that especially: include capacitive device and perceptual device owing in this voicefrequency circuit, therefore need the special latency issue of handling under some states, such as working as D class power amplifier chip U
DAfter hours, if simulant electronic switch K1 is switched to first group of alternative passage A1, A2 at once, i.e. gating AB class power amplifier chip U
AB, then the electric weight of the last storage of capacitance C3 and C4 can cause AB class power amplifier chip U
ABDamage.In order to address this problem, present embodiment is handled for this class action adds software delay, promptly controls D class power amplifier chip U earlier
DClose, after the time-delay of waiting for a period of time again (Millisecond), control simulant electronic switch K1 again and switch, thereby on sequential mechanism, protected two power amplifier chip U
D, U
AB
Certainly, the voicefrequency circuit design of present embodiment also can expand in the gating design of multichannel voice frequency passage more easily, only needs quantity according to voice-grade channel on the basis of circuit shown in Figure 3, copies AB class power amplifier chip U
ABThe voice-grade channel design carry out adaptability expansion and get final product, present embodiment no longer launches explanation at this.
Present embodiment is when selecting simulant electronic switch K1, consider power amplifier chip or output monophony difference audio signal at present a lot of mobile phone circuits, therefore the single-ended audio signal of output dual track adopts double-point double-throw switch shown in Figure 3 to meet design requirement.Certainly, need export the power amplifier chip of single-ended monophonic audio signal, only need to adopt single-pole double-throw switch (SPDT) to meet design requirement for some.And require the power amplifier chip of output dual track difference audio signal for some, only needing similarly to expand set of circuits again on the basis of circuit shown in Figure 3 gets final product, circuit shown in Figure 3 is used for handling output L channel difference audio signal, and the set of circuits that expansion is come out is used for handling output R channel difference audio signal and gets final product.Present embodiment is in this explanation no longer one by one.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. audio output circuit, comprise two-way power amplifier chip and one road electro-acoustic element at least, it is characterized in that: wherein the audio output of one road power amplifier chip directly connects electro-acoustic element, the audio output of all the other each road power amplifier chips connects capacitance by one road audio switch separately, connects described electro-acoustic element through capacitance.
2. audio output circuit according to claim 1 is characterized in that: with the power amplifier chip of the direct-connected power amplifier chip of described electro-acoustic element for the output square-wave signal, all the other each road power amplifier chip sine wave output signals.
3. audio output circuit according to claim 1 is characterized in that: with the direct-connected power amplifier chip of described electro-acoustic element be D class power amplifier chip, all the other each road power amplifier chips are non-D class power amplifier chip.
4. according to each described audio output circuit in the claim 1 to 3, it is characterized in that: described audio switch is a commutator, its first group alternative passage connects the audio output of power amplifier chip, second group of alternative passage be by high-pass filtering circuit ground connection, the common port of the audio switch described capacitance of connecting.
5. audio output circuit according to claim 4 is characterized in that: described high-pass filtering circuit is composed in series by electric capacity and resistance.
6. audio output circuit according to claim 4 is characterized in that: be in series with resistance between the audio output of first group of alternative passage of described audio switch and power amplifier chip.
7. audio output circuit according to claim 4 is characterized in that: the control end of described audio switch connects primary processor, and the switch that receives primary processor output is selected signal.
8. audio output circuit according to claim 7, it is characterized in that: described audio switch is the dpdt double-pole double-throw (DPDT) simulant electronic switch, two paths of its first group of alternative passage respectively with the corresponding connection of two-way audio output of power amplifier chip, two paths of second group of alternative passage are separately by one road high-pass filtering circuit ground connection, are in series with one tunnel described capacitance separately in the connecting path of the two-way common port of described audio switch and electro-acoustic element.
9. audio output circuit according to claim 8 is characterized in that: the audio signal of described power amplifier chip output is monophony difference audio signal or the single-ended audio signal of dual track.
10. a portable terminal is characterized in that: include as the described audio output circuit of each claim in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202033401U CN201733428U (en) | 2010-05-17 | 2010-05-17 | Audio output circuit and mobile terminal with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202033401U CN201733428U (en) | 2010-05-17 | 2010-05-17 | Audio output circuit and mobile terminal with the same |
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| CN201733428U true CN201733428U (en) | 2011-02-02 |
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| CN2010202033401U Expired - Fee Related CN201733428U (en) | 2010-05-17 | 2010-05-17 | Audio output circuit and mobile terminal with the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790934A (en) * | 2011-05-20 | 2012-11-21 | 联发科技股份有限公司 | Amplifier circuit in parallel |
| CN103813238A (en) * | 2014-03-03 | 2014-05-21 | 联想(北京)有限公司 | Audio control circuit and electronic device |
| WO2014166243A1 (en) * | 2013-08-19 | 2014-10-16 | 中兴通讯股份有限公司 | Multi-terminal multi-channel independent play method and apparatus |
| CN104640018A (en) * | 2013-11-14 | 2015-05-20 | 展讯通信（上海）有限公司 | Electronic equipment and audio output circuit |
| CN104967946A (en) * | 2015-06-10 | 2015-10-07 | 上海芯望电子技术有限公司 | Multichannel audio processor |
| CN107635063A (en) * | 2017-08-28 | 2018-01-26 | 深圳市金立通信设备有限公司 | A kind of audio output device and terminal |
| CN110891225A (en) * | 2018-09-07 | 2020-03-17 | 中兴通讯股份有限公司 | Audio signal processing method, device, equipment and storage medium |
-
2010
- 2010-05-17 CN CN2010202033401U patent/CN201733428U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790934A (en) * | 2011-05-20 | 2012-11-21 | 联发科技股份有限公司 | Amplifier circuit in parallel |
| WO2014166243A1 (en) * | 2013-08-19 | 2014-10-16 | 中兴通讯股份有限公司 | Multi-terminal multi-channel independent play method and apparatus |
| CN104426832A (en) * | 2013-08-19 | 2015-03-18 | 中兴通讯股份有限公司 | Multi-terminal multichannel independent playing method and device |
| CN104640018A (en) * | 2013-11-14 | 2015-05-20 | 展讯通信（上海）有限公司 | Electronic equipment and audio output circuit |
| CN103813238A (en) * | 2014-03-03 | 2014-05-21 | 联想(北京)有限公司 | Audio control circuit and electronic device |
| CN103813238B (en) * | 2014-03-03 | 2019-04-23 | 联想(北京)有限公司 | A kind of audio control circuit and electronic equipment |
| CN104967946A (en) * | 2015-06-10 | 2015-10-07 | 上海芯望电子技术有限公司 | Multichannel audio processor |
| CN104967946B (en) * | 2015-06-10 | 2018-10-09 | 上海韦尔半导体股份有限公司 | A kind of multi-channel audio processor |
| CN107635063A (en) * | 2017-08-28 | 2018-01-26 | 深圳市金立通信设备有限公司 | A kind of audio output device and terminal |
| CN107635063B (en) * | 2017-08-28 | 2020-01-03 | 深圳市金立通信设备有限公司 | Audio output device and terminal |
| CN110891225A (en) * | 2018-09-07 | 2020-03-17 | 中兴通讯股份有限公司 | Audio signal processing method, device, equipment and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20130517 |