CN102790934B - Amplifier circuit in parallel - Google Patents
Amplifier circuit in parallel Download PDFInfo
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- CN102790934B CN102790934B CN201210155299.9A CN201210155299A CN102790934B CN 102790934 B CN102790934 B CN 102790934B CN 201210155299 A CN201210155299 A CN 201210155299A CN 102790934 B CN102790934 B CN 102790934B
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- amplifier circuit
- amplified signal
- parallel
- signal
- supply voltage
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Abstract
The invention provides an amplifier circuit in parallel, comprising a first amplifier circuit, a second amplifier circuit, an output load and a protection circuit. The first amplifier circuit is coupled to a first supply voltage for generating a first amplified signal. The second amplifier circuit is coupled to a second supply voltage for generating a second amplified signal. The output load is used for receiving and outputting the first amplified signal and the second amplified signal. The protection circuit is coupled to a pair of differential motion output ends of the first amplifier circuit for reducing a swing range of the signal at the differential motion output end when a load reception is output and the second amplified signal is output. The amplifier circuit in parallel can provide good voice quality and reduce noise interference.
Description
Technical field
The present invention about a kind of amplifier circuit in parallel, especially in regard to a kind of amplifier circuit in parallel reducing noise.
Background technology
Mobile phone has become very general individual portable electronic devices now.Except simply dial with receive calls except, mobile phone also starts as user provides increasing multimedia recreation service.Therefore, the diversity of multimedia recreation correlation function also becomes another primary concern that user selects mobile phone gradually.For example, nearly all mobile phone all has built-in MP3 player, camera and Java (Java) engine.For mobile phone manufacturer, when audio quality is exploitation multimedia recreation application function, be worth the key factor considered.
Fig. 1 is the design calcspar of tradition two loud speakers.The sound buffer (voice buffer) 101 of receiving terminal receives voice signal SVoice, voice emplifying signal SVoice from a digital signal processor (not shown) and amplified voice signal is sent to the first loud speaker 103.First loud speaker 103 is arranged at the receiving terminal of the ear near mobile phone user usually, for playing out the sound of the remote speaker in conversing with mobile phone user.Audio buffer (audio buffer) 201 is configured on different signal processing paths from sound buffer 101, for received audio signal SAudio, amplifies audio signal SAudio and audio signal SAudio is sent to amplifier 202.Amplifier 202 amplifies audio signal SAudio further and amplified audio signal is sent to the second loud speaker 203.Second loud speaker 203 is generally used for music or the tinkle of bells to play back, and makes mobile phone user need not can listen to these music through earphone.
In order to save manufacturing cost and space, need a kind of amplifier circuit in parallel being applicable to mobile phone, it can provide good sound quality and reduce noise jamming.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of amplifier circuit in parallel, to solve the problem.
According to one embodiment of the invention, a kind of amplifier circuit in parallel comprises the first amplifier circuit, the second amplifier circuit, output loading and protective circuit.First amplifier circuit is coupled to the first supply voltage, for generation of the first amplified signal.Second amplifier circuit is coupled to the second supply voltage, for generation of the second amplified signal.Output loading is for receiving and exporting the first or second amplified signal.Protective circuit is coupled to the pair of differential output of the first amplifier circuit, during for receiving in output loading and exporting the second amplified signal, is reduced to this amplitude of oscillation to the signal of differential output end.
According to another embodiment of the present invention, a kind of amplifier circuit in parallel comprises the first amplifier circuit, the second amplifier circuit, output loading and protective circuit.First amplifier circuit is coupled to the first supply voltage, for generation of the first amplified signal.Second amplifier circuit is coupled to the second supply voltage, and for generation of the second amplified signal, wherein the second supply voltage is higher than the first supply voltage.Output loading is for receiving and exporting the first amplified signal or the second amplified signal.Protective circuit is coupled to the pair of differential output of the first amplifier circuit; during for receiving in output loading and exporting the second amplified signal, the maximum amplitude of oscillation of the signal of differential output end is defined in is no more than in this voltage sum that the first supply voltage adds a critical voltage.
According to another embodiment of the present invention, a kind of amplifier circuit in parallel comprises the first amplifier circuit, the second amplifier circuit, output loading and protective circuit.First amplifier circuit is coupled to the first supply voltage, for generation of the first amplified signal.Second amplifier circuit is coupled to the second supply voltage, for generation of the second amplified signal.Output loading is for receiving and exporting the first amplified signal or the second amplified signal.Protective circuit is coupled to the pair of differential output of the first amplifier circuit, during for receiving in output loading and exporting the second amplified signal, reduces because being injected into the amplitude of oscillation of the signal of the first supply voltage to the signal of differential output end in this.
The amplifier circuit in parallel of the embodiment of the present invention, can provide good sound quality and reduce noise jamming.
Accompanying drawing explanation
Fig. 1 is the design calcspar of tradition two loud speakers;
Fig. 2 is the calcspar of the amplifier circuit in parallel according to one embodiment of the invention;
Fig. 3 is the circuit diagram of the amplifier circuit in parallel according to one embodiment of the invention;
Fig. 4 is the circuit diagram of amplifier circuit in parallel described according to another embodiment of the present invention;
Fig. 5 is the circuit diagram of amplifier circuit in parallel described according to still another embodiment of the invention;
Fig. 6 is the circuit diagram of the amplifier circuit in parallel according to one more embodiment of the present invention;
Fig. 7 is the circuit diagram of the amplifier circuit in parallel again again described in an embodiment according to the present invention.
Embodiment
For making manufacture of the present invention, method of operation, target and advantage become apparent, several preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below:
Embodiment:
Fig. 2 is the calcspar of the amplifier circuit in parallel according to one embodiment of the invention.Amplifier circuit in parallel comprises the first amplifier circuit 310 and the second amplifier circuit 320.First amplifier circuit 310 and the second amplifier circuit 320 coupled in parallel are to output loading, and wherein in an embodiment of the present invention, output loading is a loud speaker 330.According to one embodiment of the invention, the first amplifier circuit 310 is for producing amplified voice signal according to the voice signal SVoice received, and the second amplifier circuit 320 is for producing amplified audio signal according to the audio signal SAudio received.Loud speaker 330 by the first amplifier circuit 310 and the second amplifier circuit 320 share, play (that is, receive with export) amplified voice signal and amplified audio signal for selectivity.According to one embodiment of the invention, when the second amplifier circuit 320 is enabled for amplifying the audio signal SAudio and loud speaker 330 that receive for playing amplified audio signal, the first amplifier circuit 310 is disabled.On the other hand, when the first amplifier circuit 310 is enabled for amplifying the voice signal SVoice and loud speaker 330 that receive for playing amplified voice signal, the second amplifier circuit 320 is disabled.
According to one embodiment of the invention, in order to obtain large energy to amplify audio signal SAudio, the second amplifier circuit 320 is coupled to battery (not shown), for receiving supply voltage VBAT.Different from the second amplifier circuit 320, the first amplifier circuit 310 is coupled to and receives another supply voltage VA.Supply voltage VA produced according to supply voltage VBAT by pressurizer (such as, low-dropout regulator (low dropout regulator)), and its voltage is lower than the voltage of supply voltage VBAT.As above-mentioned, when loud speaker 330 is for playing amplified audio signal, the first amplifier circuit 310 is disabled.Therefore, see fashionable, it is seen that high impedance from pair of differential output VB_OP and the VB_ON of the first amplifier circuit 310 toward the direction of the first amplifier circuit 310.But, if the signal swing (swing) produced in differential output end LSPK_OP and LSPK_ON is excessive, leakage current IP and the IN undesirably occurred will have influence on the supply voltage VA of the first amplifier circuit 310 through the parasitic diode of differential output end VB_OP and VB_ON, cause the problem that degradation under the coupling effect of system and reliability is serious.It should be noted that, signal swing (swing) scope produced in differential output end VB_OP and VB_ON by leakage current IP and the IN undesirably occurred can from 0 volt (V) to supply voltage VBAT(such as, 4.3V), therefore its maximum amplitude of oscillation can far above supply voltage VA(such as, 2.8V).In order to avoid or reduce these impact; according to one embodiment of the invention; protective circuit 340 is added between the first amplifier circuit 310 and loud speaker 330; for be disabled when the first amplifier circuit 310 and the second amplifier circuit 320 be enabled for amplify receive audio signal SAudio time, be defined in the voltage of differential output end VB_OP and VB_ON.Protective circuit 340 can also reduce the amplitude of oscillation being injected into the signal of the first supply voltage VA because of the signal in differential output end VB_OP and VB_ON.According to one embodiment of the invention, the maximum amplitude of oscillation in the signal of differential output end VB_OP and VB_ON can be reduced to close to supply voltage VA, or the first amplifier circuit 310 is enough to the voltage that bears.Such as, the maximum amplitude of oscillation can be lowered to the voltage sum at least lower than supply voltage VA and a critical voltage (such as, the conducting voltage of parasitic diode).Thus, parasitic diode can be avoided to be switched on because of leakage current IP and the IN undesirably occurred.
Fig. 3 is the circuit diagram of the amplifier circuit in parallel according to one embodiment of the invention.According to this embodiment of the invention, first amplifier circuit can comprise sound buffer 311, for producing amplified voice signal according to the voice signal SVoice received, and the second amplifier circuit can comprise audio buffer 321, for producing amplified audio signal according to the audio signal SAudio received.Second amplifier circuit also can comprise an amplifier 322, amplifies further for amplified audio signal being done.In the embodiment shown in fig. 3, protective circuit can comprise a resistance-type device 341, and it is coupled between differential output end VB_OP and VB_ON.The resistance value of resistance-type device 341 can be designed to according to being coupled to the resistance value of resistance-type device R1 and the R2 between sound buffer 311 and loud speaker 330 and determining.By resistance-type device 341, primary Ioops can be formed from end points LSPK_OP, VB_OP to end points VB_ON and LSPK_ON, therefore, the signal swing of differential output end VB_OP and VB_ON can be reduced to.
Fig. 4 is the circuit diagram of amplifier circuit in parallel described according to another embodiment of the present invention.In this embodiment, protective circuit can comprise a switching device shifter 342, and it is coupled between differential output end VB_OP and VB_ON.Switching device shifter 342 can be opened when sound buffer 311 is enabled, and is finally closed when sound buffer 311 is disabled.When switching device shifter 342 is finally closed, primary Ioops can be formed from end points LSPK_OP, VB_OP to end points VB_ON and LSPK_ON, therefore, the signal swing of differential output end VB_OP and VB_ON can be reduced to.
Fig. 5 is the circuit diagram of amplifier circuit in parallel described according to still another embodiment of the invention.In this embodiment, when load for receive and output audio buffer 321 export signal time, protective circuit makes sound buffer 311 and this load disconnect.Particularly, in this embodiment, protective circuit can comprise pair of switching devices 343 and 344, and it is coupled between differential output end VB_OP and VB_ON and resistance-type device R1 and R2.Switching device shifter 343 and 344 can be opened when sound buffer 311 is disabled, and is finally closed when sound buffer 311 is enabled.When switching device shifter 343 and 344 is opened, leakage current IP and the IN undesirably occurred can not flow to differential output end VB_OP and VB_ON, therefore, can be reduced to the signal swing of differential output end VB_OP and VB_ON.
Fig. 6 is the circuit diagram of the amplifier circuit in parallel according to one more embodiment of the present invention.In this embodiment, protective circuit can comprise pair of switching devices 345 and 346, and it is coupled between resistance-type device R1 and R2 and loud speaker 330.Similar to the circuit shown in Fig. 5, switching device shifter 345 and 346 can be opened when sound buffer 311 is disabled, and is finally closed when sound buffer 311 is enabled.When switching device shifter 345 and 346 is opened, leakage current IP and the IN undesirably occurred can not flow to differential output end VB_OP and VB_ON, therefore, can be reduced to the signal swing of differential output end VB_OP and VB_ON.
Fig. 7 is the circuit diagram of another amplifier circuit in parallel again described in an embodiment according to the present invention.In this embodiment, protective circuit can comprise a pair load device 347 and 348, and it is respectively coupled between differential output end VB_OP and VB_ON and earth point.Load device 347 and 348 can comprise an electric capacity and a resistance-type device.By load device 347 and 348, respectively can form primary Ioops to earth point and from end points VB_ON to earth point from end points VB_OP, therefore, the signal swing of differential output end VB_OP and VB_ON can be reduced to.
Although the present invention by the example of above-described various kinds of protective circuit as preferred embodiment to set forth inventive concept, but it should be noted that the present invention is not limited to the scope shown in Fig. 3-7.Any (those of ordinary skill in the art can understand easily) can reduce or be defined in the voltage of differential output end VB_OP and VB_ON, the circuit modifications be switched on for avoiding the parasitic diode being coupled to sound buffer and/or provide the first amplifier circuit 310 to be enough to the voltage born in differential output end VB_OP and VB_ON, displacement or similar arrangement, all should belong to scope of the present invention.Therefore, claim of the present invention should most broadly be understood, to forgive any possible circuit modifications, displacement or similar arrangement.
Although the present invention discloses as above with specific embodiment; so it is only for ease of illustrating technology contents of the present invention; and not the present invention is narrowly defined in this embodiment; any those skilled in the art; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on claim institute of the present invention confining spectrum.
Claims (16)
1. an amplifier circuit in parallel, is characterized in that, comprising:
One first amplifier circuit, is coupled to one first supply voltage, for generation of one first amplified signal;
One second amplifier circuit, is coupled to one second supply voltage, for generation of one second amplified signal;
One output loading, for receiving and exporting the described first or second amplified signal; And
One protective circuit; be coupled to the pair of differential output of described first amplifier circuit; during for receiving in described output loading and exporting described second amplified signal, the maximum amplitude of oscillation in the described signal to differential output end is defined in and is no more than the voltage sum that described first supply voltage adds the conducting voltage of parasitic diode.
2. amplifier circuit in parallel as claimed in claim 1, it is characterized in that, when described output loading is for receiving and exporting described second amplified signal, described first amplifier circuit is disabled, and when described output loading is for receiving and exporting described first amplified signal, described second amplifier circuit is disabled.
3. amplifier circuit in parallel as claimed in claim 1; it is characterized in that; described second supply voltage is higher than described first supply voltage; and when described output loading is for receiving and exporting described second amplified signal, described protective circuit is used for the maximum amplitude of oscillation in the described signal to differential output end to be low to moderate voltage close to described first supply voltage from the voltage drop of described second supply voltage.
4. amplifier circuit in parallel as claimed in claim 1, is characterized in that, described protective circuit comprise be coupled to described to the resistance-type device between differential output end.
5. amplifier circuit in parallel as claimed in claim 1, is characterized in that, described protective circuit comprise be coupled to described to the switching device shifter between differential output end.
6. amplifier circuit in parallel as claimed in claim 1, is characterized in that, described protective circuit comprise be respectively coupled to described to a pair load device between differential output end and an earth point.
7. amplifier circuit in parallel as claimed in claim 1, is characterized in that, when described output loading is for receiving and exporting described second amplified signal, described first amplifier circuit disconnects the connection with described output loading.
8. amplifier circuit in parallel as claimed in claim 1; it is characterized in that; described protective circuit comprise be respectively coupled to described to the pair of switching devices between differential output end and described output loading; for when described output loading is for receiving and exporting described second amplified signal, described first amplifier circuit and described output loading are disconnected.
9. amplifier circuit in parallel as claimed in claim 1; it is characterized in that; described protective circuit also for when described output loading is for receiving and exporting described second amplified signal, reduces the amplitude of oscillation because being injected into the signal of described first supply voltage in the described signal to differential output end.
10. an amplifier circuit in parallel, is characterized in that, comprising:
One first amplifier circuit, is coupled to one first supply voltage, for generation of one first amplified signal;
One second amplifier circuit, is coupled to one second supply voltage, and for generation of one second amplified signal, wherein said second supply voltage is higher than described first supply voltage;
One output loading, for receiving and exporting the described first or second amplified signal; And
One protective circuit; be coupled to the pair of differential output of described first amplifier circuit; during for receiving in described output loading and exporting described second amplified signal, the maximum amplitude of oscillation in the described signal to differential output end is defined in and is no more than the voltage sum that described first supply voltage adds the conducting voltage of parasitic diode.
11. amplifier circuit in parallel as claimed in claim 10, it is characterized in that, described first amplifier circuit comprises:
One sound buffer, produces described first amplified signal for the voice signal that receives according to one;
Described second amplifier circuit comprises:
One audio buffer, produces described second amplified signal for the audio signal that receives according to one; And
Described output loading comprises:
One loud speaker, described first amplified signal and the second amplified signal is play for selectivity, wherein when described second amplified signal play by described loud speaker, described sound buffer is disabled, when described loud speaker is for playing described first amplified signal, described audio buffer is disabled.
12. amplifier circuit in parallel as claimed in claim 10, is characterized in that, described protective circuit comprise be coupled to described to the resistance-type device between differential output end.
13. amplifier circuit in parallel as claimed in claim 10, is characterized in that, described protective circuit comprise be coupled to described to the switching device shifter between differential output end.
14. amplifier circuit in parallel as claimed in claim 10, is characterized in that, described protective circuit comprise be respectively coupled to described to the pair of switching devices between differential output end and described output loading.
15. amplifier circuit in parallel as claimed in claim 10, is characterized in that, described protective circuit comprise be respectively coupled to described to a pair load device between differential output end and an earth point.
16. amplifier circuit in parallel as claimed in claim 10; it is characterized in that; described protective circuit more for when described output loading is for receiving and exporting described second amplified signal, reduces the amplitude of oscillation because being injected into the signal of described first supply voltage in the described signal to differential output end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN1541/MUM/2011 | 2011-05-20 | ||
| IN1541MU2011 | 2011-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102790934A CN102790934A (en) | 2012-11-21 |
| CN102790934B true CN102790934B (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210155299.9A Expired - Fee Related CN102790934B (en) | 2011-05-20 | 2012-05-18 | Amplifier circuit in parallel |
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| Country | Link |
|---|---|
| CN (1) | CN102790934B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001339506A (en) * | 2000-05-25 | 2001-12-07 | Sony Corp | Portable terminal |
| CN100391216C (en) * | 2004-01-05 | 2008-05-28 | 英华达（南京）科技有限公司 | Method for common sue of loudspeaker of personal hand-set bell and talk-listen |
| CN201733428U (en) * | 2010-05-17 | 2011-02-02 | 青岛海信移动通信技术股份有限公司 | Audio output circuit and mobile terminal with the same |
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2012
- 2012-05-18 CN CN201210155299.9A patent/CN102790934B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN102790934A (en) | 2012-11-21 |
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Granted publication date: 20150128 Termination date: 20200518 |