CN102195576A - Audio amplifier working in double modes - Google Patents
Audio amplifier working in double modes Download PDFInfo
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- CN102195576A CN102195576A CN2011100343281A CN201110034328A CN102195576A CN 102195576 A CN102195576 A CN 102195576A CN 2011100343281 A CN2011100343281 A CN 2011100343281A CN 201110034328 A CN201110034328 A CN 201110034328A CN 102195576 A CN102195576 A CN 102195576A
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- 230000003321 amplification Effects 0.000 abstract description 9
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- 230000005236 sound signal Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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Abstract
The invention provides an audio amplifier working in double modes. The audio amplifier comprises a left channel input buffer circuit, a left channel D/AB selecting circuit, a left channel driving circuit, a right channel D/AB selecting circuit, a right channel driving circuit, a mute and shutoff control circuit, a mode circuit and a bias voltage generating circuit, wherein the left channel input buffer circuit, the left channel D/AB selecting circuit and the left channel driving circuit are connected sequentially; the right channel D/AB selecting circuit and the right channel input buffer circuit are connected sequentially; the mute and shutoff control circuit is used for connecting the left channel input buffer circuit and the right channel input buffer circuit; the mode circuit is used for connecting the left channel D/AB selecting circuit and the right channel D/AB selecting circuit; and the bias voltage generating circuit is connected with all the circuits so as to regulate the voltages of all the circuits. In the invention, the output of different power amplification types can be selected according to practical application; and a monolithic integrated power amplification circuit realizes an AB power amplification type or D power amplification type, therefore, the application cost is reduced.
Description
Technical field
The present invention relates to the audio frequency amplifier in the electronic system, particularly a kind of double mode work audio frequency amplifier.
Background technology
The current audio amplifier adopts AB class simple in structure to amplify as power amplifier mostly, and in order to improve the service efficiency of battery as far as possible, the part audio frequency amplifier adopts the D class to amplify as power amplifier.
The D class A amplifier A adopts pulse-width modulation (PWM) mode that input signal is carried out unscented transformation, the amplitude of the pulsewidth of the digital signal that conversion produced and corresponding sampled point signal is by certain relationship change, come the driving power switching transistor with this digital signal again, make it to produce variable pulse width digital signal, then the analog signal after filter restores power amplification with power output.In the process of conversion, need to adopt to be higher than a lot of high-frequency signal of audio signal, in the portion of energy of the remaining high-frequency signal of output meeting, cause interference like this system.
Summary of the invention
Low in order to overcome AB class power amplification efficiency, the easy EVAC (Evacuation Network Computer Model) of D class power amplifier particularly is with the wireless application of FM, the object of the present invention is to provide and a kind ofly can select the audio frequency amplifier of D quasi-mode or AB quasi-mode output, make and to take into account D class power amplifier high efficiency and the glitch-free characteristics of AB class power amplifier in the system applies at same output.
The technical solution used in the present invention is:
A kind of double mode work audio frequency amplifier comprises: the L channel input buffer circuit of Lian Jieing, L channel D/AB select circuit and L channel drive circuit successively; The R channel input buffer circuit of Lian Jieing, R channel D/AB select circuit and R channel drive circuit successively; Quiet with switch off control circuit, connect L channel input buffer circuit and R channel input buffer circuit; Mode circuit connects L channel D/AB and selects circuit and R channel D/AB to select circuit; And bias voltage generating circuit, be connected with above-mentioned each circuit, regulate the voltage of each circuit.
Described L channel input buffer circuit can only have an input, and described R channel input buffer circuit also can only have an input.
Described L channel input buffer circuit can have L channel in-phase input end and L channel inverting input, and described R channel input buffer circuit also can have R channel in-phase input end and R channel inverting input.
Described double mode work audio frequency amplifier also comprises thermal-shutdown circuit.
Described double mode work audio frequency amplifier also comprises current foldback circuit.
Described double mode work audio frequency amplifier comprises that also radio noise suppresses circuit.
Described double mode work audio frequency amplifier comprises that also Property of Blasting Noise suppresses circuit.
The invention has the beneficial effects as follows that system can select the output of different power amplifier types according to practical application, monolithic integrated amplifier circuit is realized AB class power amplifier or D class power amplifier, reduces application cost.
Below in conjunction with accompanying drawing the embodiment and advantages of the present invention are further explained.
Description of drawings
Fig. 1 is the integrated circuit block diagram according to the double mode work audio frequency amplifier of a kind of single-ended input of the present invention.
Fig. 2 is the laying out pattern of the double mode work audio frequency amplifier of single-ended input of the present invention shown in Figure 1.
Fig. 3 is the suitable encapsulation figure of the double mode work audio frequency amplifier of single-ended input of the present invention shown in Figure 2.
Fig. 4 is the integrated circuit block diagram according to the double mode work audio frequency amplifier of a kind of both-end input pattern of the present invention.
Fig. 5 is the laying out pattern of the double mode work audio frequency amplifier of single-ended input of the present invention shown in Figure 4.
Fig. 6 is the suitable encapsulation figure of the double mode work audio frequency amplifier of single-ended input of the present invention shown in Figure 5.
Fig. 7 is the application schematic diagram of audio frequency amplifier of the present invention.
Fig. 8 is the waveform schematic diagram that the present invention imports, exports.
Embodiment
The explanation of relevant embodiments of the invention is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.In following examples, in different figure, same section is to represent with same numeral.Fig. 1 to Fig. 3 shows the first embodiment of the present invention, and Fig. 4 to Fig. 6 shows the second embodiment of the present invention, and Fig. 7 shows the application of amplifier of the present invention, and Fig. 8 has illustrated input of the present invention and output waveform.
Embodiment 1
With reference to figure 1.A kind of according to an embodiment of the invention double mode work audio frequency amplifier comprises: the L channel input buffer circuit 11 of Lian Jieing, L channel D/AB select circuit 12 and L channel drive circuit 13 successively; The R channel input buffer circuit 21 of Lian Jieing, R channel D/AB select circuit 22 and R channel drive circuit 23 successively; Quiet with switch off control circuit 31, connect L channel input buffer circuit 11 and R channel input buffer circuit 21; Mode circuit 51 connects L channel D/AB and selects circuit 12 and R channel D/AB to select circuit 22; And bias voltage generating circuit 41, be connected with above-mentioned each circuit, regulate the voltage of each circuit.
Continuation is with reference to figure 1.In this embodiment, described L channel input buffer circuit only has an input 14, and described R channel input buffer circuit 21 also only has an input 24.Described double mode work audio frequency amplifier can also continue to comprise that thermal-shutdown circuit 61, current foldback circuit 62, radio noise suppress at least one in circuit 63 and the Property of Blasting Noise inhibition circuit 64.With regard to complete circuit, also comprise power input 71 and earth terminal 76, Power Groud (L channel) 72 and Power Groud (R channel) 75, power power-supply (L channel) 73 and power power-supply (R channel) 74.The first order input buffering phase that has in L channel input buffer circuit 11 and the R channel input buffer circuit 21 provides the high-pass filtering of audio signal.
Single-ended input signal is not subjected to the influence of other signal layout, the main path of considering to be input between the output, and Fig. 2 has provided optimum layout, according to layout, has set optimum DIP16, SSOP16 and SOP16 packaging pin figure, as shown in Figure 3.
Embodiment 2
With reference to figure 4, this figure shows the second embodiment of the present invention.Different with first embodiment is, the L channel input buffer circuit 11 of present embodiment has L channel in-phase input end 141 and L channel inverting input 142, and R channel input buffer circuit 21 also has R channel in-phase input end 241 and R channel inverting input 242.
The both-end input signal wishes can match each other, reduces the offset voltage of product, and Fig. 5 has provided optimum layout, according to layout, has set optimum DIP16, SSOP16 and SOP16 packaging pin figure, as shown in Figure 6.
As shown in Figure 7, when the present invention used, audio signal was through first order input buffer, and L channel input buffer circuit or R channel input buffer circuit are connected to D/AB and select module to be input to driver module at last after the isolation, finally export to audio amplifier.The purpose that adds first order input buffer is: a partiting dc capacitor C1 is generally all used in the audio frequency input, first order input buffer has input resistance R1, audio signal is formed high pass filter through R1, C1 the signal that is higher than the audiorange frequency is decayed, and makes AB class power amplifier logical identical with the band of D class power amplifier.After D/AB selection module,, set different paths and different power according to D class power amplifier, the different characteristics of AB class power amplifier.The path of D class or AB class can also can drive output by two respectively as shown in the figure finally via same driving output.In other embodiments of the invention, L channel input and R channel input also can unite two into one, and the output driving can be one or more, and in other words, input and output all can be for one or more.
Figure 8 shows that the waveform schematic diagram that the present invention imports, exports, under identical chip anode input signal and identical chip negative terminal input signal, adopt the signal of AB pattern and D pattern output respectively.Output waveform only is that signal amplitude becomes greatly with the input waveform under the AB pattern; Be output as modulation signal under the D pattern, be high frequency square wave, send the source of sound that people's ear can be discerned through loudspeaker by inductance, the electric capacity modulation of loudspeaker.
Audio frequency amplifier selectively operating provided by the invention is at the framework of amplification of D class or AB class amplification mode, comprising the main gain of input audio signal by the preamplifier control system, enter the second level amplifier that the amplification of AB class is amplified or entered to the D class by the mode of operation signal deciding then, at last by same power tube output D class or AB class audio signal.Utilize circuit implementation efficiency simple in structure with jamproof perfect adaptation.
The present invention adopts CMOS technology, and the advantage of the advantage of integrated D class power amplifier and AB class power amplifier realizes the jamproof perfect adaptation of high efficiency homologous ray.
Certainly, more than only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.In addition to the implementation, the present invention can also have other execution mode.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the present invention's scope required for protection.
Claims (7)
1. a double mode work audio frequency amplifier is characterized in that, comprises:
The L channel input buffer circuit of Lian Jieing, L channel D/AB select circuit and L channel drive circuit successively;
The R channel input buffer circuit of Lian Jieing, R channel D/AB select circuit and R channel drive circuit successively;
Quiet with switch off control circuit, connect L channel input buffer circuit and R channel input buffer circuit;
Mode circuit connects L channel D/AB and selects circuit and R channel D/AB to select circuit; And
Bias voltage generating circuit is connected with above-mentioned each circuit, regulates the voltage of each circuit.
2. double mode work audio frequency amplifier according to claim 1 is characterized in that described L channel input buffer circuit only has an input, and described R channel input buffer circuit also only has an input.
3. double mode work audio frequency amplifier according to claim 1, it is characterized in that, described L channel input buffer circuit has L channel in-phase input end and L channel inverting input, and described R channel input buffer circuit has R channel in-phase input end and R channel inverting input.
4. according to each described double mode work audio frequency amplifier in the claim 1,2,3, it is characterized in that described double mode work audio frequency amplifier also comprises thermal-shutdown circuit.
5. according to each described double mode work audio frequency amplifier in the claim 1,2,3, it is characterized in that described double mode work audio frequency amplifier also comprises current foldback circuit.
6. according to each described double mode work audio frequency amplifier in the claim 1,2,3, it is characterized in that described double mode work audio frequency amplifier comprises that also radio noise suppresses circuit.
7. according to each described double mode work audio frequency amplifier in the claim 1,2,3, it is characterized in that described double mode work audio frequency amplifier comprises that also Property of Blasting Noise suppresses circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100343281A CN102195576A (en) | 2011-02-01 | 2011-02-01 | Audio amplifier working in double modes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100343281A CN102195576A (en) | 2011-02-01 | 2011-02-01 | Audio amplifier working in double modes |
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| CN102195576A true CN102195576A (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100343281A Pending CN102195576A (en) | 2011-02-01 | 2011-02-01 | Audio amplifier working in double modes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270106A (en) * | 2014-09-16 | 2015-01-07 | 广州杰士莱电子有限公司 | Power amplifier circuit |
| CN104639070A (en) * | 2013-11-14 | 2015-05-20 | 展讯通信（上海）有限公司 | Integrated circuit and user terminal |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101002380A (en) * | 2004-08-12 | 2007-07-18 | 皇家飞利浦电子股份有限公司 | Dual mode audio amplifier |
| CN101202593A (en) * | 2006-11-30 | 2008-06-18 | 美国博通公司 | Method and system for processing multi-rate audio from a plurality of audio processing sources |
| CN101771386A (en) * | 2008-12-30 | 2010-07-07 | 龙鼎微电子(上海)有限公司 | Class D audio power amplifier with anti-saturation distortion circuit |
-
2011
- 2011-02-01 CN CN2011100343281A patent/CN102195576A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101002380A (en) * | 2004-08-12 | 2007-07-18 | 皇家飞利浦电子股份有限公司 | Dual mode audio amplifier |
| CN101202593A (en) * | 2006-11-30 | 2008-06-18 | 美国博通公司 | Method and system for processing multi-rate audio from a plurality of audio processing sources |
| CN101771386A (en) * | 2008-12-30 | 2010-07-07 | 龙鼎微电子(上海)有限公司 | Class D audio power amplifier with anti-saturation distortion circuit |
Non-Patent Citations (1)
| Title |
|---|
| 赵东凯: "基于D类音频放大器MAX9736A/B的MP3播放器的设计", 《电子设计工程》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104639070A (en) * | 2013-11-14 | 2015-05-20 | 展讯通信（上海）有限公司 | Integrated circuit and user terminal |
| CN104639070B (en) * | 2013-11-14 | 2017-08-25 | 展讯通信（上海）有限公司 | Integrated circuit and user terminal |
| CN104270106A (en) * | 2014-09-16 | 2015-01-07 | 广州杰士莱电子有限公司 | Power amplifier circuit |
| CN104270106B (en) * | 2014-09-16 | 2017-09-26 | 广州杰士莱电子有限公司 | Power amplifier |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
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Application publication date: 20110921 |