CN101895263A - Digital input class-d power amplifier circuit - Google Patents
Digital input class-d power amplifier circuit Download PDFInfo
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- CN101895263A CN101895263A CN 201010155253 CN201010155253A CN101895263A CN 101895263 A CN101895263 A CN 101895263A CN 201010155253 CN201010155253 CN 201010155253 CN 201010155253 A CN201010155253 A CN 201010155253A CN 101895263 A CN101895263 A CN 101895263A
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Abstract
The invention discloses a digital input class-D power amplifier circuit, relating to an electronic technology. The power amplifier circuit comprises an integrator, a comparator, an output stage and a filter, wherein the output end of the integrator is connected with the inverted input end of the comparator, the output end of the comparator is fed back to the input end of the integrator through the output stage, a digital control current source is arranged between the input end of the integrator and the input end of the system, the input end of the integrator is also connected with the output end of a clock input circuit, and the clock input circuit is provided with a clock signal input end; and the positive input end of the comparator is grounded. The power amplifier circuit does not comprise a square wave or toothed wave generating circuit, thereby ensuring more compact structure and lower implementation cost.
Description
Technical field
The present invention relates to electronic technology, particularly integrated circuit technique.
Background technology
The D power-like amplifier also claims PWM (pulse width modulation) amplifier, can be used for amplifying audio signal.The D power-like amplifier of prior art comprises integrator and comparator usually, and the sawtooth waveforms of the output of integrator and oscillator output or triangular wave are relatively exported the PWM ripple, as shown in Figure 1.The D class A amplifier A adopts the analog voltage signal input, is subject to noise jamming usually.
Summary of the invention
Technical problem to be solved by this invention is, a kind of overcome input noise, D class A amplifier A simple in structure are provided.
The technical scheme that the present invention solve the technical problem employing is, digital input class-D power amplifier circuit, comprise integrator, comparator, output stage, filter, the reverse input end of the output termination comparator of integrator, the output of comparator feeds back to the input of integrator by output stage, it is characterized in that, between the input of described integrator and the system input Numerical Controlled Current Source is arranged, the input of integrator also is connected with the output of clock input circuit, and clock input circuit is provided with clock signal input terminal; The positive input ground connection of comparator.
Described clock input circuit can adopt trsanscondutance amplifier, also can be a simple resistance.
The invention has the beneficial effects as follows, solved the input noise problem of prior art, its internal digital analog converter adopts current-mode output, is different from the voltage mode digital analog converter that adopts in the existing system scheme, and the analog voltage signal input of amplifier is directly received in output.The present invention adopts the numeral input, and is simpler when using, and do not need external digital to analog converter.Signal can not be affected when transmission yet.The inner current-mode that adopts.Current-mode comparison with voltage pattern, insensitive to interference of noise.The present invention does not comprise square wave or saw-tooth wave generating circuit, and structure is compact more, realizes that cost is also lower.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the circuit diagram of prior art.
Fig. 2 is a circuit diagram of the present invention.
Fig. 3 is the circuit diagram of digital control current source.
Embodiment
Referring to Fig. 2.
D power-like amplifier of the present invention has comprised digital control current source, integrator, comparator and output stage.Digital control current source is converted to electric current with the digital signal of importing and exports to integrator.The output of integration and a direct voltage compare output pwm signal.This pwm signal drives and filtering rear drive load through output.The D power-like amplifier that the present invention proposes comprises a feedback network from the pwm signal output to the integrator input.
Specifically, the D power-like amplifier comprises integrator 20, comparator 2, output stage 3, filter 4, the reverse input end of the output termination comparator 2 of integrator 20, the output of comparator 2 feeds back to the input of integrator 20 by output stage 3, Numerical Controlled Current Source 6 is arranged between the input of described integrator 20 and the system input, the input of integrator 20 also is connected with the output of clock input circuit, and clock input circuit is provided with clock signal input terminal; The positive input ground connection of comparator 2.
Described clock input circuit can adopt trsanscondutance amplifier, also can be a simple resistance.
More specifically, circuit is made of Numerical Controlled Current Source 6, integrator 20, comparator 2, output stage 3.The input of Numerical Controlled Current Source 6 is the input Din of system, and output is received the reverse input end of operational amplifier 1.Numerical Controlled Current Source 6 is generally the digital to analog converter of electric current output mode.Integrator 20 is made of operational amplifier 1 and electric capacity 8.The output and the reverse input end of electric capacity 8 concatenation operation amplifiers 1.The positive input of operational amplifier 1 connects DC level.The output of operational amplifier 1, i.e. the output of integrator 20 connects the input of comparator 2.Another input termination DC level of comparator 2.Comparator 2 output connect output stage 3.Output stage 3 is the switch output stage, comprises the drive circuit of switch output stage simultaneously.The output of output stage 3 is the output OUTPUT of power amplifier.Output OUTPUT is connected to the port of filter 4.Another port of filter 4 is connected to load 5.Load 5 is generally a basis and flows through the loudspeaker that himself electric current is sounded.
Amplifier circuit comprises a clock input circuit, clock is imported Cin insert integrator 20.This input circuit can be a trsanscondutance amplifier, also can be a simple resistance.Amplifier circuit of the present invention comprises a feedback network, the output of amplifier is fed back to the input of integrator.For example, resistance 9 connects the input of output OUTPUT and integrator 20.
Amplifier circuit of the present invention does not comprise square wave or saw-tooth wave generating circuit, does not comprise square wave or sawtooth signal in the circuit yet.The forward input of comparator 2 connects DC level.Digital input signals does not need to be converted to voltage signal.The present invention does not comprise preamplifier and avoids voltage signal to be interfered, because the present invention is not subject to the voltage signal that disturbs.Equally, also do not comprise resistance or trsanscondutance amplifier is converted to current signal with voltage signal.
Fig. 2 is a kind of single-ended specific implementation circuit, and the present invention also is applicable to the differential signal realization simultaneously.When difference realized, current source 6 adopted difference output to get final product.The digital to analog converter of electric current output form, natural is exactly that difference is exported, and adopts difference form, can not cause special difficulty to the design of current source 6.
Fig. 3 is a kind of embodiment of digital control current source, and current-mode output DAC can look and do digital control current source.Different numeral input Din (Din1, Din2 ... Dinn) electric current of the different sizes of corresponding output port Iout output.
Claims (2)
1. digital input class-D power amplifier circuit, comprise integrator (20), comparator (2), output stage (3), filter (4), the reverse input end of the output termination comparator (2) of integrator (20), the output of comparator (2) feeds back to the input of integrator (20) by output stage (3), it is characterized in that, Numerical Controlled Current Source (6) is arranged between the input of described integrator (20) and the system input, the input of integrator (20) also is connected with the output of clock input circuit, and clock input circuit is provided with clock signal input terminal; The positive input ground connection of comparator (2).
2. digital input class-D power amplifier circuit as claimed in claim 1 is characterized in that, described clock input circuit is resistance (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101552538A CN101895263B (en) | 2010-04-22 | 2010-04-22 | Digital input class-d power amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101552538A CN101895263B (en) | 2010-04-22 | 2010-04-22 | Digital input class-d power amplifier circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101895263A true CN101895263A (en) | 2010-11-24 |
| CN101895263B CN101895263B (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101552538A Expired - Fee Related CN101895263B (en) | 2010-04-22 | 2010-04-22 | Digital input class-d power amplifier circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835356A (en) * | 2019-04-18 | 2020-10-27 | 宁波飞芯电子科技有限公司 | Ramp generator, analog-to-digital converter and control method for generating ramp signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258393A (en) * | 1998-01-22 | 2000-06-28 | 皇家菲利浦电子有限公司 | PWM amplifier |
| CN1525639A (en) * | 2003-02-26 | 2004-09-01 | 李相前 | A low distortion Class D amplifier |
| CN1777022A (en) * | 2004-11-08 | 2006-05-24 | 三星电子株式会社 | Digital audio amplifier, an audio system including the same, and a method of amplifying an audio signal |
| US20070139109A1 (en) * | 2005-12-21 | 2007-06-21 | Jun Honda | Class d amplifier with start-up click noise elimination |
| CN201797488U (en) * | 2010-04-22 | 2011-04-13 | 成都成电硅海科技股份有限公司 | Novel digital input power amplifier |
-
2010
- 2010-04-22 CN CN2010101552538A patent/CN101895263B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258393A (en) * | 1998-01-22 | 2000-06-28 | 皇家菲利浦电子有限公司 | PWM amplifier |
| CN1525639A (en) * | 2003-02-26 | 2004-09-01 | 李相前 | A low distortion Class D amplifier |
| CN1777022A (en) * | 2004-11-08 | 2006-05-24 | 三星电子株式会社 | Digital audio amplifier, an audio system including the same, and a method of amplifying an audio signal |
| US20070139109A1 (en) * | 2005-12-21 | 2007-06-21 | Jun Honda | Class d amplifier with start-up click noise elimination |
| CN201797488U (en) * | 2010-04-22 | 2011-04-13 | 成都成电硅海科技股份有限公司 | Novel digital input power amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835356A (en) * | 2019-04-18 | 2020-10-27 | 宁波飞芯电子科技有限公司 | Ramp generator, analog-to-digital converter and control method for generating ramp signal |
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| Publication number | Publication date |
|---|---|
| CN101895263B (en) | 2012-09-19 |
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Effective date of registration: 20170401 Address after: 610000 Wenjiang City, Chengdu province Yongquan Town, 51 Village Patentee after: Sichuan Hao Hao Real Estate Development Co., Ltd. Address before: 610041 Sichuan, Chengdu hi tech Zone Tianfu Avenue, No. 801 Tianfu Software Park B District, building 5, floor, floor, building 6 Patentee before: Chengdu Chengdian Guihai Science & Technology Co., Ltd. |
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Effective date of registration: 20170913 Address after: China high tech Zone of Chengdu City, Sichuan province 610041 Road No. 99 building 6 floor 5 No. 501 Patentee after: Chengdu cloud Network Technology Co., Ltd. Address before: 610000 Wenjiang City, Chengdu province Yongquan Town, 51 Village Patentee before: Sichuan Hao Hao Real Estate Development Co., Ltd. |
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Granted publication date: 20120919 Termination date: 20180422 |
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