CN101741388A - Oversampling analog-to-digital converter - Google Patents
Oversampling analog-to-digital converter Download PDFInfo
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- CN101741388A CN101741388A CN 200910260801 CN200910260801A CN101741388A CN 101741388 A CN101741388 A CN 101741388A CN 200910260801 CN200910260801 CN 200910260801 CN 200910260801 A CN200910260801 A CN 200910260801A CN 101741388 A CN101741388 A CN 101741388A
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- 238000007493 shaping process Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000013139 quantization Methods 0.000 abstract 1
- 239000000654 additive Substances 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 8
- 230000003321 amplification Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
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Abstract
The invention relates to an oversampling analog-to-digital converter, which comprises a second gain unit, a first adder, a first integrator, a third gain unit, a second adder, a second integrator, a fourth gain unit, a third adder, a third integrator, a fifth gain unit, a fourth adder, a fourth integrator and a fifth adder which are connected in turn; the input end of the second gain unit is connected to the second adder through a first gain unit; the output end of the fifth adder is respectively connected to the first adder, a second adder, a third adder and a fourth adder through a feedback gain unit; and the fifth adder also receives externally input quantization noise. By adopting a principle of oversampling noise shaping, the oversampling analog-to-digital converter meets the requirements of low noise and high precision; and simultaneously, the oversampling analog-to-digital converter adopts a low energy consumption operational amplifier, so that the oversampling analog-to-digital converter has the characteristics of low energy consumption and high precision simultaneously.
Description
Technical field
The present invention relates to a kind of oversampling analog-to-digital converter.
Background technology
In now a lot of System on Chip/SoCs or the interface chip system, need a lot of interface circuits, especially after extraneous analog signal is come in, convert digital signal to, therefore, all there is analog to digital converter in present nearly all System on Chip/SoC or the interface chip, becomes the purpose of digital signal to realize analog signal conversion.
Nowadays, along with the requirement to energy saving of system and low-power consumption, analog to digital converter is also required low-power consumption, high accuracy, this is to realize that whole system is low in energy consumption, the operating time is grown, the purpose of comparison environment-friendly high-efficiency.The transducer of realizing the analog and digital signal conversion at present is a lot, more common have flow-line modulus converter, the analog to digital converter that approaches one by one, an oversampling analog-to-digital converter, because flow-line modulus converter is useful in the high relatively occasion of speed high accuracy, it is not very high occasion that gradually-appoximant analog-digital converter is useful in the slow precision of speed, and the suitable speed ratio of oversampling analog-to-digital converter is very fast, therefore the occasion that precision is very high is used in System on Chip/SoC or interface chip system widely.
Yet, at present analog to digital converter is realized that low-power consumption is difficult, because low in energy consumption, be difficult to reach the requirement of precision height, good linearity.Oversampling analog-to-digital converter particularly, in the prior art, the high accuracy oversampling analog-to-digital converter is generally all realized by the many circulations of high-order at present, and the converter structure complexity of this employing mode realizes difficulty; In addition, elementary cell in above-mentioned this oversampling analog-to-digital converter is exactly an integrator, and this class integrator is made of operational amplifier and electric capacity, switch, wherein the structural representation of operational amplifier as shown in Figure 1, it comprises that interconnective transistor M1 ' is to M12 ', the power consumption of this type of operational amplifier is generally all bigger, because if power consumption is smaller, then there are problems such as the ratio of gains is less, imbalance is big, poor linearity in operational amplifier; And in fact, switch in the integrator and electric capacity do not consume power consumption basically, and have only operational amplifier need consume power consumption; In addition, owing to be over-sampling, general, the operating frequency of analog to digital converter in view of the above problems, makes oversampling analog-to-digital converter guaranteeing on the high-precision basis all than higher, realizes that low-power consumption is just more difficult.
Summary of the invention
In order to address the above problem, the present invention aims to provide a kind of novel oversampling analog-to-digital converter, realize the high-precision while to reach, reduce the power consumption of its internal integral device, thereby realize the purpose of whole oversampling analog-to-digital converter low-power consumption at the high-order oversampling analog-to-digital converter.
A kind of oversampling analog-to-digital converter of the present invention, it comprises second gain unit that connects successively, first adder, first integrator, the 3rd gain unit, second adder, the second integral device, the 4th gain unit, the 3rd adder, the third integral device, the 5th gain unit, the 4th adder, the 4th integrator and slender acanthopanax musical instruments used in a Buddhist or Taoist mass, and the input of described second gain unit is connected to described second adder by one first gain unit, the output of described slender acanthopanax musical instruments used in a Buddhist or Taoist mass is connected to described first adder by a feedback gain unit respectively, second adder, the 3rd adder and the 4th adder, described slender acanthopanax musical instruments used in a Buddhist or Taoist mass also receive the quantizing noise of an outside input.
In above-mentioned oversampling analog-to-digital converter, described first integrator to the four integrators comprise an operational amplifier respectively, and this operational amplifier comprise an electric capacity and be connected and an external power source between, first to fourth transistor that is connected in series successively
One end of described electric capacity is connected with described the 4th transistor, receives external input signal, and its other end is connected with described the first transistor, receives the first outside biasing voltage signal;
Described transistor seconds and the 3rd transistor are accepted outside second biasing voltage signal and the 3rd biasing voltage signal respectively, and output one amplifying signal between this transistor seconds and the 3rd transistor.
In above-mentioned oversampling analog-to-digital converter, the grid of described the first transistor receives described first biasing voltage signal, its source ground, and its drain electrode is connected with the source electrode of described transistor seconds; The grid of described transistor seconds receives described second biasing voltage signal, and its drain electrode is connected with described the 3rd transistor drain; The described the 3rd transistorized grid receives described the 3rd biasing voltage signal, and its source electrode is connected with described the 4th transistor drain; The described the 4th transistorized grid receives described external input signal, and its source electrode is connected with described external power source.
In above-mentioned oversampling analog-to-digital converter, the feedback gain of described four feedback gain unit is all inequality.
Owing to adopted above-mentioned technical solution, the present invention has adopted the mode of single cycle high-order noise shaping to reach the requirement that A/D converter noise is low, precision is high, owing to adopt single cycle to realize, therefore analog to digital converter is relatively simple for structure, adopt 1 quantification simultaneously, make that the linear degree of converter is good.In addition, adopt the mode that single tube amplifies that is equivalent to by operational amplifier to some integrators inside in the analog to digital converter, this single tube amplifier is equivalent to be operated in switch working state simultaneously, make operational amplifier work in only need smaller power consumption, and idle the time, need power consumption hardly, thereby the power consumption of whole oversampling analog-to-digital converter is also declined to a great extent.
Description of drawings
Fig. 1 is the structural representation of operational amplifier in the prior art;
Fig. 2 is the structural representation of a kind of oversampling analog-to-digital converter of the present invention;
Fig. 3 is the structural representation of the operational amplifier of integrator inside in the oversampling analog-to-digital converter of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
As shown in Figure 2, the present invention, it is a kind of oversampling analog-to-digital converter, it comprises the second gain unit G2 that connects successively, first adder 1, first integrator H1, the 3rd gain unit G3, second adder 2, second integral device H2, the 4th gain unit G4, the 3rd adder 3, third integral device H3, the 5th gain unit G5, the 4th adder 4, the 4th integrator H4 and slender acanthopanax musical instruments used in a Buddhist or Taoist mass 5, and the input of the second gain unit G2 is connected to second adder 2 by one first gain unit G1, the output of slender acanthopanax musical instruments used in a Buddhist or Taoist mass 5 is connected to first adder 1 by a feedback gain unit Gf respectively, second adder 2, the 3rd adder 3 and the 4th adder 4, the slender acanthopanax musical instruments used in a Buddhist or Taoist mass 5 also receive the quantizing noise of an outside input.
The concrete course of work of the present invention is:
First integrator H1 carries out shaping to first additive signal that receives, and exports first reshaping signal;
Second integral device H2 carries out shaping to second additive signal that receives, and exports second reshaping signal;
The 3rd adder 3 receives second reshaping signal that amplifies through the 4th gain unit G4 and through the digital signal of feedback gain unit Gf feedback, and after it was carried out add operation, H3 exported the 3rd additive signal to the third integral device;
Third integral device H3 carries out shaping to the 3rd additive signal that receives, and exports the 3rd reshaping signal;
The 4th adder 4 receives the 3rd reshaping signal that amplifies through the 5th gain unit G5 and through the digital signal of feedback gain unit Gf feedback, and after it is carried out add operation, exports the 4th additive signal to the 4th integrator H4;
The 4th integrator H4 carries out shaping to the 4th additive signal that receives, and exports the 4th reshaping signal;
Slender acanthopanax musical instruments used in a Buddhist or Taoist mass 5 receives the quantizing noise of the 4th reshaping signal and outside input, and the output digital signal.
Among the present invention, the feedback gain of four feedback gain unit Gf is all inequality, and first to the 4th is respectively Gf1 to Gf4; So far, the present invention has realized the low noise of analog to digital converter, high-precision requirement by adopting single cycle quadravalence over-sampling noise shaping system.
As shown in Figure 3, among the present invention, first integrator H1 to the four integrator H4 comprise an operational amplifier respectively, and this operational amplifier comprises a capacitor C and the first to fourth transistor M1 to M4 that connects successively, wherein,
The grid of the first transistor M1 receives the first biasing voltage signal Bias1, its source ground, and its drain electrode is connected with the source electrode of transistor seconds M2;
The grid of transistor seconds M2 receives the second biasing voltage signal Bias2, and its drain electrode is connected with the drain electrode of the 3rd transistor M3, and output one amplifying signal between this transistor seconds M2 and the 3rd transistor M3;
The grid of the 3rd transistor M3 receives the 3rd biasing voltage signal Bias3, and its source electrode is connected with the drain electrode of the 4th transistor M4;
The grid of the 4th transistor M4 receives external input signal, and its source electrode is connected with external power source VDD;
One end of capacitor C is connected with the grid of the 4th transistor M4, and its other end is connected with the first transistor M1.
In above-mentioned operational amplifier, the first transistor M1 and the 4th transistor M4 are equivalent to the single tube amplifier, and transistor seconds M2 and the 3rd transistor M3 are the usefulness of gain amplification; The operational amplifier of integrator inside is operated on off state by making the single tube amplifier among the present invention, has reduced the power consumption of operational amplifier, thereby makes the power consumption of analog to digital converter of the present invention reach energy-conservation and requirement low-power consumption.
In sum, oversampling analog-to-digital converter of the present invention is as the interface chip that analog signal conversion is become digital signal relatively more commonly used in the present System on Chip/SoC, adopted the principle of over-sampling noise shaping, make input signal can reach the performance index requirement of System on Chip/SoC, realized the low noise of analog to digital converter, high-precision requirement this analog to digital converter through the noise shaping of analog to digital converter; The present invention has simultaneously adopted the operational amplifier that can reduce the analog to digital converter power consumption, so the two is in conjunction with making the present invention reach low-power consumption and high-precision requirement simultaneously.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (4)
1. oversampling analog-to-digital converter, it is characterized in that, described analog to digital converter comprises second gain unit that connects successively, first adder, first integrator, the 3rd gain unit, second adder, the second integral device, the 4th gain unit, the 3rd adder, the third integral device, the 5th gain unit, the 4th adder, the 4th integrator and slender acanthopanax musical instruments used in a Buddhist or Taoist mass, and the input of described second gain unit is connected to described second adder by one first gain unit, the output of described slender acanthopanax musical instruments used in a Buddhist or Taoist mass is connected to described first adder by a feedback gain unit respectively, second adder, the 3rd adder and the 4th adder, described slender acanthopanax musical instruments used in a Buddhist or Taoist mass also receive the quantizing noise of an outside input.
2. oversampling analog-to-digital converter according to claim 1, it is characterized in that, described first integrator to the four integrators comprise an operational amplifier respectively, and this operational amplifier comprise an electric capacity and be connected and an external power source between, first to fourth transistor that is connected in series successively
One end of described electric capacity is connected with described the 4th transistor, receives external input signal, and its other end is connected with described the first transistor, receives the first outside biasing voltage signal;
Described transistor seconds and the 3rd transistor are accepted outside second biasing voltage signal and the 3rd biasing voltage signal respectively, and output one amplifying signal between this transistor seconds and the 3rd transistor.
3. oversampling analog-to-digital converter according to claim 2 is characterized in that, the grid of described the first transistor receives described first biasing voltage signal, its source ground, and its drain electrode is connected with the source electrode of described transistor seconds; The grid of described transistor seconds receives described second biasing voltage signal, and its drain electrode is connected with described the 3rd transistor drain; The described the 3rd transistorized grid receives described the 3rd biasing voltage signal, and its source electrode is connected with described the 4th transistor drain; The described the 4th transistorized grid receives described external input signal, and its source electrode is connected with described external power source.
4. oversampling analog-to-digital converter according to claim 1 is characterized in that the feedback gain of described four feedback gain unit is all inequality.
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| CN 200910260801 CN101741388B (en) | 2009-12-09 | 2009-12-09 | Oversampling analog-to-digital converter |
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| CN 200910260801 CN101741388B (en) | 2009-12-09 | 2009-12-09 | Oversampling analog-to-digital converter |
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| CN101741388A true CN101741388A (en) | 2010-06-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075190A (en) * | 2011-01-17 | 2011-05-25 | 中国航天科技集团公司第九研究院第七七一研究所 | Analog-to-digital converter with adaptive sampling rate |
| CN107707259A (en) * | 2017-11-01 | 2018-02-16 | 兰州大学 | A kind of method of analog signal sampling and reconstruct |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6137826A (en) * | 1997-11-17 | 2000-10-24 | Ericsson Inc. | Dual-mode modulation systems and methods including oversampling of narrow bandwidth signals |
| CN100521546C (en) * | 2005-04-26 | 2009-07-29 | 曹先国 | Comparer and analog-to-digital converter |
| CN201550101U (en) * | 2009-12-09 | 2010-08-11 | 上海贝岭股份有限公司 | Over-sampling A/D converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075190A (en) * | 2011-01-17 | 2011-05-25 | 中国航天科技集团公司第九研究院第七七一研究所 | Analog-to-digital converter with adaptive sampling rate |
| CN102075190B (en) * | 2011-01-17 | 2013-06-19 | 中国航天科技集团公司第九研究院第七七一研究所 | Analog-to-digital converter with adaptive sampling rate |
| CN107707259A (en) * | 2017-11-01 | 2018-02-16 | 兰州大学 | A kind of method of analog signal sampling and reconstruct |
| CN107707259B (en) * | 2017-11-01 | 2020-11-03 | 兰州大学 | Method for sampling and reconstructing analog signal |
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