CN1251412C - Dynamic matching method for folded interpolating A/D converter - Google Patents
Dynamic matching method for folded interpolating A/D converter Download PDFInfo
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- CN1251412C CN1251412C CN 02132018 CN02132018A CN1251412C CN 1251412 C CN1251412 C CN 1251412C CN 02132018 CN02132018 CN 02132018 CN 02132018 A CN02132018 A CN 02132018A CN 1251412 C CN1251412 C CN 1251412C
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Abstract
The present invention provides a dynamic matching method for a folding interpolation A/D converter. The present invention comprises the following steps: 1 mimic input signals pass through a preceding stage track hold circuit to obtain holding signals; 2 the holding signals are input to be coupled in preset non-inverting input terminal or inverted input terminal of a fold circuit, reference voltage signals output by reference voltage resistor strings are coupled in the preset inverted input terminal or the non-inverting input terminal, and output signals of a folding interpolation circuit are maintained by a post stage track hold circuit; 3 the hold signals are input by the gating of a switching network to be coupled in the preset inverting input or the non-inverting input terminal of the folding circuit, and the reference voltage signals output by the reference voltage resistor strings are coupled in the preset non-inverting input terminal or the inverting input terminal; 4 signals are output by the folding interpolation circuit; 5 the output signals and the holding signals output by the post stage track hold circuit are coupled in fine quantizing comparator array to obtain cyclic codes.
Description
Technical field
The invention provides a kind of dynamic matching method of analog to digital converter, be meant a kind of dynamic matching method that is used for folded interpolating A/D converter especially.
Background technology
Folded interpolating A/D converter (as shown in Figure 1) is the two step structures that walk abreast.Input signal is through the prime track and hold circuit signal that is maintained, and be divided into two-way: the one tunnel through the folded interpolating processing of circuit, produces somely to differential signal, quantizes the zero crossing that comparator array detects every pair of differential signal through essence again, generates cyclic code; Simultaneously, inhibit signal generates thermometer-code through the thick comparator array that quantizes; Thermometer-code and cyclic code are through decoding and the last digital code of digital correction logic (that is synchronization control circuit) output.
Above-mentioned folding electric circuit as shown in Figure 2.Through the inhibit signal of above-mentioned prime track and hold circuit output, Shu De is put Mei in-phase input end (perhaps, inverting input) that is put in the array in the access; A series of reference voltage signals of reference voltage resistance string output, the inverting input that Jie Ru is put (perhaps, in-phase input end); The output that is put is through the folding folded signal that produces.As shown in Figure 2, folded signal is a differential signal, and its zero crossing Dui Ying is put each reference voltage level of access.
The principle of above-mentioned interpolation circuit as shown in Figure 3.Above-mentioned folded signal drives interpolation circuit, the output interpolated signal.Solid line is represented folded signal among Fig. 3, and dotted line is represented interpolated signal.Interpolated signal also is a differential signal, and its zero crossing is corresponding to the reference voltage level that is omitted.
The differential signal (comprising above-mentioned folded signal and above-mentioned interpolated signal) of above-mentioned folded interpolating circuit output inserts two inputs that above-mentioned essence quantizes comparator; Above-mentioned essence quantizes the above-mentioned cyclic code of comparator array output, and the above-mentioned thermometer-code of exporting with above-mentioned thick quantification comparator array is input to above-mentioned decoding and digital correction logic, obtains above-mentioned digital code output.
The precision of folded interpolating A/D converter depends on the precision of differential signal zero crossing.Influencing the zero crossing accuracy factors has:the nonlinearity erron of (1) reference voltage; (2) fold the input imbalance that Dian Lu is put; (the mismatch that 3) are put tail current source; (4) folded signal is non-linear; (5) smart quiet, the dynamic imbalance that quantizes comparator.Wherein, (1) can guarantee that its nonlinearity erron is in allowed band by the design of reference voltage resistance string; (3) be to adopt the current source of high output impedance or use the current source technology that adopts in the digital to analog converter, choose the folding electric circuit of less folding ratio simultaneously; (4) can take interpolation circuit with two times of interpolation rates of folded signal linear independence, perhaps adopt improved interpolation circuit; (5) then be to guarantee that by folding gain the imbalance of comparator is in allowed band.And the imbalance that (2) folding Dian Lu is put is never effectively solved.It has become " bottleneck " that folded interpolation structure is applied to the high-resolution analog to digital converter, and problem is more outstanding when especially adopting CMOS technology to make.
In order to solve this " bottleneck " problem, the benevolent see benevolence and the wise see wisdom.Methods such as automatic zero set, background imbalance adjustment and averaging are emerged in large numbers one after another.
The automatic zero set technology is that is put the input short circuit, stores the offset voltage of output with electric capacity.When is put input signal, the offset voltage that stores on the electric capacity Yu the offset voltage that is put offset.But because the switch that integrated technique is made exists leakage current to cause capacitor discharge, automatic zero set must be carried out once the compartment time, and capacitance voltage is bigger required stabilization time, and the clock cost is big, is unfavorable for high-speed transitions; In addition, Mei put all will have booster amplifier to be used for imbalance storage capacitance and signal path are isolated, and has increased the system power expense.
Background imbalance adjustment technology is to adopt over-sampling (delta-sigma) modulator and calibration digital to analog converter to measure and adjust the zero crossing of folded signal.It needs to carry out in conjunction with fragmentation technique and pipeline mode, and circuit realizes that complexity and area and power consumption are very big.
Averaging is the technology that imbalance is put in more solution in advance of using at present.It is adjacent De to be put output link to each other by resistance, if the range of linearity that has N to put is overlapping and lack of proper care uncorrelatedly, the zero crossing precision of output signal will improveDoubly.It to the imbalance effect inhibition be limited and efficient not high.In addition, it has many negative effects, as has reduced the amplification gain, is unfavorable for the inhibition to the comparator imbalance effect.
Summary of the invention
The object of the present invention is to provide a kind of dynamic matching method that is used for folded interpolating A/D converter, it can thoroughly solve folding Dian Lu and put imbalance.
A kind of dynamic matching method that is used for folded interpolating A/D converter of the present invention is characterized in that, comprises the steps:
(1), analog input signal is through the prime track and hold circuit signal that is maintained;
(2), the inhibit signal of prime track and hold circuit inserts the input that folded interpolating Dian Lu is put, another input that the reference voltage signal Jie Ru of reference voltage resistance string output is put, the output signal of folded interpolating circuit is kept by back level track and hold circuit;
(3), by the switching network gating, the reference voltage signal of the inhibit signal of prime track and hold circuit and reference voltage resistance string output is exchanged and is inserted two inputs that folded interpolating Dian Lu is put;
(4), folded interpolating circuit output signal;
(5), above-mentioned output signal inserts the smart comparator array that quantizes with the inhibit signal of back level track and hold circuit output, obtains cyclic code.
Wherein the folded interpolating circuit is difference work, and its a series of inputs and output are paired.
Description of drawings
Fig. 1 is the structured flowchart of the folded interpolating A/D converter of prior art;
Fig. 2 is the structural representation of the folding electric circuit of prior art;
Fig. 3 is the principle schematic of the interpolation circuit of prior art;
Fig. 4 is the structured flowchart of the folded interpolating A/D converter of employing dynamic matching method of the present invention;
Fig. 5 is the workflow diagram of the folded interpolating A/D converter of employing dynamic matching method of the present invention;
Fig. 6 is a structured flowchart that adopts 8 folded interpolating A/D converters of dynamic matching method of the present invention.
Embodiment
See also shown in Figure 5ly, a kind of dynamic matching method that is used for folded interpolating A/D converter of the present invention comprises the steps:
(1), analog input signal is through the prime track and hold circuit signal that is maintained;
(2), the inhibit signal of prime track and hold circuit inserts the input that folded interpolating Dian Lu is put, another input that the reference voltage signal Jie Ru of reference voltage resistance string output is put, the output signal of folded interpolating circuit is kept by back level track and hold circuit;
(3), by the switching network gating, the reference voltage signal of the inhibit signal of prime track and hold circuit and reference voltage resistance string output is exchanged and is inserted two inputs that folded interpolating Dian Lu is put;
(4), folded interpolating circuit output signal;
(5), above-mentioned output signal inserts the smart comparator array that quantizes with the inhibit signal of back level track and hold circuit output, obtains cyclic code.
Wherein the folded interpolating circuit is difference work, and its a series of inputs and output all are paired.
Wherein insert the smart signal that quantizes comparator input terminal and be output output of folded interpolating circuit in the step (2) and the signal that the above-mentioned same output of folded interpolating circuit is exported in signal that back level track and hold circuit keeps and step (3).
The present invention is a kind of method that is applied to folded interpolating A/D converter.This folded interpolating A/D converter converts analog input signal to the digital code output of one sequence; The digital code of each output has been represented the sampled value of an analog input signal.This folded interpolating A/D converter comprises the prime track and hold circuit, the folded interpolating circuit, and the smart comparator array that quantizes slightly quantizes comparator array and decoding and digital correction logic.Analog input signal is through the prime track and hold circuit signal that is maintained, and be divided into two-way: the one tunnel through the folded interpolating processing of circuit, produces somely to differential signal, quantizes the zero crossing that comparator array detects every pair of differential signal through essence again, generates cyclic code; Simultaneously, inhibit signal generates thermometer-code through the thick comparator array that quantizes; Thermometer-code and cyclic code are through decoding and digital correction logic (that is synchronization control circuit) output digital code.
This method is to add switching network and back level track and hold circuit in above-mentioned folded interpolating A/D converter, as shown in Figure 4.After switching network is positioned at the prime track and hold circuit, before the folded interpolating circuit; After a level track and hold circuit in back is positioned at the folded interpolating circuit, smart quantize comparator array before.Analog input signal is through the prime track and hold circuit signal that is maintained.During keeping, input signal is divided into two stages:the phase I, the in-phase input end that the folding Dian Lu of input inhibit signal access is put (perhaps, inverting input), the inverting input that the reference voltage signal Jie Ru of reference voltage resistance string output is put (perhaps, in-phase input end), the output signal of folded interpolating circuit is kept by back level track and hold circuit; Second stage, by the switching network gating, the inverting input that the folding Dian Lu of input inhibit signal access is put is (perhaps, in-phase input end), the in-phase input end (perhaps, inverting input) that the reference voltage signal Jie Ru of reference voltage resistance string output is put, the folded interpolating circuit output signal.This output signal inserts the smart comparator array that quantizes with the inhibit signal of back level track and hold circuit output, obtains cyclic code.What specify is, the folded interpolating circuit is difference work, and its a series of outputs also are paired in-phase output end and reversed-phase outputs.Insert the smart signal that quantizes comparator input terminal and be the phase I (perhaps from folded interpolating circuit in-phase output end, reversed-phase output) signal exported from folded interpolating circuit in-phase output end (perhaps, reversed-phase output) of output and the signal that keeps through back level track and hold circuit and second stage.
Advantage of the present invention is:
The present invention adopts the Dynamic Matching technology thoroughly to solve folding Dian Lu to put imbalance, guarantee to fold The linear precision of interpolating A/D converter reaches high-resolution requirement. Circuit structure is simple, and continues Compactness, the high speed advantage of folded interpolation structure have been held. Prior, it is suitable for standard digital CMOS Technology. In the trend of current large scale system single-chip integrated (System On Chip), This kind new structure will have original advantage.
Figure 6 shows that this patent method is applied to 8 folding inserting of 0.6 a μ mCMOS technology The example of value analog-digital converter. Wherein, the folded interpolating circuit adopts the two-stage cascade foldable structure, and is every After adopting 3 times of folding rates also, the folding circuit of level connects the interpolation circuit of 2 times of interpolation rates, the folding electricity of cascade Lu Houzai connects the interpolation circuit of 2 times of interpolation rates, obtains the difference letter of 32 pairs of 9 times of folding rates Number; The thick thermometer-code that quantizes comparator output quantizes the control signal of comparator array output through essence Carry out Synchronization Control, be equivalent to above-mentioned digital correction logic, then the thermometer through proofreading and correct synchronously Code and circulation code are input to digital decoder and buffer, produce last numeral code output.
The work principle: input simulation signal is followed the tracks of holding circuit through prime and is obtained importing inhibit signal, Be divided into two-way, the one tunnel sends into thick quantification comparator to produce thermometer-code, and the switch net is sent on another road Network and subsequent conditioning circuit thereof are to produce the circulation code. The circulation code produces by above-mentioned method. Switch net wherein The cycle of network control impuls and rear level are followed the tracks of the cycle of holding circuit control impuls, follow the tracks of with prime and protect The signal retention time of holding circuit is consistent.
Claims (2)
1, a kind of dynamic matching method that is used for folded interpolating A/D converter is characterized in that, comprises the steps:
(1), analog input signal is through the prime track and hold circuit signal that is maintained;
(2), the inhibit signal of prime track and hold circuit inserts the input that the folded interpolating circuit is put in advance, the reference voltage signal of reference voltage resistance string output inserts another input of putting in advance, and the output signal of folded interpolating circuit is kept by back level track and hold circuit;
(3), by the switching network gating, the reference voltage signal of the inhibit signal of prime track and hold circuit and reference voltage resistance string output is exchanged and is inserted two inputs that the folded interpolating circuit is put in advance;
(4), folded interpolating circuit output signal;
(5), above-mentioned output signal inserts the smart comparator array that quantizes with the inhibit signal of back level track and hold circuit output, obtains cyclic code.
2, the dynamic matching method that is used for folded interpolating A/D converter according to claim 1 is characterized in that, wherein the folded interpolating circuit is difference work, and its a series of inputs and output are paired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02132018 CN1251412C (en) | 2002-09-06 | 2002-09-06 | Dynamic matching method for folded interpolating A/D converter |
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| CN 02132018 CN1251412C (en) | 2002-09-06 | 2002-09-06 | Dynamic matching method for folded interpolating A/D converter |
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| CN1251412C true CN1251412C (en) | 2006-04-12 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047386B (en) * | 2007-03-15 | 2010-05-19 | 复旦大学 | 6-bit 600 MHz sample frequency folding interpolation A/D converter |
| CN101277114B (en) * | 2007-03-30 | 2010-06-09 | 无锡华芯美科技有限公司 | Design method for interpolation circuit in high speed analog-digit conversion and interpolation circuit |
| CN101499802B (en) * | 2008-02-03 | 2014-04-23 | 深圳艾科创新微电子有限公司 | Improved ADC in stacking structure |
| CN101783682B (en) * | 2009-01-16 | 2014-09-24 | 深圳艾科创新微电子有限公司 | Foldable structure ADC and error correction method thereof |
| CN102006072B (en) * | 2010-11-24 | 2012-06-13 | 复旦大学 | Low-voltage and low-consumption folding and interpolating analog/digital (A/D) converter adopting grouping type T/H switch |
| CN106656184B (en) * | 2016-12-26 | 2020-05-19 | 中国科学院微电子研究所 | Folding interpolation type analog-digital converter with folding rate of 3 and error correction method thereof |
| CN112217516B (en) * | 2020-08-31 | 2023-08-11 | 西安电子科技大学 | Time domain unipolar double folding circuit and time domain ADC |
| CN112350726A (en) * | 2020-10-30 | 2021-02-09 | 重庆睿歌微电子有限公司 | Interpolation system and method based on second-order tracking loop |
| CN112653469B (en) * | 2020-12-16 | 2023-08-01 | 东南大学 | Hybrid SAR-ADC circuit and analog-to-digital conversion method |
| CN112564707B (en) * | 2021-02-22 | 2021-05-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Clock jitter estimation and correction method for data acquisition in rotating environment |
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