CN103634005B - A kind of method of quantizing noise randomization in analog-digital converter - Google Patents
A kind of method of quantizing noise randomization in analog-digital converter Download PDFInfo
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- CN103634005B CN103634005B CN201310677856.8A CN201310677856A CN103634005B CN 103634005 B CN103634005 B CN 103634005B CN 201310677856 A CN201310677856 A CN 201310677856A CN 103634005 B CN103634005 B CN 103634005B
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Abstract
The method that the present invention provides quantizing noise randomization in a kind of analog-digital converter, the method is the clock frequency f_ck2 for setting analog-digital converter, a dither signal generator is added in analog-digital converter, the dither signal frequency that dither signal generator is produced is determined by the clock frequency f_ck2 of the analog-digital converter, comparator, D/A converter module is arranged on the frequency multiplication f_ck1 higher locked with f_ck2, then comparator is sent into after dither signal is superimposed with the output signal of loop filter, the quantizing noise randomization for producing comparator, the frequency selection purposes of the dither signal are in the zero point for extracting digital filter transfer coefficient, the dither signal is extracted digital filter and filters.The output signal-to-noise ratio of analog-digital converter of the invention is not influenceed by dither signal, produces the mechanism of dither signal simple, is easily realized, the amplitude required precision to dither signal is not high, saves power consumption, size and the cost of dither signal generator.
Description
Technical field
The present invention relates to the technical field of analog-digital converter, quantizing noise randomization in a kind of analog-digital converter is referred in particular to
Method.
Background technology
In existing analog-digital converter, especially SIGMA-Delta（Sigma-Delta）Analog-digital converter, its function
Module typically all includes input summer, loop filter, comparator, feedback D/A converter module and FIR and extracts numeral filter
Ripple device, its general principle is to use high frequency over-sampling, using high-gain of the loop filter near the signal frequency range that need to be processed,
And the narrow-band frequency response of extraction digital filter completes high accuracy to reach using relatively coarse analog-to-digital conversion module
The purpose of analog-to-digital conversion.The input signal of this analog-digital converter is analog signal V (t), and output signal is then data signal d
(n).In actual converted, data signal d (n) of output can also carry the quantizing noise produced by comparator, the quantizing noise
The signal to noise ratio important of amplitude in required process signal bandwidth to analog-digital converter.In typical SIGMA-moral
In your tower analog-digital converter, if employing the loop of low order loop filter, the quantizing noise for causing comparator to produce is not inconsistent
White noise sound spectrum is closed, and has very strong relevance with the frequency spectrum of input signal V (t).Certain input signal V (t) intensity and
Under frequency spectrum, quantizing noise can produce larger spectrum component and amplitude in the signal frequency range for needing, by extracting digital filtering
After ripple, the quantizing noise of high frequency can be filtered out, but near input signal V (t) frequency range, quantizing noise has many amplitudes higher
Spike, this will necessarily reduce the output signal-to-noise ratio of analog-digital converter.
The common method for solving this problem at present is to add a dither signal generator in the inside of analog-digital converter,
Signal y (t) that the dither signal generator is produced is random signal, and its frequency spectrum is white noise, white noise random signal y (t)
The harmonic relationships for interrupting input signal and comparator output signal can be played, both relevances are substantially reduced so that quantization is made an uproar
Sound randomization.But, have the shortcomings that in this way very big, that is, shake letter strict to the requirement of the randomness of dither signal
Number must frequency and amplitude will height random, produce the required precision of the equipment of the dither signal high, can bring larger
Power consumption and cost.If height random requirement can not be reached, when input signal amplitude is smaller, quantizing noise still suffers from very big
Signal frequency range in spike, simultaneously as dither signal in itself also be a noise, dither signal can extract digital filtering
Exported in device, have certain influence for the output signal-to-noise ratio of whole analog-digital converter.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided it is a kind of it is reasonable in design it is reliable, can effectively make modulus
Quantizing noise randomization in converter, low to the amplitude required precision of dither signal and output signal-noise ratio is not received completely
The method of quantizing noise randomization in the analog-digital converter of dither signal influence.
To achieve the above object, technical scheme provided by the present invention is：Quantizing noise is random in a kind of analog-digital converter
The method of change, it is included：
The firstth, the system clock frequency f_ck2 of analog-to-digital conversion device is set, a dither signal is added in analog-digital converter
Generator, the dither signal frequency that the dither signal generator is produced is determined by the system clock frequency f_ck2 of the analog-digital converter
It is fixed, i.e. dither signal frequency f（t）=N*f_ck2, N are positive integer；
Secondth, the working frequency for extracting digital filter determines that this is taken out by the system clock frequency f_ck2 of analog-digital converter
The working frequency for taking digital filter is completely the same with dither signal frequency, and mutually follows；The comparator of loop, produces feedback
The D/A converter module of signal is then operated on the frequency multiplication f_ck1 higher locked with f_ck2, f_ck1=M*f_ck2,
M is a larger positive integer.
3rd, sent into after the dither signal with enough amplitudes and frequency component is superimposed with the output signal of loop filter
Comparator, the quantizing noise randomization for producing comparator；
4th, the frequency selection purposes of the dither signal in the zero point for extracting digital filter transfer coefficient, believe by the shake
Number being extracted digital filter filters.
After such scheme is employed, its great advantage is by adding new trembling inside analog-digital converter to the present invention
Dynamic signal generator, the frequency of the dither signal that the dither signal generator is produced and the system clock frequency of the analog-digital converter
Correlation, as system clock frequency determine the dither signal frequency of dither signal generator, are filtered by dither signal and loop
The output signal superposition of ripple device, is then fed into comparator, because the amplitude and frequency component of the dither signal are sufficiently large so that
The quantizing noise that comparator is produced can randomization, simultaneously as the frequency of described dither signal and extracting digital filter
The zero point of transmission coefficient is determined by the system clock frequency of whole analog-digital converter, both be completely matching and mutually with
With, it ensure that dither signal is forever all in the zero point for extracting digital filter, this makes dither signal pass through extraction number
After word wave filter, the dither signal is filtered out, and this causes that dither signal, regardless of amplitude size, extracts the defeated of digital filter
Go out signal all without dither signal, i.e., the output signal-to-noise ratio of whole analog-digital converter is not influenceed by dither signal, meanwhile, produce
The mechanism of raw dither signal is simple, easily realizes, and, dither signal generator not high to the amplitude required precision of dither signal
Compound action need not be done, therefore power consumption, size and the cost of dither signal generator can be saved.
Brief description of the drawings
Fig. 1 is analog-digital converter function block diagram of the invention.
Fig. 2 extracts digital filter transfer coefficient spectrum figure for of the invention.
Fig. 3 is dither signal spectrogram of the invention.
Fig. 4 is the spectrogram of main node signal of the invention.
Fig. 5 is dither signal time-domain diagram of the invention.
Specific embodiment
With reference to specific embodiment, the invention will be further described：
Referring to shown in accompanying drawing 1 to accompanying drawing 4, the method for quantizing noise randomization in the analog-digital converter described in the present embodiment,
It is included：
The firstth, the system clock frequency f_ck2 of analog-digital converter is set, a dither signal is added in analog-digital converter
Generator, the dither signal frequency that the dither signal generator is produced is determined by the system clock frequency f_ck2 of the analog-digital converter
It is fixed, i.e. dither signal frequency f（t）=N*f_ck2, N are positive integer；
Secondth, the working frequency for extracting digital filter determines that this is taken out by the system clock frequency f_ck2 of analog-digital converter
The working frequency for taking digital filter is completely the same with dither signal frequency, and mutually follows；The comparator of loop, produces feedback
The D/A converter module of signal is then operated on the frequency multiplication f_ck1 higher locked with f_ck2, f_ck1=M*f_ck2,
M is a larger positive integer；
3rd, sent into after the dither signal with enough amplitudes and frequency component is superimposed with the output signal of loop filter
Comparator, the quantizing noise randomization for producing comparator；
4th, the frequency selection purposes of the dither signal in the zero point for extracting digital filter transfer coefficient, believe by the shake
Number being extracted digital filter filters, and the output signal-to-noise ratio for whole analog-digital converter does not influence.
According to the method for quantizing noise randomization in above-mentioned analog-digital converter, the analog-digital converter quantizing noise randomization
Processing mode is：The input signal of the analog-digital converter is analog signal V (t), and analog signal V (t) passes sequentially through input addition
After device and low order loop filter, dither signal y (t) produced with dither signal generator in the output of loop filter is stacked
Plus, and in the lump in feeding comparator, comparator can produce quantizing noise, in the middle high-speed digital signal d1 of comparator output
N () includes input signal v (t), quantizing noise and dither signal y (t), and because dither signal y (t) has enough amplitudes
And frequency component, as the white noise dither signal commonly used with prior art, can effectively make the quantizing noise of analog-digital converter
Randomization, it is ensured that the signal peaks no longer occurred near input signal V (t) frequency range, and the extraction numeral that the method is used
In the integer multiple frequency of output signal frequency, this transmission coefficient has zero point to wave filter（The signal of the frequency is attenuated to nothing
It is poor small）, i.e. output signal is always zero on this frequency（Digital filter transfer coefficient spectrum figure is extracted referring to Fig. 2）.And
Dither signal generator is operated on the system clock frequency f_ck2 inside analog-digital converter, and it is same to extract digital filter
Sample is operated on the system clock frequency f_ck2 of converter, and both of which is determined by system clock frequency f_ck2, therefore,
The working frequency of the two modules is synchronous, and both match and mutually follow completely, and the dither signal always are taken out in this
Fetch in the zero point of word filter transfer coefficient, i.e., the dither signal can be eliminated to extraction digital filter, therefore, output letter
Number d (n) does not include dither signal y (t), and dither signal y (t) does not have any influence on the output signal-to-noise ratio of analog-digital converter, protects
The quality of output signal is demonstrate,proved.
Referring to shown in accompanying drawing 5, in Fig. 5（a）、（b）、（c）Figure is the type of the dither signal in the present embodiment, due to this
The dither signal that method is produced be single frequency point signal or single-frequency point and its harmonic wave, dither signal can be in time domain sine wave,
Square wave or both fittings are approximate, only f (t)=N*f_ck2 need to be met, in Fig. 5（a）It is shown, shake letter
Number sine wave, and f (t)=f_ck2 are used, such as（b）Shown, the dither signal uses sine wave, and f (t)=2*f_ck2, such as（c）
Shown, the dither signal uses square wave, and f (t)=2*f_ck2.This can be seen that, the present invention is to aspects such as precision of dither signal
Without requirement too high, can be realized with simple, more rough circuit, dither signal generator need not do compound action, therefore
Power consumption, size and the cost of dither signal generator can have been saved.
The examples of implementation of the above are only the preferred embodiments of the invention, not limit implementation model of the invention with this
Enclose, therefore the change that all shapes according to the present invention, principle are made, all should cover within the scope of the present invention.
Claims (1)
1. in a kind of analog-digital converter quantizing noise randomization method, it is characterised in that it includes loop filter, compares
Device, dither signal generator, D/A converter module, extraction digital filter, wherein the loop filter and dither signal hair
The signal output part of raw device connects the input of comparator, the signal output part simultaneous connection mould modular converter of comparator and takes out
The input of digital filter is taken, the output end of D/A converter module is again while the input of linkloop wave filter；
Its step includes：The firstth, the system clock frequency f_ck2 of analog-digital converter is set, one is added in analog-digital converter
Dither signal generator, the dither signal generator produce dither signal frequency by the analog-digital converter system clock frequently
Rate f_ck2 decisions, i.e. dither signal frequency f（t）=N*f_ck2, N are positive integer；
Secondth, extract digital filter working frequency determined by the system clock frequency f_ck2 of analog-digital converter, the extraction
The working frequency of digital filter is completely the same with dither signal frequency, and mutually follows；The comparator of loop, generation feedback letter
Number D/A converter module be then operated in f_ck2 lock a frequency multiplication f_ck1 higher on, f_ck1=M*f_ck2, M are
One larger positive integer；
3rd, the dither signal with enough amplitudes and frequency component is sent into after being superimposed with the output signal of loop filter and is compared
Device, the quantizing noise randomization for producing comparator；4th, the frequency selection purposes of the dither signal are extracting digital filtering
In the zero point of device transmission coefficient, the dither signal is extracted digital filter and filters.
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| CN104729540A (en) * | 2015-02-06 | 2015-06-24 | 北京宇航系统工程研究所 | High-precision measuring system and method for mechanical environment parameter of aircraft |
| CN105281775A (en) * | 2015-10-21 | 2016-01-27 | 昆腾微电子股份有限公司 | Digital-to-analogue conversion circuit and method |
| KR20170067581A (en) * | 2015-12-08 | 2017-06-16 | 삼성전기주식회사 | Apparatus for optical image stabilization |
| US9768793B2 (en) * | 2015-12-17 | 2017-09-19 | Analog Devices Global | Adaptive digital quantization noise cancellation filters for mash ADCs |
| TWI638518B (en) * | 2018-04-02 | 2018-10-11 | 新唐科技股份有限公司 | Electronic device and compensation method for zreo crossing distortion |
| CN111064531B (en) * | 2019-12-23 | 2022-04-12 | 西安空间无线电技术研究所 | Method and device for estimating signal-to-noise ratio loss of AD conversion in multi-carrier system |
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| US5010347A (en) * | 1987-09-25 | 1991-04-23 | Nec Corporation | Analog-to-digital converter having an excellent signal-to-noise ratio for small signals |
| US6268814B1 (en) * | 2000-03-14 | 2001-07-31 | Lucent Technologies Inc. | Carrier-dependent dithering for analog-to-digital conversion |
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|---|---|---|---|---|
| US5010347A (en) * | 1987-09-25 | 1991-04-23 | Nec Corporation | Analog-to-digital converter having an excellent signal-to-noise ratio for small signals |
| US6268814B1 (en) * | 2000-03-14 | 2001-07-31 | Lucent Technologies Inc. | Carrier-dependent dithering for analog-to-digital conversion |
| CN101707483A (en) * | 2009-11-12 | 2010-05-12 | 中国电子科技集团公司第四十一研究所 | Narrowband large-amplitude jitter generator for sampling system |
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Address after: 528000 South Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 1705, 2 Jiabang Gold Center, No. 1 Shilong South Road, Guicheng Street Patentee after: GUANGDONG HALO MICROELECTRONICS CO.,LTD. Address before: 528000 South Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 1705, 2 Jiabang Gold Center, No. 1 Shilong South Road, Guicheng Street Patentee before: Guangdong Xihuo Microelectronics Co.,Ltd. |
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Address after: Unit 305-308, block A8, core area, qiandenghu venture capital town, no.6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province Patentee after: GUANGDONG HALO MICROELECTRONICS Co.,Ltd. Address before: 528000 South Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 1705, 2 Jiabang Gold Center, No. 1 Shilong South Road, Guicheng Street Patentee before: GUANGDONG HALO MICROELECTRONICS Co.,Ltd. |
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Address after: Block A8, core area of qiandenghu venture capital town, No. 6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528299 view unit 305-308 in the map Patentee after: Guangdong Xidi Microelectronics Co.,Ltd. Address before: Unit 305-308, block A8, core area of qiandenghu venture capital town, No. 6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528299 Patentee before: GUANGDONG HALO MICROELECTRONICS Co.,Ltd. |
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Address after: Unit 305-308, block A8, qiandenghu venture capital town, no.6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528000 Patentee after: Xidi Microelectronics Group Co.,Ltd. Address before: Block A8, core area of qiandenghu venture capital town, No. 6, Guilan North Road, Guicheng Street, Nanhai District, Foshan City, Guangdong Province, 528299 view unit 305-308 in the map Patentee before: Guangdong Xidi Microelectronics Co.,Ltd. |