CN103634005A - Method for randomizing quantizing noise in analog-digital converter - Google Patents
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Abstract
The invention provides a method for randomizing the quantizing noise in an analog-digital converter. The method comprises the following steps: setting the clock frequency of the analog-digital converter to be f_ck2, adding a dithering-signal generator into the analog-digital converter, determining the frequency of dithering signals generated by the dithering-signal generator by the clock frequency f_ck2 of the analog-digital converter; setting a comparator and a digital-analog converter on higher doubled frequency f_ck1 locked by the f_ck2; then superimposing the dithering signals and output signals of a loop filter and then sending the superimposed signals into the comparator to enable the quantizing noise generated by the comparator to be randomized; selecting the frequency of the dithering signals on a zero point of a transmission coefficient of an extraction digital filter, and filtering the dithering signals by the extraction digital filter. The method provided by the invention has the advantages that the output signal-noise ratio of the analog-digital converter is not influenced by the dithering signals, the mechanism of the generated dithering signals is simple, the implementation is easy, the requirement of the amplitude accuracy of the dithering signals is not high, and the power consumption, size and cost of the dithering-signal generator are saved.
Description
Technical field
The present invention relates to the technical field of analog to digital converter, refer in particular to a kind of randomized method of quantizing noise in analog to digital converter.
Background technology
In existing analog to digital converter, especially SIGMA-Delta (Sigma-Delta) analog to digital converter, its functional module generally all includes input summer, loop filter, comparator, feedback D/A converter module and FIR and extracts digital filter, its basic principle is to adopt high frequency over-sampling, utilize near the high-gain of the loop filter signal frequency range of need processing, and the narrow-band frequency response of extracting digital filter, reach the object that completes high precision analogue conversion with more rough analog-to-digital conversion module.The input signal of this analog to digital converter is analog signal V (t), and output signal is digital signal d (n).In actual converted, the digital signal d of output (n) also can be with the quantizing noise being produced by comparator, the signal to noise ratio important of the amplitude of this quantizing noise in required processing signals bandwidth to analog to digital converter.In typical SIGMA-Delta analog to digital converter, if adopted the loop of low order loop filter, the quantizing noise that causes comparator to produce does not meet white noise frequency spectrum, and has very strong relevance with the frequency spectrum of input signal V (t).Under the intensity and frequency spectrum of certain input signal V (t), quantizing noise can produce larger spectrum component and amplitude in the signal frequency range of needs, by extracting after digital filtering ripple, the quantizing noise of high frequency can be by filtering, but near input signal V (t) frequency range, quantizing noise has the spike that many amplitudes are higher, and this will inevitably reduce the output signal-to-noise ratio of analog to digital converter.
The common method addressing this problem is at present for adding a dither signal generator in the inside of analog to digital converter, the signal y (t) that this dither signal generator produces is random signal, its frequency spectrum is white noise, this white noise random signal y (t) can play the harmonic relationships that interrupts input signal and comparator output signal, greatly reduce both relevances, make quantizing noise randomization.But, there is in this way very large shortcoming, that is the randomness of dither signal to be required strict, and dither signal must all be wanted height random in frequency and amplitude, and the required precision of equipment that produces this dither signal is high, can bring larger power consumption and cost.If can not reach height random requirement, at input signal amplitude hour, quantizing noise still has the spike in very large signal frequency range, simultaneously, because dither signal itself is also a noise, dither signal can be exported in extracting digital filter, for the output signal-to-noise ratio of whole analog to digital converter, has certain influence.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of reasonable in design reliable, can effectively make quantizing noise randomization in analog to digital converter, on the amplitude required precision of dither signal, low and output signal-noise ratio is not subject to the randomized method of quantizing noise in analog to digital converter that dither signal affects completely.
For achieving the above object, technical scheme provided by the present invention is: a kind of randomized method of quantizing noise in analog to digital converter, and it includes:
The first, the system clock frequency f_ck2 of analog-to-digital conversion device is set, in analog to digital converter, add a dither signal generator, the dither signal frequency that this dither signal generator produces is determined by the system clock frequency f_ck2 of this analog to digital converter, be dither signal frequency f (t)=N*f_ck2, N is positive integer;
The second, the operating frequency of extraction digital filter is determined by the system clock frequency f_ck2 of analog to digital converter, and this operating frequency and dither signal frequency that extracts digital filter is in full accord, and mutually follows; The comparator of loop, the D/A converter module that produces feedback signal is operated in the frequency multiplication f_ck1 higher with of f_ck2 locking above, f_ck1=M*f_ck2, M is a larger positive integer.
Three, have after the dither signal of enough amplitudes and frequency component and the output signal of loop filter superpose and send into comparator, the quantizing noise randomization that comparator is produced;
Four, the frequency selection purposes of described dither signal extracted on the zero point of digital filter transmission coefficient, and this dither signal is extracted digital filter filtering.
The present invention is after having adopted such scheme, its great advantage is by adding new dither signal generator in analog to digital converter inside, the frequency of dither signal that this dither signal generator produces is relevant with the system clock frequency of this analog to digital converter, be the dither signal frequency that system clock frequency has determined dither signal generator, output signal by dither signal and loop filter superposes, then send in comparator, because amplitude and the frequency component of this dither signal are enough large, make the quantizing noise that comparator produces can randomization, simultaneously, owing to the frequency of described dither signal and zero point of extracting the transmission coefficient of digital filter being all that system clock frequency by whole analog to digital converter determines, both mate completely and mutually follow, this has guaranteed that dither signal is forever all in extracting on the zero point of digital filter, this makes dither signal by extracting after digital filter, this dither signal is by filtering, this makes dither signal regardless of amplitude size, extract the output signal of digital filter all without dither signal, it is the impact that the output signal-to-noise ratio of whole analog to digital converter is not subject to dither signal, simultaneously, the mechanism that produces dither signal is simple, easily realize, and it is not high to the amplitude required precision of dither signal, dither signal generator is without doing compound action, therefore the power consumption that can save dither signal generator, size and cost.
Accompanying drawing explanation
Fig. 1 is analog-digital converter function block diagram of the present invention.
Fig. 2 is extraction digital filter transmission coefficient spectrogram of the present invention.
Fig. 3 is dither signal spectrogram of the present invention.
Fig. 4 is the spectrogram of main node signal of the present invention.
Fig. 5 is dither signal time-domain diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
Referring to accompanying drawing 1 to shown in accompanying drawing 4, the randomized method of quantizing noise in the analog to digital converter described in the present embodiment, it includes:
The first, the system clock frequency f_ck2 of analog to digital converter is set, in analog to digital converter, add a dither signal generator, the dither signal frequency that this dither signal generator produces is determined by the system clock frequency f_ck2 of this analog to digital converter, be dither signal frequency f (t)=N*f_ck2, N is positive integer;
The second, the operating frequency of extraction digital filter is determined by the system clock frequency f_ck2 of analog to digital converter, and this operating frequency and dither signal frequency that extracts digital filter is in full accord, and mutually follows; The comparator of loop, the D/A converter module that produces feedback signal is operated in the frequency multiplication f_ck1 higher with of f_ck2 locking above, f_ck1=M*f_ck2, M is a larger positive integer;
Three, have after the dither signal of enough amplitudes and frequency component and the output signal of loop filter superpose and send into comparator, the quantizing noise randomization that comparator is produced;
Four, the frequency selection purposes of described dither signal extracted on the zero point of digital filter transmission coefficient, and this dither signal is extracted digital filter filtering, for the not impact of output signal-to-noise ratio of whole analog to digital converter.
According to the randomized method of quantizing noise in above-mentioned analog to digital converter, the randomized processing mode of this analog to digital converter quantizing noise is: the input signal of this analog to digital converter is analog signal V (t), analog signal V (t) is successively by after input summer and low order loop filter, superimposed in the output of loop filter and the dither signal y (t) of dither signal generator generation, and send in the lump in comparator, comparator can produce quantizing noise, middle high-speed digital signal d1 (n) in comparator output comprises input signal v (t), quantizing noise and dither signal y (t), and because this dither signal y (t) has enough amplitudes and frequency component, the white noise dither signal conventional with prior art is the same, can effectively make the quantizing noise randomization of analog to digital converter, guaranteed the signal peaks no longer occurring near input signal V (t) frequency range, and the extraction digital filter that the method adopts is in the integer multiple frequency of output signal frequency, this transmission coefficient has zero point (signal of this frequency is attenuated to infinitesimal), be that output signal is always zero (referring to Fig. 2, extracting digital filter transmission coefficient spectrogram) on this frequency.And dither signal generator is to be operated on the system clock frequency f_ck2 of analog to digital converter inside, and extract digital filter, be operated in equally on the system clock frequency f_ck2 of transducer, both are determined by system clock frequency f_ck2, therefore, the operating frequency of these two modules is synchronous, both mate completely and mutually follow, this dither signal always extracts on the zero point of digital filter transmission coefficient in this, this dither signal eliminates to extraction digital filter, therefore, output signal d (n) does not comprise dither signal y (t), dither signal y (t) on the output signal-to-noise ratio of analog to digital converter without any impact, guaranteed the quality of output signal.
Shown in accompanying drawing 5, (a) in Fig. 5, (b), (c) figure is the type of the dither signal in the present embodiment, the dither signal producing due to the method is single frequency point signal or single-frequency point and its harmonic wave, dither signal can be sine wave in time domain, square wave or both matchings are approximate, only need meet f (t)=N*f_ck2, as shown in (a) in Fig. 5, this dither signal adopts sinusoidal wave, and f (t)=f_ck2, as shown in (b), this dither signal adopts sinusoidal wave, and f (t)=2*f_ck2, as shown in (c), this dither signal adopts square wave, and f (t)=2*f_ck2.This can find out, the present invention does not have too high requirement to the aspects such as precision of dither signal, can with simply, more rough circuit realizes, dither signal generator, without doing compound action, therefore can have been saved power consumption, size and the cost of dither signal generator.
The examples of implementation of the above are only the present invention's preferred embodiment, not with this, limit practical range of the present invention, therefore the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
Claims (1)
1. the randomized method of quantizing noise in analog to digital converter, is characterized in that, it includes:
The first, the system clock frequency f_ck2 of analog to digital converter is set, in analog to digital converter, add a dither signal generator, the dither signal frequency that this dither signal generator produces is determined by the system clock frequency f_ck2 of this analog to digital converter, be dither signal frequency f (t)=N*f_ck2, N is positive integer;
The second, the operating frequency of decimation filter of digital is determined by the system clock frequency f_ck2 of analog to digital converter, and this operating frequency and dither signal frequency that extracts digital filter is in full accord, and mutually follows; It is upper that the D/A converter module of the comparator of loop, generation feedback signal is operated in the frequency multiplication f_ck1 higher with of f_ck2 locking, f_ck1=M*f_ck2, and M is a larger positive integer;
Three, have after the dither signal of enough amplitudes and frequency component and the output signal of loop filter superpose and send into comparator, the quantizing noise randomization that comparator is produced;
Four, the frequency selection purposes of described dither signal extracted on the zero point of digital filter transmission coefficient, and this dither signal is extracted digital filter filtering.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN106856552A (en) * | 2015-12-08 | 2017-06-16 | 三星电机株式会社 | Blurring compensation device |
| CN106899302A (en) * | 2015-12-17 | 2017-06-27 | 亚德诺半导体集团 | The adaptive digital quantizing noise of MADS ADCS eliminates wave filter |
| CN110350917A (en) * | 2018-04-02 | 2019-10-18 | 新唐科技股份有限公司 | The compensation method of electronic device and zero-crossing distortion |
| CN111064531A (en) * | 2019-12-23 | 2020-04-24 | 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106856552A (en) * | 2015-12-08 | 2017-06-16 | 三星电机株式会社 | Blurring compensation device |
| CN106856552B (en) * | 2015-12-08 | 2020-06-16 | 三星电机株式会社 | Jitter correction device |
| CN106899302A (en) * | 2015-12-17 | 2017-06-27 | 亚德诺半导体集团 | The adaptive digital quantizing noise of MADS ADCS eliminates wave filter |
| CN110350917A (en) * | 2018-04-02 | 2019-10-18 | 新唐科技股份有限公司 | The compensation method of electronic device and zero-crossing distortion |
| CN111064531A (en) * | 2019-12-23 | 2020-04-24 | 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 |
| 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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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. |