Spectral Spurs due to Quantization in Nyquist ADCs

Pan, Hui; Abidi, A.A.

doi:10.1109/tcsi.2004.832755

Cited by 39 publications

(17 citation statements)

References 34 publications

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“…Dithering is the act of injecting a known but random amount of noise to the input of the ADC [4].The basic concept of PN dithering is to extract the errors and calibrate it in digital domain.…”

Section: Pn Dithering Conceptmentioning

confidence: 99%

Radix-based digital calibration method for pipelined ADCs with signal-dependent dithering

Zhu

Lee

2012

2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology

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This paper presents a new digital calibration method for a 14-bit 140MS/s pipelined analog-to-digital converter (ADC). Signal-dependent Pseudo-random Noise (PN) sequences are injected into the first 3.5-bit multiplying digital-to-analog converter (MDAC) without interrupting its normal conversion operation to extract the radix term, which includes finite opamp gain, settling error and capacitor mismatch. Compared to conventional fixed magnitude PN dithering, signal-dependent dithering greatly improves the signal-to-noise plus distortion (SNDR) of the ADC and reduces the calibration time. By using proposed method, the ADC achieves a peak SNDR of 81.5dB and spurious-free dynamic range (SFDR) of 102.8dB with 31.6MHz input at 140MS/s and the ENOB is improved from 6.5 bits to 13.25 bits.

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Section: Pn Dithering Conceptmentioning

confidence: 99%

Radix-based digital calibration method for pipelined ADCs with signal-dependent dithering

Zhu

Lee

2012

2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology

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“…In quantized systems the injection of external excitation signals at the input of the quantizer is a typical solution for attenuating the distortion [11]. Thus, we consider to inject a scalar excitation signal at the quantizer input and, for the analysis of the system, it will be useful to apply the averaging theory presented so far.…”

Section: Gain Schedulingmentioning

confidence: 99%

“…The study is motivated by applications in mechanical friction [6], such as stickslip drives [7], power electronics [8], such as pulse-width modulated converters [9], feedback systems [10] and quantized systems [11]. For instance, excitation signals are used for power electronics converters in order to ensure a finite and constant switching frequency and in relay feedback systems for quenching undesired oscillations such as limit cycles.…”

Section: Introductionmentioning

confidence: 99%

On the averaging of a class of hybrid systems

Iannelli

Johansson

Jönsson

et al. 2004

2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601)

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Abstract-Modeling abstraction and time-scale separation in the design of complex systems often leads to hybrid dynamics. Discontinuities in the continuous evolution of a hybrid system may however create difficulties in the formal analysis, as well as in numerical simulation and verification. Here we study a class of hybrid systems that are excited by high-frequency external signals. These systems arise in the modeling of switched power converters, mechanical systems with friction and quantized systems. For a quite general class of excitation signals, an averaging result is shown stating that the hybrid system can be approximated by a Lipschitzcontinuous system. The approximation is in the order of the maximal repetition interval of the excitation signal.

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“…Dithering is often used to increase spurious free dynamic range (SFDR) of analog to digital converters (ADCs) [7], [8]. In such an application, a wideband noise is added to converter's input signal to randomize the error caused by nonuniform distribution of quantization levels.…”

Section: Introductionmentioning

confidence: 99%

Multiplierless Implementation of Digital Colored Noise Generator

Vučić

Butorac

2014

Automatika

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Original scientific paperColored noise can be generated by filtering of the white noise. It is a simple task. However, it becomes challenging if high operating speed of the generator is required. The realization of digital filter generally requires one multiplication per coefficient. Therefore, a high operating speed is achieved only with the cost of several generalpurpose multipliers. In this paper, a multiplierless realization of the colored noise generator is proposed. It is based on the filtering of 1-bit random signal by a finite impulse response filter. The design of the generator is described and its implementation is considered. Furthermore, an application is described in which the proposed generator is used in mitigation of undesired effects caused by nonlinearities in an analog to digital converter.Key words: Noise generator, Colored noise, Dither generator, Analog to digital converter, ADC, Multiplierless implementation, Field programmable gate arrays, FPGA Implementacija digitalnog generatora obojenog šuma bez množila. Obojeni šum može se generirati filtriranjem bijelog šuma. To je jednostavan postupak. Meutim, on postaje izazovan ako se od generatora traži velika brzina rada. Realizacija digitalnog filtra u pravilu zahtijeva jedno množenje po koeficijentu. Zato se velika brzina rada može postići samo uz cijenu većeg broja množila opće namjene. U ovom radu predložena je realizacija generatora obojenog šuma koja ne sadrži množila. Ona se temelji se na filtraciji 1-bitnog slučajnog signala pomoću filtra s konačnim impulsnim odzivom. Opisano je projektiranje generatora te je razmotrena njegova implementacija. Nadalje, opisana je primjena u kojoj je predloženi generator iskorišten za smanjivanje utjecaja nelinearnosti u analogno digitalnom pretvorniku.Ključne riječi: generator šuma, obojani šum, generator podrhtavanja, analogno digitalni pretvornik, ADC, implementacija bez množila, programabilna logička polja, FPGA

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Spectral Spurs due to Quantization in Nyquist ADCs

Cited by 39 publications

References 34 publications

Radix-based digital calibration method for pipelined ADCs with signal-dependent dithering

Radix-based digital calibration method for pipelined ADCs with signal-dependent dithering

On the averaging of a class of hybrid systems

Multiplierless Implementation of Digital Colored Noise Generator

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