A histogram based calibration algorithm for MDAC linear and nonlinear errors in pipeline ADCs

2018 ◽  
Author(s):  
Yue-Hong Gong ◽  
Min Luo ◽  
Hao-Yu Wang ◽  
Shao-Jun Zhang ◽  
Xiong-Fei Meng
Keyword(s):  
Calibration Algorithm ◽  
Linear And Nonlinear ◽  
Pipeline Adcs ◽  
Nonlinear Errors

A Low Complexity Digital Foreground Calibration Technique for CMOS Pipelined ADCs

2019 ◽  
Vol 28 (03) ◽  
pp. 1950045
Author(s):  
Maliang Liu ◽  
Sirui Zhang ◽  
Hu Jin ◽  
Zhangming Zhu ◽  
Yintang Yang
Keyword(s):  
Input Signal ◽  
Low Complexity ◽  
Cmos Process ◽  
Pipeline Adc ◽  
Calibration Technique ◽  
Pipelined Adcs ◽  
Integral Nonlinearity ◽  
Linear And Nonlinear ◽  
Pipeline Adcs ◽  
Foreground Calibration

A low complexity all-digital foreground calibration technique to correct linear and nonlinear errors is proposed for pipeline ADCs in this paper. This method based on the integral nonlinearity (INL) piecewise least-squares fitting improves the linearity and obtains better SNR and SFDR performance. Two switches are added to the pre-stage reference ladder to achieve an accurate measurement of the INL and DNL of the backend ADC, which reduces the calibration complexity and improves the linearity effectively. The method was applied to a 125[Formula: see text]MS/s 14-bit pipeline ADC fabricated in a 0.18[Formula: see text][Formula: see text]m CMOS process. The raw DNL and INL were 1[Formula: see text]LSB and 8[Formula: see text]LSB, respectively, without calibration, but with calibration, they were respectively improved to 0.25[Formula: see text]LSB and 2[Formula: see text]LSB. The ADC achieved an SNR of 64.5[Formula: see text]dB, an SFDR of 73.8[Formula: see text]dB and a THD of 72.7[Formula: see text]dB with a 10[Formula: see text]MHz input signal without calibration, but after calibration these figures were improved to 72.6[Formula: see text]dB, 87.5[Formula: see text]dB and 86.6[Formula: see text]dB, respectively. Its application can also be extended to SAR ADC architecture, etc.

Linear and Nonlinear Optical Properties of Natural Dyes Freestanding Films and Application in Optical Limiting

2020 ◽  
pp. 139-143
Keyword(s):  
Absorption Coefficient ◽  
Water Solution ◽  
Optical Limiting ◽  
Refraction Index ◽  
Laser Wavelength ◽  
Solid State Laser ◽  
Natural Dyes ◽  
Linear And Nonlinear ◽  
532 Nm ◽  
Absorbance Spectra

Natural dyes were followed and prepared from a pomegranate, purple carrot, and eggplant peel. The absorbance spectra was measured in the wavelength range 300-800 nm. The linear properties measurements of the prepared natural dye freestanding films were determined include absorption coefficient (α0), extinction coefficient (κ), and linear refraction index (n). The nonlinear refractive index n2 and nonlinear absorption coefficient β2 of the natural dyes in the water solution were measured by the optical z-scan technique under a pumped solid state laser at a laser wavelength of 532 nm. The results indicated that the pomegranate dye can be promising candidates for optical limiting applications with significantly low optical limiting of 3.5 mW.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

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