Measuring code edges of ADCs using interpolation and its application to offset and gain error testing

2002 ◽  
Author(s):  
P.N. Variyam ◽  
V. Agrawal
Keyword(s):  
Gain Error ◽  
Error Testing

scholarly journals Design Strategies and Architectures for Ultra-Low-Voltage Delta-Sigma ADCs

Electronics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1156
Author(s):  
Lorenzo Benvenuti ◽  
Alessandro Catania ◽  
Giuseppe Manfredini ◽  
Andrea Ria ◽  
Massimo Piotto ◽  
...  
Keyword(s):  
Low Voltage ◽  
Flicker Noise ◽  
Supply Voltage ◽  
Cmos Process ◽  
Clock Frequency ◽  
Design Environment ◽  
Ultra Low Power ◽  
Analog Cmos ◽  
Gain Error ◽  
Dc Gain

The design of ultra-low voltage analog CMOS integrated circuits requires ad hoc solutions to counteract the severe limitations introduced by the reduced voltage headroom. A popular approach is represented by inverter-based topologies, which however may suffer from reduced finite DC gain, thus limiting the accuracy and the resolutions of pivotal circuits like analog-to-digital converters. In this work, we discuss the effects of finite DC gain on ultra-low voltage ΔΣ modulators, focusing on the converter gain error. We propose an ultra-low voltage, ultra-low power, inverter-based ΔΣ modulator with reduced finite-DC-gain sensitivity. The modulator employs a two-stage, high DC-gain, switched-capacitor integrator that applies a correlated double sampling technique for offset cancellation and flicker noise reduction; it also makes use of an amplifier that implements a novel common-mode stabilization loop. The modulator was designed with the UMC 0.18 μm CMOS process to operate with a supply voltage of 0.3 V. It was validated by means of electrical simulations using the CadenceTM design environment. The achieved SNDR was 73 dB, with a bandwidth of 640 Hz, and a clock frequency of 164 kHz, consuming only 200.5 nW. It achieves a Schreier Figure of Merit of 168.1 dB. The proposed modulator is also able to work with lower supply voltages down to 0.15 V with the same resolution and a lower power consumption despite of a lower bandwidth. These characteristics make this design very appealing in sensor interfaces powered by energy harvesting sources.

scholarly journals Reanalysis of the 1992 South Pole Millimetre-Wavelength Atmospheric Opacity Data

2004 ◽  
Vol 21 (3) ◽  
pp. 264-274 ◽  
Author(s):  
Richard A. Chamberlin
Keyword(s):  
Time Series ◽  
Transfer Model ◽  
South Pole ◽  
Millimetre Wave ◽  
Atmospheric Opacity ◽  
Site Survey ◽  
Direct Measurements ◽  
Gain Error ◽  
Sky Brightness ◽  
Total Opacity

AbstractIn 1992 an NRAO 225-GHz site survey heterodyne radiometer was placed at the Geographical South Pole. The instrument operated over an entire annual cycle and provided direct measurements of the millimetre-wave sky brightness temperature as a function of zenith angle. Interpreted in a single-slab ‘skydip’ radiation transfer model of the atmosphere, these sky brightness measurements provided a time series of the millimetre atmospheric opacity. Statistics derived from this opacity time series were important for making comparisons with other candidate millimetre and sub-millimetre wave astronomy sites. This paper reexamines the 1992 measurements and the original analysis. Details of the skydip fit model, radiometer gain error, instrument stability, and a mid-season replacement to a window in the instrument enclosure combined to cause a modest under-reporting of the atmospheric opacity in previous reports. Unchanged are earlier conclusions that dry air makes a significant contribution to the total opacity at 225 GHz.

scholarly journals Quantification and mitigation of the airborne limb imaging FTIR GLORIA instrument effects and uncertainties

2021 ◽  
Author(s):  
Jörn Ungermann ◽  
Anne Kleinert ◽  
Guido Maucher ◽  
Irene Bartolomé ◽  
Felix Friedl-Vallon ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Infrared Detector ◽  
Correction Algorithm ◽  
Spectral Accuracy ◽  
Flight Data ◽  
Gain Error ◽  
Laboratory Calibration ◽  
Pointing Accuracy ◽  
First Time ◽  
Offset Error

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an infrared imaging FTS spectrometer with a 2-D infrared detector operated on two high flying research aircrafts. It has flown on eight campaigns and measured along more than 300 000 km of flight track. This paper details our instrument calibration and characterization efforts, which in particular leverage almost exclusively in-flight data. First, we present the framework of our new calibration scheme, which uses information from all three available calibration measurements (two blackbodies and upward pointing deep space measurements). Part of this scheme is a new correction algorithm correcting the erratically changing non-linearity of a subset of detector pixels and the identification of remaining bad pixels. Using this new calibration, we derive a 1-σ bound of 1 % on the instrumental gain error and a bound of 30 nW cm−2 sr−1 cm on the instrumental offset error. We show how we can examine the noise and spectral accuracy for all measured atmospheric spectra and derive a spectral accuracy of 5 ppm, on average. All these errors are compliant with the initial instrument requirements. We also discuss, for the first time, the pointing system of the GLORIA instrument. Combining laboratory calibration efforts with the measurement of astronomical bodies during the flight, we can derive a pointing accuracy of 0.032°, which corresponds to one detector pixel. The paper concludes with a brief study on how these newly characterised instrumental parameters affect temperature and ozone retrievals. We find that, first, the pointing uncertainty and, second, the instrumental gain uncertainty introduce the largest error in the result.

CCII-Based Voltage Amplifier Optimization for Reduced Relative Gain Error

2017 ◽  
Vol 37 (3) ◽  
pp. 1315-1326 ◽  
Author(s):  
Paolo Colucci ◽  
Arnaldo D’Amico ◽  
Andrea De Marcellis ◽  
Christian Falconi ◽  
Giuseppe Ferri ◽  
...  
Keyword(s):  
Relative Gain ◽  
Gain Error ◽  
Voltage Amplifier

Fast digital foreground gain error calibration for pipelined ADC

2019 ◽  
Vol 13 (2) ◽  
pp. 219-225
Author(s):  
Jupinder Kaur ◽  
Prince Prabhakar ◽  
Anil Singh ◽  
Alpana Agarwal
Keyword(s):  
Pipelined Adc ◽  
Gain Error ◽  
Error Calibration
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