Despite the advantages that quadrature mixing offers to radio front-ends, its practical use has been limited due to its sensitivity towards gain and phase mismatches between its in-phase and quadrature channels. DC offsets are also a problem when a zero-IF transceiver topology is used. In this paper, novel digital compensation techniques are introduced to extract and correct the quadrature imba...

SiO,/Si,NJSiO, dielectric layer for memory capacitor'. IEDM tech dig., 1984, pp. 17S176 3 CHARMET, I. c., and DE GE"ES, P. G. : 'Ellipsometric formulas for an inhomogeneous layer with arbitrary refractive index profile', J . Opt. Soc. Am., 1983,73, p. 1977 4 HO, J. H., LEE, c. L., and LEI, T. F.: 'Error reduction in the ellipsometric measurement on thin transparent film', Solid-state Electron.,...

Phase-demodulation algorithms in interferometry often depend on a sequence of evenly spaced reference phase shifts. These phase shifts must be accurately calibrated and can be distorted by geometric effects, especially when spherical components with high curvature are tested. Here the resulting measurement errors are quantified through mathematical analysis, and it is shown that modern phase-es...

Complex three-dimensional patterns of multifunctional optical traps can be encoded in phase-only computer-generated holograms and projected with the holographic optical trapping technique. The trap-forming holograms, in turn, are implemented as diffractive optical elements whose phase transfer functions generally do not faithfully reproduce the design. We demonstrate that phase encoding errors ...

This paper considers the near-field source location problem for a nonuniform linear array (non-ULA) in the presence of sensor gain and phase errors. A sequential optimization calibration method is proposed to simultaneously estimate the gain and phase errors as well as the locations of calibration sources involving the ranges and the azimuths by exploiting some imprecise a-priori knowledge of c...

Background: Medication management is a complex process with multiple stages that involves different health care teams. Based on the evidence, an electronic medication management system offers significant benefits, such as reduced medication errors, improved conformity, enhanced time and cost efficiency, and increased patient safety. This study aimed to design and implement an electronic medicat...

A simple framework for the analysis of the effects of errors in the method of isomorphous replacement is developed. This framework is used to derive phase probability distributions similar to those given by Blow & Crick [Acta Cryst. present analysis suggests an improved means of calculating the mean-square 'lack-of-closure' residuals and shows that they differ by a factor of two for centric and...

one of the main concerns of processing algorithms used in synthetic aperture radar (sar) with a ballistic motion is the compensation of all phase errors in the data received from the target to achieve a clear picture of the target. in this article, by using range doppler algorithm and phase-gradient auto focus algorithm, imagery in one sar with a ballistic motion is considered according to the ...

Accurate, noninvasive measurements of liver fat content are needed for the early diagnosis and quantitative staging of nonalcoholic fatty liver disease. Chemical shift-based fat quantification methods acquire images at multiple echo times using a multiecho spoiled gradient echo sequence, and provide fat fraction measurements through postprocessing. However, phase errors, such as those caused by...