OF THE DISSERTATION Harmonic Distortion Correction in Pipelined Analog to Digital Converters

Improvements in technology, increasing in resolution and various correction techniques of analogue-to-digital converters (ADC) makes linearity testing of ADC difficult and time-consuming task. New methods and approaches are examined. Statical and histogram tests require long time measurement and huge amount of data to be analysed. This paper deals with original approach for ADC modelling and te...

A fully integrated 5.5 GHz high-linearity low noise amplifier (LNA) using post-linearization technique, implemented in a 0.18μm RF CMOS technology, is demonstrated. The proposed technique adopts an additional folded diode with a parallel RC circuit as an intermodulation distortion (IMD) sinker. The proposed LNA not only achieves high linearity, but also minimizes the degradation of gain, noise ...

The performance of speech systems such as speaker recognition degrades drastically when there is mismatch between training and testing conditions, caused by non-linear distortion. This paper describes a technique to estimate and correct such non-linear distortion in speech. The focus is on constrained restoration of degraded speech, that is distortion in the test speech is undone relative to th...

Non-linearity of wireless transceivers, specifically power amplifier (PA) non-linearity, could pose major limitations towards having high throughput, and cost energy efficient communication systems. Such from the PA is typically compensated in transmitter, e.g. by applying back-off or performing digital-pre-distortion (DPD) aiming to linearize transmitter. However, leads lower efficiency, outpu...

Fluoroscopic images suffer from multiple modes of image distortion. Therefore, the purpose of this study was to compare the effects of correction using a range of two-dimensional polynomials and a global approach. The primary measure of interest was the average error in the distances between four beads of an accuracy phantom, as measured using RSA. Secondary measures of interest were the root m...

This paper describes how geometric distortion correction and image processing operation can be performed in realtime on an IVIP system. The IVIP is a modified version of RVIP RVIP is currently being manufactured and it is going to be used for radar signal processing. The IVP is targeted to perform the time consuming first stages of image processing. This includes geometric distortion correction...

Introduction: Significant distortion can often be observed in body diffusion weighted images (DWI) using single shot EPI. Distortion is caused by external magnetic field (B0) inhomogeneity. The degree of distortion is proportional to B0. When a precise B0 map is obtained, distortion can be corrected using the B0 map. In this study, we demonstrate that a B0 map obtained using three point-Dixon m...

Welding-induced distortion is an intrinsic problem arising due to the mismatch of thermal expansions in the weld and surrounding material. The distortion can be minimized through the pre-process, in process, or post-process methodology. In the present paper, the laser forming (LF) technology is utilized for the post correction of the welding-induced distortion. Three types of weld paths are app...