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Contents
Pp. 82 - 93
Anton Pletersek, Roman Benkovic and Janez Trontelj
[Open Access Plus] |
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A flash interpolator circuit inherent amplitude measurement algorithm, AMM, is described. A flash interpolation circuit converts a pair of periodic and orthogonal sine-signals into a stream of periodic – phase shifted sinusoidal signals, the amplitudes of which can be combined to produce useful information about the peak amplitude of the input sinesignals, independently of the signal's frequency. The proposed technique of amplitude measurement is suitable for automatic gain control, AGC, and the systems for automatic signal conditioning, where a flash interpolator is already a part of the integrated motion control system. An interpolation factor of 4 is shown to be sufficient for measuring amplitudes with an accuracy of 5.8 %. The patents regarding signals conditioning and interpolation are reviewed. The interpolator architecture, combined with an amplitude measuring system, has been designed, integrated as a part of the interpolator ASIC, evaluated and analyzed. The SoC ASIC for incremental optical encoders is designed and processed in 0.35 μm CMOS technology.
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Pp. 187 - 193
Hon Tat Hui
[Open Access Plus] |
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Mutual coupling is a common problem in the applications of antenna arrays. It significantly affects the operation of almost all types of antenna arrays. Over the past years, there have been many different kinds of methods suggested to decouple (or to compensate for) the mutual coupling effect in antenna arrays. The effectiveness of these methods varied and depended upon the types of antenna arrays being considered and the applications in which the antenna arrays were used. In this paper, a brief review of the decoupling methods for the mutual coupling effect in antenna arrays is presented. These include patented and non-patented methods. The methods are grouped under seven categories for antenna arrays in communications and four categories for antenna arrays in magnetic resonance imaging (MRI). The various methods will be first briefly described and their operation principles will be explained. Then some comments on their scopes of application and their comparisons or relations to other methods will be given. The problems associated with these methods will also be analysed. This is the first review on this topic and we believe that it helps to give an overview of the decoupling methods which have been so far proposed in the literature. We also believe that this review will help clarify some main differences and relations between the various decoupling methods and provide some information for future research on the problem of mutual coupling.
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