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A. Brat$ 2. University 1. Motorola SPS -Logic and h a l o Technolo ies Group, Tempe, AZ 85284, of Arizona ECE Dept. Tuscon, AZ 8 5 7 2 1 , 3 .~i n g t o n~i c r~e l e c t r o n i c s Limited, Northwich, Cheshire, UK. AbstractA Field Programmable Analog Array (FPAA) is presented based on switched capacitor technology. The architecture offers an unconstrained topology similar to its digital counterpart, containing an array of identical undedicated analog cells. This makes it possible to program both the functionality of each cell and the interconnect between cells. As a result a large number of diverse architectures may be implemented.The analog array can be programmed to perform many of the routine tasks associated with control systems design. It's linear and non-linear signal processing abilities can provide a wide range of waveform generation functions. The device can also be programmed for precise phase and magnitude characteristics. Some examples related to control systems are discussed.

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More and more EMC tests have shown that the radiated emission problems of the equipment under test mainly concentrate on the intercon- nected power cables and cable connectors. Measurement of shielding performance is a prerequisite for quantitative and qualitative evaluation of the frequency-dependent characteristic of braided-shield power cables and cable connectors. Due to the asymmetric geometric structures of these cable assemblies, compared with the coaxial and symmetrical communication cables, the commonly used transfer impedance testing methods may not be suitable. In view of this, several improved simple and effective measurement methods, including transfer impedance and shield reduction factor testing methods, were proposed in recent years. These methods, based on the equivalent circuit model of the characteristic parameters, provide good repeatability for the measurement of shielding performance. This paper presents an overview analysis of various measurement techniques for shielding performance of power cables and cable connectors, highlights some of its equivalence principle in measurement setups, and showcases a brief comparison between transfer impedance and shield reduction factor.

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