The architecture and algorithmic advancements of the Harris HSP50016 digital downconverter (DDC) are described. The DDC is a fully programmable single-chip downconverter designed to perform intermediate frequency (IF) to baseband processing for communications signal processing. The operation and specification of each major function within the DDC are described, and justification for key specifications is given. The end-to-end performance of the DDC is shown, and the methodology used for measuring the performance is explained. >
The architecture of an efficient high-decimation rate filter is presented. A high-decimation rate filter can extract narrowband signal intelligence from a wideband signal. As a result, it is important to many signal processing applications found in communications and instrumentation. The presented high-decimation rate filter is a multi-rate system consisting of a cascaded integrator-comb (CIC) section and a finite impulse response (FIR) filter. The function of the CIC section is to perform efficient high-decimation filtering over the entire frequency band. The function of the FIR filter is to achieve prespecified transition band performance at baseband. The authors investigate the CMOS implementation of a 33 MHz high-decimation rate filter, its hardware implementation, and its performance. Examples of its use are also provided. >
The aim of this study is to propose a experimental verification for single-phase to three phase drive system composed of two parallel single-phase rectifiers, a three-phase inverter and an induction motor. Apart from traditional application in dc motor drives, new applications of BDC include energy storage in renewable energy systems, fuel cell energy systems, Hybrid Electric Vehicles (HEV) and Uninterruptible Power Supplies (UPS). A dc-dc converter is always required to allow energy exchange between storage device and the rest of system. In HEV applications, BDCs are required to link different dc voltage buses and transfer energy between them. A non-isolated bi-directional dc-dc converters is used in our project to achieve better efficiency.