Abstract

This talk will discuss ongoing research activities at the Electronics Systems group, Linköping University, with applications suitable for the LOIS and LOFAR instruments. Techniques for high-speed as well as flexible analog-to-digital conversion (ADC) and dedicated beam forming hardware are discussed.

For high-speed ADC an architecture with parallel time-interleaved converters are utilized. Timing errors are identified and mitigated using digital signal processing (DSP) techniques. Two techniques for flexible ADCs (trading resolution for sampling rate) are also presented. These are also based on parallel interleaved ADCs, so they use a similar type of error mitigation. A decimation filter architecture for changing sample rates using several different factors is also presented.

Furthermore, efficient architectures of beam forming algorithms using dedicated hardware are presented. These includes both offline and online reprogrammable architectures. For online reconfigurability multiply-accumulate (MAC) or distributed arithmetic architectures can be used. If offline reprogrammability is allowed, the sum-of-products computation can be solved using multiple constant multiplication (MCM) techniques to obtain low-complexity hardware.

The presentation (PDF)