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Polyphase Comb Filter Based on Dispatching Input Bit-stream and Interlaying Multiplexer Techniques for Sigma-Delta ADCs

Abdollahvand S., Goes J., Paulino N., Gomes L.

International Journal of Microelectronics and Computer Science

2012

Vol. 3, nr 4

152-158

This paper describes a new design approach for implementing a Polyphase Comb Filter (PCF) based on dispatching input bit-stream and interlaying multiplexer techniques. In order to make our solution more energy efficient in comparison with prior art, we start with a detailed analysis of the drawbacks and advantages of the existing classical techniques. A new structure based on a novel SINC3 design is proposed. This new design uses a controller unit to activate one sub-filter in each specific time interval. As a consequence, no input registers and switches are required. Since this decimation filter is working with a single-bit output bit-stream, the required multiplication function can be simply done by using interlaying multiplexers (MUXs). By interlaying different levels of MUXs along with the navigation of the input bit stream we can easily emulate the multiplication operation. The implementation in a Xilinx Spartan3 FPGA demonstrates the feasibility and hardware efficiency of our solution . The proposed new filter architecture can be readily applicable to any Sigma-Delta (ΣΔ) ADC with a single-bit output stream and it requires a reduced number of adders and registers when compared with the state-of-the-art approaches.

New Trends in Motion Capture Systems for Human Gait Analysis

Długosz R., Pauk J., Farine P. A.

Machine Graphics and Vision

2011

Vol. 20, No. 3

319-331

The paper presents new trends in motion capture systems for human gait analysis, such as: resonant magnetic techniques, inertial techniques, and wireless positioning techniques based on Ultra-Wideband (UWB) communication. The new techniques, due to the irrelatively low expected prices, can replace expensive optical systems that are commonly used today. As the new systems are mostly based on the Wireless Sensor Network (WSN) technology, any improvement in their ranging precision, which is a key aspect in this case requires development of new ultra low power microelectronics circuits. Selected solutions in this area are presented in the paper.