Examination of an FPGA-based Sinc Filter for High Precision Current Sensing Signals

Abstract

The most popular solution to high-speed current sensing involves the usage of a shunt resistor combined with a SAR ADC module. However, as the need for higher sampling speeds and larger bandwidth increase, the typical SAR ADC module is replaced with a Sigma Delta one. The method of using this type of ADC chip with conventional design elements is described in this paper. The required sinc filter necessary for the ADC data to be correctly is implemented in programmable logic.