Symmetrical Residue-to-Binary Conversion Algorithm, Pipelined FPGA Implementation, and Testing Logic for Use in High-Speed Folding Digitizers
Ross Alan Monta · Defense Technical Information Center (DTIC) · 2005
The robust symmetrical number system (RSNS) can play a significant role in the reduction of encoding errors within a low-power folding analog-to-digital converter (ADC). A key part of this ADC design is the logic block that converts the symmetrical residues from each channel into a more convenient binary output. This thesis describes a robust symmetrical residue-to-binary conversion algorithm for moduli m1 = 7, m2 = 8, and m3 = 9 (ADC dynamic range M = 126). Also described is a pipelined digital logic implementation for use in high speed programmable logic or application specific integrated circuits. To verify correct outputs of the robust symmetrical residue-to-binary conversion algorithm, a digital test circuit is described that generates the thermometer code (symmetrical residues) for the 3-channel ADC design.