Pipelined Two-Operand Modular Adders

• Main Authors: M. Czyzak, J. Horiszny, R. Smyk
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2015-04-01
• Series: Radioengineering
• Subjects: Carry-lookahead adder; FPGA; modular adder; parallel-prefix adder; residue number system (RNS); ripple-carry adder; VLSI design
• Online Access: http://www.radioeng.cz/fulltexts/2015/15_01_0148_0160.pdf

Pipelined two-operand modular adder (TOMA) is one of basic components used in digital signal processing (DSP) systems that use the residue number system (RNS). Such modular adders are used in binary/residue and residue/binary converters, residue multipliers and scalers as well as within residue processing channels. The design of pipelined TOMAs is usually obtained by inserting an appriopriate number of latch layers inside a nonpipelined TOMA structure. Hence their area is also determined by the number of latches and the delay by the number of latch layers. In this paper we propose a new pipelined TOMA that is based on a new TOMA, that has the smaller area and smaller delay than other known structures. Comparisons are made using data from the very large scale of integration (VLSI) standard cell library.