Adder arithmetic units

Adder arithmetic units

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Adders are a universal component of nearly every computing system, whether traditional or modern. Even the most fundamental machine, which performs no arithmetic, requires an adder to calculate address offsets and branch instructions. Adders are also generally less complex than other arithmetic units found in system. This chapter introduces four different adders: a ripple-carry adder, a carry-look-ahead adder, a carry-select adder, and a conditional-sum adder. The traditional CMOS circuits for each of the adders are described, and the performance and area of these designs are each analyzed. The adders vary in terms of their complexity. The simplest design is the ripple-carry adder, and the most complex design is the carry-look-ahead adder. In general, as the complexity of the adder increases, the speed and performance improve.

Chapter Contents:

  • 3.1 Ripple-carry adders
  • 3.2 Carry-lookahead adders
  • 3.3 Carry-select adders
  • 3.4 Conditional-sum adders

Inspec keywords: CMOS logic circuits; logic design; adders

Other keywords: carry-look-ahead adder; computing system; address offsets; complex design; carry-select adder; ripple-carry adder; CMOS circuits; conditional-sum adder; adder arithmetic units; branch instructions

Subjects: Logic circuits; Digital circuit design, modelling and testing; Logic design methods; CMOS integrated circuits; Logic and switching circuits

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