Redundant adders are characterized by limited carry propagation (indepen-
dent of the number of bits of the adder). The main types are:
9 Carry-save adder
9
Signed-digit adder
Different adder schemes are sometimes combined to achieve delay/area con-
straints, resulting in
hybrid adders.
These adders are not discussed in this book,
but references to them are included at the end of this chapter.
2~ About Carries
The production of the bit
S i (0
< i < n -- 1) in the addition ...
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