Hybrid adder comprising multiple sub-adders, each of which uses a different carry propagation scheme

摘要

Disclosed is a mixed-type adder with optimized design costs. The mixed-type adder includes I sub adders, (where, I is a positive number larger than 1). An overall bit width of the mixed-type adder is divided into I bit groups which are respectively allocated to the I sub adders. The I sub adders have different carry propagation schemes and are connected in series through a carry signal.