A new parallel technique for design of decrement/increment and two's complement circuits

A novel design technique for the construction of a decrement/increment and two's complement (DIT) circuit is presented. The technique is shown to be highly efficient of both in terms silicon area consumption and time. More interestingly, it is shown that the operation delay is almost independent of the word size, and hence the method is best used for high-density codes. Structurally, the circuit is made of two parallel paths: one for the input data and one for the generation of the control signal to be utilized for DIT operation through the data path. The circuit is designed and simulated for 64-bit word length using CMOS technology. For the worst-case situation, a 14.7 ns response time is reported.<>