| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-speed and area saving adder circuit for adding the binary number of (n) digits, the binary number of one digit and a constant '1'. SOLUTION: For the first input signal of (n) bits and the second input signal of one bit this circuit is provided with an OR circuit for obtaining the OR of the least significant bit 403 of the first input signal and the second input signal 450 and a NAND circuit for obtaining the AND of the OR output of the least significant bit of the first input signal and the second input signal and the second least significant bit of the first input signal.
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