| 摘要 |
PURPOSE:To simplify the constitution to make the high-speed operation possible, by adding switches and inverters to the first and the third logical gates in the adding circuit which is adapted to incorporation into the sound synthesizing integrated circuit, etc. using the MOS transistor. CONSTITUTION:When input Ai and Bi and 0 together, switches S1 and S4 are turned on, and switches S2 and S3 are turned off, and output Si is the same signal as input Ci, and output Ci+1 becomes 0 due to inversion of NAND gate 1. When inputs Ai and Bi are 1, switches S1 and S4 are turned on, and switches S2 and S3 are turned off, and output Si is the same signal as input Ci, and output Ci+1 becomes 1. When one of inputs Ai and Bi is 1 and the other is 0, switches S1 and S4 are turned off, and switches S2 and S3 are turned off, and output Si becomes the inversion signal of input Ci, and output Ci+1 becomes the same signal as input Ci. |
