| 摘要 |
PURPOSE:To reduce a chip size without the deterioration of various audio characteristics by using only an N channel MOS transistor or a P channel MOS transistor as each analog switch. CONSTITUTION:As the analog switch of a resistance ladder part 7, a switch 7b for setting a resistance value is composed of only the N channel MOS transistor and switches 8a and 8b for cutting and boosting are composed of the N channel MOS transistors as well. Thus, in the case of semiconductor integration using this constitution, the switches 7b, 8a and 8b are reduced in area to less than a half of the conventional transmission type, and the chip size is reduced. |
