REFERENCE VOLTAGE GENERATING CIRCUIT, AD CONVERTER, DA CONVERTER, AND IMAGE PROCESSING APPARATUS

摘要

PROBLEM TO BE SOLVED: To control an occupied area for two or more analog switches to a minimum while assuring an operating speed at which those analog switches output a desired reference voltage.;SOLUTION: The present invention uses two or more resistors R1-R(2ⁿ) to divide input reference voltage, and one of these two or more divided voltages is selected by one of multiple analog switches SW1 to SW(2ⁿ-1) to output it as a desired reference voltage. The multiple analog switches SW1 to SW(2ⁿ-1) each are made up of a transistor. The sizes of the multiple transistors each are made so as to be changed corresponding to the level of a reference voltage to be output.;COPYRIGHT: (C)2009,JPO&INPIT