Resistance ladder, D-A converter, and A-D converter

摘要

A resistance ladder which divides a potential difference between two power sources into 2m levels by a resistance group in the center portion, then adjusting the number of resistors which are disposed at the both end portions of the resistance ladder and interposed between the resistors of the center portion and the two power sources so that the division voltages of 2m levels are changed in (n-m) levels, with the result that the potential difference is divided into 2n levels. A D-A converter uses the resistance ladder. An A-D converter with the D-A converter which generates a reference voltage to be compared with an input voltage.