D/A and A/D converters utilizing weighted impedances
 An apparatus for converting the sum of m digital signals to an analog signal utilizing resistors and switches only. The operating time of the apparatus is the time required to pass the signal through a single switch. This invention can also be utilized in an A/D converter for converting the difference between an analog signal and several digital signals to a digital signal without using extra time to compute the subtraction. 
H
H03M
inventional
Chih C.
Chang