公开(公告)号：JPH11163730A

公开(公告)日：1999-06-18

申请号：JP23939098

申请日：1998-07-22

Applicant: ANALOG DEVICES INC

Inventor： DENNIS DEMPSEY ,  CHRISTOPHER GORMAN

IPC: H03M1/68 ,  H03M1/76

Abstract: PROBLEM TO BE SOLVED: To provide a D/A converter that is suitable for manufacturing integrated circuits. SOLUTION: A first resistance array 12 of a D/A converter, having a couple of resistance arrays 10 is connected across a voltage source 15 and produces a voltage. A first switching network 34 gives a voltage selected in resistors in the first resistance array to a second resistance array 14. A second switching network 42 outputs a voltage selected in resistors in the second resistance array 14. Any resistance in the second resistance array 14 is higher than a resistance selected from the resistors of the first resistance array 12 to cause the load effect on the second resistance array 14 to be reduced. The resistance of the second resistance array 14 and the switching network 42 is selected so as to cause a step change by 1 LSB substantially.