Patent ID: 6362765
Filing Date: 2002-03-26
Classification: H03K,H03M

Abstract:
A D/A converter comprising:2N (here, N=2, 3, 4, - - - , M=2N) constant electric current sources having addresses and respectively having constant electric current values i1, i2, i3, - - - , iM (here, i123< - - - M ) in which odd addresses are sequentially provided to the constant electric current sources belonging to one group consisting of a first group constructed by M/2 constant electric current sources having constant electric current values i123< - - - M/2 and a second group constructed by M/2 constant electric current sources having constant electric current values i(M/2+1), i(M/2+2), i(M/2+3), - - - , iM, and even addresses are sequentially provided to constant electric current sources belonging to another group; selecting means for selecting Di ones of the 2N constant electric current sources according to input data Di {here, Di=0, 1, 2, 3, - - - , (2Nâˆ’1)} having N-bits in input word length so as to use the 2N constant electric current sources one by one in accordance with an order of said addresses until a sum of values of one of the input data or a continuous plurality of the input data among the 2N constant electric current surfaces exceeds 2N; and electric current adding means for adding each of the constant electric current values from the Di constant electric current sources selected by the selecting means to each other to produce an analog signal.