Patent attributes
An object of the present invention is to form a highly accurate current source for D/A converters. Letters from a1 to an where n is at least 4 represent current source cells that output constant currents, each of which is composed of MOS transistors etc. These current source cells are arranged in two dimensional matrix and a plurality of these current source cells are connected to form a current source that has a predetermined current value. Current source cells in any one row of the two dimensional matrix are labeled with letters from a1 to an. A first kind of row is in the same order as this row. A second kind of row is obtained from the first kind of row by exchanging a series of elements being letters from ai to ai+j where both i and j are integers at least 1 and i+j is an integer not more than n/2 with a series of elements being letters from ak to ak+j where k is an integer larger than n/2 and k+j is an integer not more than n. The two dimensional matrix comprises a same number of these two kinds of row.
