Patent ID: 6559785
Filing Date: 2003-05-06
Classification: H03M

Abstract:
A digital/analog converter for converting a binary coded data word D into an analog output signal, having:a) a capacitor cell matrix comprising capacitor cells which are arranged in matrix form in columns and rows and are driven by control signals via control lines; b) a first coding device for recoding n more significant data bits of the data word D to be converted into a column control signal which has a width of 2n bits and is applied to the capacitor cell matrix via column control lines; c) a second coding device for recoding m less significant data bits of the data word D to be converted into a row control signal which has a width of 2m bits and is applied to the capacitor cell matrix via row control lines; d) each capacitor cell of the capacitor cell matrix in each case having an associated local decoding circuit which drives switches in a manner dependent on the row control signal and the column control signal, which switches through-connect at least one capacitor contained in the capacitor cell to different reference voltages (Vp, Vn); e) wherein the capacitor cell is of multilayer construction; and f) wherein the control lines and the local decoding circuits being arranged below the capacitors.