Digital/analog converter

摘要

Digital/analog converter for converting a binary coded data word into an analog output signal, having a capacitor cell Iratrix (9) comprising capacitor cells (13ij) which are arranged in matrix form in columns and rows and are driven by thermometer-coded control signals via control lines; a first coding device (6) for recoding the n more significant data bits of the data word D to be converted into a thermometer-coded column control signal which has a width of 2n bits and is applied to the capacitor cell matrix (9) via column control lines (8), a second coding device (11) for recoding the m less significant data bits of the data word D to be converted' into a thermometer-coded row control signal which has a width of 2 bits and is applied to the capacitor cell matrix (9) via row control lines (12), each capacitor cell (13ij) of the capacitor cell matrix (9) in each cast having an associated local decoding circuit (1911) which drives switches (34, 35, 36, 37) in a manner dependent on the thermometer-coded row control signal and the Hits thermometer-coded column control signal, which switches through-connect at least one capacitor (30, 31) contained in the capacitor cell (13ij) to different reference voltages (Vp, Vn). 1 List of reference symbols 1 Digital/analog converter 2 Digital data input 3 Analog signal output 4 Data lines 5 Buffer store 6 First coding device 7 Lines 8 Column control lines 9 Capacitor cell matrix 10 Lines 11 Second coding device 12 Row control lines 13 Capacitor cell 14 Voltage supply line 15 Line 16 Line 17 Reference voltage terminal 18 Reference voltage terminal 19 Local decoding circuit 20 Control terminal 21 Control terminal 22 Control terminal 23 Control output 24 Control output 25 Logic circuit 26 Logic circuit 27 Logic circuit 28 Line 29 Inverter 30 Capa