Digital-to-analog converter having constant current cells producing even constant currents

摘要: A digital-to-analog converter includes MOS transistors formed in the identical configuration and arranged a matrix array. Ones of placed on inner part array serve as constant current cells, while others around function dummy capacitance. Each transistor has its gate, source drain electrodes connected to metal strip which gate electrode each cells is connected. Thus, are substrate or potential well via diodes consisting transistors, thereby electric charges generated strips due plasma etching like treatment being discharged through well. The thus able produce even currents.