Iterative D:A converter - avoids unwanted output voltage rise from constant current sources when latter are switched to resistor network

摘要

The iterative D/A converter is designed so that the constant current sources exhibit no unwanted rise in their output voltages when switched to and from the R-2R resistor network. Each of the constant current sources has a normally-closed short-circuiting switch assigned to it. Each of these switches only opens when a switch of one of the group of current supply switches assigned to the corresponding current source is closed, over which the corresponding constant current source can be connected to the R-2R resistor network.