Patent ID: 7982650

Claim:
A digital-to-analog converter (DAC) comprising: an R-2R transistor-only ladder converter converting digital signals into a linear analog output current and comprising: a source input terminal; a gate input terminal; a drain output current terminal; a dump output current terminal; multiple cells operating in a linear region, being connected in sequences of parallel and series, each cell converting one bit for digital-to-analog conversion, being connected to the adjacent cells; digital input terminal pairs receiving digital signals in binary (0/1) and driving the ON/OFF corresponding to the cells; and a dump transistor comprising: a gate, the gate of the dump transistor being connected to the gate input terminal; a drain, the drain of the dump transistor being connected to the dump output current terminal; and a source, the source of the dump transistor being connected to an adjacent cell; and a controller being connected to the R-2R transistor-only ladder converter and changing the linear analog output current of the R-2R transistor-only ladder converter into an optimum non-linear analog output current.