Digital control of a two-terminal resistance
Vempati G. K. Murti · Electronics Letters · 1983
An arrangement of a small number of discrete resistors in series is described such that the terminal resistance can be varied in digital steps through the closure of just one switch for each step. The errors due to the on-resistance of the switches are shown to be less than in the 8R-4R-2R-R arrangement for a decade range.