Abstract: In some embodiments, a circuit is provided that includes (1) a plurality of light emitting diode (LED) strings coupled to each other in series; (2) a power supply circuit coupled to a first LED string of the plurality of LED strings; (3) a feedback circuit coupled between a second LED string of the plurality of LED strings and the power supply circuit; and (4) a current steering circuit coupled to the first LED string of the plurality of LED strings and further coupled to the second LED string of the plurality LED strings. The current steering circuit includes a plurality of switchable conductive pathways.

Abstract: Manufacturing and/or operational variations that affect performance of an integrated circuit (IC) are at least partially compensated for, by determining the magnitude of these variations and providing one or more corresponding control signals to a voltage regulator, which, responsive thereto, increases or decreases the magnitude of the output voltage. The output voltage of the voltage regulator is typically provided to a power supply node of the IC. Similarly, the output of the voltage regulator may be provided to a substrate portion of the IC, so as to provide a substrate bias that is variable in response to changes in the performance of the IC.