Described are methods and circuits that reduce or eliminate the impact of power-supply fluctuations on circuit performance. IC dies include compensation circuitry that compares local power-supply voltages to relatively stable reference voltages, such as unloaded distributed supply voltages, to sense local supply-voltage fluctuations. Based upon this comparison, the compensation circuitry adjusts circuit characteristics that might otherwise suffer performance degradation. Receivers in accordance with some embodiments automatically tailoring their gain to the output characteristics of a number of possible transmitter types with which the receivers may be expected to communicate.