POWER DELIVERY NETWORK DEGRADATION DETECTION IN A COMPUTING DEVICE

Degradation of a power delivery network (PDN) in a computing device may be detected as part of a self-test during booting of the computing device or a device subsystem. The computing device may be an automotive vehicle control system. A clock signal provided to logic circuitry supplied by the PDN may be modulated, and the modulation frequency may be varied over a range. Voltage droop values in the logic circuitry may be measured in response to the modulation frequencies over the range. Impedance values may be determined by determining an odd harmonic of each of the voltage droop values. The impedance values may be compared with thresholds, and an alert or other indication may be issued if one or more of the impedance values exceeds a threshold.