Power Budget per Reading across Competing Sensing Principles
Sensing power budgets depend on physical excitation energy, analog settling delays, and converter sampling overhead across operating duty cycles.
Amplifier Settling Time
Response Accuracy
Interval required for an output signal to enter and remain within a specified error band following a step input. Measurement of amplifier settling time begins at the moment the input transition commences and concludes when the output stays within a tolerance such as 0.1 percent or 0.01 percent of the final value. This duration accounts for the initial propagation delay, the slew rate limited portion of the swing, the ring-down time, and the final linear recovery phase.
Error Band
Selection of the target window dictates the reported value. A high speed amplifier might settle to 1 percent in nanoseconds while requiring much longer to reach 0.01 percent accuracy due to thermal tails or ringing. Measurement equipment must possess higher bandwidth than the device under test to avoid masking the actual recovery behavior.
Load Sensitivity
Output capacitance directly increases the duration of ringing.
Thermal Tail
Long term drift after the initial slew event occurs when internal components undergo temperature changes during a large signal swing. Dissipated power within the silicon die creates gradients that shift the input offset voltage slightly. Such effects are visible as a slow crawl toward the final value after the high speed transients have subsided.