Decompensating amplifiers improve performance

摘要

Designers often want to minimize amplitude error in sensor-based systems. This goal often leads to specifying the gain error of an amplifier's closed-loop gain over the frequency range of the sensor. Engineers commonly specify the bandwidth of an amplifier in terms of its — 3-dB frequency, but, from a gain-accuracy point of view, almost a 30% gain error occurs at this frequency. The term "effective bandwidth" connects the frequency response of the amplifier and the gain accuracy that the application requires. You define the effective bandwidth as the bandwidth for which the gain error is less than or equal to a specified error.