A Method to Effectively Decrease the Settling Time of Gain-Boost OTA

caroline11

A method was proposed to decrease the settling time of gain-boost folded cascode operational trans-conductance amplifier(OTA). Through the small-signal analysis of gain-boost OTA, the expression of pole and zero was attained successfully; then the effect of pole-zero (doublet) on settling time was revealed fully. To reduce its effect, a method was finally proposed that the unity-gain frequency (ow) of regulation amplifier should be a little larger than the unity-gain frequency (ou) of core amplifier. This method was proven to be effective by simulation result.