The methodology design of low-power hybrid-cascade compensation operational amplifiers based on settling behavior

Operational amplifiers used in switch-capacitance applications must have high speed, high accuracy and low power consumption. In this paper a design method for a two-stage hybrid-cascade compensation operational amplifier based on settling behavior in closed-loop applications is proposed. This methodology, which optimizes the relationship between settling-time and bandwidth of an amplifier, has been used in designing operational amplifiers of a broad-band sigma-delta modulator that it´s settling accuracy is important. Utilizing this simple but accurate method has the better performance in power consumption and settling behavior, compared to the conventional methods.