在AB类输出级的基础上,结合正反馈辅助的B类输出级,提出了一种用于LCD驱动电路的大输出摆率、低功耗的输出缓冲放大器.在0.15μm高压CMOS工艺模型下,该放大器能够驱动0～20 nF范围的容性负载,静态电流为7μA,1%精度建立时间小于6μs,满足了LCD驱动电路行建立时间的要求;通过采用共源共栅频率补偿结合输出零点补偿技术,较好地满足了大动态范围容性负载的要求.
A high driving capability CMOS buffer amplifier with high slew-rate, low power consumption is proposed. Low power and high driving capability are achieved by using a Class AB push-pull stage and two Class B auxiliary stages with positive feedback. The design buffer amplifier draws 7 μA static current and the setting time to 1% precision is less than 6 μs under a 0～20 nF capacitance load with a 0. 15 μm CMOS model,which satisfies the setting time requirement of LCD driving circuit; By using cascoded frequency compensation combined with zero formed with the capacitive loads, large dynamic range of capacitive loads is satisfied.
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