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针对有源OLED面板驱动芯片源驱动模块对高速低功耗运算放大器的要求,基于高阶系统频率补偿理论和小信号建立理论,通过结合共栅共源密勒(cascode Miller)补偿和输出零点补偿,提出一种用于轨到轨高速低功耗运算放大器的新型频率补偿方法,只需很小的密勒补偿电容和静态工作电流,就可以高速、稳定地驱动大电容负载。采用0.18μm CMOS数模混合信号工艺,通过EDA软件仿真,结果表明,在4 V电源电压和20 pF负载电容下,该运算放大器的轨到轨建立时间为0.76μs,静态工作电流仅为2.6μA,相位裕度为55°,只需要120 fF的密勒补偿电容。
Aiming at the requirement of high-speed and low-power op-amp for active OLED panel driver chip driver module, based on the theory of high-order system frequency compensation and small signal establishment, by combining cascode Miller compensation and output zero point compensation , A new frequency compensation method for rail-to-rail high-speed, low-power operational amplifier is proposed, which can drive large capacitive loads with high speed and stability with a small Miller compensation capacitor and quiescent operating current. Using 0.18μm CMOS digital-to-analog mixed-signal technology and EDA software simulation, the results show that the opto-amplifier has a rail-to-rail settling time of 0.76μs and a quiescent operating current of only 2.6μA at a supply voltage of 4 V and a load capacitance of 20 pF , The phase margin is 55 °, only 120 fF Miller compensation capacitance is required.