JSSC 2009第2期Digital Circuits0.35μmNeural Network Accelerator

A Rail-To-Rail Class-AB Ampliﬁer With an Offset Cancellation for LCD Drivers Chi

提出一种适用于高色深和高分辨率LCD驱动器的轨到轨Class-AB放大器，具有偏移消除功能。

0.35μm CMOS, 5V电源, 7.5μA静态电流, 3μs建立时间, 0.48mV偏移电压

放大器Class-AB放大器LCD驱动器偏移消除轨到轨放大器

▸创新点1：双互补差分对设计，采用主辅助跨导放大器结构，实现全输入电压摆幅，提升LCD驱动器的分辨率和电压驱动能力。

▸创新点2：偏移消除技术，通过主辅助跨导放大器协同工作，显著降低器件失配和电荷注入引起的偏移电压和误差，偏移电压低至0.48 mV。

▸创新点3：电荷守恒技术，在偏移消除的同时降低动态功耗，无需增加驱动周期，静态电流仅为7.5 µA，提升能效。

▸创新点4：集成偏移消除与电荷守恒操作，在同一时间段完成，优化时序设计，确保3 µs的快速建立时间，满足高分辨率LCD驱动需求。

Abstract

ampliﬁer with an offset cancellation, which is suitable for high color depth and high-resolution liquid crystal display (LCD) drivers, is proposed. The ampliﬁer incorpo- rates dual complementary differential pairs, which are classiﬁed as main and auxiliary transconductance ampliﬁers, to obtain a full input voltage swing and an offset canceling capability. Both offset voltage and injection-induced error, due to the device mismatch and charge injection, respectively, are greatly reduced. The offs