涟漪
低压差调节器
CMOS芯片
瞬态响应
电压
跌落电压
负荷调节
控制理论(社会学)
电子工程
电气工程
工程类
分压器
计算机科学
人工智能
控制(管理)
作者
Lin Liu,Bowen Wang,Woogeun Rhee,Zhihua Wang
标识
DOI:10.1109/icta56932.2022.9963060
摘要
This paper presents an analog-assisted digital low dropout regulator (LDO) by adopting a delta sigma modulator (DSM) and a finite impulse response (FIR) filter for reduced output ripple. By employing a dual-mode gain-controlled voltage detector (GCVD) and a gear-shift algorithm, reduced recovery time is achieved. An exponential-ratio array (ERA) is designed to expand the load current range. A charge pump (CP) LDO as an analog-assisted loop enhances transient performance. The proposed digital LDO is implemented in 180nm CMOS. For an output voltage of 0.9V, a maximum load current of 100mA and 5500× load current range are achieved with an input voltage of 1V. The undershooting voltage is 78mV when the load current changes from 210mA to 100mA, and the output ripple is 0.37mV.
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