A Fully-Integrated LDO with Two-Stage Cross-Coupled Error Amplifier for High-Speed Communications in 28-nm CMOS

Dongfan Xu; Yangyi Zhang; Zhenghao Li; Xiongshi Luo; Pingyi Cai; Hongzhi Wu; Liping Zhong; Weitao Wu; Liru Zhu; Quan Pan

10.1109/ISCAS46773.2023.10181630

2023

0271-4302

978-1-6654-5110-9

2023 IEEE International Symposium on Circuits and Systems (ISCAS)

2023-May

1-4

21-25 May 2023

Monterey, CA, USA

This paper presents a fully-integrated flipped-voltage-follower-based low-dropout regulator (LDO), with proposed high-gain two-stage cross-coupled error amplifier (XCEA). Besides, the effectiveness of bypass capacitors and diversified load capacitors is discussed. Consuming $\mathbf{170}-\boldsymbol{\mu} \mathbf{A}$ quiescent current and occupying area of 0.019 mm2, the LDO features 25-MHz unity-gain bandwidth (UGB) at 20-mA load to satisfy fast response requirement in high-speed transmitter. The simulated voltage undershoot is 38.85 mV for a load transient current stepping from $\mathbf{1}\ \boldsymbol{\mu} \mathbf{A}$ to 25 mA in 50 ps with $\boldsymbol{C}_{\mathbf{L}} =\mathbf{100}\ \mathbf{pF}$. Owing to the proposed XCEA and the filter capacitor, the PSR is measured to be -41 dB at 100 kHz and -36 dB at 1 MHz.

Cross-coupled error amplifier (XCEA) flipped voltage follower (FVF) super source follower (SSF)

第一

CPCI-S ; EI

WOS:001038214601042

20233314552527

Buffer amplifiers ; CMOS integrated circuits ; Electric current regulators ; Voltage regulators

Electric Equipment:704.2 ; Amplifiers:713.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Control Equipment:732.1

IEEE

School of Microelectronics, Southern University of Science and Technology, Shenzhen, China

Dongfan Xu,Yangyi Zhang,Zhenghao Li,et al. A Fully-Integrated LDO with Two-Stage Cross-Coupled Error Amplifier for High-Speed Communications in 28-nm CMOS[C],2023:1-4.