Low-Power Design of Digital LDO With Nonlinear Symmetric Frequency Generation

Yamaguchi, Shun; Islam, Mahfuzul; Hisakado, Takashi; Wada, Osami

doi:10.1109/tcsii.2022.3184774

Cited by 7 publications

(1 citation statement)

References 16 publications

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“…For a supply voltage of 1.4 V with 200 mV dropout, the current efficiency is as high as 99.99% and the figure of merit is as low as 0.0487 ps.Based on asynchronous control, binary search is introduced in [12][13] to overcome linear step limitations. Subtly, the advantage of binary search is exploited in [14] to improve current efficiency under ACG. But it brings large overshoot/undershoot from the initialization of successive approximation register (SAR) at the same time.…”

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confidence: 99%

A 540-mA, 0.0487-ps-FOM Digital LDO based on Bi-directional Binary Search with Dual-loop Control

Chen,

Chen

et al. 2023

J. Phys.: Conf. Ser.

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A dual-loop digital low-dropout regulator based on the bi-directional binary search method is implemented in a 0.18-μm CMOS process in this paper. To improve the transient response, a bi-directional successive approximation register without initialization is proposed in coarse loop. To speed up fine adjustment during heavy loads, a two-dimensional MOSFET array is adopted to improve fine regulation step. Simulation results demonstrate that, during load current steps between 540 mA and 40 mA, the undershoot/overshoot is 364 mV/161 mV, and the digital LDO settles within 210 ns. For a supply voltage of 1.4 V with 200 mV dropout, the current efficiency is as high as 99.99% and the figure of merit is as low as 0.0487 ps.

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confidence: 99%