CUED Publications database

A Time-Division-Multiplexed Clocked-Analog Low-Dropout Regulator

Xie, Z and Ye, K and Wang, KX and Cheng, Q and Tan, M (2021) A Time-Division-Multiplexed Clocked-Analog Low-Dropout Regulator. IEEE Transactions on Circuits and Systems I: Regular Papers, 68. pp. 1366-1376. ISSN 1549-8328

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This paper presents a time-division-multiplexed (TDM) clocked-analog low-dropout regulator (CLDO) that shares one controller between multiple output channels. Clocked-analog operation is introduced to create idle periods that enable the shared controller to independently regulate different output channels through time-division multiplexing. Furthermore, an asynchronous transient enhancing technique is presented. Thanks to the controller sharing, the TDM CLDO is more area-efficient than conventional designs for supplying multiple outputs, especially when power stages and on-chip loads are small. To verify the effectiveness of the TDM CLDO, a dual-channel version is fabricated in a 130 nm CMOS process. Measurement results show that it can independently track two 100 kHz 0.3~\rm V{pp} sinusoidal signals with 4 mV average output error at 100~\Omega load and 6 MHz clock frequency. For load transient responses, it can independently regulate two output channels to 1.05 V and 0.95 V with 41 mV/88 mV and 67 mV/39 mV overshoot/undershoot when both channels experience 5 mA current steps at 1.2~\rm V{dd}. To the best of our knowledge, this is the first time that hardware sharing is implemented for continuous closed-loop systems.

Item Type: Article
Depositing User: Cron Job
Date Deposited: 21 Jan 2021 03:48
Last Modified: 08 Apr 2021 05:33
DOI: 10.1109/TCSI.2021.3049492