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A Fast Transient Response Digital LDO with a TDC-Based Signal Converter

College of Microelectronics, Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China
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Electronics 2020, 9(1), 132; https://doi.org/10.3390/electronics9010132
Received: 24 December 2019 / Revised: 7 January 2020 / Accepted: 8 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Low-Voltage Integrated Circuits Design and Application)

The digital low drop-out regulator (LDO) has been used widely in digital circuits for its low supply voltage characteristics. However, as the traditional digital LDOs regulate the output voltage code at a rate of 1 bit per clock cycle, the transient response speed is limited. This paper presents a digital LDO to improve transient response speed with a multi-bit conversion technique. The proposed technology uses a voltage sensor and a time-to-digital converter to convert the output voltage to digital codes. Based on a 65-nm CMOS process, the proposed DLDO reduces the settling time from 147.8 ns to 25.2 ns on average and the response speed is improved by about six times. View Full-Text
Keywords: low drop-out regulator; digital control; fast response; embedded power management low drop-out regulator; digital control; fast response; embedded power management
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Zhang, H.; Wan, P.; Geng, J.; Liu, Z.; Chen, Z. A Fast Transient Response Digital LDO with a TDC-Based Signal Converter. Electronics 2020, 9, 132.

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