4.7 Article

A Distributed Power Delivery Grid Based on Analog-Assisted Digital LDOs With Cooperative Regulation and IR-Drop Reduction

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2020.2979336

Keywords

Voltage control; Power grids; Clocks; Regulators; Regulation; Power supplies; Topology; Distributed power delivery grid; analog-assisted digital LDO; cooperative regulation; adaptive control; multi-phase clock; ripple reduction

Funding

  1. Research Grant Council of Hong Kong SAR Government, China [16206615]

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This paper introduces an on-chip distributed power delivery grid (DPDG) with cooperative regulation and IR-drop reduction based on analog-assisted digital LDOs (AADLDOs), which inherit the merits of low output ripple and sub-LSB current supply ability from the analog control, and the advantage of low supply voltage operation and adaptive fast response from the digital control. With the distributed power delivery topology, the IR-drop across the power supply rail can be reduced, especially in large area power-supply applications. The AADLDOs in the power delivery grid work cooperatively to obtain a balance between improved response speed and power consumption. A prototype of a 3 x 3 power grid with 9 AADLDOs, providing a total of 500-mA maximum load current with an on-chip 0.9-nF output capacitor, is fabricated in a 65-nm CMOS process to demonstrate the proposed DPDG concept and the effectiveness of this scheme. A maximum voltage undershoot of 125mV is measured with a 450mA/20ns load step, resulting a figure-of-merit as low as 0.249ps.

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