NDLI: Stability analysis of voltage regulators versus different digital control strategies by analog-mixed-signal circuit simulation

Content Provider	IEEE Xplore Digital Library
Author	Bizzarri, F. Brambilla, A.
Copyright Year	2014
Description	Author affiliation: DEI, Politec. di Milano, Milan, Italy (Bizzarri, F.; Brambilla, A.)
Abstract	Voltage regulator modules (VRMs) used in modern computers can work in “extreme” conditions since they supply high currents at a very low voltage and keep voltage swing inside a small tolerance interval against large variations of load currents. This is done by designing a digital controller that allows the VRM to behave as much as possible as an ideal voltage source with a very small series resistor. This can be achieved through different possible choices of controlling schema. We show that, considering also effects due to parasitics, controlling schema reflect on stability and on the admissible minimum size of the capacitor bank filtering the VRM output voltage. Moreover we show how the output impedance of the VRM degrades versus lowering of the bank size. This is done by resorting to a general and efficient technique, already presented in the literature, allowing to (i) determine the periodic steady state behaviour of these circuits together with their stability and (ii) derive time varying transfer functions such as, for example, the output impedance of VRMs.
Starting Page	1049
Ending Page	1053
File Size	530812
Page Count	5
File Format	PDF
ISBN	9781479947492
DOI	10.1109/SPEEDAM.2014.6872063
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-18
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors mixed mode simulation Stability analysis periodic small signal analysis Steady-state Voltage control saltation matrix dc/dc converter simulation VRM instability Circuit stability Impedance Integrated circuit modeling
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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