Journal ArticleDOI
Analysis of the power delivery path from the 12-V VR to the microprocessor
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TLDR
In this paper, a thorough analysis of the power delivery path is presented, based on which the current slew rate of each loop is derived, and the relationship between inductor current slew rates of the voltage regulator and the bandwidth is also derived.Abstract:
This paper offers a thorough analysis of the power delivery path. Based on the power delivery path model, the current slew rate of each loop is derived. The relationship between the inductor current slew rate of the voltage regulator (VR) and the bandwidth is also derived. Then, the level of the voltage spike across the capacitors of each loop is determined, after which the relationship between the bandwidth and the capacitance can be plotted. We find that for today's power delivery structure, the bulk capacitors can be eliminated as long as the bandwidth is pushed beyond 350 kHz. The experimental results of a 2-MHz two-stage 12-V VR verify this analysis.read more
Citations
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Journal ArticleDOI
A Digital Current-Mode Control Technique for DC–DC Converters
TL;DR: In this article, the authors proposed a simple digital current mode control technique for dc-dc converters, where the inductor current is sampled only once in a switching period, and a compensating ramp is used in the modulator to determine the switching instant.
Proceedings ArticleDOI
Koala: a platform for OS-level power management
TL;DR: This work presents Koala, a platform which uses a pre-characterised model at run-time to predict the performance and energy consumption of a piece of software, and an arbitrary policy can then be applied in order to dynamically trade performance andEnergy consumption.
Proceedings ArticleDOI
Voltage divider and its application in the two-stage power architecture
TL;DR: In this article, an ultra-high power density DC/DC converter with fixed conversion ratio is proposed for the two-stage power architecture in the area of power management for the processor based power systems, including server, desktop, laptop, and other battery powered portable applications.
Proceedings ArticleDOI
High Power Density, High Efficiency System Two-stage Power Architecture for Laptop Computers
TL;DR: In this article, a two-stage power architecture for laptop voltage regulators is proposed, which takes advantage of the thermal design power (TDP) requirement in the laptop, VRs for microprocessor, graphics, DDR memory and main power can share the same first stage with very low design power.
Journal ArticleDOI
Two-stage approach for 12-V VR
TL;DR: In this article, the authors proposed a two-stage approach for the 12-V voltage regulator, which can realize high frequency, thus reducing the output capacitance and therefore decreasing the cost.
References
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Journal ArticleDOI
Design considerations for low-voltage on-board DC/DC modules for next generations of data processing circuits
TL;DR: In this article, the authors present design considerations for these on-board power supplies and discuss their performance limits imposed by various circuit and system parasitics, and discuss the performance limits of point-of-load power supplies.
Journal ArticleDOI
Resonant free power network design using extended adaptive voltage positioning (EAVP) methodology
A. Waizman,Chee-Yee Chung +1 more
TL;DR: Extended adaptive voltage positioning (EAVP) is a new robust methodology for the design and analysis of a low impedance resonant free power delivery network, which utilizes and extends the theory of AVP that is commonly used in voltage regulator module (VRM) design and operation.
Journal ArticleDOI
An active clamp circuit for voltage regulation module (VRM) applications
A.M. Wu,Seth R. Sanders +1 more
TL;DR: The active clamp as discussed by the authors is a linear voltage regulator, with a voltage deadband to allow for voltage ripple, that is designed to operate in parallel with a switchmode voltage regulator.
Proceedings ArticleDOI
Optimal design of the active droop control method for the transient response
TL;DR: In this paper, a small-signal model of the active droop control method, which is shown to be a two-loop feedback control system, is discussed, in order to achieve equal crossover frequencies for the two loops so that constant output impedance is realized in the voltage regulator.
Proceedings ArticleDOI
Design considerations for VRM transient response based on the output impedance
TL;DR: In this article, the transient response of voltage regulator modules (VRMs) based on small-signal models is discussed, and a constant resistive output impedance design for the VRM is proposed, and its limitation in application is analyzed.