A Feedforward Controlled On-Chip Switched-Capacitor Voltage Regulator Delivering 10W in 32nm SOI CMOS
METADATA ONLY
Loading...
Author / Producer
Date
2015-02
Publication Type
Other Conference Item
ETH Bibliography
yes
Citations
Altmetric
METADATA ONLY
Data
Rights / License
Abstract
On-chip (or fully integrated) switched-capacitor (SC) voltage regulators (SCVR) have recently received a lot of attention due to their ease of monolithic integration. The use of deep trench capacitors can lead to SCVR implementations that simultaneously achieve high efficiency, high power density, and fast response time. For the application of granular power distribution of many-core microprocessor systems, the on-chip SCVR must maintain an output voltage above a certain minimum level U out, min in order for the microprocessor core to meet setup time requirements. Following a transient load change, the output voltage typically exhibits a droop due to parasitic inductances and resistances in the power distribution network. Therefore, the steady-state output voltage is kept high enough to ensure V OUT >V out, min at all times, thereby introducing an output voltage overhead that leads to increased system power consumption. The output voltage droop can be reduced by implementing fast regulation and a sufficient amount of on-chip decoupling capacitance. However, a large amount of on-chip decoupling capacitance is needed to significantly reduce the droop, and it becomes impractical to implement owing to the large chip area overhead required. This paper presents a feedforward control scheme that significantly reduces the output voltage droop in the presence of a large input voltage droop following a transient event. This in turn reduces the required output voltage overhead and may lead to significant overall system power savings.
Permanent link
Publication status
published
External links
Editor
Book title
2015 IEEE International Solid-State Circuits Conference (ISSCC)
Volume
58
Pages / Article No.
362 - 363
Publisher
IEEE
Event
62nd IEEE International Solid-State Circuits Conference (ISSCC 2015)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03573 - Kolar, Johann W. (emeritus) / Kolar, Johann W. (emeritus)