logging in or signing up jk vlsi2001 Raulo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 61 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: February 26, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript An Efficient Digital Sliding Controller for Adaptive Power-Supply Regulation: An Efficient Digital Sliding Controller for Adaptive Power-Supply Regulation Jaeha Kim and Mark HorowitzAdaptive Power-Supply Regulation: Adaptive Power-Supply Regulation Operating at lower frequency saves power, but not energy. a Power ~ V2f, Energy ~ V2. Adaptive power-supply regulation saves both by lowering voltage, too. Applications: mPs, DSPs, and high-speed I/Os.Adaptive Power-Supply Regulator: Adaptive Power-Supply RegulatorThe Controller: The Controller Switching power supplies regulate voltage. a Analog controllers Adaptive power-supplies regulate delay. a Digital controllers This work presents a simpler digital controller using sliding control.Outline: Outline Introduction Sliding Control Digital Implementation Measurement Results ConclusionsPhase Portraits: Phase PortraitsSliding Control (1): Sliding Control (1) Control law: dV/dt + (V-Vref)/t = 0. Effectively a first-order system with time constant t. Sliding Control (2): Sliding Control (2)Digital Sliding Controller (1): Digital Sliding Controller (1) Digital controller needs to estimate df/dt in: df/dt + (f-fref)/t = 0. Approach 1: measure the change in f for a fixed time duration. Approach 2: measure the elapsed time Dt for a fixed change in f, Df. afits the digital implementation betterDigital Sliding Controller (2): Digital Sliding Controller (2) The original sliding control law was: df/dt + (f-fref)/t =? 0. Use df/dt = Df/Dt, and rearrange: Dt =? -tDf/(f-fref) = -Nt/(f-fref). Measure Dt using a counter clocked at |f-fref|, i.e. Dt = N/|f-fref|, then: N =? Nt.Digital Sliding Controller (3): Digital Sliding Controller (3)Sensor Implementation: Sensor ImplementationChip Prototype: Chip Prototype 0.25-mm CMOS Controller area: 0.7x0.5mm2. On-chip power transistors: 4.4mm(P), 2.2mm(N). Off-chip components: 15.2mH (L), 21.6mF (C).Measurement Results (1): Measurement Results (1)Measurement Results (2): Measurement Results (2) 0mA 0mA 80mA Step change in fref Step change in load current 370MHz 150MHz 150MHzConclusions: Conclusions Sliding control is robust and fast in transients. The reformulated control law enables simple digital implementation. Scalability of the controller power keeps the efficiency high under low loads. A new sensor based on a ring-oscillator further reduces the area. Acknowledgements: Acknowledgements David Su, Sotirios Limotyrakis, & Wonjoon Choi Dean Liu, Stefanos Sidiropoulos, Gu-Yeon Wei, Ken Mai, & Dan Weinlader. Behzad Razavi & Brian Brandt National Semiconductor Sookyung Kim You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
jk vlsi2001 Raulo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 61 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: February 26, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript An Efficient Digital Sliding Controller for Adaptive Power-Supply Regulation: An Efficient Digital Sliding Controller for Adaptive Power-Supply Regulation Jaeha Kim and Mark HorowitzAdaptive Power-Supply Regulation: Adaptive Power-Supply Regulation Operating at lower frequency saves power, but not energy. a Power ~ V2f, Energy ~ V2. Adaptive power-supply regulation saves both by lowering voltage, too. Applications: mPs, DSPs, and high-speed I/Os.Adaptive Power-Supply Regulator: Adaptive Power-Supply RegulatorThe Controller: The Controller Switching power supplies regulate voltage. a Analog controllers Adaptive power-supplies regulate delay. a Digital controllers This work presents a simpler digital controller using sliding control.Outline: Outline Introduction Sliding Control Digital Implementation Measurement Results ConclusionsPhase Portraits: Phase PortraitsSliding Control (1): Sliding Control (1) Control law: dV/dt + (V-Vref)/t = 0. Effectively a first-order system with time constant t. Sliding Control (2): Sliding Control (2)Digital Sliding Controller (1): Digital Sliding Controller (1) Digital controller needs to estimate df/dt in: df/dt + (f-fref)/t = 0. Approach 1: measure the change in f for a fixed time duration. Approach 2: measure the elapsed time Dt for a fixed change in f, Df. afits the digital implementation betterDigital Sliding Controller (2): Digital Sliding Controller (2) The original sliding control law was: df/dt + (f-fref)/t =? 0. Use df/dt = Df/Dt, and rearrange: Dt =? -tDf/(f-fref) = -Nt/(f-fref). Measure Dt using a counter clocked at |f-fref|, i.e. Dt = N/|f-fref|, then: N =? Nt.Digital Sliding Controller (3): Digital Sliding Controller (3)Sensor Implementation: Sensor ImplementationChip Prototype: Chip Prototype 0.25-mm CMOS Controller area: 0.7x0.5mm2. On-chip power transistors: 4.4mm(P), 2.2mm(N). Off-chip components: 15.2mH (L), 21.6mF (C).Measurement Results (1): Measurement Results (1)Measurement Results (2): Measurement Results (2) 0mA 0mA 80mA Step change in fref Step change in load current 370MHz 150MHz 150MHzConclusions: Conclusions Sliding control is robust and fast in transients. The reformulated control law enables simple digital implementation. Scalability of the controller power keeps the efficiency high under low loads. A new sensor based on a ring-oscillator further reduces the area. Acknowledgements: Acknowledgements David Su, Sotirios Limotyrakis, & Wonjoon Choi Dean Liu, Stefanos Sidiropoulos, Gu-Yeon Wei, Ken Mai, & Dan Weinlader. Behzad Razavi & Brian Brandt National Semiconductor Sookyung Kim