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A Two-Phase Fully-Integrated DC-DC Converter with Self-Adaptive DCM Control and GIPD Passive Components
|關鍵字:||DC-DC converter;fully-integrated converter;GIPD process;直流對直流轉換器;全整合型轉換器;玻璃基板製作被動元件||引用:|| C.-H. Chia, P.-S. Lei, R. C.-H. Chang, and Y.-B. Hong 'A fully integrated dc-dc converter for dynamic voltage scaling applications,' IEEE Symposium on Circuits and Systems, May 2012, pp. 2263-2266.  W. Xu, Y. Li, Z. Hong, and D. Killat, 'A 90% peak efficiency single-inductor dual-output buck-boost converter with extended-PWM control,' IEEE International Solid-State Circuits Conference Digest of Technical Papers, Feb. 2011, pp. 394-396.  J. Kim, D. S. Kim, and C. Kim, 'A single-inductor 8-channel output DC-DC boost converter with time-limited one-shot current control and single shared hysteresis comparator,' Symposium on VLSI Circuits, Jun. 2011, pp. 14-15.  Y.-H. Lee, T.-C. Huang, Y.-Y. Yang, W.-S. Chou, K.-H. Chen C.-C. Huang, and Y.-H. 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Harjani, 'A high-efficiency DC-DC converter using 2nH integrated inductors,' IEEE Journal of Solid-State Circuits, vol. 43, no. 4, pp. 844-854, Apr. 2008.||摘要:||
This dissertation presents a two-phase fully-integrated DC-DC converter for modern electronic systems, especially for system-in-package (SiP) systems with passive components fabricated using a glass-substrate integrated passive device (GIPD) process. Before introducing this converter, the mode-control circuit and the high-speed DC-DC converter are proposed. The technique of mode-control circuit is the foundation of the self-adaptive DCM controller and can improve the efficiency at light load current. The converter using the mode-control circuit improves the efficiency of 36.14% compared to a conventional PWM converter at load current of 10-mA. The high-speed converter raises the switching frequency to 50-MHz and reduces the inductor and capacitor to 10-nH and 100-nF. The transient response is 47-ns and 279-ns from heavy to light load and from light to heavy load, respectively. In the proposed two-phase fully-integrated DC-DC converter, the self-adaptive discontinuous-conduction mode (DCM) controller and low-swing/full-swing buffer were incorporated to reduce the switching loss and maintain high efficiency at high switching frequency. A secondary phase and phase controller were added to increase the output power and reduce the output ripple. The proposed GIPD solution packages a standard complementary metal-oxide semiconductor (CMOS) process and GIPD process in 3D format to reduce the footprint of the system. The proposed self-adaptive DCM controller and low-swing/full-swing buffer improve efficiency of 15% in measurement compared to our previous work on GIPD process  in simulation. The peak efficiency of the proposed converter was 79.09% at a 400-mA load current, 5% higher than the peak efficiency in . The maximal output power could reach 720-mW and the maximal switching frequency (fCCM) was designed to be 70-MHz (measured at 50-MHz) with only two 6-nH inductors and one 15-nF capacitor.
本論文主要提出一個用於現代電子系統，特別是SiP (system in package)系統所使用的雙相位全整合型直流對直流轉換器，此轉換器的被動元件是採用玻璃基底整合被動元件(GIPD)製程所實現。在介紹此轉換器前，論文中會先介紹模式控制器(mode-control circuit)與高速轉換器(high-speed converter)。模式控制器是自動適應非連續導通控制器的設計基礎，可有效地提升轉換器在輕載的效率。脈衝寬度調節(PWM)轉換器使用模式控制器在負載為10-mA時可提升36.14%效率。而高速轉換器則是提升轉換器切換頻率至50-MHz，將被動元件縮小至10-nH電感與100-nF電容，而這個高速轉換器具有快速的暫態響應，時間分別是從重載到輕載的47-ns與從輕載到重載的279-ns。為了在雙相位全整合型直流對直流轉換器的高切換頻率下減少切換損耗且維持輕載效率，在其中加入自動適應非連續導通控制器與低振幅/全振幅緩衝器。而為了增加輸出功率與降低輸出漣波，轉換器中也加入第二個相位與相位控制器。使用GIPD與CMOS兩種晶片互相做三維堆疊的技術可以有效地降低系統的大小。加入自動適應非連續導通控制器與低振幅/全振幅緩衝器可使這個轉換器在負載為10-mA時比之前提出使用GIPD製程的轉換器高出15%的轉換效率。這次提出的轉換器在負載為400-mA時有79.09%的最高效率，比之前提出的高出5%。而此轉換器的最大輸出功率為720-mW，模擬時最大切換頻率為70-MHz，量測時為50-MHz。而此轉換器所使用的被動元件大小為兩個6-nH的電感與一個15-nF的電容。
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