Design optimization of a fully integrated charge-pump with LC tank oscillator for ultra-low voltage energy harvesting

详细信息    查看全文

• 作者：H.M.P.C. Jayaweera^a ; ^{pradeep.jayaweera@metu.edu.tr} ; Ali Muhtaroğlu^a ; ^b ; ^{amuhtar@metu.edu.tr}
• 关键词：Low voltage DC-DC ; İntegrated step-up ; Energy harvester interface ; Micro-power generator ; LC oscillator
• 刊名：Microelectronics Journal
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：59
• 期：Complete
• 页码：33-39
• 全文大小：1585 K
• 卷排序：59

文摘

Model based optimization of a novel integrated interface circuit topology is presented for low voltage DC-DC step-up conversion. A cross-coupled charge pump is implemented in standard 0.18 µm CMOS technology using an integrated LC tank oscillator to enable a compact, low cost, self-starting solution with maximum efficiency at ultra-low input voltage levels available from embedded micro-power generators. The voltage doubling oscillator can start up with input as low as 0.10 V. Full system can step 0.2 V up to 1.7 V to supply >400 μW to 6 kΩ load with 46.5% efficiency based on post-layout simulations. The minimum simulated input voltage is 0.11 V, which is boosted up to 1.0 V under open circuit conditions. The optimized system thorough the established model improves output power and efficiency more than 30% compared to the alternatives. The compact LC tank leads to 17% area reduction compared to the conventional VCO with four planar inductors.