以標準0.18μm CMOS製程製作低功率及低輸入電壓脈寬調變升壓轉換器

Abstract

本篇論文主要是為用無線功率傳輸的於生物之飛行器的感測平台作供電設計。使用無線功率座位輸入源會遇到低功率及低輸入電壓的問題，此篇論文的DC-DC升壓轉換器主要是將低輸入0.5V電壓源升壓至1.8V。DC-DC 升壓轉換器升壓轉換器使用電晶體電路以達到二極體的功用，可以減少導通時的跨壓及不需要電流偵測電路，可以減少電路設計的複雜度。此篇論文使用TSMC標準0.18m CMOS製程設計，晶片面積為1.2 x 1.2 mm2，在0.5V輸入電壓時，模擬的輸出電壓可達1.88V 且效率為78.1%。晶片量測輸出電壓為1.4V，效率為2.14%-5.15%。推測輸出電壓較低及效率較低的原因為PMOS汲極處電壓震盪導致PMOS無法正常開關，電感電流流經body diode，造成能量上的損耗。

This paper designs a power supply for the sensing platform of living IoT using wireless power transmission. The DC-DC boost converter in this paper mainly boosts the low input voltage source of 0.5V to 1.8V for a sensing platform. The DC-DC boost converter uses a transistor circuit to achieve the function of a diode, which can reduce the cross-voltage when conducting. It does not require a current detection circuit, which can reduce the complexity of circuit design. This paper uses a standard TSMC 0.18μm CMOS process design, and the chip size is 1.2 x 1.2 mm2. At a 0.5V input voltage, the simulated output voltage can reach 1.883V and the efficiency is 78.1%. The measured output voltage is 1.4V, and the efficiency of the chip is 2.14%-5.15%. It is speculated that the reason for the lower output voltage and low efficiency is that the voltage oscillation at the PMOS drain causes the PMOS to fail to switch normally, and the inductor current flows through the body diode, causing power loss.