A 90.5%-Efficiency 28.7µVRMS-Noise Bipolar-Output HighStep-Up SC DC-DC Converter with Energy-Recycled Regulation and Post-Filtering for ±15V TFT-Based LAE Sensors

📋 论文概要

本文提出了一种用于大面积电子TFT栅极驱动的高升压双极输出开关电容DC-DC转换器，通过能量回收调节技术实现了90.5%的高效率和28.7µV RMS的低输出噪声，解决了传统转换器噪声和纹波耦合到读出AFE的问题。

💡 主要创新点

• 提出能量回收调节（Energy-Recycled Regulation）技术，在维持高升压比的同时回收部分能量，提升效率。
• 通过优化开关电容结构和控制策略，将输出噪声降低至28.7µV RMS，满足高SNR传感器应用需求。
• 实现双极输出（±15V）且无需额外LDO，简化了系统设计并降低了功耗。

🏷 关键词

📄 原文摘要

The applications of large-area electronics (LAEs) based on thin-film transistors (TFTs) are rapidly expanding from displays to sensors. For the TFT gate drivers, high-voltage bipolar supply rails (approximately ±15V) are required; so far, they have been typically generated from a battery (VBAT) by employing switched-capacitor converters (SCCs) [1]. Since a high SNR is crucial for TFT-based sensors such as an under-display fingerprint sensor [2], the noise and ripple of the SCC output, which are prone to be coupled to the readout AFE, should be minimized. As a straightforward method, an LDO can be utilized as a post-regulator in series with the SCC. However, the relatively large dropout voltage (VDO) of the LDO significantly degrades the efficiency [3]. In contrast, small VDO reduces LDO loop-gain due to the pass-transistor working in the triode region, resulting in decreased supply-ripple rejection (PSR). From the perspective of SCC, owing to its fixed

👥 作者与机构

Min-Woo Ko, Hyunki Han, Hyun-Sik Kim

KAIST, Daejeon, Korea