Paper Info
Title
A 90.5%-Efficiency 28.7 Mu V-Rms-Noise Bipolar-Output High-Step-Up Sc Dc-Dc Converter With Energy-Recycled Regulation And Post-Filtering For +/- 15v Tft-Based Lae Sensors
Abstract
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 $(V_{BAT})$ 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 $(V_{DO})$ of the LDO significantly degrades the efficiency [3]. In contrast, small V DO 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 voltage conversion ratio (VCR), the V DO cannot be finely regulated over a wide variation of V BAT . For fine regulation, the complexity (cost) overhead or the power loss will increase in the SC circuit. In this work, an energy-recycled optimal V DO control (EROC) technique in the SC bipolar step-up stage is proposed for higher efficiency. Also, load-current-reused (LCR) post-regulator is presented to achieve high PSR while extremely minimizing the power loss at the pass-transistor.
Year
DOI
Venue
2021
10.1109/ISSCC42613.2021.9365935
2021 IEEE INTERNATIONAL SOLID-STATE CIRCUITS CONFERENCE (ISSCC)
DocType
Volume
ISSN
Conference
64
0193-6530
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Min-Woo Ko101.35
Hyun-Ki Han200.68
Hyunsik Kim3264.89