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In-Panel 31.17dB 140kHz 87μW Unipolar Dual-Gate In-Ga-Zn-O Charge-Sense Amplifier for 500dpi Sensor Array on Flexible Displays

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Author: Papadopoulos, N. · Steudel, S. · Roose, F. de · Eigabry, D.M. · Kronemeijer, A.J. · Genoe, J. · Dehaene, W. · Myny, K.
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source:ESSCIRC 2018 - 44th IEEE European Solid State Circuits Conference, ESSCIRC 2018, 3 September 2018 through 6 September 2018, 102-105
Identifier: 843676
ISBN: 9781538654040
Article number: 8494260
Keywords: amoled · amplifier · csa · display · dual gate · igzo · imager · in-panel · metal-oxide · Amplifiers (electronic) · Display devices · Flexible displays · Gallium compounds · Image sensors · Light amplifiers · Light emission · Metals · Zinc compounds · Active matrix organic light emitting displays (AMOLED) · AM-OLED · Direct integration · Dual gates · Fingerprint sensors · Flexible substrate · igzo · Metal oxides · Indium compounds


In this paper a charge sense amplifier (CSA) using a 5μm In-Ga-Zn-O transistor technology on 15μm thick flexible substrate is presented for readout of a 500dpi fingerprint sensor array targeting direct integration with active matrix organic light emitting displays (AMOLED). The CSA achieves a linear input range of 0.8V for rail to rail output at VDD=15V. The CSA comprises of a high gain and stable dual-ended output dual-stage amplifier. The n-type load is driven by a dual-stage buffer and start-up circuit to increase the performance and ensure stability. The amplifier operates down to 6V supply voltage. It achieves 31.17dB DC-gain, 140kHz gain-bandwidth, 53° phase margin and dissipates 87μW at 15V. The footprint of the CSA is 0.3mm2 and enables 1fps readout of 1 megapixel 500dpi sensor array. © 2018 IEEE.