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A Low-Dropout Regulator Integrated With E-mode IGZO and D-mode ITO/IGZO Dual Layer Thin Film Transistors With Superior Uniformity and Stability
In this work, an oxide-semiconductor-based low dropout regulator (LDO) circuit with enhancement- (E-) and depletion-mode (D-mode) thin film transistors (TFTs) is demonstrated. The E-mode TFTs adopt IGZO as the active layer. The D-mode TFTs are achieved via the ITO/IGZO dual-layer channel with high f...
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Published in: | IEEE electron device letters 2024-11, Vol.45 (11), p.2134-2137 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | In this work, an oxide-semiconductor-based low dropout regulator (LDO) circuit with enhancement- (E-) and depletion-mode (D-mode) thin film transistors (TFTs) is demonstrated. The E-mode TFTs adopt IGZO as the active layer. The D-mode TFTs are achieved via the ITO/IGZO dual-layer channel with high field effect mobility of 32.7 cm2V−1s−1 and superior uniformity and stability. Its threshold voltage (Vth) generates a positive shift of only 0.22V after positive bias stress. Besides, the D-mode TFTs own a low temperature coefficient of −4.9 mV/°C for Vth, facilitating the design of voltage reference. Benefiting from the remarkable D-mode TFTs, the LDO shows excellent performance, including a line regulation of 0.2%/V, a low quiescent current of 7~\mu A, and a load regulation of 180~\mu V/ \mu A. It has a high power supply rejection ratio (PSRR) of up to 45 dB and a unit gain bandwidth of over 100 kHz. |
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ISSN: | 0741-3106 1558-0563 |
DOI: | 10.1109/LED.2024.3456861 |