NDLI: Low-power buffer with voltage boosting and improved frequency compensation for liquid crystal display source drivers

Content Provider	IET Digital Library
Author	Liu, Pang Jung Ting, Chung Yi
Abstract	A pair of complementary class-A buffers with voltage boosting method and improved frequency compensation is proposed. The buffer driving capabilities are enhanced by adding small auxiliary transistors to pull-up/pull-down the gate voltages of the buffer output transistors to improve the transient response. The auxiliary transistors are turned off for power saving in the steady-state operation. The proposed frequency compensation is more area-efficient than the Miller compensation method and hence maintains the high output voltage slew rate of the buffer. The measured static current of each buffer with the proposed circuits consumes 3 μA under a supply voltage of 5 V. The buffer settling times of the rising and the falling edges with a capacitance of 600 pF for an input swing of 5 V are 3.3 and 1.7 μs, respectively. The core size of the buffers including the compensation capacitance is 82 × 101 µm2 and the buffer can be stable when a load capacitance changes from 5 to 600 PF. Hence, the proposed output buffers concurrently achieve a fast response and are suitable for a wide range of load capacitances.
Starting Page	263
Ending Page	271
Page Count	9
ISSN	1751858X
Volume Number	8
e-ISSN	17518598
Issue Number	Issue 4, Jul (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/8/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2013.0334
Journal	IET Circuits, Devices & Systems
Publisher Date	2014-02-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Buffer Circuit Capacitance 5 PF to 600 PF Compensation Complementary Class-A Buffers Current 3 MuA Driver Circuit Frequency Compensation High Output Voltage Slew Rate Liquid Crystal Device Liquid Crystal Display Source Driver Liquid Crystal Displays Load Capacitances Low Power Electronics Low-power Buffer Miller Compensation Method Power Electronics Power Supply Small Auxiliary Transistors Steady-state Operation Supervisory Circuit Time 1.7 Mus Time 3.3 Mus Transient Response Voltage 5 V Voltage Boosting Method
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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