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A 1.46mm2 Simultaneous Energy-Transferring Single-Inductor Bipolar-Output Converter with a Flying Capacitor for Highly Efficient AMOLED Display in 0.5μm CMOS

Hong, Sung-Wan
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Institute of Electrical and Electronics Engineers Inc.
Digest of Technical Papers - IEEE International Solid-State Circuits Conference, v.2020-Febru, pp.200 - 202
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Digest of Technical Papers - IEEE International Solid-State Circuits Conference
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As the interaction with users becomes more important, AMOLED displays are being more widely used in various electronic devices. As the display is one of the modules that consumes the largest portion of the power in electronic devices, displays must be designed to operate with a higher efficiency to improve a battery longevity. As a means of supplying power to such displays, DC-DC converters and their performance are important. Along with high efficiency, a DC-DC converter should provide quiet supply voltages for the display to avoid light fluctuation [1]. For this reason, many devices use two separate DC-DC converters, boost and inverting buck-boost converters, to generate a positive (V op ) and a negative (V on ) output voltage, respectively [2], as shown in top-left of Fig. 11.6.1. Although this structure is advantageous for making quiet output voltages owing to its two-phase operation, it is not cost effective because it uses two inductors. In the single-inductor bipolar-output (SIBO) converter shown in top-right of Fig. 11.6.1, V op and V on are generated by using one inductor [3]. However, the SIBO converter operates with three phases, the build-up phase, V op transferring phase, and V on transferring phase, to regulate each output voltage. Therefore, the energy transferring time for each output is shorter than that of the structure in [2]. As a result, its output voltage has a large ripple. The efficiency of a SIBO converter with a flying capacitor increases by reducing the ripple of the inductor current (j L ) [4]; however, the energy transferring time for each output is still short. Although each output can be separately controlled to optimize the output voltage ripple [5], the operation is still based on the three phases.
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