PROJECT TITLE :

a-InGaZnO Thin-Film Transistor-Based Operational Amplifier for an Adaptive DC–DC Converter in Display Driving Systems

ABSTRACT:

In this paper, we present an operational amplifier (op-amp) and a pulsewidth-modulation (PWM) controller fabricated with amorphous indium–gallium–zinc oxide thin-film transistors (a-InGaZnO TFTs), to build an adaptive dc–dc converter for show driving systems. The fabricated a-InGaZnO TFT presents electrical characteristics suitable for accomplishing an op-amp composed solely with n-type TFTs to have an overall gain of 24.five dB, a cutoff frequency of half-dozen kHz, and a unit gain frequency of 32 kHz operating at ±15 V. The fabricated op-amp is used to construct a comparator and a slip amplifier on the glass, which are combined to realize a PWM controller. The ensuing PWM controller will successfully management the output voltage of an external dc–dc converter that follows the input voltage to the error amplifier, and can operate at one hundred Hz to manage the duty ratio from 24.3% to 66.one% when the reference voltage varies from 2 to six V, respectively.


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