Design and Implementation of N-Type-Only LTPS-TFT Voltage Reference Circuits for Flexible Electronics

This paper details the design and simulation-based evaluation of three distinctN-type-only low-temperature polycrystalline silicon thin-film transistor (LTPS-TFT) voltage reference circuits, tailored for the specific demands of flexible electronic systems. Addressing the inherent design challenges in TFT technology, these circuits employ a common strategy: generating a current with a negative temperature coefficient to compensate for proportional-to-absolute-temperature (PTAT) voltage characteristics. Comprehensive post-layout and statistical Monte Carlo simulation results highlight that the first of the proposed configurations achieves superior performance, exhibiting a temperature coefficient (TC) of 34.03 ppm/°C, a line sensitivity of 0.61 %/V, and a power supply rejection ratio (PSRR) of -42.34 dB. This study presents new circuit-level approaches for achieving reliable voltage references in flexible applications, thereby advancing the development of high-performance, flexible electronic systems.