A Compact Low-Voltage D-type Flip Flop Using Oxide TFTs and Its Application in Sequential Circuits
Bhawna Tiwari, Pydi Ganga Bahubalindruni
Abstract
This brief presents a low-voltage D-type flip flop (D-FF) and its application in the sequential circuits, namely shift register (SR) and counter. These circuits were fabricated on a 30 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> thick polymide substrate using single-gate indium-gallium-zinc-oxide (IGZO) thin-film transistors (TFTs). The proposed D-FF is designed using only 18 n-type transistors. This circuit has shown almost 100% improvement in frequency of operation compared to state-of-the-artwork from measurements at a low power supply voltage of 4V. In addition, the resulting 6-bit SR and 6-bit counter show expected functionality with the proposed D-FF. These circuits would find potential applications in display drivers and flexible smart sensing systems.