Topological comparison of unipolar and complementary digital inverter circuits

Abstract A systematic comparison of the five circuit topologies for thin-film transistor (TFT) based digital inverter (NOT gate) is presented. Exploiting the measured characteristics of a high-performance organic TFT, widely adopted unipolar and complementary inverter circuits are simulated in SPICE. Extraction and analysis of the voltage gain variation, maximum and minimum power consumption at various circuits and driving voltages establishes critical understanding of each characteristic topology. Most importantly, a fair comparison designed and performed on the ground of identical transistors delivers a set of practical information about which circuit has an inherent advantage over the others for a specific target application.