Analog Circuits With High-Gain Topologies Using a-GIZO TFTs on Glass

Elvira Maria Correia Fortunato, Pedro Miguel Cândido Barquinha, Rodrigo Ferrão de Paiva Martins, Pydi Ganga Bahubalindruni, Bruno Silva, Vitor Grade Tavares, Nuno Cardoso, Pedro Guedes De Oliveira

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31 Citations (Scopus)


This paper presents analog building blocks that find potential applications in display panels. A buffer (sourcefollower), subtractor, adder and a high-gain amplifier, employing only n-type enhancement amorphous Gallium-Indium- Zinc-Oxide thin-film transistors (a-GIZO TFTs), were designed, simulated, fabricated and characterized. Circuit simulations were carried out using a neural model developed in-house from the measured characteristics of the transistors. The adder-subtractor circuit presents a power consumption of 0.26mW, and the amplifier presents a gain of 34 dB and a power consumption of 0.576mW, with a load of 10M //16 pF. To the authors knowledge, this is the highest gain amplifier with a-GIZO TFT technology till date. Simulation results are in agreement with the measured circuit response.
Original languageEnglish
Pages (from-to) 547-553
JournalJournal Of Display Technology
Issue number6
Publication statusPublished - 2015


  • Analog circuits
  • a-GIZO TFT
  • neural modeling


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