Enhancement of Closed-Loop Gain of Organic Amplifiers Using Double-Gate Structures

Sunghoon Lee, Amir Reuveny, Naoji Matsuhisa, Robert Nawrocki, Tomoyuki Yokota, Takao Someya

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We demonstrate a significant improvement in the gain of closed-loop organic amplifiers by systematically controlling the threshold voltage ( VTH with double-gate structures. The use of an ultrathin parylene dielectric results in an operating voltage as low as 4 V with a supply voltage ( VDD of 2 V. Double-gate structures were introduced for controlling VTH of the transistor and the switching voltage of the inverter. The maximum dc gain of the inverter was recorded as 29.3 dB at a VDD value of 2 V. In addition, the switching voltage of the circuits can be controlled from 0 V to VDD without a significant performance degradation. The effects of the VTH control on the closed-loop amplifier were systematically investigated and a significant gain improvement of up to 18.8 dB was demonstrated in the closed-loop gain by adjusting the switching voltage to half of VDD.

Original languageEnglish
Article number7452547
Pages (from-to)770-773
Number of pages4
JournalIEEE Electron Device Letters
Issue number6
Publication statusPublished - 2016 Jun
Externally publishedYes


  • Organic amplifiers
  • closed-loop amplifier
  • double gate structure
  • organic thin-film transistors
  • threshold voltage control

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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