Investigation of voltage-controlled oscillator circuits using organic thin-film transistors (OTFT) for use in VCO-based analog-to-digital converters

Ganesan, Ramkumar; Krumm, Jürgen; Ludwig, Klaus; Glesner, Manfred

doi:10.1016/j.sse.2013.12.002

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Thus, analog-to-digital signal conversion is a key functional block for printed electronics. Voltage-controlled oscillators (VCOs) are key components of VCO-based analog-to-digital converters (ADCs). , There have been a few reports on organic-transistor-based ADCs; − however, most of these were not based on printed semiconductors. In this paper, we report the realization of voltage-controlled double-gate complementary ring oscillators (ROSCs) utilizing inkjet printed semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Voltage-Controlled Ring Oscillators Based on Inkjet Printed Carbon Nanotubes and Zinc Tin Oxide

Kim

Park

Geier

et al. 2015

ACS Appl. Mater. Interfaces

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A voltage-controlled ring oscillator is implemented with double-gate complementary transistors where both the n- and p-channel semiconductors are deposited by inkjet printing. Top gates added to transistors in conventional ring oscillator circuits control not only threshold voltages of the constituent transistors but also the oscillation frequencies of the ring oscillators. The oscillation frequency increases or decreases linearly with applied top gate potential. The field-effect transistor materials system that yields such linear behavior has not been previously reported. In this work, we demonstrate details of a material system (gate insulator, p- and n-channel semiconductors) that results in very linear frequency changes with control gate potential. Our use of a double layer top dielectric consisting of a combination of solution processed P(VDF-TrFE) and Al2O3 deposited by atomic layer deposition leads to low operating voltages and near-optimal device characteristics from a circuit standpoint. Such functional blocks will enable the realization of printed voltage-controlled oscillator-based analog-to-digital converters.

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Section: Introductionmentioning

confidence: 99%

Voltage-Controlled Ring Oscillators Based on Inkjet Printed Carbon Nanotubes and Zinc Tin Oxide

Kim

Park

Geier

et al. 2015

ACS Appl. Mater. Interfaces

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“…One of the most important organic molecular components, especially aromatic molecules, is the benzene ring structure, which is found in a number of organic semiconductor materials and organic electroluminescence (EL) materals. [14][15][16][17][18][19][20][21] The benzene ring is composed of six carbon atoms and six hydrogen atoms with delocalized ³-electrons. We can predict the chemical bonding structures in the deposited film, when the deposition using benzene can be clarified.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hydrocarbon components generated in deuterated benzene plasma studied by in situ real-time infrared absorption spectroscopy

Shinohara¹,

Taniguchi²,

Takaki³

et al. 2014

Jpn. J. Appl. Phys.

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In situ, real-time infrared absorption spectroscopy in the multiple internal reflection geometry was employed to investigate the evolution of hydrocarbon components deposited during plasma-enhanced chemical vapor deposition with a deuterated benzene source. We detected a peak attributed to the C-D stretching vibration of the deuterated phenyl group, which indicated a mode in which the benzene ring structure is retained on the substrate during the adsorption. The evolution of each peak during the plasma exposure suggests that the addition reaction occurs during the adsorption. Furthermore, we observed that with increasing substrate bias applied, the benzene ring structures in the film were disrupted and the amount of alkane components increased. This addition reaction proceeded on the film surface, regardless of the substrate bias.

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“…It is compatible with single-gate TFT technologies and does not require external control signals. Unlike those in [6], [7], and [9], the supply voltage of our VFC remains constant during operation because it is not controlled by the input signal, and this helps reduce the power consumption. Also, thanks to the use of Schmitt trigger, our work can provide almost full-swing output (99% Vdd).…”

Section: Vfc Performancementioning

confidence: 99%

“…Recently, several thin film transistor (TFT)-based VFC designs have been reported, including the back gate control structure [5], the ring oscillator (RO) structure [6], [7], the relaxation oscillator structure [8], and the LC oscillator based structure [9]. Concepts of these circuits are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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An Integrator and Schmitt Trigger Based Voltage-to-Frequency Converter Using Unipolar Metal-Oxide Thin Film Transistors

Zhong

et al. 2021

IEEE J. Electron Devices Soc.

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Investigation of voltage-controlled oscillator circuits using organic thin-film transistors (OTFT) for use in VCO-based analog-to-digital converters

Cited by 8 publications

References 17 publications

Voltage-Controlled Ring Oscillators Based on Inkjet Printed Carbon Nanotubes and Zinc Tin Oxide

Voltage-Controlled Ring Oscillators Based on Inkjet Printed Carbon Nanotubes and Zinc Tin Oxide

Adsorption of hydrocarbon components generated in deuterated benzene plasma studied by in situ real-time infrared absorption spectroscopy

An Integrator and Schmitt Trigger Based Voltage-to-Frequency Converter Using Unipolar Metal-Oxide Thin Film Transistors

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