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. 2018 Jun 12;8(1):8980.
doi: 10.1038/s41598-018-27205-7.

Printed 5-V organic operational amplifiers for various signal processing

Hiroyuki Matsui  1 , Kazuma Hayasaka  2 , Yasunori Takeda  2 , Rei Shiwaku  2 , Jimin Kwon  3 , Shizuo Tokito  4
Affiliations

Printed 5-V organic operational amplifiers for various signal processing

Hiroyuki Matsui et al. Sci Rep. .

Abstract

The important concept of printable functional materials is about to cause a paradigm shift that we will be able to fabricate electronic devices by printing methods in air at room temperature. One of the promising applications of the printed electronics is a disposable electronic patch sensing system which can monitor the health conditions without any restraint. Operational amplifiers (OPAs) are an essential component for such sensing system, since an OPA enables a wide variety of signal processing. Here we demonstrate printed OPAs based on complementary organic semiconductor technology. They can be operated with a standard safe power source of 5 V with a minimal power consumption of 150 nW, and used as amplifiers, a variety of mathematical operators, signal converters, and oscillators. The printed micropower organic OPAs with the low voltage operation and the high versatility will open up the disposable electronic patch sensing system in near future.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Device structure, photographs and transistor characteristics. (a) Schematics of the device structure. (b) Transfer and (c) output characteristics of p- and n-type organic transistors. (d) Circuit diagram of the organic operational amplifiers (OPAs). CUR terminal was connected to VSS via an external current source or a resistor. (e) Optical microscope images of the organic OPAs. (f) Photograph of the organic OPAs mounted on a dual inline package (DIP).
Figure 2
Figure 2
Open-loop DC characteristics of the organic OPAs. (a) Comparison of two types of organic OPAs with single-gate and dual-gate n-type OFETs. The geometry of p-type OFETs is single gate for both OPAs. (b) Organic OPA characteristics at various VIN− voltages.
Figure 3
Figure 3
Closed-loop DC characteristics of the organic OPAs. (a) The circuit diagram and (b) the characteristics of the voltage follower. (c) The circuit diagram and (d) the characteristics of the non-inverting amplifier. The resistance R1 was fixed at 100 MΩ. (e) The dependence of closed-loop gain on R2 for the non-inverting amplifiers. Dashed line indicates the calculation based on Eq. 2 with an open-loop gain of 30.
Figure 4
Figure 4
Frequency characteristics of the organic OPAs. Frequency dependence of the small-signal gain and phase for the open-loop organic OPA and the closed-loop non-inverting amplifier. R1 = 100 MΩ and R2 = 500 MΩ was used for the non-inverting amplifier. Dashed lines indicate the simulation curve by using the LTspice software.
Figure 5
Figure 5
A variety of signal processing by the organic OPAs. (a) Integrator. (b) Differentiator. (c) Current-to-voltage converter (transimpedance amplifier). (d) Triangular oscillator and pulse width modulator.
See this image and copyright information in PMC

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