CMOS TFT Op-Amps: Performance and Limitations

In this letter, we demonstrate the feasibility of building thin-film transistor (TFT) complementary metal-oxide-semiconductor (CMOS) operational amplifiers (op-amps) at low temperature (180°C) for large-area sensor applications. The classic two-stage Miller-compensated CMOS design is built using a-Si:H and pentacene TFTs. In addition, we have studied the impact of electrical stress-induced aging of TFTs on op-amp performance using two different kinds of biasing circuits.

[1]  J. A. Nichols,et al.  Analog and digital circuits using organic thin-film transistors on polyester substrates , 2000, IEEE Electron Device Letters.

[2]  Kapil Sakariya,et al.  Threshold Voltage Performance of a-Si:H TFTs for Analog Applications , 2003 .

[3]  Liang-Hung Lu,et al.  An Amorphous-Silicon Operational Amplifier and Its Application to a 4-Bit Digital-to-Analog Converter , 2010, IEEE Journal of Solid-State Circuits.

[4]  J.R. Long,et al.  An Assessment of µ-Czochralski, Single-Grain Silicon Thin-Film Transistor Technology for Large-Area, Sensor and 3-D Electronic Integration , 2008, IEEE Journal of Solid-State Circuits.

[5]  Lawrence T. Clark,et al.  Amorphous silicon logic circuits on flexible substrates , 2008, 2008 IEEE Custom Integrated Circuits Conference.

[6]  Henrique L. Gomes,et al.  Dynamics of Threshold Voltage Shifts in Organic and Amorphous Silicon Field‐Effect Transistors , 2007 .

[7]  David A. Johns,et al.  Analog Integrated Circuit Design , 1996 .

[8]  R. Shringarpure,et al.  Circuit-Level Impact of a-Si:H Thin-Film-Transistor Degradation Effects , 2009, IEEE Transactions on Electron Devices.

[9]  Vratislav Michal,et al.  Design of CMOS analog integrated circuits as readout electronics for High-TC superconductor and semiconductor terahertz bolometric sensors , 2006 .

[10]  Compact modeling of amorphous‐silicon thin‐film transistors with BSIM3 , 2008 .

[11]  W.-J. Fischer,et al.  Analog Signal Processing with Organic FETs , 2006, 2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers.

[12]  S. Sambandan,et al.  Self-Stabilization in Amorphous Silicon Circuits , 2009, IEEE Electron Device Letters.

[13]  D. Allee,et al.  51.1: Invited Paper: Flexible CMOS and Electrophoretic Displays , 2009 .