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Prabhakaran, G.
- Design and Analysis of High Gain, Low Power and Low Voltage a-Si TFT based Operational Amplifier
Authors
1 Faculty of Electronics and Communication, Sathyabama University, Chennai-600119, Tamil Nadu, IN
2 Jeppiaar Institute of Technology, Sriperumbudur, Kanchipuram District, Kunnam-631604, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 8, No 16 (2015), Pagination:Abstract
This paper investigates on the design of two stage Operational Amplifier (Op-Amp) with NMOS input at differential stage. This low power Op-Amp designed with Amorphous Silicon Thin Film Transistor (a-Si TFT) and MOS transistor. It is observed that the newly designed TFT Op-AMP operates in low voltage at 3V DC, with high gain, high output impedance and high phase margin and moderate power dissipation. A detailed design procedure is carried-out to design the proposed Op-Amp. HSPICE Circuit Simulator is used for simulation. Obtained results are compared with CMOS Op-Amp which uses the same circuit and design procedure. The output behavior of TFT Op-Amp is also compared with the existing work showing good agreement.Keywords
Amorphous Silicon, CMOS, High Stability, Low Power, Operational Amplifier, Thin Film TransistorFull Text
- Analysis and Modeling of Hybrid Operational Amplifiers Using Amorphous Silicon Thin Film Transistor
Authors
1 Sathyabama University, Chennai-600118, Tamilnadu, IN
Source
Programmable Device Circuits and Systems, Vol 3, No 12 (2011), Pagination: 698-704Abstract
A new technique is presented in this paper for the design of a Hybrid TFT operational amplifier made by morphous Silicon thin film transistor and MOSFET which operates at 3V power supply. The OPAMP designed is a two-stage Hybrid TFT OPAMP followed by an output buffer. This Operational Amplifier employs a Miller capacitor and is compensated with a current buffer compensation technique. The unique behaviour of the MOS transistors in saturation region not only allows a designer to work at a low voltage, but also at high frequency. Designing of two-stage op-amps is a multi-dimensional-optimization problem where optimization of one or more parameters may easily result into degradation of others. As compared to the conventional approach, the proposed hybrid operational amplifier result in a higher unity gain amplifier under the same load condition. In this paper we analyze the results of non-inverting amplifier, inverting amplifier, differential amplifier, differentiator and integrator of hybrid operational amplifier, using simulation with Integrated Circuit Emphasis (HSPICE).
