A New High-Gain Operational Amplifier Using Transconductance-Enhancement Topology Integrated with Metal Oxide TFTs

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Abstract

This paper presents an integrated operational amplifier (OPAMP) consisting of only n-type metal oxide thin-film transistors. In addition to using positive feedback in the input differential pair, a transconductance-enhancement topology is applied to improve the gain of the OPAMP. The OPAMP has a voltage gain (A v ) of 29.54 dB over a 3-dB bandwidth of 9.33 kHz at a supply voltage of 15 V. The unity-gain frequency, phase margin (PM), and dc power consumption (P DC ) are 180.2 kHz, 21.5° PM and 5.07 mW, respectively.

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Chen, Z. J., Xu, W. X., Wu, J. D., Zhou, L., Wu, W. J., Zou, J. H., … Peng, J. B. (2019). A New High-Gain Operational Amplifier Using Transconductance-Enhancement Topology Integrated with Metal Oxide TFTs. IEEE Journal of the Electron Devices Society, 7, 118–126. https://doi.org/10.1109/JEDS.2018.2883585

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