Ibrahim, N. Y., N. A. D. I. A. H. RAFAT, and S. E. A. Elnahwy, "Drift transport model of field effect transistors in saturation beyond cutoff", Journal of Physics D: Applied Physics, vol. 48, no. 13: IOP Publishing, pp. 135102, 2015. Abstract

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Ibrahim, N. Y., N. A. D. I. A. H. RAFAT, and S. E. A. Elnahwy, "Multi-input intrinsic and extrinsic field effect transistor models beyond cutoff frequency", Solid-State Electronics, vol. 103: Pergamon, pp. 236–241, 2015. Abstract
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Ibrahim, N. Y., N. A. D. I. A. H. RAFAT, and S. E. A. Elnahwy, "Modeling of field effect transistor channel as a nonlinear transmission line for Terahertz detection", Journal of Infrared, Millimeter, and Terahertz Waves, vol. 34, no. 10: Springer US, pp. 606–616, 2013. Abstract
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Ibrahim, N. Y., N. A. D. I. A. H. RAFAT, and S. E. A. Elnahwy, Multi-input intrinsic and extrinsic field effect transistor models beyond cutoff frequency, , vol. 103, pp. 236 - 241, 2015/1//. AbstractWebsite

AbstractThis work expands the classical theory of operation of FETs beyond cutoff frequency. Using an electron drift transport model, the responsivity of a FET working in the linear region of operation within the semi-classical transport region is derived. Different DC circuit configurations are included in the analysis, as well as multiple AC input signals. Separating the model into intrinsic and extrinsic parts enables better analysis of the effect of multiple input AC signals. A new treatment of the concept of symmetry/asymmetry in FETs beyond the cutoff frequency is presented. The origin of symmetry and factors affecting it are analyzed. The effects of asymmetries from various origins within the FET system are taken into account. The analytical results are used to qualitatively explain published experimental results of symmetry points in FET THz detectors.

Ibrahim, N. Y., N. H. Rafat, and S. E. A. Elnahwy, "Modeling of Field Effect Transistor Channel as a Nonlinear Transmission Line for Terahertz Detection", Journal of Infrared Millimeter and Terahertz Waves, vol. 34, issue 10, pp. 606-616, 2013. ijim-s-13-00156_6.pdf

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