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Improved Body Effect and Analog Characteristics of n-Channel MOSFET With Lateral Asymmetric Substrate Doping

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6 Author(s)
Kee-Yeol Na ; Chungbuk Provincial College, Chungbuk, Korea ; Ki-Ju Baek ; Jun-Kyu Kim ; Dongwon Kim
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An n-channel MOSFET with lateral asymmetric substrate doping (LASD) is presented in this paper. The proposed LASD device has a p-well on the source side and a p-substrate on the drain side. The LASD MOSFET was designed by the simple p-well layout approach and fabricated using the 0.18 μm standard low-voltage CMOS process without any process modification. The experimental measurements showed the improved analog performances of the LASD MOSFET: higher transconductance (gm), lower drain conductance (gds), lower drain induced barrier lowering, higher transconductance generation factor (gm/ID), and higher Early voltage (VEA). In addition, the LASD device showed strong body-effect immunity: smaller VT shift according to body bias and lower body bias sensitivity factor (gmb/gm).

Published in:

IEEE Transactions on Electron Devices  (Volume:61 ,  Issue: 7 )