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Sub-threshold MOSFET Operation - MIT OpenCourseWare

0 iD K(vGS VT with K (W/ L) - Microelectronic Devices and Circuits Lecture 12 - Sub-threshold MOSFET Operation - Outline Announcement Hour exam two: in 2 weeks, Thursday, Nov. 5, 7:30-9:30 pm ALSO: sign up for an iLab account!! Review MOSFET model: gradual channel approximation (Example: n-MOS) for (vGS VT)/ 0 vDS (cutoff) K(vGS VT)2 /2 for 0 (vGS VT)/ vDS (saturation) vDS/2) vDS for 0 vDS (vGS VT)/ (linear) **Cox , VT= VFB 2 p-Si + [2 Si qNA(|2 p-Si| vBS)]1/2/Cox and = 1 + [( Si qNA/2(|2 p-Si| vBS)]1/2 /Cox (frequently 1) The factor : what it means physically Sub-threshold Operation - qualitative explanation Looking)

GS = V FB, v BS = 0. and v DS > 0: n+ p n+ v GS = V FB G v DS > 0-t S D ox 0 t n+ y v BS = 0 B x y 0 L -So far this is standard MOSFET operating procedure. We could apply a positive voltage to the gate and when it was larger than V T we would see the normal drain current that we modeled earlier. Rather than do this, however, consider forward ...

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