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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 back at Lecture 10 ( Sub-threshold electron charge) Operating an n-channel MOSFET as a lateral npn BJT The Sub-threshold MOSFET gate-controlled lateral BJT Why we care and need to quantify these observations Quantitative Sub-threshold modelingiD, Sub-threshold ( (0)), then iD,s-t(vGS, vDS) [with vBS = 0] Stepping back and looking at the equations Clif Fonstad, 10/22/09 Lecture 12 - Slide 1)

* 1/2 and | 0 i D ≈ K(v GS – V T with K ≡ (W/αL)µ e 6.012 - Microelectronic Devices and Circuits Lecture 12 - Sub-threshold MOSFET Operation - Outline • Announcement

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