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Unformatted text preview: substrate doping of 10 17 cm-3 . The flat band voltage is -0.98 V. There is no interface charge in the oxide. (a) What is the threshold voltage for strong inversion? (b) Draw the band diagrams at the flat band condition and at the threshold condition. (c) Calculate the total MOS capacitance (per area) at the threshold condition. Solutions: (a) 42 . ln = = i a B n N q kT ψ V V 98 . − = fb V 83 . 97 . 84 . 98 . ) 2 ( 2 2 = + + − = + + = ox B a si B fb t C qN V V ψε V. (b) (c) 104 . ) 2 ( 2 = = a B si dm qN W μ m si dm ox W C C ε + = 1 1 min F/cm 7 min 10 63 . − × = C 2...
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- Spring '09
- Semiconductors, P-n junction, Threshold voltage