# ece hw9 - How long will it take for v x to rise to 4 V...

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1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2010 Homework 9 Do the following problems: 10.38* and 10.50 Sedra and Smith and the problems below. You must turn all the * problems for credit Wednesday December 10 (1)* In Figure 10.19 a of Sedra and Smith, what should (W/L) p be in order to have V o = 0.1 V when V I is set to V DD . Assume V DD = 2.5V, |V t | = 0.4V, k n ’ = 4k p ’ = 120 uA/V 2 , (W/L) n = (.375/.25). What is the static power dissipation? (2)* In the PMOS circuit below K p = 100 uA/V 2 , V tP = -1 V. The voltage v x is zero at t = 0.
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Unformatted text preview: How long will it take for v x to rise to 4 V? There is no body effect in this problem. (3)*In the NMOS circuit below, μ n C ox = 100 uA/V 2 , V t = 1 V, γ =0.5 V 1/2 , 2 φ f = 0.6 V. At t = 0, the capacitor has zero charge on it so v y (0) = 0. (a) Neglecting the body effect, find the voltage v y after a long time has passed. (b) Neglect the body effect and find the minimum value of W/L that will cause v y to rise from 0 V to 1 V in no more than 0.1 nS. (c) repeat part (a) but include the body effect. v x +5v +5v +2v +-1 pF +-v y +5v +3v 1 pF...
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