Download EECS 141 Spring 1999 Midterm 2: Electronic Circuits Questions and more Exams Electrical Engineering in PDF only on Docsity!
EECS 141, Spring 1999
Midterm 1
Professor Neureuther
I. Static Analysis
1a) (20 pts) Set up an equation for Vout and solve for Vout to an accuracy of 0.2 volts when Va = 3V and Vb = 5V.
1b) (20 pts) Find the minimum value of (W/L)p such that when Va = 5V and Vb = 0V, the output voltage (including the 100 uA current) will be less than or equal to 1.5V. Note that both Va and Vb have changed from part a.
II. Transient Analysis of CMOS
Rpmos = 30 kohms / (W/L)p Rnmos = 10 kohms / (W/L)n For each source or drain Cdbp = 1.0 fF x (W/L)p Cdbn = 1.5 fF x (W/L)n
2a) (15 pts) Assuming the only capacitance present is Cl, find the worst case propagation delay.
2b) (15 pts) Using the Cdbp and Cdbn values given above and the (W/L) sizes shown, find the total internal capacitance which has the possibility of changing voltage.
2c) (10 pts) Find the worst case propagation delay when both Cl and the Cdb internal capacitances are present.
III. CCMOS and Standard Cells
4b) (15 pts) List 5 reasons why t_phl and t_plh can be unequal.
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