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Homework 04

# Homework 04 - EE115C,Winter2009,HW#4(due Problem 1(Inverter...

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EE 115C, Winter 2009, HW #4 (due 2/18/2010) Problem 1: (Inverter Power Consumption) For the circuit in Figure 1, assume that the input V in is a periodic square wave signal (called “clock”) of frequency 400 MHz, and has a rising transition time (from 10%-90% of V DD ) of 0.4 ns and a falling transition time (from 90%-10% of V DD ) of 0.4 ns. Suppose that V DD = 1.0 Volts, C GN ’ = C GP ’ = 2.0 fF/ μ m, C DN ’ = C DP ’ = 1.5 fF/ μ m, R N ’ = 1.25 k - μ m, and R P ’ = 3 k - μ m, and the transistors have the following properties: For the first inverter in the figure: a) Find the dynamic (switching) power consumption. b) Find the short circuit power consumption. Assume that the short circuit current pulses are triangular in shape: they peak when V in = V DD /2. Assume also that the peak short circuit cur- rents are equal for rising and falling transitions: I peak_sc_LH = I peak_sc_HL . (Hint: You need to de- termine the short circuit duration, t SC and the peak short circuit current, I peak_sc_LH ; since we assumed that I peak_sc_HL = I peak_sc_LH

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