ECE 124d/256cHomework 3Due: Wed Jan. 27, 2010Reading: Buffer Paper (on line)Problems: (Note, these problems are a bit deeper than previous ones -- start earlier to size them upand describe any simplifying assumptions you make.)1. The repeater optimization proposed by Bakoglu was based on a simple model of a driver inwhich the output capacitance of the driver is ignored. If the output capacitance is proportional tothe driver size e.g. Cout=αW for a given driver width, find a new optimal delay, size and spacingrule.2. In the buffer paper, it is noted that inverter pairs (i.e. non-inverting buffers) seem to have betterjitter behavior than do simple inverters. On the other hand, they are slower. Quantify the differ-ence in performance by finding time optimal solutions for driver sizing and spacing as follows:a. assuming minimum length, let the width of the first and second buffers be a and b respectively.Find an expression for the total delay given a,b, spacing and the wire parameters.
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