The following is the summary of my work in the week of Nov 29 - Dec 05. 

	1. Together with Sasank, settled down the problem to be addressed
	   in the next DAC submission. Read corresponding stype papers, 
           such as from Ken Yang. 

	2. Designed a simple Op amp which can do integration and can be  
           used to build the feedback control for PWM DC/DC converters.

	3. Re-implemented the voltage comparator and significantly improved 
           the speed of the voltage comparator. 
