Re: Comparator
Increasing DC gain can be done by several approaches... it is actually a tradeoff of different spec you have to filled.
In your case, you need another DC gain of about 1k. Probably try cascoded transistors or gain boosting to increase the output resistance of the first stage. Cascoded transistors will increase your DC Gain by gm*ro; Gain boosting will increase your DC gain by A*gm*ro. In both case, the tradeoff will be a smaller output swing on the first stage; fortunately, it is the first gain stage, so a smaller output swing should not hurt.