How to use people picker value in sharepoint caml query to filter list data

Hi,

in my sharepoint 2010 webpart i wanted to search data from a custom list.i wanted to get the items created by a perticular user in between perticular dates,i am able to do query with two dates, but i wanted to include people picker value also. so how to use people picker value in caml query to filter the data.
can any one provide a entire caml query for this filtering.

Thanks
Ginnas