An article that may be of use to class-e (wasn't sure of where to post it though) see this web site
http://www.geocities.com/zl2pd/
under the DDS VFO (if a scan of article is required I do have one but don't know how to post it)
Stu
Class E AM Forum
This forum is for technical support and general questions about building and operating Class E-AM transmitters.