Ramage linked with up Palace in pre-season and has been rewarded with a one-year deal after impressing boss Dougie Freedman.
The 28-year-old took in a loan spell with the Eagles last season and is delighted to have secured a return to Selhurst Park.
Ramage (on Twitter): "Finally put the old autograph to paper on permanent deal at #cpfc. Couldn't be more happy to be back at eagles, can't wait for season...."