Some PCB design software, such as ACE 3000, support the conversion of schematics data saved in DXF/DWG format to some of the gerber data formats, including the generic .gerber files. There are many gerber files used, so you may want to pick some specific gerber extension for more refined results.
Convert AutoCAD DXF Drawing Exchange Format to Printed circuit board photoplotter file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert dxf to gerber on Windows
A CAD and Gerber conversion software
Convert from dxf file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.