GERDA collaboration (114 authors)Barros, N.2019-02-042019-02-042015-06-09http://dx.doi.org/10.1140/epjc/s10052-015-3409-6http://hdl.handle.net/10400.26/26781An optimized digital shaping filter has been developed for the Gerda experiment which searches for neutrinoless double beta decay in$^{76}$ Ge. The Gerda Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) corresponding to 10 % at the $Q$ value for $0\nu \beta \beta $ decay in$^{76}$ Ge is obtained. This is possible thanks to the enhanced low-frequency noise rejection of this Zero Area Cusp (ZAC) signal shaping filter.engjournal article2019-02-04