A low-noise charge sensitive preamplifier for Ge spectroscopy operating at cryogenic temperature in the GERDA experiment

Front-end electronics for ionizing radiation detectors signal read-out must sometimes operate at cryogenic temperatures. The classical solution based on cold input transistor and subsequent warm electronics is sometimes not suitable due to the physical constraints of the experimental setup, so the entire front-end circuit has to operate at cryogenic temperature. The proposed multi-channel charge sensitive preamplifiers ("CC2") have been tested in the framework of the GERDA experiment (GERmanium Detector Array), in connection to High-Purity Germanium (HPGe) detectors and are able to operate at cryogenic (liquid Nitrogen) temperature. The results obtained during preliminary tests with an encapsulated Germanium detector and subsequently with naked Germanium detectors are all within the specifications of the GERDA experiment for Phase-I.