A new approach to the front-end readout of cryogenic ionization   detectors
  We present a novel approach to the readout of ionization detectors. The solution allows to minimize the number of components and the space occupation close to the detector. This way a minimal impact is added on the radioactive background in those experiments where very low signal rates are expected, such as GERDA and MAJORANA. The circuit consists in a JFET transistor and a remote second stage. The DC feedback path is closed using a diode. Two signal cables are only necessary for biasing and readout. 
C.Cattadori, B.Gallese, A.Giachero, C.Gotti, M.Maino, G.Pessina
physics.ins-det