2011
DOI: 10.1088/1748-0221/6/05/p05006
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A new approach to the readout of cryogenic ionization detectors: GeFRO

Abstract: We present GeFRO (Ge Front-end ReadOut) a novel approach to the readout of ionization detectors. The circuit 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. Only two signal cables are necessary for bi… Show more

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Cited by 7 publications
(5 citation statements)
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“…Concerning the feedback components, the values chosen for our prototype are R F = 500 MΩ, C F = 0.9 pF (C F already includes the parasitic contributions due to R F and layout). In the first version of the GeFRO, as reported in [4], [5], only a Schottky diode was used as the feedback element, which served at the same time as the (non linear) large value resistor and capacitor. It was then found difficult to find a Schottky diode with a high degree of radiopurity, while on the contrary Silicon resistors in bare die of high radiopurity were found to be commercially available, with values ranging up to 150 MΩ (MSTF 6SS-15005 J-E from Mini-Systems, Inc.).…”
Section: The Gefro Circuitmentioning
confidence: 99%
See 1 more Smart Citation
“…Concerning the feedback components, the values chosen for our prototype are R F = 500 MΩ, C F = 0.9 pF (C F already includes the parasitic contributions due to R F and layout). In the first version of the GeFRO, as reported in [4], [5], only a Schottky diode was used as the feedback element, which served at the same time as the (non linear) large value resistor and capacitor. It was then found difficult to find a Schottky diode with a high degree of radiopurity, while on the contrary Silicon resistors in bare die of high radiopurity were found to be commercially available, with values ranging up to 150 MΩ (MSTF 6SS-15005 J-E from Mini-Systems, Inc.).…”
Section: The Gefro Circuitmentioning
confidence: 99%
“…The "slow" output of a classic charge amplifier (anyway optimized for the maximum achievable closed-loop bandwidth) can be used to measure the total deposited charge, while a "fast" open loop output provides the complementary information at high frequency. The core ideas behind the "fast" output were already described in previous publications [4], [5]. In this paper several circuit improvements were introduced to overcome open issues related to small variations of the capacitance at the input node, which could be caused by variations in the counting rate or by mechanical vibrations.…”
Section: Introductionmentioning
confidence: 99%
“…To read out each wire, we are designing a custom preamplifier based on the GeFRO design from the GERDA experiment [9]. In this design, only a small portion of the preamplifier is inside the xenon volume, then a two-meter transmission line will lead outside the volume to the rest of the …”
Section: B Position-sensing Wiresmentioning
confidence: 99%
“…The circuit solution was named GeFRO (Germanium FROnt end), and was reported in [3]. It consists of a small front-end stage located at cold, close to the detectors, and a remote warm second stage located outside the cryostat and connected to the first with long (about 10 meters) transmission lines.…”
Section: The Gefro Front-end Approachmentioning
confidence: 99%
“…The Schottky diode, compared to a standard silicon diode, allows a larger range 978-1-4673-0120-6/11/$26.00 ©20 11 IEEE of detector leakage currents to flow, and shows a dynamic resistance of the order of tenths of Gfl at cold, when biased with 10 pA, the typical leakage current value for GERDA phase II detectors. A description of the circuit in deeper detail can be found in [3].…”
Section: The Gefro Front-end Approachmentioning
confidence: 99%