A Front-End Readout for Micro Bolometers Having Sub Nano Volt Noise Floor

Arnaboldi, C.; Pessina, G.

doi:10.1109/tns.2006.881096

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…In this case, bandwidth was 60 MHz, limiting the peaking time to about 6 ns, as in figure 11, but noise was not optimized for spectroscopy. To measure energy spectra, another amplifier was used with very low noise and high gain, designed in our laboratory for a bolometric application [16]. Input series noise from this amplifier was less than 0.5 nV/ √ Hz, making its contribution negligible compared with noise from the cold JFET and from the line terminating resistor R T .…”

Section: The New Readout Scheme For Ionization Detectorsmentioning

confidence: 99%

A new approach to the readout of cryogenic ionization detectors: GeFRO

et al. 2011

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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 biasing and readout.

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Section: The New Readout Scheme For Ionization Detectorsmentioning

confidence: 99%

A new approach to the readout of cryogenic ionization detectors: GeFRO

et al. 2011

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“…For each bolometer, the detector signal is readout from a cold buffer stage composed of a SNJ450 Si-JFET from Interfet in unity gain follower configuration, the Si-JFET being held at its optimum temperature of operation, around 130 K. The parasitic capacitance C PB at the JFET input is of the order of 15 pF. The signal at the source of the Si-JFET is read at room temperature by the very low noise single sided input preamplifier [5,6], amp-signal. The connecting cables from the cold to the warm stage contribute with about 200 pF of parasitic capacitance C PF .…”

Section: System Set-upmentioning

confidence: 99%

The Readout and Biasing System for the MARE Experiment in Milan

et al. 2011

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The complete readout and biasing system for the MARE experiment in Milan is presented. The experiment aims at a direct measurement of the neutrino mass, and is based on an array of microcalorimeters coupled to semiconductor thermistors. The readout is based on JFETs operated inside the cryostat at cold (130 K), to buffer the voltage signal from the thermistors. The sources of the JFETs are fed into second stage amplifiers with very low noise (less than 0.5 nV/ √ Hz white noise) and programmable high gain. The outputs are then processed by Bessel filters and acquired with a commercial DAQ system. Every 20 channels, an additional group of 4 is used to amplify the ground reference from inside the cryostat; this common ground signal is then subtracted from each channel. This approach allows to recover a fully differential readout with a smaller number of cables with respect to the standard differential configuration. The detector bias is programmable in voltage and sign with 8-bit resolution. A test signal can be superimposed on the bias voltage, in order to test each channel individually. All the readout system is remotely programmable from a PC, coupled through optical fibers.

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“…Figure 2 shows the measured noise distribution of the cold FET buffer stage at some selected frequencies. The source of the cold buffer stage is readout from the very low noise preamplifier [2]. Low noise in the preamplifier stage (noted as PA in Fig.…”

Section: Front-endmentioning

confidence: 99%

The Front-End System For MARE In Milano

Arnaboldi¹,

Pessina

2009

AIP Conference Proceedings

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The first phase of MARE consists of 72 μ-bolometers composed each of a crystal of AgReO 4 readout by Si thermistors. The spread in the thermistor characteristics and bolometer thermal coupling leads to different energy conversion gains and optimum operating points of the detectors. Detector biasing levels and voltage gains are completely remote-adjustable by the front end system developed, the subject of this paper, achieving the same signal range at the input of the DAQ system. The front end consists of a cold buffer stage, a second pseudo differential stage followed by a gain stage, an antialiasing filter, and a battery powered detector biasing set up. The DAQ system can be used to set all necessary parameters of the electronics remotely, by writing to a μ-controller located on each board. Fiber optics are used for the serial communication between the DAQ and the front end. To suppress interference noise during normal operation, the clocked devices of the front end are maintained in sleep-mode, except during the set-up phase of the experiment. An automatic DC detector characterization procedure is used to establish the optimum operating point of every detector of the array. A very low noise level has been achieved: about 3 nV/√Hz at 1 Hz and 1 nV/√Hz for the white component, high frequencies.

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A Front-End Readout for Micro Bolometers Having Sub Nano Volt Noise Floor

Cited by 8 publications

References 17 publications

A new approach to the readout of cryogenic ionization detectors: GeFRO

A new approach to the readout of cryogenic ionization detectors: GeFRO

The Readout and Biasing System for the MARE Experiment in Milan

The Front-End System For MARE In Milano

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