Influence of contact geometry on NTD sensor performance

Vatsa, Veer N.; Reza, A.; Mazumdar, A.; Nanal, V.; Pillay, R. G.; Shrivastava, A.; Ramakrishnan, S.; Mallikarjunachary, S.; Pose, M. S.

doi:10.1109/wolte49037.2021.9555455

Cited by 1 publication

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“…Four indigenously fabricated NTD Ge sensors (M713, M715, M716 and M720) were directly coupled to the copper holder using GE varnish (see figure 3) and the setup was mounted on the mixing chamber stage of the CFDR-1200. All four sensors have similar carrier concentrations and are identical in dimension (1mm × 1mm × 1mm) and with face-type contact [16,17]. A set of SMD resistors, selected from same manufacturing batch with similar packaging, and having resistance in the range ∼ 1-100 MΩ at 300 K, with negative temperature coefficient (i.e.…”

Section: Noise Measurements With Ntd Ge Sensors and Smd Resistorsmentioning

confidence: 99%

An analytical model for electronic noise in a cryogenic bolometer detector readout circuit

et al. 2022

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This paper presents an analytical model to quantify the measured noise in a cryogenic bolometer readout circuit. The model includes the contributions from the bias resistors and sensor resistors, voltage and current noise of amplifier, and cable capacitance. The model parameters are empirically estimated using frequency domain analysis of the measured noise data of indigenously developed Neutron Transmutation Doped (NTD) Ge sensors. The model is shown to describe noise data for NTD Ge sensors over a wide range of resistances corresponding to temperatures in the range 20–70 mK. Relative contributions of different components are discussed and it is shown that the contribution to the overall noise from the differential amplifier at 300 K is the dominant source. It is observed that the amplifier flicker noise is significantly lower than that specified in the amplifier datasheet. The present study also indicates that a desirable value of resistance of NTD sensor (R NTD) from noise considerations is ≲ 1 GΩ at ∼ 20 mK.

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Section: Noise Measurements With Ntd Ge Sensors and Smd Resistorsmentioning

confidence: 99%