An analytical model for electronic noise in a cryogenic bolometer detector readout circuit. (1st November 2022)

• Record Type: Journal Article
• Authors: Vatsa, V.; Reza, A.; Mazumdar, A.; Pose, M.S.; Mallikarjunachary, S.; Nanal, V.; Pillay, R.G.; Ramakrishnan, S.; Shrivastava, A.
• Is Part Of: Journal of instrumentation. Volume 17:Number 11(2022)
• Publication Date: 2022-11-01
• Subjects: Cryogenic detectors -- Front-end electronics for detector readout -- Double-beta decay detectors; Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/17/11/T11013
• Languages: English
• ISSNs: 1748-0221

Abstract

Abstract: 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.