Kavli Affiliate: Zeeshan Ahmed
| First 5 Authors: David C. Goldfinger, Zeeshan Ahmed, Darcy R. Barron, W. Bertrand Doriese, Malcolm Durkin
| Summary:
The CMB-S4 experiment is developing next-generation ground-based microwave
telescopes to observe the Cosmic Microwave Background with unprecedented
sensitivity. This will require an order of magnitude increase in the 100 mK
detector count, which in turn increases the demands on the readout system. The
CMB-S4 readout will use time division multiplexing (TDM), taking advantage of
faster switches and amplifiers in order to achieve an increased multiplexing
factor. To facilitate the design of the new readout system, we have developed a
model that predicts the bandwidth and noise performance of this circuity and
its interconnections. This is then used to set requirements on individual
components in order to meet the performance necessary for the full system. We
present an overview of this model and compare the model results to the
performance of both legacy and prototype readout hardware.
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