A Thevenin-equivalent circuit analysis shows electrothermal feedback suppresses Johnson noise from the bolometer but not Johnson noise from external series resistance, which sets a noise floor at high loop gain.
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Johnson Noise Suppression in AC-Biased Transition-Edge Sensor Bolometers: A Th\'evenin-Equivalent Circuit Analysis
A Thevenin-equivalent circuit analysis shows electrothermal feedback suppresses Johnson noise from the bolometer but not Johnson noise from external series resistance, which sets a noise floor at high loop gain.