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==Setup, operation, and readout==
[[File:TES schematic.pdf|thumb|alt=Schematic of TES-SQUID circuit|Schematic of TES-SQUID circuit]]
The TES is voltage-biased by driving a current source ''I''<sub>bias</sub> through a load resistor ''R''<sub>L</sub> (see figure). The voltage is chosen to put the TES in its so-called "self-biased region" where the power dissipated in the device is constant with the applied voltage. When a [[photon]] is absorbed by the TES, this extra power is removed by negative [[electrothermal feedback]]: the TES [[Electrical resistance|resistance]] increases, causing a drop in TES current; the [[Joule power]] in turn drops, cooling the device back to its equilibrium state in the self-biased region. In a common [[SQUID]] readout system, the TES is operated in series with the input coil ''L'', which is inductively coupled to a SQUID series-array. Thus a change in TES current manifests as a change in the input [[flux]] to the SQUID, whose output is further amplified and read by room-temperature electronics.
==Functionality==
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