A large signal analysis for transition edge sensors operating in electrothermal feedback

An extended treatment of microcalorimeters functioning including large signal analysis reveals some important aspects that have never been described before. Outside the small signal approximation, transition edge sensors have a non linear response which needs to be studied and understood. This is accomplished in this paper. Furthermore, the electrothermal feedback shortens the recovery time which cannot be anymore described by a unique decay time, since during the restoring process it changes considerably with the temperature inside the sensor transition.