Measuring system and imaging device using such a system

摘要

The system has an n-type metal-oxide-semiconductor (N-MOS) reference transistor (242asterisk) with a source connected to an end of a reference mirror branch (236asterisk). An operational amplifier (240) has a negative input connected to the source and an output connected to a gate of the transistor. An N-MOS measurement transistor (242) has a gate connected to the output of the amplifier. A measurement unit measures difference between measurement current (imes1) passing via a measurement bolometer (222) e.g. infrared bolometer, and current (i'ref) passing via a measurement mirror branch (236).