Charge-coupled device (CCD), eliminating the background level from a detected signal, detection structure and method for using such a CCD

摘要

Charge-coupled device (CCD), eliminating the background level of a detected signal, provided with an input circuit comprising an injection source 12 and an electrode 16, which controls a storage potential well, which can be subdivided into an extraction well 18 and an output well 19, which are separated by the separation potential created by a separation electrode 27. This CCD is noteworthy in that its input circuit comprises a floating electrode 25 connected to the separation electrode 27, so that the separation potential is slaved to the background level, and an isolation electrode 28 which isolates the reference well 29 from the output well 19, during the measurement operation and the doping operations respectively under the floating electrode and under the separation electrode, which are carried out so that the potential wells situated respectively under each of these electrodes have a different depth from each other. This device makes it possible to produce infrared detection structures using CdxHg1-xTe detectors. IMAGE