Device and method for the demodulation of modulated...

H - Electricity – 01 – L

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H01L 27/146 (2006.01)

Patent

CA 2624299

A new pixel in semiconductor technology comprises a photo-sensitive detection region (1) for converting an electromagnetic wave field into an electric signal of flowing charges, a separated demodulation region (2) with at least two output nodes (D10, D20) and means (IG10, DG10, IG20, DG20) for sampling the charge-current signal at at least two different time intervals within a modulation period. A contact node (K2) links the detection region (1) to the demodulation region (2). A drift field accomplishes the transfer of the electric signal of flowing charges from the detection region to the contact node. The electric signal of flowing charges is then transferred from the contact node (K2) during each of the two time intervals to the two output nodes allocated to the respective time interval. The separation of the demodulation and the detection regions provides a pixel capable of demodulating electromagnetic wave field at high speed and with high sensitivity.

L'invention concerne un nouveau pixel en technologie des semi-conducteurs, ce pixel comportant une zone de détection photosensible (1) pour convertir un champ d'ondes électromagnétiques en signal électrique de flux de charges, une zone de démodulation (2) séparée dotée d'au moins deux noeuds de sortie (D10, D20) et de moyens (IG10, DG10, IG20, DG20) pour échantillonner le signal de courant de charge dans au moins deux laps de temps différents à l'intérieur de la période de modulation. Un noeud de contact (K2) relie la zone de détection (1) à la zone de démodulation (2). Un champ de dérive transfert le signal électrique de flux de charges de la zone de détection au noeud de contact. Le signal électrique de flux de charges est ensuite transféré pendant les deux laps de temps du noeud de contact (K2) aux deux noeuds de sortie affectés au laps de temps respectif. La séparation des zones de démodulation et de détection confère au pixel l'aptitude à démoduler un champ d'ondes électromagnétiques à grande vitesse et haute sensibilité.

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