Patent ID: 6909294
Filing Date: 2005-06-21
Classification: G04F,H01L

Abstract:
1. A time recording device comprising a time scale semiconductor element with a transistor structure including source/drain regions, a channel region between the source/drain regions, a gate dielectric arranged above the channel region, a floating gate electrode arranged above the gate dielectric, a layer sequence including an oxide layer arranged on the floating gate electrode and a nitride layer arranged on the oxide layer, the layer sequence being arranged above the floating gate electrode, and a control gate electrode arranged above the layer sequence; a charge injection unit for injecting charges into the floating gate electrode and into the nitride layer by applying a voltage or voltage pulses to the control gate electrode, a centre of concentration of the charges injected into the nitride layer being located at the interface between the oxide layer and the nitride layer of the layer sequence; and a unit for recording a time elapsed since charge injection on the basis of changes in the transmission behaviour of the channel region caused by a shift in the centre of concentration of the charges in the nitride layer away from the interface.