THE SUBSTRATE POTENTIAL GENERATING SYSTEM

摘要

The semiconductor substrate of a first conductivity is provided with a dynamic circuit with a capacitance. A first semiconductor zone of a second conductivity is partly formed on the substrate, while a block parasitic diode is formed at a junction zone between the semiconductor zone and the substrate. An AC signal is supplied to an electrode of a coupler capacitance, whose other electrode is coupled to a further capacitance electrode at a junction. A first rectifier on the first semiconductor zone is conductive. When the junction potential has exceeded a preset value. A second rectifier couples the substrate to the junction and is conductive when the instantaneous value lies outside the potential range.