Patent ID: 6747440
Filing Date: 2004-06-08
Classification: G05F,G06K,H02M

Abstract:
A voltage regulator circuit for producing an internal supply voltage from an external supply voltage in a smart card IC, comprising:a series regulator circuit including: a series regulation transistor having a gate terminal, a source terminal, and a drain terminal, said source and said drain terminals being disposed in series between an external supply voltage and an internal supply voltage; and a regulator terminal for regulating a potential applied to said gate terminal of said series regulation transistor; and a capacitor and a transfer gate connected in series between the external supply voltage and said regulator terminal, said transfer gate being a field-effect transistor; said transfer gate to be controlled by a variable electrical potential, said transfer gate being opened by the variable electrical potential during a transient process to charge said capacitor, and said transfer gate being closed by the variable electrical potential after a transient problem ends.