Patent ID: 6404178
Filing Date: 2002-06-11
Classification: G05F

Abstract:
A power supply circuit converting an external power supply potential into an internal power supply potential to supply the internal power supply potential to a load circuit performing a prescribed operation in response to activation of a control signal, comprising:an external power supply line supplying said external power supply potential; an internal power supply line, coupled to said load circuit, supplying said internal power supply potential; a potential difference amplifying circuit amplifying a potential level difference between said internal power supply potential and a reference potential to output the amplified potential level difference to a control node; a current supply circuit for supplying a supply current amount according to a potential level of said control node to said internal power supply line from said external power supply line; and a forced current supply control circuit for forcibly performing current supply to said internal power supply line from said external power supply line, regardless of said potential level difference, according to an auxiliary control signal activated for performing a preliminary operation performed in advance of said prescribed operation and said control signal, said forced current supply control circuit forcibly performing said current supply during a prescribed period from a first time point determined in response to activation of said auxiliary control signal till a second time point determined in response to activation of said control signal.