Patent ID: 7336108
Filing Date: 2008-02-26
Classification: G05F,G11C,H02M,H03K,Y02B

Abstract:
1. A semiconductor integrated circuit, comprising: a pump circuit configured to raise an external power supply voltage to generate a stepped-up voltage; and a detector circuit configured to detect the stepped-up voltage generated by said pump circuit to control activation/deactivation of said pump circuit, wherein said detector circuit includes: a differential amplifier configured to compare the stepped-up voltage with a fixed reference voltage; and a current control circuit configured to set an amount of a bias current running through said differential amplifier to a first amount in response to the activation of an entirety of said pump circuit, and to set the amount of the bias current running through said differential amplifier to a second amount in response to the deactivation of the entirety of said pump circuit, wherein said current control circuit includes: a first transistor configured to be in a conductive state at all times; a second transistor having a conductive/nonconductive state thereof controlled in response to a signal that controls the activation/deactivation of said pump circuit; and a third transistor connected in series with said second transistor, said first transistor and said third transistor receiving substantially the same gate voltage, wherein the bias current is a sum of a current running through the first transistor and a current running through the second transistor.