Patent ID: 8373405
Filing Date: 2013-02-12
Classification: G01R,H03K

Abstract:
1. A power supply voltage detection circuit comprising: a reference signal generation circuit that generates a reference signal according to a power supply voltage; a first transistor having a current flowing between a first terminal and a second terminal, the current being controlled according to the reference signal; a voltage generation circuit that generates a control voltage according to a potential difference between the power supply voltage and the first terminal of the first transistor, the voltage generation circuit being connected in series with the first transistor; and a second transistor that controls whether or not to output the power supply voltage according to the control voltage, wherein the reference signal generation circuit comprises: a reference current generation circuit that generates a reference current according to the power supply voltage and outputs the reference current as the reference signal; and a current mirror circuit that includes the first transistor and passes a current corresponding to the reference signal, between the first terminal and the second terminal of the first transistor.