Patent ID: 8514010
Filing Date: 2013-08-20
Classification: G05F

Abstract:
1. A reference current generation circuit, comprising: a reference voltage generation unit configured to generate a reference voltage by using a depletion type transistor; and a voltage/current conversion unit configured to generate a reference current from the reference voltage, wherein the reference voltage generation unit includes a depletion type first NMOSFET whose gate and source are connected and an enhancement type second NMOSFET whose gate and drain are connected, wherein the reference voltage is output from a connection node of the source of the first NMOSFET and the drain of the second NMOSFET, wherein the voltage/current conversion unit includes a third NMOSFET having a gate connected to an application terminal of the reference voltage, and a resistor connected between a source of the third NMOSFET and a ground terminal, and wherein a current flowing through the resistor is output as the reference current.