Patent ID: 8461914

Claim:
A reference signal generating circuit comprising: a band gap reference main unit that includes a first cascode current mirror unit having a plurality of first conductive-type transistors, a second cascode current mirror unit having a plurality of second conductive-type transistors, and a reference unit that uses a band gap to generate a reference signal, wherein the first cascode current mirror unit is connected to a first potential, the reference unit is connected to a second potential, and the second cascode current mirror unit is connected between the first cascode current mirror unit and the reference unit; a first bias voltage generating unit that copies a current flowing through the first cascode current mirror unit to generate a bias voltage of the second cascode current mirror unit and comprises a first serial circuit comprising a first resistor and a first diode; a second bias voltage generating unit that copies a current flowing through the second cascode current mirror unit to generate a bias voltage of the first cascode current mirror unit; and an output unit that generates the reference signal based upon an output of the band gap reference main unit, and outputs the reference signal, the reference unit includes a first diode that is connected to one of a plurality of current mirrors that make up the second cascode current mirror unit, and a second diode that is connected to another one of the plurality of current mirrors that make up the second cascode current mirror unit and that has a pn junction area that is n times as large as a pn junction area of the first diode, the first bias voltage generating unit further includes a diode having the same pn junction area as that of the first diode, and the second bias voltage generating unit further includes a diode having the same on junction area as that of the first diode.