Patent ID: 7276891
Filing Date: 2007-10-02
Classification: G01K,H01L

Abstract:
1. A semiconductor integrated circuit device, comprising: a temperature-to-current converter which outputs a first electric current according to a particular change in temperature; a current generator which outputs a second electric current of small temperature dependence, compared with temperature dependence of the first electric current; and a current-to-voltage converter which receives as an input a third electric current equivalent to a difference between the first electric current and the second electric current, converts the third electric current into a voltage, and outputs the voltage, wherein the temperature-to-current converter comprises: a power supply line which gives a power supply potential; a reference line which gives a grounding potential; a first electric-current path including a first MOS transistor connected at one terminal thereof to the power supply line, a first resistor to which another terminal of the first MOS transistor is connected, and a plurality of parallel-interconnected PN-junction diodes each connected to the first resistor, wherein the first electric-current path is terminated at the reference line; a second electric-current path including a second MOS transistor connected at one terminal thereof to the power supply line, and a PN-junction diode to which another terminal of the second MOS transistor is connected, wherein the second electric-current path is terminated at the reference line; a third electric-current path having a third MOS transistor connected between the power supply line and an output terminal of the temperature-to-current converter; and a first operational amplifier whose non-inversion input terminal is connected to another terminal of the first MOS transistor, whose inversion input terminal is connected to another terminal of the second MOS transistor, and whose output terminal is connected to gate terminals of each of the first to third MOS transistors; and wherein, in the current generator: a thirteenth resistor and a tenth MOS transistor are connected in series between the power supply line and the reference line; and an eleventh MOS transistor is connected between the reference line and an output terminal of the temperature-to-current converter; and wherein a sixth operational amplifier with a non-inversion input terminal to which a potential at a connection point between the thirteenth resistor and the tenth MOS transistor is input, and with an inversion input terminal to which a second reference potential is input, has an output terminal connected to gate terminals of the tenth and eleventh MOS transistors.