Patent ID: 8210743

Claim:
A temperature sensor circuit comprising: a band-gap reference voltage circuit configured to offset a positive temperature coefficient of a voltage appeared at a resistor and a negative temperature coefficient of a base-emitter voltage of a diode-connected bipolar transistor, wherein the resistor and the diode-connected bipolar transistor are separated into a transistor-resistor series circuit in which a bipolar transistor and a resistor are connected in series, and a transistor-diode series circuit in which a bipolar transistor and a diode-connected bipolar transistor are connected in series, wherein the transistor-resistor series circuit is configured such that an emitter of the bipolar transistor is connected to a power supply voltage terminal, a collector thereof is connected to one end of the resistor, and the other end of the resistor is grounded, and wherein the transistor-diode series circuit is configured such that an emitter of the bipolar transistor is connected to the power supply voltage terminal, a collector thereof is connected to a collector of the diode-connected bipolar transistor, and an emitter of the diode-connected bipolar transistor is grounded; a first buffer circuit in which an input terminal thereof is connected to the one end of the resistor of the transistor-resistor series circuit; a second buffer circuit in which an input terminal thereof is connected to a collector of the diode-connected bipolar transistor of the transistor-diode series circuit; and a voltage divider circuit connected between an output terminal of the first buffer circuit and an output terminal of the second buffer circuit, and configured to divide a voltage appeared between the output terminals so that a voltage having any one of temperature coefficients different from each other can be extracted.