Design of a temperature sensor
Wenjiang Liu · Information technology newsletter · 2009
A temperature sensor with two series PNP transistors in TSMC 0.18μm mixmode process using PN-junctions of the CMOS substrate PNP transistors as temperature sensor's cells.These two series PNP transistors reduce the effect of the voltage offset,a folded cascode amplifier increases the precision of the whole circuit,and a negative feedback structure improves the stability of VPTAT the circuit. The simulation results show a perfect linearity of and temperature from-20℃ to 120℃ and a 140dB power supply ripple rejection of the circuit.