Abstract
A CMOS chopper temperature sensor is present. Accurate bandgap reference and PTAT voltage are designed. The circuit uses substrate bipolar transistors as a temperature sensing element. In order to reduce the effect of the offset voltage of the operational amplifier in the circuit, we use the chopper stabilization technique to eliminate the offset voltage. The complete system is realized in a double metal 0.6□m CMOS process, and the chip size is 1.3mm2. In the temperature range from -55 to 125□C, the total inaccuracy of bandgap reference and PTAT voltage is 3.5□C without calibration. The circuit operates at a typical supply voltage, 3.3V, and its supply current is 150□A. Experiment results of the bandgap reference and PTAT voltage and simulated design of the circuit are discussed in this thesis.