A High Temperature–Voltage Sensitivity 2-Transistor Voltage Reference With Wide Range Operation

Measurement of the temperature in an integrated circuit (IC) is essential for evaluating temperature-dependent circuit performance. Using off-chip temperature sensors for this purpose has limited accuracy in sensing the on-chip temperature. For on-chip integration with ICs, a low-power and compact temperature sensor is required. Therefore, this letter presents a 2-Transistor (2T) voltage reference generator (VRG) that overcomes the limited sensitivity of conventional structures through the deep-subthreshold operation and achieves high (Formula presented.) – (Formula presented.) sensitivity by employing the narrow-width effect. The proposed 2T VRGs are implemented in 28-nm FD-SOI process and demonstrated to operate over a temperature range of 200 to 400 K, achieving a 0.86 mV/K (Formula presented.) – (Formula presented.) sensitivity with 3.6% relative inaccuracy.