A 3.2 ppm/°C curvature-compensated bandgap reference with wide supply voltage range

A novel bandgap reference (BGR) with low temperature and supply sensitivities, which is compatible with standard Bipolar and BiCMOS processes, is presented in this paper. Utilizing exponential curvature compensation (ECC) and translinear loop circuit (TLC), high-order curvature compensation is realized to reduce temperature drift. Besides, two feedback loops are embedded in the circuit to enhance the stability and to reduce the dependence on supply voltage. Experimental results of the proposed BGR implemented with 1-μm Bipolar process demonstrate that a temperature coefficient (TC) of 3.2 ppm/°C is realized, a power supply rejection ratio (PSRR) of 60 dB is achieved without filtering capacitors, and the line regulation is better than 0.088 mV/V from 3.5 V to 30 V supply voltage dissipating a maximum supply current of 39 μA. The active area of the proposed BGR is 700 μm×750 μm.