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A high precision high-order curvature-compensated bandgap reference (BGR) compatible with standard BiCMOS process is presented in this paper that is capable of working down to input voltages of 1.6 V with 1.285 V output voltage. High-order curvature correction for this reference is accomplished by a novel piecewise technique, which realizes exponential curvature compensation in temperature range, and a logarithmic compensation term proportional to VT In T in higher temperature range through simple structures. Experimental results of the proposed BGR implemented in 0.5-μm BiCMOS process demonstrate that a temperature coefficient (TC) of 5 ppm/°C is realized at 3.6 V power supply, a power-supply noise attenuation (PSNA) of 70 dB is achieved without filtering capacitors, and the line regulation is better than 0.47 mV/V from 1.6 V to 5 V supply voltage while dissipating a maximum supply current of 25 μA. The active area of the presented BGR is 180 μm × 220 μm.