An Improved CMOS Bandgap Reference with Self-biased Cascoded Current Mirrors

In this paper, an improved cascoding CMOS bandgap reference(BGR) without opamp is presented. By incorporating a simple feedback transistor and several resistors into conventional cascoding circuit, the power-supply rejection and 2^nd -order curvature compensation circuit is formed. With Spectre tool and 0.35μm CMOS model, the simulation has been carried out and the results show that the PSRR and temperature performance are both improved evidently. PSRR of the improved BGR is 93dB at DC and TC is 7ppm/°C over the temperature range of -40~+125°C.