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A high-PSRR high-order curvature-compensated CMOS bandgap voltage reference( BGR),which has the performances of high power supply rejection ratio( PSRR) and low temperature coefficient,is designed in SMIC 0. 18 μm CMOS process. Compared to the conventional curvature-compensated BGR which adopted a piecewise-linear current,the temperature characterize of the proposed BGR is effectively improved by adopting two kinds of current including a piecewise-linear current and a current proportional 1. 5 party to the absolute temperature T. By adopting a low dropout( LDO) regulator whose output voltage is the operating supply voltage of the proposed BGR core circuit instead of power supply voltage VDD,the proposed BGR with LDO regulator achieves a well PSRR performance than the BGR without LDO regulator. Simulation results show that the proposed BGR with LDO regulator achieves a temperature coefficient of 2. 1 × 10-6/ ℃ with a 1. 8 V power supply voltage and a line regulation of 4. 9 μV / V at 27 ℃. The proposed BGR with LDO regulator at 10 Hz,100 Hz,1 k Hz,10 k Hz and 100 k Hz have the PSRR of- 106. 388,- 106. 388,- 106. 38,- 105. 93 and-88. 67 d B respectively.
A high-PSRR high-order curvature-compensated CMOS bandgap voltage reference (BGR), which has the performances of high power supply rejection ratio (PSRR) and low temperature coefficient, is designed in SMIC 0. 18 μm CMOS process. Compared to the conventional curvature-compensated BGR which adopted a piecewise-linear current, the temperature characterize of the proposed BGR is effectively improved by adopting two pieces of current including a piecewise-linear current and a current proportional 1. 5 party to the absolute temperature T. By (LDO) regulator whose output voltage is the operating supply voltage of the proposed BGR core circuit instead of power supply voltage VDD, the proposed BGR with LDO regulator achieves a well PSRR performance than the BGR without LDO regulator. Simulation results show that the proposed BGR with LDO regulator achieves a temperature coefficient of 2. 1 × 10-6 / ℃ with a 1.8 V power supply voltage and a line regulation of 4. 9 μV / V at 27 ° C. The proposed BGR with LDO regulator at 10 Hz, 100 Hz, 1 k Hz, 10 k Hz and 100 k Hz have the PSRR of-106. 388, -106. 388, -106. 38, - 105. 93 and-88. 67 d B respectively.