A Sub-1 V Temperature-Insensitive-PSR Bandgap Reference with Complementary Loop Locking

摘要

This paper presents a novel low-voltage bandgap reference with improved power supply rejection (PSR). The proposed circuit adopts a complementary loop locking approach for stabilizing the drain-source voltages of the current mirrors, which gives rise to a boost of the PSR performance by more than 30 dB over -20-110 degrees C and at 1-V supply. An analysis shows that the PSR of the proposed bandgap reference is typically characterized with its insensitivity to temperature variations. The circuit is designed with a commercial 0.18-mu m CMOS process. The experiment results of Monte Carlo simulation demonstrate that the average PSR with 1-V supply is -106 dB at DC and is -93.8 dB at 1 kHz (attained under a room temperature condition of 27 degrees C). And the temperature coefficient of the DC-based PSR is about 0 .83%/degrees C at 1-V supply, significantly decreased by three-six folds compared to other conventional designs. The quiescent current consumed is only about 13.5 mu A.