A Self-Regulated Bandgap Reference with High Order Temperature Compensation

Abstract

A self-regulated bandgap voltage reference (BGR) circuit with high order temperature compensation is presented. The self-regulated structure reduces the reference voltage variation due to the changes of supply voltage and achieves good performance on power supply rejection (PSR). To improve temperature coefficient (TC) of reference voltage, high order temperature compensation is applied without using additional amplifier, which saves area and power consumption. Implemented in a 0.18 μm BCD 1P4M process, measured results show that the proposed BGR achieves a best TC of 2.7 ppm/°C from -40 to 125 °C after trimming and a line sensitivity of 0.008%/V under a supply range from 2-5.5 V. The total circuit area is 0.0585 mm² with a current consumption of 37.5 μA.