A Sub-5 ppm/°C Bandgap Voltage Reference With Dual Source-Sink Current Compensation

This work presents a bandgap voltage reference (BGR) with source-sink dual current compensation achieving a low temperature coefficient (TC) over the automotive temperature range from −40 to 125 °C. The two compensation currents are the inverted-V current (I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">invV</sub>) and the high-low temperature linear current (I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">HLT</sub>), which appear in the form of sourcing and sinking currents, respectively. This design introduces an inverted-V current to mitigate the degradation of the compensation effect caused by temperature range drifts. By exploiting the characteristics of I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">invV</sub> and I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">HLT</sub> exhibiting the same drift trend, the dual current compensation achieves the compensation performance over the entire automotive temperature range while mitigating the impact of temperature range drifts, thereby optimizing the overall compensation effect. The measured results show that it achieves the best TC of 2.0 ppm/°C and an average consumption current of 44 μA at room temperature. Moreover, the linear sensitivity (LS) is 0.04%/V and power supply rejection (PSR) is −60 dB at 1 Hz at room temperature.