A high accuracy and configurable voltage (1.2/1.8/2.5/3.3 V) bandgap reference with base current compensation for DC–DC converters

Abstract

Presented is an improved bandgap reference (BGR), which has the performance of high accuracy and can generate the required voltage reference. In this BGR, the improved base current compensation is proposed to eliminate the effect of the base current. Meanwhile, a high reference voltage generator is used to provide configurable output voltages of 1.2/1.8/2.5/3.3 V needed by DC-DC converters. The BGR is realized in a standard 180-nm Complementary Metal Oxide Semiconductor (CMOS) process with an area of 0.05 mm × mm. Among the five sample chips of the reference, in the temperature range of −40°C to 125°C, the temperature coefficients (TCs) of all the reference voltages range from 3 to 38 ppm/°C. The best average value of TCs is 6.03 ppm/°C when the reference voltage is 2.5 V. The best line sensitivities (LS) are 0.23%/V when the reference voltage is 1.8 V with the power consumption of 150μW, when the supply voltage (VDD) is =5 V.

Design of a High PSRR Low-pressure Bandgap Reference Source with Curvature Compensation

“…Considering the nonlinear change of voltage with temperature, it is necessary to compensate for the temperature curve [6] . The common temperature compensation methods include exponential curvature compensation, piecewise curvature compensation technology, BJT non-uniform current density compensation technology, and wi MOS compensation technology [7] . Of course, before compensation, it is very important to derive the Vbe characteristic curve of the transistor.…”

Dual‐channel pre‐regulator structure for the bandgaps in high step‐down DC‐DC converters

“…Therefore, a pre-regulator structure with compact prototype, small area, and low power consumption is needed to generate a robust low-voltage rail that is non-susceptible to temperature and input voltage changes. Figure 1 shows the typical pre-regulator and BGR application in DC-DC systems [1][2][3][4][5].…”