A curvature-compensated bandgap voltage reference with a temperature coefficient trimming circuit

This paper presents an advanced topology of bandgap voltage reference (BGR) which consists of a novel curvature-compensated circuit and a current-mode trimming circuit. A positive-temperature-coefficient (positive-TC) nonlinear term is produced in the difference between the base-emitter voltages of two bipolar junction transistors (Delta V-BE) to realize the high-order curvature compensation. The Delta V-BE is generated by adding a negative-TC current into the bandgap core. Owing to the compensated Delta V-BE, the BGR could be fine-tuned by an innovative current-mode trimming circuit which takes less area and achieves a larger trimming range. Benefiting from the trimming circuit, the PVT stabilities of proposed BGR are improved. Designed in a 0.18 mu m HVCMOS process, the BGR occupies an active area of 267 mu m x 226 mu m. The post-layout simulation results show the BGR reaches a low TC of 1.64 ppm/degrees C in a wide range of -55 degrees C to 125 degrees C.

Automated summary

This paper presents an advanced topology of bandgap voltage reference (BGR) which consists of a novel curvature-compensated circuit and a current-mode trimming circuit. By introducing these designs, the performance of the BGR is improved and the PVT stabilities are enhanced.