A High Precision Circuit of Bandgap Voltage Reference
Haoliang Li · 2005
Based upon analysis of several type s of bandgap voltage reference circuit, we demonstrate a high precision circuit of bandgap voltage reference with relatively simple structure for high-speed se rial link. With an improved structure of two-stage high-gain operational ampli fier, the simulation results show that the error in worst case is 0.057% over th e temperature range of -50～70 °C. Test circuits have been fabricated in TSMC 0.25 μm CMOS mixed-signal model process. Experimental results yield an output voltage 1.233 7～1.235 6 V which is constant within 0.154% over the tempe rature range of -50～70 °C with power supply of 2.5 V, and a vera ge error of 0.016% between simulation and experimental results. The chip area of bandgap voltage reference circuit is 158 μm×164 μm.