A Curvature Compensated and Adjustable Bandgap Reference Voltage Circuit With 1.2 V Supply
Ying Yu · Modern Electronics Technique · 2007
Based on analyzing the conventional bandgap reference circuit,a curvature compensated and adjustable bandgap reference was designed,and it has low temperature confident.The Spectre of Cadence was used in designing and simulating the circuit.And the SMIC 0.25 μm CMOS process was used for designing and simulation.The operational amplifier included in the circuit has two stages,and its open loop gain is 85 dB.The bandgap reference generates efficient curvature compensation with a simple circuit of parallel connected resistors.The circuit provides a temperature coefficient of 3.10 ppm /℃ over a temperature range from -25~125 ℃ with 2.5 V power supply.The consumption of the circuit is 0.859 mw.The circuit can also work with 1.2 V power supply,and it provides a temperature coefficient of 5.34 ppm/℃ over a temperature range from -25~125 ℃.And its power consumption is 0.36 mW.