Design And Analysis Of High Precision Exponential Curvature Temperature Compensation BGR

In integrated circuits, reference voltage source are usually needed. Recently, with the development of analog integrated circuits and CMOS techniques, system on chip technology has been paid much attention. As the structure of a circuit system becomes more and more complicated, reference voltage source with high precision is required for an analog circuit, such as A/D converter, D/A converter, flash memory and so on. Since its output voltage and current of a bandgap reference (BGR) circuit is almost not affected by the temperature or the supply voltage, bandgap reference source circuit becomes a indispensable part of integrated circuits.As the resolution of data converter system increases, temperature stability of BGR's has become very important. However, due to the curvature in the reference output voltage, there exists a limit for improving the temperature stability of a first-order compensated BGR. To overcome this drawback, several compensation techniques that compensate the curvature in the reference output voltage of the first-order compensated BGR, such as lineariz V_BE directly , second-ordercurvature compensation technique, exponential curvature temperature compensation and so on, have been developed..In this work, basic theory of first-order compensated BGR was introduced, then several bandgap reference techniques were compared and analyzed. Because the...