Band-gap current reference with curvature compensation
Xing Yang · The Internet of Things · 2012
The principle of band-gap voltage reference is introduced. A design method of band-gap voltage reference and current reference with curvature compensation based on Widlar′s structure is proposed. The circuit is simulated with TSMC_0.5 μm model, in the temperature extent of -40~150 ℃, the output temperature coefficient of the band-gap voltage reference is 12 ppm/℃, the output temperature coefficient of the current voltage reference is 42 ppm/℃. The theory of curvature compensation circuit is analyzed and the working mechanism of curvature compensation circuit is discussed.