A Resistor-Less CMOS Bandgap Reference with High-Order Temperature Compensation

This paper presents a resistor-less high-precision CMOS bandgap voltage reference (BGR). A high-order curvature compensation is applied to correct higher-order nonlinear temperature terms of the emitter-base voltage (V-EB) and meet the high-precision request. With this nonlinearity correction method, the CTAT voltage V-EB can be better linearized over a wide temperature range. Without using resistors, the offset voltage of the BGR output buffer is applied to yield the PTAT voltage. Using the proportionally weighted sum of negative temperature coefficient (TC) on V-EB and positive TC on V-OS, a highly stable bandgap voltage reference can be achieved. The proposed BGR is implemented in 0.18-mu m CMOS technology. The active area of the prototype BGR is 300 mu mx440 mu m. A minimum TC of 2.5ppmPC is achieved over a temperature range from -40 degrees C to 85 degrees C. The maximum total current is 26 mu A over the supply voltage ranging from 1.6V to 2V. The BGR output is about 996mV with the power supply noise attenuation of -48dB.

Automated summary

This paper presents a resistor-less high-precision CMOS bandgap voltage reference design, achieving high stability and precision through nonlinear correction methods and curvature compensation.