Low-Noise Bandgap Voltage Reference

At present, reference voltage sources (ION) are still a typical unit for building most digital and analog systems. It is necessary to create a new reference voltage source capable of operating over a wide range of voltages. Purpose – develop a calibrated low noise reference voltage source. A new reference voltage source is presented with the possibility of correcting the reference voltage nominal and the current-frequency coefficient, capable of operating in a wide range of supply voltages from 2.5 to 5.5 V and a voltage current of less than 100 μA, having a low flicker noise level, with root-mean-square deviation of less than 4 μV in the 0.01-25 Hz band. After trimming, the ION has a temperature coefficient of less than 5 ppm/m111 in the temperature diapa zone from − 60-150 ° C. The reference voltage is 1.25 V, with the ability to adjust with a step of 2-3 mV in the range of 1.24-1.26 V. This ION is made using CMOS technology 180 nm. Based on the results obtained, it was found that in some applications, such as analog-to-digital (ADC) and digital-to-analog (DAC) converters, the accuracy and noise characteristics of the ION have a significant impact on the performance of the entire system.