Two-Stage Reduction in the Output Noise Level of Voltage Sources

Abstract

The development of digital technologies that are widely used in industry and agriculture places high demands on voltage reference sources for a number of parameters, each of which is important in its own way. However, a further increase in the resolution of analog-to-digital and digital-to-analog converters and, therefore, of all digital signal processing is impossible without an improvement in such a quality indicator of reference voltage sources as the noise level. In this paper, we discuss the method and schematic solution of designing a low-noise source of stable dc voltage base on standard integrated circuits of voltage stabilizers. The schematic solution provides an ability to reduce the output noise level of the corresponding reference voltage sources to a level slightly higher than the intrinsic noise level of operational amplifiers used as a part of the device block circuits, maintaining the polarity and stability of the device output voltage relative to the output voltage of the used integrated circuit of a voltage stabilizer, and reduction in capacitance of used capacitors compared with known circuit solutions.