Non-uniform sampling using synchronised ADCs

Abstract

Some microcontrollers of the STM32 family are equipped with two or three synchronised ADCs. Non-uniform sampling could be utilized for increasing an unaliased signal bandwidth, that could be processed by these microcontrollers. In this paper, conversion timing was studied, and non-uniform sampling function proposed in order to exploit the ADC as most as possible. It was found that attenuation of a sample&hold circuit limits an input bandwidth earlier than aliasing, nevertheless, it is still significantly wider bandwidth than an unaliased bandwidth without usage of non-uniform sampling.