In-circuit Signal Measurement Method for Interleave Uniformly Spaced Sampling

Abstract

This paper presents a uniform sequential interleaved sampling method for repetitive signals using the hardware resources (registers, counters, comparators, analog digital converter) of a basic microcontroller to obtain an equivalent higher sampling rate [1]. In the proposed method, all signals and events are derived from a single internal system clock signal according with the microcontroller’s architecture in order to assure the high precision jitter free time sampling requirements needed in acquisition phase [2] [3]. As a result, all samples are triggered, acquired, and saved in precise defined moments and after that, the corresponding results are extracted in software interrupts when the central unit is available for such tasks. The sampling is executed, if needed, for negative time related to a trigger event of interest and average filtering is an option.