A LOW-COST FREQUENCY-MULTIPLIER FOR SYNCHRONOUS SAMPLING OF PERIODIC SIGNALS

The theory of digital signal processing indicates clearly that the measurements performed on periodic signals by means of digital techniques are affected by an error due to the nonsynchronization between the sampling frequency and the signal frequency. This paper presents a low-cost device, based on a frequency multiplier, that allows the generation of sampling pulses synchronized with the signal frequency. The behavior of this device in analyzed in order to assure its capability to work with input signals in the frequency range typical of the mains. As an example of application of this device, the results of the Fourier analysis on a multifrequency signal are given, showing the high accuracy that can be attained.