Digital phase and frequency meter

Vollständiger Abstract

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This paper presents a phase difference and frequency meter developed on the basis of a digital parametric method that allows updating the estimates of the phase difference and frequency of signals within the sampling interval. The method used is briefly described, and both a schematic diagram and a block diagram of the meter operation are provided. Measurement error estimates are presented, along with an analysis that enables determination of the meter operating range. It is determined that the minimum error is achieved when the sampling rate is four times higher than signal frequency. Under this condition, the relative errors of frequency and phase difference measurement are 10-5 and 6·10-5, respectively. In addition, an example of using the device for measuring the phase frequency response of linear circuits with a sweep frequency generator is demonstrated.