New current-mode RMS-to-DC converters and four-quadrant multiplier/divider based on VDTA

Abstract

The study presents two new realisations of bipolar two-quadrant implicit RMS-to-DC converter and four-quadrantmultiplier/divider employing two VDTAs (voltage differential transconductance amplifier) and grounded passive elements. Theconverters provide the operating frequency of up to 10 MHz with increased precision in the processing of input currents signals,when compared to known realisations. Errors related to the signal processing and errors bound were investigated andpresented in this study. The results obtained from the simulation tests in HSPICE and the experimentally realised models of theconverters showed a good match with the theoretical anticipation. The maximum power consumption of the converters is 2.82 mW, at ±1.2 V supply voltages.