Author(s)

Yan Huang, Anquan Deng, Tianyu Zhou, Wu Zhu

Corresponding Author

Wu Zhu

Abstract

When the RMS measurement is performed on a wideband AC signal using a log-antilog operation circuit, a large nonlinear error is generated by the band limitation of the amplifier in the converter. Therefore, a new method for calibrating nonlinear errors using hardware calibration and software alignment is proposed. First, the hardware circuit with the voltage-frequency conversion chip VFC32 as the core is used for nonlinear calibration. The calibrated signal is then fitted using a least squares support vector machine. The test results show that the calibration accuracy can be achieved 0.014% within the frequency range of 50~20 ×103Hz.

Keywords

Rms Converter, Nonlinear Error, Error Calibration, Hardware Compensation Method, Least Squares Vector Machine Algorithm