Analog Circuit Design Volume Three

Chapter 487

Precision LVDT signal conditioning using direct RMS to DC conversion

Cheng-Wei Pei

Abstract

Precision linear variable differential transformer (LVDT) signal conditioning using direct RMS to DC conversion is discussed.

Keywords

Linear variable differential transformer

LVDT

LVDT signal conditioning

LTC1967

Introduction

Linear variable differential transformers (LVDTs) are theoretically infinite-resolution displacement measurement devices. An LVDT operates by comparing the magnetic flux coupled into two transformer secondary windings to determine the displacement of a moving transformer core. A low distortion sine wave acts as the input. The amplitude and phase of the output signal across the two secondary windings determine ...