A novel DSP-based LVDT signal conditioner

Ralph M. Ford, Robert S. Weissbach, David R. Loker

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


A novel signal conditioning system for linear variable differential transformers (LVDTs) is presented. This system considers the signals involved in the operation of the LVDT to be analogous to a double sideband suppressed carrier AM (DSBSC-AM) communication system, where the position information is akin to the signal to be transmitted and the input sine wave excitation to the LVDT is akin to the carrier wave. Signal conditioning is achieved through a modified digital signal processor-based Costas receiver. This system has better dynamic response than existing solutions and better noise rejection than commercially available solutions. Static testing of the system using both 4-wire and 5-wire LVDTs verifies that the conditioner meets or exceeds the linearity performance of existing signal conditioning systems over the full-scale operating range. In addition, this system requires no phase compensation network or manual tuning.

Original languageEnglish (US)
Pages (from-to)768-773
Number of pages6
JournalIEEE Transactions on Instrumentation and Measurement
Issue number3
StatePublished - Jun 2001

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Electrical and Electronic Engineering


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