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High-Precision Sine/Cosine Interpolation

Authored on: Jan 24, 2014 by Joachim Quasdorf

Technical Paper

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For speed control or positioning, drive controllers today demand high-resolution magnetic or optical position sensors which require special integrated circuits for sensor signal conditioning and sine/cosine-to-digital conversion. This white paper describes the methods and challenges of the "interpolation" using sine/cosine-digital conversion (S/D conversion), it discusses sensor-related measuring errors as well as their compensation, and it illustrates the latest chip solutions and their selection.

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