ldc sensor design - texas instruments.pdf

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ldc sensor design - texas instruments

Application Report SNOA930– March 2015 LDC Sensor Design Chris Oberhauser ABSTRACT Getting the best performance out of an LDC requires a sensor suitable for the measurement. This app- note covers the parameters to consider when designing a sensor for a specific application. Specific areas of focus include the physical routing characteristics of PCB based sensors, considerations for the sensor capacitor, and techniques to minimize or compensate for parasitic effects. Contents 1 The Sensor 3 2 Inductor Characteristics 5 3 Capacitor Characteristics 19 4 Physical Coil Design 20 5 Summary 23 6 References 23 List of Figures 1 Sensor Frequency vs. Inductance and Capacitance 3 2 RS and RP 4 3 RLC Model 5 4 Axial Sensing with Circular Spiral Inductor 5 5 Rectangular Coil is Insensitive to a Y-axis Shift 6 6 Trapezoidal Inductor for Rotational Encoding 7 7 “Stretched” Rectangular Coil for lateral Position Measurement 8 8 Flat Circular Spiral Inductor 8 9 Inductance vs. Number of Turns for 18mm Circular Inductor 9 10 Multiple Layer Inductor Construction (Series) 10

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