Magnetoresistive Linear Position Measurement (CN0341)

The circuit shown in Figure 1 provides a contactless, AMR (anisotropic magnetoresistive) linear position measurement solution with 2 mil (0.002 inch) accuracy over a 0.5 inch range. The circuit is ideal for applications where high speed, accurate, non-contact length and position measurements are critical.

The circuit provides all necessary signal conditioning including instrumentation amplifiers, buffers, and a dual channel ADC that efficiently process the AMR sensor low level bridge outputs.

The result is an industry leading position measurement solution suitable for valve and flow measurement, machine tool speed control, motor speed measurement, and other industrial or automotive applications.

Figure 1. Magnetoresistive Linear Position Measurement System (Simplified Schematic: Decoupling and All Connections Not Shown)


  • MR Linear Position Measurement
  • Single Supply
  • Small Footprint


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Magnetoresistive Linear Position Measurement  CN0341