Dangling the TLV431 shunt voltage reference Z1 from the 15 volt supply is a shortcut toward implementing a noise- and cable length- tolerant current mode output

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Other Materials from the Main Document

• Article «Position sensor gets linear 4 to 20mA current source output»
• Figure 1. U1a and U1b cross-coupled Schmidt trigger timers form a ~1 MHz RC multivibrator. The T_SEN pulse width is inversely proportional to sensor displacement
• Figure 2. Averaging integrator A1 implicitly computes the output voltage needed to linearly balance the charge transferred onto C1 during T_REF through discharge during T_SEN
• Figure 3. Dangling the TLV431 shunt voltage reference Z1 from the 15 volt supply is a shortcut toward implementing a noise- and cable length- tolerant current mode output
• Figure 4. In this graph, black = sensor readout d in mm, and red = the nicely constant 4 microamps per micrometer resolution