Temperature-stabilized inductor-capacitor parallel resonant circuit for use in inductive distance sensor, has coil with output resistor, where negative valve of negative resistor corresponds to value of eliminated output resistor

摘要

The circuit has an oscillator coil with a temperature-dependent output resistor (Rs). An electronically produced negative resistor is connected in series to the coil for compensation of attenuation portions of the coil, where a negative valve of the negative resistor corresponds to a value of the output resistor that is eliminated. A device is provided for control or regulation of the negative resistor in such a manner that a variable output resistor is neutralized. A measuring device measures a voltage over a series circuit from the output resistor and the negative resistor. Independent claims are also included for the following: (1) an inductive distance sensor comprising a comparison device (2) a method for neutralization of an output resistor with a resonant circuit.