Title :
Stray-Effect-Free Direct Impedance-to-Frequency Converter
Author :
Kanno, Makoto ; Horikawa, Toshiro
Abstract :
A variety of oscillator circuits which employ three- or four-terminal impedance sensors is introduced. An example showed that the capacitance-frequency characteristic obtained with a variable capacitor attached to the circuit was unchanged even when the capacitor was separated 7.5 m away from the circuit by two coaxial cables.
Keywords :
Admittance; Capacitance measurement; Capacitive sensors; Capacitors; Circuits; Electrical resistance measurement; Impedance; Oscillators; Temperature sensors; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1978.4314724
