Electronic circuit for detecting a change relative to a...

Details Electronic circuit for detecting a change relative to a... Electronic circuit for detecting a change relative to a...

2005-01-25

2005-01-25

Decady, Albert (Department: 2133)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C331S046000

Reexamination Certificate

active

06847215

ABSTRACT:
An electronic circuit for detecting a change with respect to a quiescent condition, which includes an oscillation circuit including a first and a second oscillator circuit, each oscillator circuit includes an oscillator input terminal and an oscillator output terminal on which an oscillation signal is present. The oscillator input of the first oscillator circuit is coupled with the oscillator output of the second oscillator circuit, and the oscillator input of the second oscillator circuit is coupled with the output of the first oscillator circuit. A detection circuit includes a first and a second detection circuit, each circuit further includes a detection input terminal and a detection output terminal on which a detection signal is present, while the detection circuit is arranged for detecting a change between the oscillation signals of the two oscillator circuits as a result of an external influence. The circuit is suitable for applications where otherwise a capacitive, inductive or Hall sensor is used as a proximity switch.

REFERENCES:
patent: 4574936 (1986-03-01), Klinger

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