Oscillator/demodulator circuit for an inductive proximity switch

Details Oscillator/demodulator circuit for an inductive proximity switch Oscillator/demodulator circuit for an inductive proximity switch

1986-06-19

1989-02-21

LaRoche, Eugene R.

Oscillators

With device responsive to external physical condition

331117R, G01V 311, H03B 512

Patent

active

048068829

ABSTRACT:
An oscillator/demodulator circuit for an inductive proximity switch includes a transistor amplifier stage having an input circuit and an output circuit, a resonant circuit connected in the input circuit of the transistor amplifier stage, a device for damping the resonant circuit, a device for providing positive feedback from the output circuit to the input circuit of the transistor amplifier stage, a limiter branch connected in the input circuit of the transistor amplifier stage, a dual current mirror active in the input circuit of the transistor amplifier stage having first and second interconnected current mirrors including transistors. It further has a circuit output connected to the current mirrors for receiving currents supplied by the current mirrors being subtracted from each other, the transistors in the second current reflector having a larger emitter area ratio than the transistors in the first current mirror, and a resistance network connected to the oscillator/demodulator circuit output being switchable for providing an adjustable hysteresis.

REFERENCES:
patent: 3350660 (1967-10-01), Engdahl et al.
patent: 4543527 (1985-09-01), Schuchmann et al.
patent: 4609882 (1986-09-01), Gehring et al.
patent: 4663542 (1987-05-01), Buck et al.
Zulauf, "Electronique et Microelectronique Industrielle", Jun., 1975, pp. 54-56.

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