Temperature stabilized oscillator and proximity switch containin

Details Temperature stabilized oscillator and proximity switch containin Temperature stabilized oscillator and proximity switch containin

1997-06-13

2000-02-29

Kinkead, Arnold

Oscillators

With device responsive to external physical condition

331176, 331167, 331 66, H03K 1795, H03L 102

Patent

active

060314303

ABSTRACT:
In an oscillator comprising a resonant circuit (L, C, R.sub.CU) and an amplifier circuit (V, R.sub.1, R.sub.2, R.sub.3) connected as a negative resistance (R.sub.n), a direct current source (I.sub.1) is connected in series with the resonant circuit (L, C, R.sub.CU). In this way, a signal (U.sub.CU) is provided being a measure for the resistance of the oscillator circuit coil (L). By using this signal (U.sub.CU), a control circuit (V.sub.1, M; V.sub.2, V.sub.3, M) controls the negative resistance (R.sub.n) inversely proportional to the resistance (R.sub.CU) of the oscillator circuit coil (L). This affords a simple stabilization of the temperature behavior of the oscillator circuit (L, C, R.sub.CU) and allows the low price manufacture of inductive proximity switches having a great switching distance which function safely in a broad temperature range.

REFERENCES:
patent: 4509023 (1985-04-01), Heimlicher
patent: 5043679 (1991-08-01), Kriz et al.
Patent Abstracts of Japan, vol. 017, No. 378, (1993) JP 5-063559.

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