Oscillators – With device responsive to external physical condition
Patent
1985-07-12
1986-09-02
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
324207, 324236, 324327, 331117R, G01V 311, H03B 512
Patent
active
046098828
ABSTRACT:
An oscillator/demodulator circuit arrangement for an inductive proximity switch with a transistor amplifier stage having an input circuit containing an attenuatable resonance circuit and having an output circuit, with a regenerative feedback from the output circuit to the input circuit of the transistor amplifier stage, the input circuit of the transistor amplifier stage having a limiter branch therein, includes a double current mirror operatively connected in the input circuit of the transistor amplifier stage and including a first and a second current mirror coupled to one another in a manner that currents supplied thereby are subtracted from one another at a circuit output, the transistors in the second current mirror having a larger emitter surface ratio in comparison with the emitter surface ratio of the transistors in the first current mirror.
REFERENCES:
patent: 4001718 (1977-01-01), Wilson et al.
patent: 4543527 (1985-09-01), Schuchmann et al.
Electronique et Microelectronique Industrielle, Jun. 15, 1975, pp. 54 to 56.
L'Electricite Electronique Moderne, vol. 44, No. 280, Apr./May 1975, pp. 66 to 68.
Gehring Gerhard
Hodlmayr Franz
Greenberg Laurence A.
Grimm Siegfried H.
Lerner Herbert L.
Siemens Aktiengesellschaft
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