Processing circuit for use with DC-voltage-output type sensors

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307262, 307240, 307491, H03K 522, H03K 1756

Patent

active

048662976

ABSTRACT:
A processing circuit for use with DC-voltage-output type sensors comprising: a preamplifier; an automatic polarity-switching means coupled to the sensor and the preamplifier for switching the connection condition between a non-polarity-inversion condition and a polarity-inversion condition; and a controlling-measuring means for controlling the automatic polarity-switching means in carrying out the switching alternately between the non-polarity-inversion condition and the polarity-inversion condition, and for measuring the difference between the output of the preamplifier under the non-polarity-inversion condition and the output of the preamplifier under the polarity-inversion condition, thereby cancelling the effects of the input offset voltage of the preamplifier and the offset voltage of the preamplifier and the offset voltage generated by the input bias current and the resistance of said DC-voltage-output type sensor.

REFERENCES:
patent: 3624414 (1971-11-01), Van Dijk
patent: 3947699 (1976-03-01), Whitmer
patent: 4068138 (1978-01-01), Miyakawa et al.
patent: 4354235 (1982-10-01), Blakeslee

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