Signal conditioning circuit for low amplitude, high common mode

Details Signal conditioning circuit for low amplitude, high common mode Signal conditioning circuit for low amplitude, high common mode

1997-01-16

1999-01-19

Mullins, James B.

Amplifiers

Sum and difference amplifiers

318678, 330156, 330258, H03F 345, G05F 100

Patent

active

058617752

ABSTRACT:
A cost-effective conditioning circuit for extracting a weak, floating, wide-band signal with a low common-mode voltage from noisy environments is proposed that includes a high gain single ended operational amplifier to increase the amplitude of the signal. A simple, cost-effective approximately unity gain differential amplifier stage is used to level-shift the signal down to the desired reference potential. A typical application is a motor drive system, where the signals to be measured are bi-directional motor currents.

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"Methods Of Current Measurement", Sensors, Oct. 1996, pp. 99-105.

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