Instrument amplifier (INA101) circuit with expandable common mode range

Published:2011/7/25 1:59:00 Author:Christina | Keyword: Instrument amplifier, expandable, common mode range | From:SeekIC

The instrument amplifier (INA101) circuit with the expandable common mode range is as shown in the figure. In this circuit, the A1, A2 and A3 are composed of the high precision instrument amplifier INA101 or INA102. In this figure, the voltage magnifications of the A1, A2 and A3 are l00 times, the post-amplifier uses the precision unit gain amplifier INA105, the connection of this amplifier is the in-phase port input and follower output model, the four resistances of the circuit are in parallel, so this INA105 amplifier can get the 2 times of voltage magnification and extremely high input impedance.



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