Low-noise instrumentation amplifier circuit composed of OPA37

Published:2011/5/12 6:21:00 Author:Rebekka | Keyword: Low-noise instrumentation amplifier | From:SeekIC

Low-noise instrumentation amplifier circuit composed of OPA37 is shown as above. This circuit uses a low noise precision op amp as a pre-OPA37 differential input stage. And it uses precision unity gain amplifier INA105 as the output level. The overall gain of the circuit is Av = (1 +2 RF/R3) × 1 = 1 +2 × 5/0.1 = 100 times. The offset voltage is about 10/μV. The common mode rejection ratio is about 106dB. The bandwidth is about 500kHz.



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