Automatic zeroing amplifier circuit composed of OPA2111BM

Published:2011/5/16 9:52:00 Author:Rebekka | Keyword: Automatic zeroing amplifier | From:SeekIC

Automatic zeroing amplifier circuit is shown as above. OPA2111 low bias (≤ ± 4pA), its setting up time is very short (1μs established to 0.01% accuracy), the noise is very small (8nV / (Hz) 1 / 2, 10kHz). It passes the automatic zeroing set can keep the offset voltage less than 5μV. Zero drift ≤ 0.028μV / C, converting to the input terminal and the zero potential regulation rate is ≤ 2μV / s. If you appropriately reduce the integration capacitor C, the zero potential adjusting speed can be improved. The voltage amplification factor is Av =- RF/R1 =- 100.



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