The output voltage increasing technology circuit with precision logarithmic and logarithmic ratio amplifier LOG102

Published:2012/8/28 2:53:00 Author:Ecco | Keyword: output voltage , increasing technology, precision, logarithmic , logarithmic ratio , amplifier | From:SeekIC

In many optical sensor detection applications, the output voltage increasing technology is just as important as increasing the photodiode current. In the Figure, the circuit uses a reference current generated by a large reference voltage source to adjust the error caused by LOG102 input offset voltage error to minimum; the reference current IREF flows into I1, the photodiode current IPHOTO flows into I2, IREF is designed to be greater than IPHOTO. The role of the internal amplifier A3 is to produce inverted gain level shift for calibration input photodiode current and corresponding the A / D converter input range.



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