A Parametric Operational Amplifier

Varactor bridge circuit achieves 10-12 amps input current and 10-14 amps current noise . . . a tenfold improvement over the best FET operational amplifiers.

The 301 operational amplifier was designed to amplify the current in the picoampere range. Logarithmic and integrating circuits and a wide range of transducers including p-h electrodes, ion detectors and photomultiplier tubes are typical applications. Read full article



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L. R. Smith