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Circuits Sensor Interface & Bias Light Sensors & Photodiodes Photodiode Interface & Transimpedance Amps
Circuits Signal Conditioning Operational Amplifiers (Op Amps) Low Bias Current Amplifiers

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Logging Photodiode JFET Amplifier with 1pA Input Bias Current

View Full Size Image View Original Design Note Logging Photodiode JFET Amplifier with 1pA Input Bias Current

The 1pA input bias current contributes only 0.4fA/rtHz of current noise or 0.4nV/rtHz voltage noise with a 1Mohm source impedance. Photodiode current is converted to a voltage by the first op amp and D1 and amplified by the first, second and third logarithmic compression amplifiers.



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