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100dB Range Logarithmic Photodiode Amplifier

100dB Range Logarithmic Photodiode Amplifier

The photodiode current is processed by a form of trans-impedance amplifier (TIA) that has a logarithmic I to V characteristic. The Vbe of the logging transistor is scaled and offset to properly represent the desired dynamic range. To prevent temperature variation from affecting the accuracy, another loop is used as a stabilized chip heater for the transistor array.

 

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