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

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Very Low Noise Large Area Photodiode Amplifier

View Full Size Image View Original Datasheet Very Low Noise Large Area Photodiode Amplifier

Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. AC coupling a bootstrap JFET across the photodiode clamps the diode capacitance and also allows a controlled DC reverse bias potential to be applied to the photodiode. This can optimize the sensitivity of the photodiode to light.



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