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AC coupled photodiode TIA
Related Posts

  • Forum Post: Re: Need suggestion on design of photodiode preampilfier

    Bruce Trump
    Richie, Capacitive coupling in this way will cause C1 to charge to a DC voltage that will forward bias the photodiode. It would not produce your desired result. It would be better to perform the AC coupling after the transimpedance amplifier. Are you able to AC couple the signal after the transimpedance...
    on Feb 24, 2012

  • Forum Post: Re: Photodiode AC Amplifier

    Bruce Trump
    Vianney, Are you detecting the signal from an LED or laser? The first and easiest step in improving the ratio of AC signal to DC background light may come from optical filtering. A narrow wavelength filter can greatly reduce the background signal level. The first link you provided in your message...
    on Apr 15, 2012

  • Forum Post: RE: Photodiode AC Amplifier

    Amit Patel
    Hello Bruce, I have implemented your design idea into my photodiode application. My question is what is the purpose of the T1 and U2? Does it tottaly blocks the ambient light? I tryinging to detect modulated green led from the unit. and display the serial data on hyper terminal. Thank you for your...
    on Aug 10, 2012

  • Forum Post: Photodiode

    Amit Patel
    Hello, Could anyone please explain what is the purpose of T1? what it does? How does it do it? Wouldn't it make Vout to oscillate or Photo diode? I guess i don't understand properly the role of U2 and T1. Thank You, Amit
    on Oct 3, 2012

  • Forum Post: Noise analysis of OPA376

    Nisha Joshy
    Hi, I am using OPA376 as a photodiode TIA in single supply (+5V) mode and the postive terminal is biased to a reference voltage between 1.5V and 2.5V. A 1M resistor and 1.5pF capacitor forms the feedback network. I am trying to analyse the noise with a spectrum analyser (HP-3585A). No input is given...
    on Oct 5, 2012

  • Forum Post: AC coupled photodiode amplifier: differences on 2 different circuits

    Gabriele Clapier
    Hi, I have designed 2 different circuits that amplifies an AC signal superimposed to a large DC signal coming from a photodiode (AC signal coming from an I.R LED + DC signal coming from the sun). In the AC coupled circuit the photodiode is always reverse biased because 10k x Idiode_dc < Vbias...
    on Nov 7, 2012

  • Forum Post: RE: AC coupled photodiode amplifier: differences on 2 different circuits

    Bruce Trump
    Gabriele, You are correct that the first circuit keeps the photodiode reverse biased up to 0.5mA DC photodiode current. Throughout the range from zero current to 0.5mA, however, the reverse bias is varying. This may be undesirable in critical applications. I believe that the presence of R1 at the...
    on Nov 7, 2012

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