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transimpedance amplifier
Related Posts

  • Forum Post: Guard Ring

    Andreas Zoellner
    Hello I am designing an photodiode amplifier with an OPA129. I have a question regarding the guard rings mentioned in the document http://focus.ti.com/lit/ds/symlink/opa129.pdf Figure 3 shows how to route the guard ring on the pcb, Figure 2 shows where to connect it. In my case with an inverting...
    on Jul 30, 2010

  • Forum Post: Re: Good OpAmp choice for TIA in UI panel?

    Neil Albaugh
    Tom; Bruce's suggestion is a good one to follow. If, however, you have problems with the multiplexing your photodiodes into a transimpedance amplifier, you might consider using a transimpedance amplifier for each photodiode and placing the multiplexer at the output of the amplifiers. To prevent...
    on Jun 5, 2011

  • Forum Post: Re: Photodiode transimpedance amplifer

    Bruce Trump
    Ali, It appears that you have sufficient current from the photodiode to drive the output of the op amp to the negative rail. With strong overdrive, the voltage on the anode of the photodiode will change (go more positive) and this will slow the recovery time of the circuit. You could use a lower value...
    on Dec 19, 2011

  • 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: OPT101 photodiode responsisivity at 470nm ???

    albert torres
    I have a medical application where i need to measure the irradiance of a source light with a wave length of 470nm,and I have some ambient noise (sun and fluorescent lights) I have already filter the ambient noise and I have a good reading of the irradiance all I need to know is the responsivity at 470nm...
    on Apr 15, 2012

  • Forum Post: Using PSpice model for OPA140 or OPA2140

    Wayne Chu
    Hi all, I am using OPA2140 as my 2nd stage of my transimpendance amplifier (reference: http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/158884.aspx#584443 ). Following the SLOA070 guide, I successfully imported the Spice Model in PSpice and changed it symbol to a triangular shape accordingly...
    on Feb 10, 2012

  • Forum Post: RE: Help with TL082 opamp with very low input signal change

    Bruce Trump
    Tim and Fausto, The OP27, OP37-type op amps (and their successors) have quite high input bias current and current noise. They are not well-suited to a transimpedance circuit with a 10M feedback resistor. A FET-input op amp is the correct choice in this case. The OPA627 and OPA827 are good recommendations...
    on Mar 20, 2013

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