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OPA855: Inquiry About Using Current-Feedback Operational Amplifiers in Optical Front-End Systems

LIU YINGBO
Prodigy 10 points
Part Number: OPA855

Dear TI Technical Support Team,

I hope this message finds you well.

       I am currently working on designing optical front-end systems. Recently, I have been exploring the use of current-feedback operational amplifiers (CFOAs) in the design of transimpedance amplifiers. However, I have found very few examples or references supporting this approach, which has left me uncertain about its feasibility.

I would like to seek your advice on the following questions:

  1. Can current-feedback operational amplifiers be effectively used as transimpedance amplifiers? If so, are there any specific design considerations to keep in mind (e.g., stability, noise characteristics, or bandwidth limitations)?
  2. Does TI have any recommended CFOA models suitable for transimpedance amplifier designs in optical front-end systems?
  3. If CFOAs are not ideal for this application, could you suggest more appropriate solutions or alternatives?

I truly appreciate the exceptional support TI provides in the field of operational amplifier technology. I look forward to your professional advice to help advance my project

  • 0
    TI__Expert 6745 points

    Hi YINGBO,

    We will contact you later.

  • 0 回复 Taylor
    TI__Expert 6745 points

    Hi YINGBO,

    We typically do not recommend using a current feedback amplifier in a TIA application for a couple reasons. The first reason being that compensating the circuit becomes more difficult than when using a voltage feedback device. There are also relatively large bias currents with current feedback devices compared to voltage feedback devices, which will be seen as a direct error at the output as this current is also taken into account and gained with Rf. This also applies to the larger noise that is experienced with current feedback devices. Because of this we usually advice customers to look into our voltage feedback devices or our integrated TIA devices. Is there specific performance metrics you are looking to hit?