Current Feedback Amplifiers

Current Feedback Amplifiers

  • Dobromir Dobrev added an answer:
    Do "Exotic" amplifiers even exist?

    Based on your experience (or why not? your hobby) as researchers, engineers or teachers involved in electronics, perhaps you have seen electronic designs which puzzled you trying to understand how and why those works.

    Acording to Miriam Webster dictionary,  "exotic" means: very different, strange, or unusual. The term is coming from Latin exoticus, from Greek exōtikos, and it's first known use is 1599. Good synonims for "exotic" are bizarro or fantastic.    :)

    I have opened this topic as an answer to Cyril Mechkov and his topic: "What is the truth about the exotic current feedback amplifier?"

    You are encouraged to post here the "exotic" amplifier structures (links or papers) you have experimented and tested in your real life trying to understand everything about those.

    Dobromir Dobrev

    this link:
    it is from your previous post. I'm not sure that results are correct, but it generates some plots.

  • Bajece Balkan Journal of Electrical added an answer:
    Has anyone used the Hitachi nanopico absorbed current meter/mapper?

    Hello, I have a Hitachi S3500N tungsten SEM and im interested in mapping  DC current distributions in my samples. My Hitachi affiliate offerd me an equipment that they make called the "NanoPico". it is a current amplifier that has an output that can be connected to the SEM to obtain an image. My question is if any one has used it could you provied your insight or perhaps examples. or if any one knows of another option that would be helpful too. 

    Thank you

    Victor I Hernandez

  • Lutz von Wangenheim added an answer:
    What is the difference between CFA and CFOA?

    This is not a pure technical question but - more or less - a question when and how these shortcuts are commonly used.
    I know the meaning behind CFOA - Current Feedback Operational Amplifier. And I also know why and how it works, but - on the other hand - we are using also the shortcut CFA (Current Feedback Amplifier).
    Interestingly, some authors are using „CFOA“ for some special applications only.
    And, therefore, my question: Two shortcuts for the same device, or is there a difference?

    Lutz von Wangenheim

    @ Sr. P.A.Martinez:

    If I am not wrong - this text was submitted already 12 days ago.

    Submission error?

  • William M Connelly added an answer:
    Does anyone have knowledge on Grass Instruments Model P16 Micro Electrode DC Amplifer?

    Does anybody has the manual for Grass Instruments Model P16 Micro Electrode DC Amplifer?. It would be possible to use it for extracellular recording?

    William M Connelly

    I don't have a manual, but I would certainly think it could perform field or EEG recording. Just keep the capacitance compensation off (or very low)

  • Sujit K. Biswas added an answer:
    What is the virtual ground in an op-amp in a open loop configuration and in feedback configuration?
    With diagram if possible.
    Sujit K. Biswas
    Ground in an electronic circuit refers to the common reference point for power supply and signals. In an open loop op-amp circuit, there is no concept of 'virtual ground'. However, in an op-amp with negative feedback such that it behaves as an amplifier, the inverting input maintains exact potential as that of the non-inverting input. Now, if the non-inverting input is physically connected to ground (as is done in most cases), the inverting input is said to be at 'virtual ground' since it has the same potential as ground without being physically connected to the ground.
  • Robert John Taylor asked a question:
    Does anyone have a practical amplifier circuit diagram for use with an InGaAs avalanche diode? - Free Space Optical link
    We are thinking of using a Hamamatsu G8931 - 20 avalanche diode and a transimpedance amplifier such as the MC2007-3. Any suggestions?

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