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  • RE: OPA858: Transimpedance Amplifier Output Oscillation

    Hi João, I appreciate your patience while we work through trying to find a solution to the oscillation issues you are seeing, and I appreciate your very detailed responses. Based a previous response, I was under the assumption that when you isolated…
    • Answered

  • OPA858DSGEVM: OPA858

    Resolved
    Part Number: OPA858DSGEVM Hi, I purchased an OPA858DSGVEM board recently. I tried to connect Split sources, GND, and keep J4 on. I only used the Negative input (J1) and make the Positive side(J2) floating. Unfortunately, I cannot get anything from the…
    • Resolved

  • RE: OPA858: Amplifier Develops Unstable Ringing Behavior After Some Time

    Matthew, Firstly can you check Iq and input bias current in the damaged chip? How it changed from the fresh chip? To further root cause it, it would be better if you can ship some damaged unit to us. I will contact you separately over email for that. …

  • RE: PSPICE-FOR-TI: OPA858, TLV3603

    Thanks JC. Hi Michael, For our models, when the input range is violated, we have the output go to mid supply as an error condition. Looks like the input is going negative which violates the input range. In terms of long simulation time and convergence…
    • Answered

  • OPA858: OPA858

    Resolved
    Part Number: OPA858 I am looking for a list of all the available macro models for opamps
    • Resolved

  • OPA858: How to Place the AC-coupling capacitance and resistance in a TIA circuit in PCB layout

    TI Thinks Resolved
    Part Number: OPA858 I am planning to use OPA858 as the Transimpedance Amplifier for the following TIA circuit. C2， R8 are to AC couple the circuit: In the data sheet of OPA858, it recommends using this layout with Riso in order to reduce the resonance…

  • OPA858: PSpice Noise Simulation

    Part Number: OPA858 Other Parts Discussed in Thread: THS4541 Hello all, I am trying to simulate the noise of the following circuit. The circuit has a transimpedance amplifier (TIA - OPA858) and a fully differential amplifier (FDA - THS4541). However, I…

  • RE: OPA858: Design of a low noise, extremely high bandwidth transimpedance amplifier

    Hi Sima, Thank you for the clarification. How do I calculate the value of my output isolation resistor? Following this thread you linked: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/987143/opa858-another-photodiode-amplifier…

  • RE: OPA858: how to expand

    Hi Chi, for a bandwidth of 100MHz I would make it this way: I would leave the feedback loop of OPA858 untouched and would make all the gain switchings later in the signal chain. Kai

  • RE: OPA858: DC Offset Errors ???

    Hi Kai / Sima, thank you both for the above and sorry that it's taken me a while to get back to you both ( I've been diverted onto another project this past week ). Taking inspiration from your collective thoughts, I think I now understand the…

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