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  • OPA858: Unwanted spurs

    Part Number: OPA858 Hello, I have designed a AC-coupled non-inverting amplifier circuit as shown in the picture below. Thanks to the help of this forum the amplfier itself is stable and so far the results are quite promising. However when i do a spectrum…

  • OPA858: OPA858, is there a part similar to this CMOS high-speed op-amp that works with higher supply voltage rails

    Part Number: OPA858 Other Parts Discussed in Thread: OPA847 , OPA818 , OPA659 , OPA657 I love the OPA858 with it's high bandwidth, slew rate, low noise voltage density and low input capacitance. Does TI have an op-amp with similar specs to the ones I…

  • OPA858: AC coupled OPA858 non-inverting amplifier shows instable behaviour

    Part Number: OPA858 Other Parts Discussed in Thread: OPA818 Hello, I want to setup an AC-coupled noninverting amplifier based on the OPA858 operating from a single 5V supply with an overall passband gain of 76V/V (37,6dB) and a minimum bandwidth of fCT…

  • RE: OPA858: A switched transimpedance circuit (simulation Pspice for TI)

    Hello Libin, Sorry for the very long delay on this. I have an issue on my end with PSpice for TI that is going through some fixing, so I had to switch over to Tina-TI. The below images/simulations are from Tina-TI, but you can continue using Pspice for…

  • RE: OPA858: About Riso of opa855 and opa858 for TIA

    Hi Sima Yes, it is. I'm talking about this diagram. In the explanation of this diagram, it says this about Riso ” Add an isolation resistor RISO as close as possible to the inverting input of the amplifier. Select the value of RISO to be between…

  • OPA858 Floating Node on LTSpice

    Other Parts Discussed in Thread: OPA858 , THS4541 Hi All, I exported the OPA858 model into LTSpice but when I run a simulation I have the following problem: ERROR: Node U1:I0:I21:1:102 is floating and connected to current source G:U1:I0:I21:1:RA ERROR: Node…

  • OPA858: High Speed Substructing Op-Amp followed with comparator to 400mV

    Part Number: OPA858 Other Parts Discussed in Thread: LMV861 , , THS3217 , THS3215 , OPA356 , LMV7219 Hi, i'm trying to find a suitable substracting OpAmp that will allow me to substract two DC signals that represent the output power of a PA, these signals…
    • Answered

  • OPA858: Use of PIN Diodes in Design

    Resolved
    Part Number: OPA858 Hi Team, Our customer would like to ask if it is possible to use PIN diodes in lieu for the APD diodes in designing with OPA858? Asking for this possibility as PIN diodes are much cost-efficient solution and doesn't require high voltages…
    • Resolved

  • RE: OPA858: Another Photodiode Amplifier for Short (1-2ns) Laser Pulse

    Hi Raymond, well, the major issue here is that the photodiode is distanced too far away from the OPA858. Move the photodiode as much to the OPA858 as you can Also, I would ground the metal housing of photodiode. Kai

  • OPA858: OPA858

    Part Number: OPA858 Dear team, I want to confirm if it works when add V+ 3.3V, IN(+) to GND, IN(-) to APD? Thanks. Best regards, Sammi

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