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OPA129
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  • 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: Photodiode Amplifier problem

    alley1122
    hello! I do not have a lot of basic electronics background but I need a simple photodiode amplifier circuit for my project. The optical beam received has intensity of a few microwatts and the photodiode amplifier circuit is needed to convert the optical signal into a voltage one. I am using a Hammamatsu...
    on Aug 12, 2010

  • Forum Post: Re: Guard Ring

    JACR
    In the past two days I've been reading every document possible about Guarding and i always get to the same point with the same questions (until i got here and realized Andreas and Mariana had the exact same problem). If im getting it correctly, Guarding should be done in both sides of the PCB...
    on Apr 17, 2011

  • Forum Post: Re: Guard Ring

    JACR
    Ty very much Bruce and Cypher but now i have the last question If im not making a sub-picoampere measurement, it is necessary to make guard rings? (im not taking the easy way out here, i only think it would be possible that i will increase the problem somehow) I need to make two precision measurements...
    on Apr 19, 2011

  • Forum Post: Re: Extremely sensitive electrometer for Mass Spectrometry detection

    Neil Albaugh
    Derek; The OPA129 electrometer-grade op amp has very low input bias current as is, but you can reduce it further by cooling the device with a small Peltier cooler. If the cold side of the cooler is placed on top of the package and bonded in place with a good low-outgassing thermally-conductive epoxy...
    on Jun 23, 2011

  • Forum Post: Re: Extremely sensitive electrometer for Mass Spectrometry detection

    Neil Albaugh
    Derek; Yes, A Peltier cooler would be somewhat of a PITA but when dealing with Heroic measures for reducing input bias current it is worth looking at. By cooling the INA129, its input bias current is reduced as is its current noise; if you also cool the high value feedback resistor, its thermal noise...
    on Aug 1, 2011

  • Forum Post: Re: Photodiode - op-amp questions

    Neil Albaugh
    Michael; Which Hamamatsu S1336 photodiode are you using? There are a number of different versions of the model photodiode, varying in active area from 1.2 sq mm to 33 sq mm. These are fairly large photodiodes, consequently they have from 20 to 380pF zero bias capacitance-- a critical limitation on...
    on Sep 23, 2011

  • Forum Post: Re: INA116 for electrometer application

    L���szl��� Boromisza
    Dear Bruce and Neil! Thank you for your advice! I'll consider using OPA129 instead. By the way, to answer your question: it would measure the current of an ionisation chamber in the range of 5 nA - 100 pA. The bandwidth is not critical, since it should be a "classical", first...
    on Oct 11, 2011

  • Forum Post: Re: Choosing a transimpedance amplifier to replace OPA111

    Neil Albaugh
    Wayne; You're probably right-- I see that you did not need much BW in your first stage so a lower input bias current op amp would be a better choice; the OPA129 has extremely low Ib so it should do nicely. Another one to keep in mind for this type of application is an OPA320. It has low Ib...
    on Jan 20, 2012

  • Forum Post: Re: Choosing a transimpedance amplifier to replace OPA111

    Neil Albaugh
    Wayne; One further thought-- if you need even lower input bias current, try cooling the transimpedance amplifier with a small Peltier cooler. The Ib and current noise of an OPA129 will improve down to about -40C. While you're at it, cool the 1G feedback resistor, too-- its thermal noise will decrease...
    on Jan 20, 2012

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