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opa355
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  • Forum Post: Re: Designing a simple integrator with THS4211

    Neil Albaugh
    Jim; If you download the latest revision of TINA-TI, version 9, you can open them. Files created with v7 can be read on v9 but not the other way around. Did you notice that VF1 is trying to swing below ground? This is a no-no for a single-supply op amp.
    on Jun 24, 2011

  • Forum Post: Re: Designing a simple integrator with THS4211

    Neil Albaugh
    You're welcome, Jim. It looks like you're circuit is working OK now. Have a good weekend yourself-- tomorrow I can get back to work on my race car.
    on Jun 24, 2011

  • Forum Post: Re: What is the best TIA for my application?

    Neil Albaugh
    Frank; One important parameter is missing-- the capacitance of your source (photodiode?).
    on Nov 1, 2011

  • Forum Post: Re: What is the best TIA for my application?

    Neil Albaugh
    Frank; An OPA355 looks OK to me-- see attached TINA circuit. A single-supply transimpedance amplifier works OK-- and you can use the common-mode bias voltage to reverse bias your photodiode. As you can see in the output Total Noise plot, you should low-pass filter the output so that frequencies above...
    on Nov 2, 2011

  • Forum Post: Re: What is the best TIA for my application?

    Neil Albaugh
    Xavier; Run a noise analysis on your THS4304 circuit and compare it to my OPA355 circuit's noise.
    on Nov 2, 2011

  • Forum Post: Re: What is the best TIA for my application?

    Neil Albaugh
    Xavier; What counts is the total noise in the signal bandwidth refered to the signal voltage at the TZA output. Run an SNR analysis in the Noise section of TINA. With 100nA input, the THS4304 circuit gives a signal voltage of about 50mV and the OPA355 gives 30mV. The total noise is very different...
    on Nov 3, 2011

  • Forum Post: Re: Transimpedance amp with OPA355

    Neil Albaugh
    Thomas; The OPA355 should have enough bandwidth to see a 1MHz signal with no problem. There are ways that you can simplify and improve your circuit, however-- if you use the topology shown in my attached circuit, the photodiode will be reverse biased by 1/2 the supply voltage (I have made the supply...
    on Nov 7, 2011

  • Forum Post: Re: Transimpedance amp with OPA355

    Neil Albaugh
    Frank; For one, the 20k load resistor would not be contributing noise. Second, it is simpler. If you are worried about DC offset caused by background light, then you are not filtering the photodiode adequately. Remember that that background light current is generating shot noise.
    on Nov 8, 2011

  • Forum Post: Re: Transimpedance amplifier using OPA355

    Neil Albaugh
    Thomas; You seem determined to measure the background illumination current, so here is a better way of doing that. It is necessary to provide a negative photodiode bias and there is some additional noise, but this circuit is simple and could employ a dual, OPA2355. I encourage you to use TINA-TI...
    on Nov 10, 2011

  • Forum Post: AC coupling input stage of a transimpedance amplifier?

    Frank QT
    Hi, I am building a system with AC coupling in first stage. I currently build the schematic attached, it doesn't work very well. The current gets divided between the opamp and supply and reduces my overall SNR. If I remove the R5, short C1 and everything works really well but this is not AC...
    on Nov 23, 2011

  • Forum Post: Re: AC coupling input stage of a transimpedance amplifier?

    Neil Albaugh
    Frank; I'm not sure what you mean by "...it doesn't work very well." Your first circuit rolls off the low end frequency response at 1.6kHz but if you increase R5 to 100k it will extend the low end to 16Hz. The second circuit had no return path for the photodiode bias.
    on Nov 23, 2011

  • Forum Post: Re: TIA - Noise reduction

    Neil Albaugh
    Frank; You are probably seeing the effect of gain peaking. When you have gain peaking, the total output noise gets very high. Do an AC transfer function analysis on your circuit in TINA-TI and look at 1kHz to 100MHz. If you have gain peaking, it will be revealed in your simulation. Adjust the feedback...
    on Dec 29, 2011

  • Forum Post: RE: OPA356

    Rachel Coulter
    I have not found any models for the OPA356, however there are models for OPA355, which is the same as OPA356 but with lower VIO and shutdown. The models can be found in the product folder: http://www.ti.com/product/opa355 Rachel
    on Aug 21, 2012

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