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  • OPA637:OPA637 + dual-JFET bootstrap TIA: higher noise in hardware vs. SPICE – help with polarity dependence and JFET-bias resistor sizing

    Resolved
    Other Parts Discussed in Thread: OPA637 Hi, I’m prototyping a photodiode trans-impedance amplifier that places a dual-JFET bootstrap in front of an OPA637. The idea is to “hide” most of the photodiode capacitance (≈ 4 nF) so I can keep RF=10M while…
    • Resolved

  • OPA637: the function of the feedback loop in parallel capacitor

    TI Thinks Resolved
    Part Number: OPA637 Hi, the OPA637 gives the following application circuit, I don't quite understand what is the role of the 3pF capacitor, is it to play the role of phase compensation, how is its value calculated, and how to consider the stability of…

  • OPA637: Transimpedance amplifier

    Part Number: OPA637 Other Parts Discussed in Thread: OPA627 Attached below is the actual board design wth OPA637 with photodiodes For testing purpose, I have removed photodiode from the practical circuit. I have taken jumper wires from the solder pads…

  • OPA637: Circuit understanding Required

    TI Thinks Resolved
    Part Number: OPA637 Other Parts Discussed in Thread: OPA404 , OPA627 Hi Team, We have used OPA637, OPA627 and OPA404 in one of our circuit. Input is from Si PIN photodiode S2506-02. Attached Snippet of the circuit. Can anyone explain in detail to…
    • Answered

  • RE: OPA637: OPA637 distortion problem

    Resolved
    Hi Michael， OPA637 has a 20MHz carrier when it is static. Is this causing noise when it is used as an LPF and requires a stable gain of ≥5? Thank you!

  • OPA637: Unwanted oscillations in a Transimpedance Amplifier (TIA) using a OPA637

    TI Thinks Resolved
    Part Number: OPA637 Hi I am using an OPA 637 in transimpedence amplifier configuration. According to the datasheet, this opamp is stable for gain>5. I am using a feedback resistor of 300K. The photodiode capacitance Ci is 10pF. However, I am getting…
    • Answered

  • OPA637: Gain Bandwidth Product

    Resolved
    Part Number: OPA637 Other Parts Discussed in Thread: OPA627 Hi Team, Customer is asking why GBP (80MHz) of OPA637 list in the datasheet does not correlate with our graphs? The best I can tell is just about 60MHz. How to read GBP from the graph then…
    • Resolved

  • RE: Unwanted oscillations in a Transimpedance Amplifier (TIA) using a OPA637

    Adrian, I suspect that the combination of your feedback cap and photo diode cap is causing this problem along with the minimum allowable closed loop gain of your amplifier. The circuit stability can quickly be determined by comparing the value of…
    • Answered

  • OPA637 TINA-TI Noise Analysis

    Resolved
    Other Parts Discussed in Thread: OPA637 , TINA-TI Hello, Here is a post from another forum related to the OPA637, noise analysis using TINA-TI, and the effect of low frequency Noise Analysis on SNR, for reference: http://e2e.ti.com/support/development_tools…
    • Resolved

  • RE: Current noise of the OPA637 op-amp

    Lyman, It it very helpful to include with your question a schematic of your application so there is no ambiguities about it. Placing 10Mohm resistor at the input of your circuit adds 400nV/rt-Hz thermal noise, R_noise=(4*K*T*R)^0.5 = (4*1.38E-23*300…
    • OPA637 application.TSC

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