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OPA657
Related Posts

  • Forum Post: Re: Front end transimpedance amplifier for low capacitance APD

    Xavier Ramus
    You are correct, small signal bandwidth is important to maintain the fidelity of the pulse. I attached 2 TINA-TI simulation file. (The software can be downloaded at http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html .) The first file contains the OPA657 model. It seems that I cannot exceed...
    on Aug 25, 2009

  • Forum Post: Re: Front end transimpedance amplifier for low capacitance APD

    Xavier Ramus
    I was thinking at a minimum RC filter. LC filter should be fine and provide a lower brickwall equivalent bandwidth filter. If stability becomes an issue due to the load seen by the amplifier, the SBAA108 application note may be of some help See link: http://focus.ti.com/general/docs/litabsmultiplefilelist...
    on Aug 25, 2009

  • Forum Post: transimpedence amplifier

    valmik patel
    I am new to the field of analog design. I am working on a project in which we are designing a data acquisition system for an array of 4x4 photodiodes. Initially we plan to use individual photodiodes from OSI optoelectronics(HR040) to test the concept. I was thinking about using OPA656 as a transimpedence...
    on Mar 2, 2010

  • Forum Post: OPA657 spice macro model behavior

    Gaston Arrigo
    Hello, I need some help with the behavior of the spice model for OPA657 opamp. I'm simulating a transimpedance amplifier with the OPA657 but I found a diference in the behavior depending on which revision I use. I tested with the following two macro models (I transcribe only Headers of ...
    on Sep 10, 2010

  • Forum Post: Re: A problem in implementing OPA657

    Kristoffer Flores
    Hi, Can you please attach a schematic of the OPA657 circuit you are using and an oscilloscope capture with the noise you are seeing? Are you seeing this noise with no input signals? The OPA657 could be oscillating - the minimum recommended gain is +7V/V.
    on Feb 28, 2011

  • Forum Post: Re: opa657 transimpedance mode

    Kristoffer Flores
    Hi Sama, I have some questions/requests about your circuit: What is the photodiode capacitance? A 50ns pulse can be taken as a 100ns period square wave which would have a fundamental frequency of 10MHz. If the photodiode capacitance is around 5pF (and adding the input pin capacitance of around...
    on Mar 30, 2011

  • Forum Post: Re: APD transimpedance amplifier

    Neil Albaugh
    Joel; I've attached a circuit for a transimpedance amplifier with an OPA657 and another but similar APD. The laser pulse should be short and have a fast rise time so you can get good range resolution and keep thr duty cycle of the laser low. If you know the shape of your laser pulse (a short laser...
    on May 15, 2011

  • Forum Post: Re: OPA 657 as transimpedance

    Neil Albaugh
    Jim; Is there some reason that the OPA847 input capacitance is not included in the OPA847 model? If the customer's requirement is for 100 megabits per second, he will need only 50MHz BW if it is an NRZ code.
    on Jan 7, 2012

  • Forum Post: Re: I have problem when using OPA657 as a transimpedance amplifer, please help me.

    Neil Albaugh
    Guangjun; I think your problem is probably that you are using that circuit on a single supply. Try using +/-5V.
    on Jan 13, 2012

  • Forum Post: Re: I have problem when using OPA657 as a transimpedance amplifer, please help me.

    Neil Albaugh
    Guangjun; The feedback resistor & capacitor should connect to the output pin, pin 6, not pin7, the +5V supply pin. Unless your photodiode has very high capacitance, I think you will find that your circuit will oscillate. Try simulating it with TINA-TI.
    on Jan 13, 2012

  • Forum Post: Re: OPA657 problem_power supply

    Luke Lapointe
    Gao, From the description it is hard to tell exactly what the problem is. There are a number of things that could be going on here. If the feedback capacitor is off or the gain is too large, you could be saturating against the rail. When we typically design a TIA, we use something similar to the attached...
    on Jan 16, 2012

  • Forum Post: Re: OPA657_with_Photodiode

    Luke Lapointe
    Hello Wilson, The formula for compensating the amplifier can be derived from the equation on page 11 of the datasheet. 1/(2π* R F * C F )= sqrt( GBP /(4π* R F C D )) Using the following conditions given in the datasheet, R F =200kΩ,C D = 5.2pF + 70pF, GBP=1600MHz Solve for C F...
    on Feb 9, 2012

  • Forum Post: OPA657 Photodiode Transconductance Amplifier problem

    Muhammad Talha
    Hello All, I am trying to simulate a circuit but somehow i am not getting the response that is supposed to come out. I am attaching the circuit file herewith. The frequency response of the circuit should be like this. Instead I am getting a flat line. I am new to high speed...
    on Mar 19, 2012

  • Forum Post: RE: OPA657 spice model error

    Luke Lapointe
    Hello Josh, 100pF is very large for a compensation capacitor in the feedback path which could be a source of oscillation. Typical values are around 1pF or less. The applications section starting on page 11 of the OPA657 shows how to calculate the correct value for the compensation cap. A similar...
    on Jul 9, 2012

  • Forum Post: RE: LHM6554LE configuration

    Niklas Roschewsky
    Hi Hooman, Thank you very much for your help. I will try to use the OPA657 amplifier for the reasons you mentioned above. Also the evaluation board http://www.ti.com/tool/dem-opa-sot-1a looks suitable, since it can be used to build a differential input/single output amplifier. Attached I put a plan...
    on Mar 25, 2013

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