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OPA847
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: Re: Front end transimpedance amplifier for low capacitance APD

    Xavier Ramus
    Other circuits cna be used to drive photodiode. Some of these circuit are described in the SBOA035 application note " Photodiode monitoring with op amps" http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=sboa035 . The inverting circuit for photodiode is the most...
    on Aug 27, 2009

  • Forum Post: Re: Current feedback amplifier for high speed photodiode

    Jim Karki
    I have not seen a CFB (current feedback) amplifier like the OPA695 used for TIA (transimpedance amplifier) design. The typical compensation scheme where you put a capacitor in the feedback will be a problem for the CFB. The OPA847 is a VFB (voltage feedback) amplifier that works for very fast TIA design...
    on Sep 11, 2009

  • Forum Post: Low Power, High-Speed Op Amp - Application Report SBOA121

    Karen
    " Making the Most of a Low-Power, High-Speed Operational Amplifier " by Xavier Ramus looks at several Texas Instruments low-power, high speed operational amplifiers and describes the trade-offs of balancing low quiescent power with performance.
    on Dec 4, 2009

  • Forum Post: Re: transimpedence amplifier

    valmik patel
    Thank you for your help Xavier The photodiodes we are using have a capacitance of 4.9pF and a dark current of about 2-2.5nA. The maximum output we get from the photodiode is about 350nA. I looked at your suggestions and i think the OPA846 should work well for us. I was thinking about using ADS931...
    on Mar 5, 2010

  • Forum Post: Re: Simulating OPA847 with Mentor DxDesigner(HyperLynx) and/or Agilent ADS

    Nick
    Hello, For the OPA847, the typical problem in going to a non- Pspice environment is the model of this switch: .model _s1 sw roff=1e9 ron=1m vh=3v vt=2v We can remove the disable function by changing the following lines. This should allow for proper operation in ADS and possibly HyperLynx...
    on Mar 22, 2010

  • Forum Post: Simulating OPA847 with Mentor DxDesigner(HyperLynx) and/or Agilent ADS

    Stian
    Hi I'm working on a high speed amplifier design using the OPA847 as a part of my thesis. I'm doing schematics and simulations in Mentor DxDesigner with HyperLynx. However, I have great difficulties getting my simulations correct. It seems that the OPA847 operates "correctly", however...
    on Mar 21, 2010

  • Forum Post: Re: OPA847

    Kristoffer Flores
    Matthew, It is possible that a feedback loop is being created through the common power supply connections of the three OPA847 stages and there is inadequate power supply rejection (PSR) to these high frequency signals. In this cascaded high gain configuration, small signals generated on the power...
    on Oct 21, 2010

  • Forum Post: OPA847

    Matthew Andrews
    I am using the OPA847 in my optical receiver.There are three gain stages in the receiver and they are all using the OPA847. I have one as a transimpedance amplifier, followed by an inverting amplifier followed by a non-inverting amplifier. I can get each stage to work independantly, but when they are...
    on Oct 21, 2010

  • Forum Post: How to eliminate the self-oscillation of OPA847?

    Bob61009
    Dear All, I made an amplification circuit with OPA847 as the amplifier recently. The designed the working-frequency is 76MHZ. The designed Gain of my circuit is G=10. When the input signal is strong, the circuit works perfect. However, when there is no input signal, a self-oscillation of 420MHZ exists...
    on Nov 19, 2010

  • Forum Post: OPA847 output impedance for cascade

    Merlin Cooper68095
    Dear all, I wish to receive a clarification of the paragraph on page 10 of the OPA847 datasheet which states: "If the signal source is actually the low impedance output of another amplifier, RG should be increased to be greater than the minimum value allowed at the output for that...
    on Mar 1, 2011

  • Forum Post: photodiode transimpedance for quick pulse (20ns) with high DC background light

    Pierre-Yves Boulanger
    Hello, I'm building a prototype with a single reverse bias (100V) photodiode (photoconductive mode) with a capacitance of 15pF. I'd like to measure the amplitude (by sampling at around 100Mhz with 10bit ADC) laser pulse of 20ns of length with a quite high DC level (might be up to several mA...
    on Jun 20, 2011

  • Forum Post: How to achieve 150M or 200M bandwidth with OPA847?

    Bob61009
    Dear All, I am developing a homodyne detector (HD) based on the OPA847 for very small signal originating from the difference current of two photodiodes (Hamamatsu S3883, 300MHz frequency response). The circuit design is shown below. The frequency of the laser signal I need to detect is 76MHZ. To detect...
    on Sep 2, 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: Transimpedance Photodiode Amplifier Design w/ OPA847

    Luke Lapointe
    Hello Andrew, Yes, breadboards contain a lot of parasitic capacitance which will cause the amplifier to become unstable and oscillate. Your best bet is to build PCB with your circuit in place and solder the OPA847 to the board. There are companies like PCB Express that offer free software tools for...
    on Aug 28, 2012

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