High Speed Amplifiers

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  • 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: 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: What is the best TIA for my application?

    Frank QT
    This is for a transimpedance amplifier. I have a modulated signal (~1MHz) with 75% duty cycle. (i.e. 750nsec on, 250off). We currently have designed OPA355 and it works well in terms of noise etc. except it is not fast enough. If I increase the gain above 200K, the rise time of the opamp violates...
    on Nov 1, 2011

  • Forum Post: -5V bias with LTC1044/7660 - Switched Capacitor Voltage Converter for a TIA

    Frank QT
    Hi, I like to increase my dynamic range in my circuit and I am about to cut a new board, need advice from gurus. One of the easiest way to increase my dynamic range on my existing system is to bias photodiode with -5V. The PD will not pull any decent current, less than 200uA worst case. I am thinking...
    on Dec 2, 2011

  • Forum Post: TIA - Noise reduction

    Frank QT
    Hi, I have been posting on this forum for a while. I have recently built another amplifier board, spent extra time to make sure it is really clean in terms of layout . When I get the board I was disappointed with the result from the get go but when I play with it, I have noticed the following situation...
    on Dec 28, 2011

  • Forum Post: OPA2355 to ADC: RC filter concern

    Frank QT
    I have built a 4 stage transimpedance amplifier, the first 2 stages are for gain and the last 2 for active filter. My signal is 1MHz with duty cycle of 50%. The active filter blocks anything above 1.5MHz (LP filter). My signal rise time is acceptable and I sample the signal using Maximum likelyhood...
    on Feb 10, 2012

  • Forum Post: Re: OPA657

    Luke Lapointe
    Khaled, What specifically is not working? If you upload your schematic we can take a better look at the problem. There are also a couple app notes that might help you get started: Transimpedance Considerations for High-Speed Operational Amplifiers - sboa122 Compensate Transimpedance Amplifiers...
    on Feb 28, 2012

  • Forum Post: Total Noise

    Frank QT
    Hi, I have built a transimpedance amplifier using OPS355. I am generally happy with the performance but I like to check with the masters here, if the total noise performance is acceptable. According to TINA simulation I should see a worst case noise of 15mV. Please see the attached. However...
    on Feb 15, 2012

  • Forum Post: RE: Need help for Selection of low noise Quad Opamp for Photodiode Transimpedance Amplifier

    Faisal Rehman
    Hi Anand, Thank you very much for your recommendations. According to the specs of opa4277, it seems to be a good option but it comes with dual supply.I am looking for a single supply opamp as I have only dc photocurrents (without any modulation), it would make the things more simpler to use only one...
    on Mar 15, 2013

  • Forum Post: Need help for Selection of low noise Quad Opamp for Photodiode Transimpedance Amplifier

    Faisal Rehman
    Dear TI Employee and members, I am looking to design a Photodiode Transimpedance Amplifier for converting the photocurrents of an ASIC image sensor (4x4 photodiodes) with extremely low currents <1nA and capacitance <1pA . I will be using 20 MOhm or 50 Mohm Transimpedance so the voltage would...
    on Mar 14, 2013

  • Forum Post: OPA355 Circuit - Impact of resistor

    Frank QT
    I have the following circuit It is essentially a AC amplifier. I have a signal that is 500KHz and I am able to amplify even a few nA signals with good accuracy. The problem is the sun. When device is working outdoors, the photodiode (shown as a current source) becomes forward biased. The current...
    on Mar 27, 2013

  • Forum Post: RE: Capatitor noise in Transimpedance Amplifier

    Luke Lapointe
    Zhao, The 3 comes from the integration of F 2 , which results in F 3 /3. I’ve shown the analysis below. To solve for e o , use superposition Combine all the noise sources: Solve for I EQ : Which matches equation 13 in the app note. Additionally, to add to Hooman's post,...
    on Apr 8, 2013

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