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Photodiode
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  • Forum Post: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    David Walker
    Does anybody in this forum have experience with Photodiode Amps? I am fairly new to the analog design field. I've designed simple inverting amplifiers and band-pass filters before, but now I must design a Photodiode Amplifier. I have a couple different photodiodes made by Hamamatsu (S9219 and S7686...
    on May 22, 2009

  • Forum Post: Re: Photodiode Amplifier problem

    Vinay Shrivastava
    Hi , Like your case i am also poor in electronics background however having reasonable control in MCU . In my project i need to use photodiode as position sensor by detecting laser light falling on the photodiode . I plan to use ADCs of microcontroller and scan voltages across all photodiodes . One having...
    on Sep 8, 2010

  • Forum Post: Photodiodes (with preamps) saturate in direct sunlight?

    Adam V.
    Good day, Quick question on two of the TI optoelectronic products, OPT101 and OPT301 (both are photodiodes with included preamp). Proposed application: Mount three photodiode/preamp ICs orthogonal to each other. Place outside such that all three photodiodes are lit by incident sunlight. Measure...
    on Nov 15, 2010

  • Forum Post: ACF2101 Switched Integrator

    WILLIAM ARCHAMBEAULT
    Hi All: I am working with a design that uses the IVC102 but I need to add a null offset to the input to zero the detector offset out. The IVC102 does not have an input that I can use on that chip but the ACF2101 show that it has both the + and - input available on the chip but can use it? I noticed...
    on Nov 17, 2010

  • Forum Post: looking for the photodiode preamplifier (the input current of typically 5-50 nA)

    Alex Baikov
    I'm looking for the photodiode preamplifier for a useful frequency range of at least 0-100 kHz with incident light powers of 10 nW. The chosen diode for this application is model FDS100 from Thorlabs. It has a sensitivity of roughly 0.50 A/W at 800 nm, an operating bias voltage...
    on Dec 10, 2010

  • Forum Post: OPA381, datasheet analyse

    Perhirin Steven
    Hi, First, happy new year!! (if it's still the right time) Second, I m currently working with an OPA381. I tried to use TINA_spice but I missing a parameter. On page 7, There is a current source as input of OPA381. How much current does it supply? On page 6, It's the same question about...
    on Jan 17, 2011

  • Forum Post: Re: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    Neil Albaugh
    Andreas; Your application requires very high bandwidth (100MHz to 1GHz) and high sensitivity at the same time-- this puts it out of range of a PIN photodiode. To achieve what you want, requires a detector that provides internal gain, such as an avalanche photodiode (APD) or even a photomultiplier...
    on Apr 24, 2011

  • Forum Post: Re: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    Neil Albaugh
    Grant; Your recommendations are all excellent but one-- that one is a trap that almost everyone falls into when first designing photodiode amplifiers. :...use as large a photodiode as you can but then be careful that the capacitance doesnt become too large to limit the frequency...." That...
    on Apr 25, 2011

  • Forum Post: Re: How can I design a Photodiode Amplifier Circuit optimized for 470nm wavelength?

    Neil Albaugh
    David; The best photodiode for your application depends on your signal level and bandwidth requirements as well as on the wavelength of your optical signal. High speed photodiodes are generally optimized for longer wavelengths while general purpose photodiodes peak at a shorter wavelength, even "blue...
    on Apr 25, 2011

  • Forum Post: Re: Photodiode TIA - Equivalent Input Noise - OPA847

    Neil Albaugh
    Albert; "I am developing a Transimpedance Amplifier based on the OPA847 for very small currents originating from a photodiode...." Please look at the OPA847 input bias current spec; it is about 42 uA maximum! This is going to make a VERY poor transimpedance amplifier for small photocurrents...
    on May 9, 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: LOG114

    Teodor Neagoe
    I am looking for answers and suggestions on TI’s LOG114 (Log Amp). LOG114 provides best results when the input is current (for example: photodiode output). However, for my application, we have to use it with voltage source. We would like to monitor the photodiode’s output (pulse) in two ways...
    on May 17, 2011

  • Forum Post: Good OpAmp choice for TIA in UI panel?

    Tom Schroetter
    Hello TI community! I am looking for a good opamp (single supply) in a transimpedance amplifier application and was hoping to get some recommendations from the experienced engineers here. We are developing a user interface panel that uses lot's of photodiodes to detect infrared light (pulsed...
    on Jun 5, 2011

  • Forum Post: Re: Good OpAmp choice for TIA in UI panel?

    Neil Albaugh
    Tom; Bruce's suggestion is a good one to follow. If, however, you have problems with the multiplexing your photodiodes into a transimpedance amplifier, you might consider using a transimpedance amplifier for each photodiode and placing the multiplexer at the output of the amplifiers. To prevent...
    on Jun 5, 2011

  • Forum Post: Precision Photodiode comparator

    Julien GUY
    Dear, I found a "Precision Photodiode Comparator" application in the LM111 datasheet. Have you got an update of this circuit with ROHS components? Have you got technical notes about this application? Thanks and best regards.
    on Jun 16, 2011

  • Forum Post: Re: AFC2101 Photo-current and Noise

    Matt Hann
    Hi Nicholas, Sorry for the delay on this. Here are some answers to your questions: 1) Yes, the 8.17mV is a combination of charge injection, amplifier offset, and the integration of the input error current (input bias current). The AFC2101 begins its integration almost immediately after the switch...
    on Jul 16, 2011

  • Forum Post: Photodiode - op-amp questions

    Michael Churchill
    I have some questions about selection of a TI op-amp for a photodiode system. Sytem details: Goal is to measure absolute light levels (will calibrate photodiode system with known radiance standard) Hamamatsu S1336 photodiode (0.33 A/W, Id=50pA) Photovoltaic mode (0V bias) Necessary bandwidth...
    on Aug 12, 2011

  • Forum Post: Re: Recommended Buffer or Follower for Photodiode Amplifier Circuit

    Neil Albaugh
    Sean; We also need to know the capacitance of the photodiode and its expected signal current. You will probably need a transimpedance amplifier for your application.
    on Sep 10, 2011

  • Forum Post: Re: Recommended Buffer or Follower for Photodiode Amplifier Circuit

    Neil Albaugh
    Sean; Your requirements are not going to be trivial--- A photodiode with 40 pF @ -10V will be difficult to deal with if you need much sensitivity from your fast photodetector circuit. A much smaller PIN photodiode will be far easier to deal with than one with an active area of 13 sq mm. Is it possible...
    on Sep 12, 2011

  • Forum Post: Re: Recommended Buffer or Follower for Photodiode Amplifier Circuit

    Neil Albaugh
    Sean; No optics, eh? Well, we will "endeavour to persevere" as Chief Dan George said. I have attached a circuit that uses a fast current feedback amplifier in a transimpedance amplifier configuration with your 40pF Thor photodiode. I've placed a 5-pole passive L-C low pass filter...
    on Sep 13, 2011

  • Forum Post: Please recommend an amp for my application

    Inyong Kwon
    Hello. I am a graduate student in U of Michigan. Our research group has made photodetectors by ourselves. It has been very successful. Now, for the next step, we would like to see the current shape from our detector on a oscilloscope. So, we are looking for special amplifiers because the output current...
    on Sep 13, 2011

  • Forum Post: PIN Photodiode - Transimpedance Amplifier and Filter in One Stage

    Alex52381
    Hello All, I was wondering if it was possible to build a PIN photodiode transimpedance amplifier that had a built in peaking filter characteristic (I've also heard this called a peaking equalizer or parametric equalizer). I only need a single frequency so I figured a peaking design might have...
    on Oct 3, 2011

  • Forum Post: opt301 characterization

    Izrael John
    I am using the OPT301 for validating a color sensor design, but i have to characterize the photodiode first with LEDs as source of light and if possible get the same response as the one given on the opt301 datasheet. But while trying to do that i keep on getting inconsistent results. e.g. the response...
    on Oct 11, 2011

  • Forum Post: low noise receiver

    ooi chun
    Hi guys, i am looking for designing a receiver.Here is the question. Design a low noise receiver with bandwidth of 30 MHz and gain of 30 dB. Please include any noise filter where necessary i have no idea on how to design it. can anyone help me with suitable schematic of the circuit.thx... owc
    on Dec 10, 2011

  • Forum Post: Re: Photodiode transimpedance amplifer

    Ali Teke91715
    Hi John, Here is the schematic This the waweform, it is about 20cm between IR emiter and photodiode Here is the problem, it is about 1cm between IR emiter and photodiode Thank you,
    on Dec 19, 2011
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