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High speed IV conversion transimpedance amplier

Vivek Gujari
Prodigy 185 points
Other Parts Discussed in Thread: TINA-TI

Hi,

My name is Vivek. I am looking for a transimpedance amplier for a specific application.

I want to convert the current ranging from 0A -.25mA to less than +-15V. Maximum frequency of 125 MHz. Please suggest a Transimpedance amplifier for this application.

  • 0
    TI__Genius 12631 points

    Vivek,

      You will not find an amplifier capable of doing this in a single stage. Your required specification calls for an amplifier with a bandwidth of greater than 10 GHz. Please read these documents to get a better idea on how I came up with these numbers:

    What you need to know about transimpedance amplifiers – part 1
    Other Parts Discussed in Post: TINA-TI Transimpedance amplifiers (TIAs) act as front-end amplifiers for optical sensors such as photodiodes, converting the sensor’s output current to a voltage. TIAs are…
    By in Technical articles > Analog

    In order to accurately determine the amplifier bandwidth needed for your application, you need to provide the capacitance of your photodiode. Do you know what that is?

    I am also curious about your +/-15V requirements. What stage follows the transimpedance amplifier stage? Is it an ADC? There are no ADCs that work on +/-15V supplies. Furthermore photodiodes only provide a unidirectional output current depending on the bias orientation of the photodiode. Is there a reason you need split supplies?

    What is the end application that you are working on?

    -Samir