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transimpedance amplifier

Deblina Sarkar
Prodigy 10 points
Other Parts Discussed in Thread: LMP7721, LMC6001

Do you have any transimpedance amplifier that can amplify picoamperes or lower current ?

  • 0
    TI__Guru* 93105 points

    Hi Deblina,

    To measure picoamperes, or lower of current, with a transimpedance amplifier the op amp used will have to even lower input bias current. TI has a number of precision operational amplifiers that have extremely low input bias current. They have low voltage offset, low noise and wide bandwidth as well. Take a look at the datasheets for the LMP7721, LMC6001 and OPA129 for starters.

    Note that when working with extremely low input current circuits PC board contamination (cleanliness) and leakage across the transimpedance gain set resistor can cause big errors. Its not anything that cannot be dealt with without taking them into consideration and planning accordingly up front.

    Regards, Thomas

    Precision Amplifiers Applications Engineering