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LMH32401: Transimpedance Amplifier

Mark Philip Felipe
Genius 9705 points
Part Number: LMH32401
Other Parts Discussed in Thread: LMH34400, OPA858-Q1

Hi Team, seeking for a suggestion

looking for transimpedance amplifier with a high bandwidth to receive and amplify signals comprising frequencies between 1 kHz and 20 MHz obtained by a photodiode (C = 1 pF). Gain and phase should not be changed between these frequencies. Maximum gain is expected to 20000 (Rf = 20 kOhm).

For this purpose, I found the TIA LMH32401 with a high 3dB bandwidth. However, the transfer behavior of the gain with regard to the frequency is only characterized for frequencies between 10 MHz and 1GHz. My questions:

1. How does the gain looks like for frequencies below 10 MHz until 1 kHz?

2. How does the phase looks like, for the same frequency range?

3. How is it in the case of the TIAs LMH34400 and OPA858-Q1?

Thank you.

-Mark

  • 0
    TI__Mastermind 24095 points

    Hello Mark,

      Thank you for providing the necessary ranges. I am looking into if we have data available for the first two questions for LMH32401 and LMH34400. For the third question, the OPA858-Q1 would be overkill in terms of GBW as calculated below: 

      (Cin includes photodiode capacitance and internal amplifier input capacitance)

    Best Regards,
    Sima