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Original question:

OPA381: opa381

OPA1604: How to design Circuit ?(input signal 300Khz and Gain is 600)

Eggsy Pang
Expert 4985 points
Part Number: OPA1604
Other Parts Discussed in Thread: INA826, INA166, INA128, INA188

Hi team,

My customer need design Circuit and the input signal max frequency is 300Khz and Gain need 600. The input signal is two pair Differential signal.

I plan to use OPA1604. Every two amps of OPA1604 use to amplify one pair Differential signal.

in every two amps of OPA1604, one amps amplify 25 and another amps amplify 24.(25*24=600)

Do you have another good suggestions?

Thanks!

  • 0
    TI__Guru 56451 points

    Hi Eggsy,

    I would recommend to have two stage amplification for the the application, sine BW is up to 300kHz and Gain =600. 

    1. Connect the differential input signal to INA128, INA826, INA188, INA166 etc. instrumentation amplifier, say set the gain between 10-100 range (check the BW).

    2. Amplify the remaining signal with another precision op amp. to obtain the total gain of 600.

    What types of design application is this? 

    Best,

    Raymond