Hi Seongjin,

I apologize for causing some confusion. 500fF (or 500f) is 500 femtoFarad capacitor. You should be able to find a small package size capacitor for this value. However, if you are having trouble finding a 500fF capacitor, you can use a T…

Hey, 

Few suggestions based on your requirements: 

1. OPA843 (800 MHz GBW, 8-12V Total supply, 1000 V/us slew)
2. OPA699 (1GHz GBW, 5-12V Total supply, 1400 V/us slew)

You can also look at some integrated analog current sense amplifiers here.

Thanks
Aditya Go…

I wonder if there are any problems when my circuit consists of LMH34400 and OPA657 or with similar products such as OPA843.

I attached my circuit diagram on this post.

Please kindly review my inquiry.

Thanks.

Hi Imon,

When using a balanced photo detector, you are sourcing and sinking current. The LMH32404 Ambient Light Cancellation (ALC) feature only works with photodiodes that sink the photocurrent. And the VOD pin is functional only when the LMH32404 device…

Hi Hasan,

Thank you for your response. Actually, I read THS4021 is good for high frequencies like 1 MHz and requires less settling time. Could you maybe suggest any other IC? I have THS4021,  OPA843, AD8021ARZ, AD8038 in hand available.

Thank you in…

Hello Ratul,

  Thank you for reaching out. We have done similar setup in the lab without a photodiode or AC input current source. The method we use is highlighted below:

  This is from a PowerPoint with more details attached below. Make sure that C1 is…