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OPA857: Brickwall filter BW

na na78
Guru 16770 points

Part Number: OPA857

Hi

I want to get brickwall filter BW with 5-kohm transimpedance gain.

I think Brickwall BW is obtained using Fc multiplied by Kn.

Fc : Cutoff frequency

Kn : Brickwall Correction factor

As for 20kohm transimpedance, BWcl = 105MHz and Brickwall BW = 135MHz.

So, 135/105 = 1.28 is obtained as brickwall factor.  

If so, Brickwall BW for 5kohm transimpedance can be calculated like 125MHz x 1.28 = 160MHz. 

Is my understanding correct?

BestRegards