Hi!

Is Eq. 12 for min GBP with a Butterworth response correct in sboa122.pdf?

Example, required:

Transimpedance is 1800 V/A, Frequency at -3 dB is 200k, Cin = 10 pF.

Compute the circuit values:

The feedback resistor is 1800 Ohm, the feedback capacitor is 430 pF.

According eq. 12:

GBP = 2 * pi * 200 kHz^2 * 1800 * 10 pF = 4500 Hz