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