3 ms·
CA3140 OpAmps also work well. The comments about 1pF feedback do speak to one of the challenges with feedback stability, where stray capacitance on the proto-b
by kurthr 6y ago
CA3140 OpAmps also work well.
The comments about 1pF feedback do speak to one of the challenges with feedback stability, where stray capacitance on the proto-board may or may not be present.
- analog31 6y agoIndeed, a 100-Meg feedback resistor is mostly a capacitor. You could think of it as an integrator with DC bias control. This is probably the best article I've seen about transimpedance amplifiers: https://electrooptical.net/static/oldsite/www/frontends/frontends.pdf https://electrooptical.net/static/oldsite/www/frontends/fron...
- jacquesm 6y agoYou could draw a pretty interesting graph of how the resistance/parasitic capacitance relationship governs which component is dominant at the high end of the resistance range.