OPA847文档第11页这句“Adding the common-mode and differential mode input capacitance (1.2 + 2.5)pF to the 1pF diode source capacitance of Figure 3, and targeting a 12kΩ transimpedance gain using the 3900MHz GBP for the OPA847 requires a feedback pole set to 74MHz to get a nominal Butterworth frequency response design. This requires a total feedback capacitance of 0.18pF.”中的74MHZ是怎么算的
