OPA445 is a high-voltage field-effect transistor input operational amplifier 3

Capacitive load

The dynamic characteristics of OPA445 have been optimized for common gain, diode load, and operating conditions. The combination of low closed-loop gain and capacitive load can reduce phase margin and may lead to gain peaks or oscillations. Figure 3 shows a circuit that maintains phase margin under capacitive load. The circuit will not experience voltage drop due to load current; However, the input impedance will decrease at high frequencies. The reference application announcement SBOA015 can be downloaded from the www.ti.com website, which provides a detailed introduction to analysis techniques and application circuits.diode