JAJSFT1E August 2011 – April 2018 OPA170 , OPA2170 , OPA4170
PRODUCTION DATA.
The dynamic characteristics of the OPAx170 have been optimized for common operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for example, ROUT equal to 50 Ω) in series with the output. Refer to Figure 39 and Figure 40 illustrate graphs of small-signal overshoot versus capacitive load for several values of ROUT. Also, refer to applications bulletin AB-028, Feedback Plots Define Op Amp AC Performance, for details of analysis techniques and application circuits.
100-mV Output Step | G = 1 |
100-mV Output Step | G = –1 |