OPA2191 datasheet(26/59 Pages) TI

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8.3.5 Capacitive Load and Stability

The OPAx191 features a patented output stage capable of driving large capacitive loads, and in a unity-gain

configuration, directly drives up to 1 nF of pure capacitive load. Increasing the gain enhances the ability of the

amplifier to drive greater capacitive loads; see Figure 8-5. The particular op amp circuit configuration, layout,

gain, and output loading are some of the factors to consider when establishing whether an amplifier will be stable

in operation.

Time (2 Ps/Div)

G = +1 V/V

Figure 8-5. Transient Response with a Purely Capacitive Load of 1 nF

Like many low-power amplifiers, some ringing can occur even with capacitive loads less than 100 pF. In

unity-gain configurations with no or very light dc loads, place an RC snubber circuit at the OPAx191 output

to reduce any possibility of ringing in lightly-loaded applications. Figure 8-6 illustrates the recommended RC

snubber circuit.

Input

Output

619

320 pF

Figure 8-6. RC Snubber Circuit for Lightly-Loaded Applications in Unity Gain

OPA191, OPA2191, OPA4191

SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021

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OPA2191 Datasheet(PDF) 26 Page - Texas Instruments