• Optimizing Overshoot: The OPA814 features an internal slew-boost circuit to deliver fast rise-time in

applications that require high slew rates, such as when configured as a transimpedance amplifier. For

applications where overshoot must be limited, limit the input slew rates by introducing a series resistance

(RS); see also Figure 9-4. Resistor RS forms a low-pass filter with an input capacitance of approximately 2.5

pF at the noninverting pin of the OPA814, thus limiting the input slew rate to the amplifier. Figure 9-5 shows

how limiting the input slew rate to the amplifier results in good overshoot performance. Figure 9-6 shows how

this configuration achieves a small-signal and large-signal bandwidth of 180 MHz.

9.2.1.3 Application Curves

Figure 9-5. Step Response of Digitizer Front-End

Frequency (Hz)

-18

-15

-12

-9

-6

-3

0

3

100k

1M

10M

100M

1G

VOUT = 100 mVPP

VOUT = 1 VPP

Figure 9-6. Frequency Response for RS = 250 Ω

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OPA814

SBOSA14 – APRIL 2023

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