6.3.5 Full-Power Bandwidth Improved

The full-power bandwidth curve has been a staple in datasheets for decades. The full-power bandwidth of an op

amp provides some indication about where designers can expect slew-induced distortion on a signal of a given

amplitude and frequency. The full-power bandwidth curve is generated using Equation 3.

FPBW= SR

2πVOUT_MAX

(3)

Figure 6-5 shows the full-power bandwidth of the OPAx591. The curve is a good reference for designers

that need to achieve high-voltage, high-frequency output swings with little concern for distortion performance.

Unfortunately, the curve provides little indication of the true distortion at any given point on the curve. The

full-power bandwidth curve is, after all, only a theoretical value and slew-induced distortion appears gradually

as the output nears the maximum rate of change. Furthermore, slew-induced distortion is only one of several

sources of op-amp distortion. Therefore, the curve is a decent starting point, but not a reliable source for

distortion performance.

Figure 6-6 shows the full power bandwidth in terms of total harmonic distortion (THD) performance for the

OPAx591. This curve provides a better indication of the level of distortion that a designer can expect for a signal

of a given amplitude and frequency. For example, the OPAx591 can achieve approximately −100dB or better

of THD at 70VPP up to approximately 1kHz. As a second example, the OPAx591 can achieve approximately

−130dB or better of THD at 10VPP up to about 1kHz. As a result of limitations in measurement bandwidth, only

20kHz data are recorded.

Frequency (Hz)

0

10

20

30

40

50

60

70

80

90

100

110

120

1

10

100

1k

10k

100k

1M

10M

85V

8V

Figure 6-5. Full-Power Bandwidth

Figure 6-6. Full-Power Bandwidth Improved

6.3.6 Overload Recovery

Overload recovery is defined as the time required for the op amp output to recover from a saturated state to

a linear state. The output devices of the op amp enter a saturation region when the output voltage exceeds

the rated operating voltage, either due to the high input voltage or the high gain. After the device enters the

saturation region, the charge carriers in the output devices require time to return back to the linear state. After

the charge carriers return back to the linear state, the device begins to slew at the specified slew rate. Thus, the

propagation delay in case of an overload condition is the sum of the overload recovery time and the slew time.

6.4 Device Functional Modes

The OPAx591 has a single functional mode and is operational when the power-supply voltage is between 8V

(±4V) and 85V (±42.5V).

OPA591, OPA2591

SBOSA47A – FEBRUARY 2026 – REVISED SEPTEMBER 2026

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