2 Violating Linear Operating Ranges

Figure 2-1 shows an application circuit that is in the non-inverting amplifier configuration. The circuit is in a gain of $2 \frac{V}{V}$ . All conditions are within the linear operating regions of the OPA1656. Figure 2-2 shows the FFT that corresponds to the output signal shown in Figure 2-1. The harmonics shown in Figure 2-2 are very low and therefore the harmonic distortion is very low.

Violating the linear output voltage swing of any amplifier is one way distortion greatly increases. Figure 2-3 shows an example where the linear output voltage specification of the OPA1656 is being violated. A signal of
7.5 V peak is applied to the input. The circuit is in a gain of $2 \frac{V}{V}$ . The output is limited by the power supply voltage and therefore clipped below 15 V. Figure 2-4 shows the measured FFT of the output signal and demonstrates how distortion greatly increases when the linear operating conditions are not met.