The most critical specification to consider is the response speed, which is typically characterized by the amplifier's bandwidth or slew rate. To achieve a high-fidelity output waveform, it is essential to choose an amplifier with a bandwidth significantly greater than the frequency of your target signal.
As a general guideline:
- For a sine wave, select a model with a bandwidth three to five times higher than the operating frequency.
- For a square wave or a pulse signal, a bandwidth of at least ten times the signal's fundamental frequency is recommended. This is because these waveforms contain numerous high-frequency harmonics that are crucial for preserving their sharp edges and overall shape.