This diagram explains how an operational amplifier’s (Op-Amp) gain changes as frequency increases. At low frequencies, the amplifier has very high gain, but as frequency rises, the gain gradually decreases at a rate of approximately −20 dB per decade. The graph also highlights important concepts such as the −3 dB cutoff point, unity gain frequency, differential input voltage, input/output impedance, and the internal open-loop model of the amplifier.
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