I have just read this:
OPEN-LOOP GAIN
Unlike the ideal op amp, a practical op amp has a finite gain. The open-loop dc gain (usually
referred to as AVOL) is the gain of the amplifier without the feedback loop being closed, hence
the name open-loop. For a precision op amp this gain can be vary high, on the order of 160 dB
(100 million) or more.
From the section, I can infer that 160 dB here is power gain. But I just wonder why we often use power gain like this not directly amplitude gain.
Is power easy to measure than amplitude?
OPEN-LOOP GAIN
Unlike the ideal op amp, a practical op amp has a finite gain. The open-loop dc gain (usually
referred to as AVOL) is the gain of the amplifier without the feedback loop being closed, hence
the name open-loop. For a precision op amp this gain can be vary high, on the order of 160 dB
(100 million) or more.
From the section, I can infer that 160 dB here is power gain. But I just wonder why we often use power gain like this not directly amplitude gain.
Is power easy to measure than amplitude?