Question

explain why the voltage gain of an amplifier cannot be increased beyond a limit by increasing load resistance​

Answer 1

In a generic sense, the bandwidth of an amplifier is ultimately limited by the capacitance and driving resistances in the system. The exact mechanism will vary depending upon the type of amplifier. That is, an open-loop amplifier is more likely limited by output resistance and capacitance, but a closed-loop amplifier is limited in many cases by the ‘compensation’ capacitance and the input gm (transconductance). The slew rate limitation is not really the ‘generic’ answer. Slew rate limit is usually a large signal effect. Increased frequency will make the slew rate limit appear more rapidly, but the bandwidth is normally specified as an AC parameter (small signal). Sometimes, amplifiers will specify a ‘full power’ bandwidth which also accounts for slow rate.

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