Chapter 14, Problem 14.5EP

An op−amp with open−loop parameters of $A_{OL}=2\times {10}^5$ and $f_{PD}=5\text{Hz}$ is connected in a noninverting amplifier configuration with a low−frequency closed−loop gain of $A_{CLO}=30$ . An input voltage signal of ${\upsilon }_I=100\sin \left(2\pi ft\right)\mu \text{V}$ is applied. (a) What is the closed−loop bandwidth?(b) What is the low−frequency output voltage? (c) Determine the peak amplitude ofthe output voltage if the frequency of the signal is (i) $f=5\text{kHz}$ , (ii) $f=50\text{kHz}$ ,and (iii) $f=200\text{kHz}$ . (Ans. (a) $f_{3-\text{dB}}=33.3\text{kHz}$ ; (b) ${\upsilon }_O=3\sin \left(2\pi ft\right)\text{mV}$ ; (c) (i) $\cong 3\text{V}$ , (ii) 1.663 mV, (iii) 0.493 mV)