Answered: An op amp has a gain of 100 dB at dc…

An op amp has a gain of 100 dB at dc and a unity-gain frequency of 5 MHz. What is fB? Write the transfer function for the gain of the op amp.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter18: Resistive-inductive Parallel Circuits

Section: Chapter Questions

Problem 13PP: In an R-L parallel circuit, IT=1.25 amps, R=1.2k, and XL=1k. Find IR

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Concept explainers

Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.

Question

An op amp has a gain of 100 dB at dc and a unity-gain frequency of 5 MHz. What is f_B? Write the transfer function for the gain of the op amp.

Expert Solution

Step 1

The actual value of gain (A) is given by:

The relation between unity gain frequency (f_T), gain of the op-amp and f_b is:

Hence, the value of f_b is 50 Hz.

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