Linear Circuits 1 - 21 - Operational Amplifiers, Part 1

Name: Linear Circuits 1 - 21 - Operational Amplifiers, Part 1
Rating: 4.5 (110 reviews)

How to Use the Three Laws of Ideal Operational Amplifiers to Solve Any Op Amp Circuit

Created byMark Budnik, Mark M. Budnik

Last updated 9/2020

English

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What you'll learn

What are the three laws of ideal operational amplifiers?
How can you use the three laws of ideal operation amplifiers to solve a circuit?

Course content

1 section • 12 lectures • 36m total length

Agenda0:13
A Word on Linear Circuits Textbooks....0:19
Review4:08
Introduce the operational amplifier and its three governing laws, and review Ohm's law and power concepts. Explore nodal analysis, linearity and superposition, and source transformations to simplify circuits.
What Are Operational Amplifiers (Op Amps), and What Do They Do?3:48
Explore operational amplifiers, built from transistors, that acquire small input signals, clean noise, and drive outputs by multiplying voltages for sensors and audio amplifiers.
What are the Inputs and Outputs of Every Op Amp?5:28
Explore the op amp's five pins, including power, non-inverting and inverting inputs, and the output, and how their connections shape the input–output behavior.
The Three Laws of Ideal Op Amps2:33
Explore the three ideal op amp laws: the input voltages are equal, input currents are zero, and the output adjusts to enforce these conditions for analysis of op amp circuits.
First Example5:45
Identify voltages, apply the three ideal op-amp rules, and determine currents through the resistors, showing the output voltage adjusts to keep the op-amp inputs equal.
Second Example3:03
Analyze an ideal op-amp circuit with a 60 mV input, equal input voltages, and currents through 3.3 kΩ and 220 kΩ resistors to determine a 4.33 V output.
Third Example (General Non-Inverting Amplifier)5:02
Explore the general non-inverting op-amp circuit, applying Ohm's and Kirchhoff's laws to derive Vout = Vin(1 + R2/R1) under ideal op-amp assumptions.
Fourth Example (General Inverting Amplifier)3:40
Rearrange resistors to form an inverting op amp configuration, applying ideal op amp laws to show equal inputs and zero input current, yielding a negative output around minus one volt.
Should I Memorize All These Equations?1:27
Compare non-inverting and inverting op-amp configurations, showing how input voltages scale to output with resistor ratios, and emphasize that you don’t need to memorize equations for exams.
Summary1:33
Explore how ideal op-amps rely on three laws—equal input voltages, zero input currents, and output adjusting to satisfy the first two—to analyze any op-amp circuit.

Requirements

High School or College Physics
We Also Recommend Our Previous Linear Circuits Classes

Description

Day 21 of Linear Circuits. Operational amplifiers are some of the most essential building blocks of electric circuits. While the circuits themselves can be imposing, we show you three basic laws that hold true for all ideal op amps that allow you to quickly simplify and solve op amp circuits.

The material covers all of the lecture material from an twenty-first lecture in a traditional, sophomore-level linear circuits class.

Who this course is for:

Beginner Engineering and Physics Students