This course introduces students to the basic components of electronics: diodes, transistors, and op amps. It covers the basic operation and some common applications.

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From the course by Georgia Institute of Technology

Introduction to Electronics

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This course introduces students to the basic components of electronics: diodes, transistors, and op amps. It covers the basic operation and some common applications.

From the lesson

Introduction and Review

Learning Objectives: 1. Review syllabus and procedures of this course. 2. Review concepts from linear circuit theory to aid in understanding material covered in this course.

- Dr. Bonnie H. FerriProfessor

Electrical and Computer Engineering - Dr. Robert Allen Robinson, Jr.Academic Professional

School of Electrical and Computer Engineering

Welcome back to electronics.

Â This is Dr. Ferri.

Â In this lesson, we will do a review of transfer functions.

Â In our previous lesson, we did a preview of impedances.

Â Now, impedances is a basic

Â type of component that we're going to need when we do transfer functions.

Â So in this lesson, we will review transfer functions and

Â we show how they are used to characterize a circuit.

Â And this will be leading into our next lesson

Â which will be to look at frequency response curves.

Â Let's define a transfer function in terms of two-port networks.

Â By two-port networks, that means I've got an input and an output.

Â So my input is a voltage here and my output is a voltage there.

Â And in this case I'm looking at the input to be a sinusoidal input.

Â And I'm looking at the output in steady state, and it's also sinusoidal.

Â And notice that it's at the same frequency, but

Â it has a different amplitude and a different phase.

Â For shorthand notation, we draw what we call, or define what we call a phaser,

Â which is just a shorthand notation to show the input amplitude,

Â or we can call it the magnitude, and the angle.

Â And the output phaser is the output amplitude and

Â the corresponding phase.

Â And the transfer function just shows what happens in the circuit.

Â So, how does the circuit handle the input to give you that output?

Â And we define the transfer function as being whatever impedance function that

Â we have.

Â In our last lesson, we showed impedance functions that, when we came up with some

Â sort of function of omega, multiplying by my input to give me my output.

Â That's what we did when we did circuit analysis in our last lesson.

Â And what we're saying here is whatever multiplied by

Â that input to give me the output That's the transfer function.

Â So in terms of phasers, I just substitute in for

Â the phaser here, this whole thing is a phaser.

Â And over here, the output, everything here is the phaser form of the output.

Â Now if I do that, I can take the magnitude of both sides,

Â and the angle of both sides.

Â So, if I take the magnitude of both sides of this.

Â I would get the magnitude of H times

Â A is equal to, that's A in is equal to A out.

Â So, I've just written it this way in terms of a function

Â A out is equals to something.

Â I'm trying to solve for A out.

Â The output amplitude and that equal to the input amplitude times the magnitude

Â that transfers function at that frequency omega.

Â So it's important this is a given omega so at that frequency omega.

Â And the phase angle right here on the output is equal to the angle of H,

Â plus at that same frequency, plus the angle of the input.

Â And that was gotten just by taking the angle of both sides,

Â that's angle of H plus the angle of theta is equal to the angle of the output.

Â Summary of Simple Circuits.

Â We analyzed two of these circuits in our last lesson on impedances.

Â And so the two circuits that we looked at was this one right here and

Â this one right here.

Â And what we had was our output what we solved using voltage divider laws.

Â Our output was equal to 1 over 1+RC j omega times V in.

Â And we define the transfer function as anything

Â that multiplies my input to give me my output.

Â So that's how we came up with this transfer function.

Â And if instead I took the voltage across a resistor rather than

Â the capacitor I can do the same sort of analysis and get this transfer function.

Â And in the last lesson we actually did solve this transfer function right here.

Â So there is a summary of simple circuits and their transfer functions.

Â So in summary, we defined a transfer function for two-port networks and

Â we showed some simple transfer functions of simple circuits.

Â In our next lesson we will use the transfer function

Â representation to show how to come up with frequency responses.

Â Thank you.

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