EE302-5-Operational Amplifiers

EE302-5-Operational Amplifiers - The Oper ati onal Ampl i...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 The Operational Amplifier
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 The Operational Amplifier In this lecture, you will learn: The characteristics of an ideal operational amplifier The application of the operational amplifier to five circuit configurations: The comparator The inverting amplifier The non-inverting amplifier The summing amplifier The difference amplifier
Background image of page 2
3 The Operational Amplfier The term is rooted in the days of the analog computer A unit used to perform addition, subtraction, multiplication, division, differentiation or integration Today, the term “op amp” usually refers to a highly integrated circuit capable of performing these same operations by adding external components
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 The 741 Op Amp One of the first solid-state integrated op-amps (1966) Still widely used today Inverting input Non-inverting input Output V + V - 2 3 7 4 6 1 5 Offset null - + - + Inverting input 2 Non-inverting input 3 V - 4 Offset null 1 7 V + 6 Output 5 Offset Null 8 NC
Background image of page 4
5 The 741 Op-Amp You get all of this for around 20 cents. Inverting input Non-inverting input Output V + V - 2 3 7 4 6 1 5 Offset null - +
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 Output Input Characteristics Output-Input Characteristics -20 -15 -10 -5 0 5 10 15 20 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 Input Voltage vd in mV Output Voltage vo in V Positive Saturation Region Negative Saturation Region Linear Region + - + v 1 - + v 2 - - v d + + v o -
Background image of page 6
7 The Ideal Operational Amplifier We will make some assumptions about the op amp characteristics that simplify circuit analysis. For many circuits, these simplifications are justified. The ideal operational amplifier can be characterized as follows: Infinite open loop gain, A 2245 Infinite input resistance, R i 2245 Zero output resistance, R o 2245 0 v o R i Av d R o - + - v d +
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
8 Real World (Non-ideal) Op Amp All real op amps have: A finite input resistance R i A finite (but very large) gain called the open- loop gain (A) A non-zero output resistance R o Current drive limitations Power dissipation Input offsets that must be dealt with in some circuits v o R i Av d R o - + - v d +
Background image of page 8
9 Real vs. Ideal Specs.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 35

EE302-5-Operational Amplifiers - The Oper ati onal Ampl i...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online