operational amplifiers n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Operational Amplifiers PowerPoint Presentation
Download Presentation
Operational Amplifiers

Loading in 2 Seconds...

play fullscreen
1 / 7

Operational Amplifiers - PowerPoint PPT Presentation


  • 116 Views
  • Uploaded on

Operational Amplifiers. A brief introduction. Op-Amp Introduction. Need exists for a circuit element that can perform: Add, subtract, multiply, divide, differentiate, integrate Evolved from Analog Computers Op-Amp properties

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Operational Amplifiers' - traci


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
operational amplifiers

Operational Amplifiers

A brief introduction

BAE 5413

op amp introduction
Op-Amp Introduction
  • Need exists for a circuit element that can perform:
    • Add, subtract, multiply, divide, differentiate, integrate
  • Evolved from Analog Computers
  • Op-Amp properties
    • Single building block which can be assembled into above functions by adding passive components (R,L,C)
    • Inexpensive (used in high volume)
    • Compact
  • Op-Amp analysis
      • Use assumptions of “Ideal Op-Amp” to allow low frequency performance to be approximated
      • Typically have near ideal characteristics but frequency response of an integrator (G(s) = 1/ts). (Otherwise, the high bandwidth would be impossibly difficult to manage.)

BAE 5413

ideal op amp assumptions
Ideal Op-Amp Assumptions
  • Differential function
      • Vout = A•DV
  • Infinite
      • Intrinsic gain: A = 
      • Input impedance: Zin = 
      • Bandwidth: Vout  f(w)
  • Zero
      • Input offset voltage: Vio= 0 for Vout+ Vio= A•DV
      • Input impedance: Zout = 0

BAE 5413

inverting amplifier
Inverting Amplifier
  • Consider the circuit configuration to the right
  • Assuming intrinsic gain of the op-amp is very large for the frequency of interest:
    • Voutis finite and typically within +15 to -15 V implying DV is very small
  • Assuming ib is very small given the intrinsic input impedance is very large, Vb must be very small

BAE 5413

inverting amplifier1
Inverting Amplifier
  • Amplifier performance is a function of external components only for ideal assumptions
  • Input and output impedances of the amplifier can be calculated as approximately:

BAE 5413

non inverting amplifier1
Non-Inverting Amplifier
  • Input and output impedances can be calculated as approximately:

BAE 5413