embedded systems operational amplifiers
Download
Skip this Video
Download Presentation
Embedded Systems Operational Amplifiers

Loading in 2 Seconds...

play fullscreen
1 / 12

Embedded Systems Operational Amplifiers - PowerPoint PPT Presentation


  • 50 Views
  • Uploaded on

Embedded Systems Operational Amplifiers. OpAmps. …very high gain dc-coupled differential amplifiers with single-ended outputs…. NC. offset null. 24 transistors 11 resistors 1 capacitor amplifier gains ~ 10 5 -10 6. invert. +15V. out. non-invert. offset null. -15V.

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 'Embedded Systems Operational Amplifiers' - azuka


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
opamps

OpAmps

…very high gain dc-coupled differential amplifiers

with single-ended outputs…

NC

offset null

24 transistors

11 resistors

1 capacitor

amplifier gains ~ 105-106

invert

+15V

out

non-invert

offset null

-15V

about $0.60 a piece

opamps1
+15V

V+

output ~ K (V+ - V-)

K ~ 106

V-

OpAmps

a few millivolts difference between

inputs will cause the output to swing

full range

output swings dramatically and via feedback, makes difference between the inputs go to zero

inputs draw no current (10-9A)

-15V

opamps2
stable or unstable?

What does it mean to say the op amp is stable?

OpAmps

V+

Vout= K (V+ - V-)

V-

opamps3
V+

Vout= K (V+ - V-)

V-

What does it mean to say the op amp is stable?

OpAmps

stable or unstable?

opamps negative feedback

OpAmps - Negative Feedback

feedback - comparing the output of a system to the desired output in order to make a signed corrective action

CYBERNETICS

negative feedback - connect the output back to the input in such a way as to cancel some of the input.

  • Harold S. Black - patent application on negative
    • feedback in 1928 was “…treated in the same manner as one for a perpetual motion machine.”
opamps stable inverting amplifier
I1

I2

OpAmps - Stable Inverting Amplifier

assume V+=V-=GND

I1+I2 = 0

note: low input and output impedance, R1+R2

opamps stable non inverting amplifier

OpAmps - Stable Non-Inverting Amplifier

assume V+=V-=GND

large input impedance

Zin ~ 108W

opamps summing amplifier

OpAmps - Summing Amplifier

weighted sum?

digital to analog converter?

ad