1 / 12

Chapter 5

Chapter 5. Operational Amplifier. Introduction. An op amp is an active circuit element designed to perform mathematical operation of addition, subtraction, multiplication, division, differentiation, and integration. A typical op amp: a) pin configuration, b) circuit symbol.

rane
Download Presentation

Chapter 5

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 5 Operational Amplifier

  2. Introduction An op amp is an active circuit element designed to perform mathematical operation of addition, subtraction, multiplication, division, differentiation, and integration. A typical op amp: a) pin configuration, b) circuit symbol

  3. Terminal Voltage and Currents Vd=V2-V1 (differencial input) Vo=AVd=A(V2-V1) A: gain (open-loop voltage gain)

  4. i1 i2 Actual op amp: Ri(very large); Ro(very small); A(very large) Idealization: Ri=> ; Ro=>0 ; A=>  As Vo is limited, we can get from Vo=A(V2-V1) that: V2=V1 As Ri=> , we can get i1=0, i2=0

  5. i1 i2 Ideal op amp model Ideal op amp • i1=0 , i2=0 ; • V1=V2

  6. Applications Inverting Amplifier

  7. Applications Noninverting amplifier If Rf=0; R1=, then=>

  8. + + First stage Second stage Vi Vo The voltage follower - - Applications

  9. Applications Summing amplifier

  10. 2 a 3 b 3 1 1 2 4 Difference Amplifier Note: be careful while using nodal analysis, do not set nodal equation at the output terminal.

  11. Example: Find out Vo

  12. P.P.5.10 As a voltage follower, va = v1 = 2V where va is the voltage at the right end of the 20 k resistor. As an inverter, vb = Where vb is the voltage at the right end of the 50k resistor. As a summer v0 = = [6 - 15] = 9V

More Related