Chapter 5 - ) ( 3 3 2 2 1 1 v R R v R R v R R v f f f o +...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5 Operational Amplifier
Background image of page 1

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

View Full DocumentRight Arrow Icon
Introduction A typical op amp: a) pin configuration, b) circuit symbol An op amp is an active circuit element designed to perform mathematical operation of addition, subtraction, multiplication, division, differentiation, and integration.
Background image of page 2
Terminal Voltage and Currents V2 +Vcc -Vcc V1 Vo OPAMP + - OUT A Vo Ro Ri V1 A(V2-V1) V2 Vd=V2-V1 (differencial input) Vo=AVd=A(V2-V1) A: gain (open-loop voltage gain)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Vo Ro Ri V1 A(V2-V1) V2 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 i 1 =0, i 2 =0 i 1 i 2
Background image of page 4
Ideal op amp 1) i1=0 , i2=0 ; 2) V1=V2 V2 V1 Vo OPAMP + - OUT Ideal op amp model i1 i2
Background image of page 5

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

View Full DocumentRight Arrow Icon
Applications Inverting Amplifier i f o v R R v 1 - =
Background image of page 6
Applications Noninverting amplifier i f o v R R v ) 1 ( 1 + = If Rf=0; R1= , then=>
Background image of page 7

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

View Full DocumentRight Arrow Icon
The voltage follower V i V o + - + - First stage Second stage Applications
Background image of page 8
Applications Summing amplifier
Background image of page 9

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

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

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

View Full DocumentRight Arrow Icon
Background image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ) ( 3 3 2 2 1 1 v R R v R R v R R v f f f o + +-= ) ( 3 2 1 3 2 1 v v v v then R R R R if o f + +-= = = = Difference Amplifier 2 2 3 4 1 a b 1 4 2 2 4 3 2 1 1 2 ) / 1 ( ) / 1 ( v R R v R R R R R R v o-+ + = 1 2 4 3 2 1 1 2 1 2 4 3 2 1 ) ( v v v then R R and R R if v v R R v then R R R R if o o-= = =-= = Note: be careful while using nodal analysis, do not set nodal equation at the output terminal. Example: R6 R5 V2 Vi V3 V1 R7 Vo OPAMP +-OUT R4 R3 R8 Find out Vo P.P.5.10 As a voltage follower, v a = v 1 = 2V where v a is the voltage at the right end of the 20 k resistor. As an inverter, v b = Where v b is the voltage at the right end of the 50k resistor. As a summer v = = [6 - 15] = 9V V 5 . 7 v 10 50 2-=- +-b a v 30 60 v 20 60...
View Full Document

This note was uploaded on 04/06/2010 for the course EE 102 taught by Professor Pingli during the Fall '08 term at Shanghai Jiao Tong University.

Page1 / 12

Chapter 5 - ) ( 3 3 2 2 1 1 v R R v R R v R R v f f f o +...

This preview shows document pages 1 - 12. Sign up to view the full document.

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