Lecture 10: Operational Amplifier

1
Lecture 10 Operational Amplifier

• Jeong Wan Lee
• ?????? ? ??

2
Amplifier

• ???? ????? ???? ?
• Ideal Amp.
• i) source? ? Amp ????
• ii) load? ? Amp ?? source

Amp. Gain, A
VL
RS
VS
-
RL
-
load
source
i)
ii)
3
Op Amp? ????
RS
ROUT


VS
-
VIN
RIN
RL
VL
AVIN
-
-
-
Amp
4
Op Amp ??? ??? ??
ROUT
IIN
Non inverting
V

RIN
VIN
AVIN
-
AV(OL)VIN
-
V-
inverting
AV voltage gain (OL) op amp? ???? ???? ?? ?,
-
5
Inverting Amplifier
RF
RS
IIN
V-
IS
IF
-

V
VS
-
VOUT
-

• At Node V-
• ??? ?? ?? ??

6
Cont...

• ??,
• Closed loop gain? ?? ???.

Inverting amplifier
7
Cont...

• ?? ???,
• Op Amp? 99 ?? negative feedback? ????. (V-???
  feedback)
• ??? ?? noise? ??? ???? ??
• Op Amp ??? ??? ??

Negative feedback????
8
Non-inverting Amplifier
RF
R1
IIN
IS
IF
-

VS
VOUT
-
R2
IOUT
-

• Op Amp? ????,
• node??? ??

9
Cont...

• ??? ??? ??

R2? ?? ??? ??
negative feedback
Closed loop gain (?? ) non-inverting amp
10
Differential Amplifier
RF R2
I2
R1
I1
-

VOUT
-
R1
V1
-
V2
-
R2

• node??? ??

11
Cont...

• ???,
• ??,

Closed loop gain (?? ) differential amp
(noise ??? ??)
12
Cont...

• White Noise
• noise? ??? ???? ??? noise
• ???? ???? ??? ??
• Differential Amp? noise??
• V1 ? ?? noise? ? ?? noise? V2 ??? ?? ?, diff.
  Amp? ???? noise? ????.

13
Instrumentation
Non-In Amp
Sensor
Diff. Amp
Non-In Amp
Amplifier System

• ?? ??? ?? ?? ??? ???? ??? ?, Diff. Amp?? noise ??