§ 3-2 OP-AMP --resistor circuits
00 ???? PNi iiR
tc o n sA BAcBAx t a n)(0 ?????? ??????
CoR ?? ??? 20
??
?
?
??????
?
?
0
00
i
iiR
i
The inverting OP-AMP circuit.
iRRKCL xx ????
2
2
1
1,????
00 ?? ia n dx??
1
2
1
2
2
2
1
1 0 RRorRR ???? ????
A?
B?
2??
?
?
0x?
Ni
Pi
??
?
?
?
x?
2R
?
?
2??
?
1?
i1R ??
?
?
?
The non-inverting OP-AMP circuit.
0:
2
2
1
???? i
RR
KCL
xn o d eat
xx ???
1,0 ?? ?? xa n di?
Example 3-1:In the inverting and non-inverting OP-AMP
circuit,gains are 10,Find R1,R2.
For the non-inverting circuit:
)( 12
1
2
1
2 11 ??
?
? ?????
R
R
2R
xx?
?
?
2?
?
?
1?
i
1R
???
?
?
For the inverting circuit,.1 0 0,,10:,10,10
21
1
2
1
2 kRt h enkRifRR ??????
.90,,10:,101,10 21
1
2
1
2 kRt h enkRifRR ???????