Chapter 11 Op-Amp Applications - Webstaff.kmutt.ac.th

Current-Controlled Controlled Current Source
This circuit may appear
more complicated than
the others but it is really
the same thing.
V
V
V
out
out
R
f
out
R
f
⎛
Rf
⎞
= −⎜⎜
V
R ⎟⎟
⎝ in ⎠
V
= −
in
R || R
V
= −
R
1
in
in
in
2
I
I
I
I
o
o
o
o
=
=
=
=
Vin
−
R || R
−V
in
V
−
R
1
in
1
⎛
−I⎜⎜
1 +
⎝
⎛ R
⎜⎜
⎝ R
1
1
R1
R
⎜⎜
⎛ +
⎝ R 2
R
R
2
+ R
× R
1
2
2
2
⎞
⎟⎟
⎠
2
⎞
⎟⎟
⎠
⎞
⎟⎟ = kI
⎠
Electronic Devices and Circuit Theory, 10/e
Robert L. Boylestad and Louis Nashelsky
13
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