http://hyperphysics.phyastr.gsu.edu/hbase/electronic/opamp.html#c4
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http://en.wikipedia.org/wiki/Image:K2w_vaccuum_tube_opamp.jpg1
+Vin
+
Vout
Vin

Vs
Features of OpAmpsON
NC
+Vs
Vin
+Vin
Vout
Vs
ON
Infinite open loop gain (GOL):
Zero common mode gain
Infinite bandwidth:
Range of frequencies with nonzero gain
Real OpAmp
Limited open loop gain:
Decreases with increase in frequency
Nonzero common mode gain
Limited Bandwidth:
Gain becomes zero at high frequencies
Characteristics of OpAmpsInfinite slew rate
Infinite input impedance
No input current
Zero output impedance
Infinite output current
Real OpAmp
Finite slew rate
Large input impedance
Small input current
Nonzero output impedance
Limited output current
Characteristics of OpAmps+Vs
iin = 0A
+
Vdiff
Vout = Vdiff x Gopenloop

Vs
+Vs
(1) V  Vout = R2 x i
iin = 0A
+
Vout
(2) V =  R1 x i
Vdiff = 0V
Vin

V = V+ = Vin
(2) i = Vin/R1
0A
Vs
R1
R2
i
(1) Vin – Vout = Vin x R1/R2
V
V  Vout
Vout = (1 + R1/R2) x Vin
+Vs
(1) V  Vout = R2 x i
iin = 0A
+
Vout
(2) Vin  V = R1 x i
Vdiff = 0V

Vs
V = V+ = 0
(1) i = Vin / R1
Vin
R1
R2
i
Vin – V
V  Vout
Vout =  R2/R1 x Vin