Resistor Layout
Vin--+ \/Output
OP AMP----
- /
| \ R2 = 20k
|__________/
/
\ R1 = 5k
/
GND
Full Analysis:
GIVEN:
Vin = 2V
R1 = 5k
R2 =20k
Va = Vb
A = Vout/Vin
Calculate:
I1
Vout
A
-------------------------------------------------
Vin = Va = Vb = VR1 = I1 × R1
I1 = Vin/R1 = 2/5000 = 0.4mA
Vout = (R1 + R2) × I1
Vout = (5k + 20k) × 0.4
Vout = 25 × 0.4 = Vout
A = Vout/Vin = (R1 + R2) × I1 / R1 × I1
A = R1 + R2/R1
A = 5 + 20 / 5 = 5
Vout = Vin × A = 2×5=10V
