Numerical on Non-Inverting Amplifier

Q.  The below drawn schematic of Op-amp 741 is configured in non-inverting mode with R1 = 2 K Ω, Rf = 20 K Ω, fo = 10 Hz & A = 4,00,000. Determine the following  parameters :
1) Af
2) fF

- Published on 26 Oct 15

a. 10.99 & 90.9 kHz
b. 10.99 & 36.36 kHz
c. 10.99 & 20 kHz
d. 10.99 & 10 kHz

ANSWER: 10.99 & 36.36 kHz
 
For non-inverting mode of an amplifier (voltage series feedback amplifier)

1) Af = AB / 1 + AB
But, B = R1 / (R1 + Rf) = 2 k / (2 k + 20 k)
= 1 / 11
1 + AB = 1 + 400000 x (1 / 11)
= 36364.6
Af = 400000 / 3636.4 = 10.99

2) fF = (1 + AB) fo = (36364.6) x 10Hz = 363646 = 36.36 KHz

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