Considering a second-order Butterworth LPF using an op-amp, where damping factor = 1.414 find the value of R3, given the following circuit. (R2=5kΩ)(a) 6.71 kΩ(b) 4.22 kΩ(c) 2.93 kΩ(d) 5 kΩThis question was posed to me during an interview for a job.I need to ask this question from Frequency Filters topic in chapter Op-amps and its Applications of Analog Circuits

Considering a second-order Butterworth LPF using an op-amp, where damp

1.	Considering a second-order Butterworth LPF using an op-amp, where damping factor = 1.414 find the value of R3, given the following circuit. (R2=5kΩ)(a) 6.71 kΩ(b) 4.22 kΩ(c) 2.93 kΩ(d) 5 kΩThis question was posed to me during an interview for a job.I need to ask this question from Frequency Filters topic in chapter Op-amps and its Applications of Analog Circuits
Answer» The correct ANSWER is (C) 2.93 kΩ Easiest explanation: MAXIMUM GAIN, A = 3 – α = 1.586 For the above circuit, the gain is 1 + R3/R2 = 1.586 R3/R2 = 0.586 R3 = 2.93 kΩ.

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