For the following circuit, R2=220kΩ, R1=10kΩ, find the maximum gain and the phase shift at the cutoff frequency.(a) Maximum gain = 22, Phase shift = 45°(b) Maximum gain = 23, Phase shift = 135°(c) Maximum gain = 22, Phase shift = 225°(d) Maximum gain = 23, Phase shift = 45°The question was asked in a national level competition.My doubt is from Frequency Filters in section Op-amps and its Applications of Analog Circuits

For the following circuit, R2=220kΩ, R1=10kΩ, find the maximum gain

1.	For the following circuit, R2=220kΩ, R1=10kΩ, find the maximum gain and the phase shift at the cutoff frequency.(a) Maximum gain = 22, Phase shift = 45°(b) Maximum gain = 23, Phase shift = 135°(c) Maximum gain = 22, Phase shift = 225°(d) Maximum gain = 23, Phase shift = 45°The question was asked in a national level competition.My doubt is from Frequency Filters in section Op-amps and its Applications of Analog Circuits
Answer» RIGHT choice is (d) Maximum GAIN = 23, Phase shift = 45° Explanation: Above is a HIGH PASS filter, with maximum gain = 1+R2/R1 = 23 Phase shift = tan^-1(1) = 45°.

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