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An internally compensated op amp is specified to have an open-loop dc gain of 106 dB and a unity gain bandwidth of 3 MHz. Find fb and the open-loop gain at fb.

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An internally compensated op amp is specified to have an open-loop dc gain of 106 dB and a unity gain bandwidth of 3 MHz. Find fb and the open-loop gain at fb.

(a) 15Hz and 103 db

(b) 30Hz and 103 db

(c) 15 Hz and 51.5 db

(d) 30 Hz and 51.5 db

The question was asked in an international level competition.

My doubt stems from Effect of Finite Open-Loop gain and Bandwidth on Circuit Performance topic in chapter Operational Amplifiers of Electronic Devices & Circuits

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Correct option is (a) 15Hz and 103 db

Best explanation: Use the equations below.

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