Question

(a) An inverting amplifier has a closed-loop voltage gain of -25. The op-amp used has a low-frequency, open-loop gain of 2 × 10^4 and has a unity-gain bandwidth of 10^6 Hz. (a) What is the 3 dB frequency f3-dB of the op-amp and the 3 dB frequency f3-dB of the closed-loop amplifier? (b) Using the results of part (a), what is the magnitude of the voltage gain for the open-loop and closed-loop amplifiers at f = 0.25 f3-dB and at f = 5 f3-dB? (b) The low-frequency open-loop gain of an op-amp is 2 × 10^5 and the second pole occurs at a frequency of 5 MHz. An amplifier using this op-amp has a low-frequency closed-loop gain of 100 and a phase margin of 80 degrees. Determine the dominant-pole frequency.

          (a) An inverting amplifier has a closed-loop voltage gain of -25. The op-amp used has a low-frequency, open-loop gain of 2 × 10^4 and has a unity-gain bandwidth of 10^6 Hz. (a) What is the 3 dB frequency f3-dB of the op-amp and the 3 dB frequency f3-dB of the closed-loop amplifier? (b) Using the results of part (a), what is the magnitude of the voltage gain for the open-loop and closed-loop amplifiers at f = 0.25 f3-dB and at f = 5 f3-dB? (b) The low-frequency open-loop gain of an op-amp is 2 × 10^5 and the second pole occurs at a frequency of 5 MHz. An amplifier using this op-amp has a low-frequency closed-loop gain of 100 and a phase margin of 80 degrees. Determine the dominant-pole frequency.

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