Problem

A four-stage amplifier has a lower 3-dB frequency for an individual stage of f1 = 40 Hz. W...

A four-stage amplifier has a lower 3-dB frequency for an individual stage of f1 = 40 Hz. What is the value of f1 for this full amplifier?

Solution 1

Write the formula for lower cut-off frequency for full amplifier.

Here,

The frequency is ,

The amplifier has four-stages therefore the value of is 4.

Substitute for 4 and for in the equation to obtain lower cut-off frequency.

Hence, the lower cut-off frequency is.

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