Question
Download Solution PDFIn the frequency response graph of an amplifier the 3 dB point refers to :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCritical Frequency:
At 3 dB power of the amplifier becomes half of its total power
It is often known as the “Cut-off frequency”, and it is also known as the “Corner frequency” or “break frequency”
It is defined as the frequency at which the ratio of output to input has a magnitude of 0.707 of the maximum amplitude.
When converted in decibels it is equal to – 3 dB.
\(Magnitude = 20\log \left( {\frac{{output}}{{input}}} \right)\)
The cut-off frequency is a characteristic of the filtering devices, such as RC circuits.
After this cut-off frequency point, the amount of attenuation due to the filter begins to increase rapidly.
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