What is Gain Flatness?

Gain flatness is the difference between the minimum and maximum gain, measured over a given frequency range. It specifies the range of variation in the gain of a device over the frequency range. Variations in gain over a specific bandwidth can cause issues as different frequency signals will not be amplified equally. distortion in the transmitted signal because frequency components will not be amplified equally. Gain flatness is usually represented in decibel (dB). We typically want this number to be low to get more predictable behavior.

The formula for Gain Flatness is as follows: