The maximum output power of the booster is determined by the linearity of the
amplifier block of the booster. For any given input signal power, its
corresponding output is increased by the gain of the booster, the output power
will increase along a linear curve based on the fixed gain value.
If the input signal amplified by the gain set exceeds the rated maximum output,
the AGC (automatic gain control) function will be triggered. The AGC ensures
that the maximum output power of booster is maintained and does not overdrive
the booster
’s amplification circuit. Figure 15 demonstrates the relation between
the output power and the gain.
Figure 11
Suppose maximum output power of booster is 37dBm and its gain is 89dB:
So, when input power is weaker than
–52dBm, output power = Input Power +
89dB
When input power is stronger than -52dBm, output power = 37dBm
4.1.1.2
Link Budget
Below provides a typical process for calculating the link budget of the booster
system. Note that gain is 89dB in the picture below.