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Amplification Factor, Power Gain and dB

To find the power gain ratio corresponding to a 3 dB change in level, use the formula:
power gain db

The table showing the amplification factor if you know the power gain in dB

power gain dB amplification factor
1 1.26
2 1.58
3 2
4 2.5
5 3.16
6 4
7 5
8 6.3
9 7.95
10 10
11 12.6
12 15.8
13 20
14 25
15 31.6
16 40
17 50
18 63
19 79.5
20 100

For example if we use BLY90 which has a power gain of 5 dB at 12.5V and 175MHz this results in a total amplification factor of 3.16 times. If we want to amplify 3W with BLY90 we’ll get almost 10W at the output.
There are different types of transistor, some have a huge power gain link 2N3866 which has a 20dB power gain at 28V 100MHz which results in an 100 times amplification factor. With only 10mW 2N3866 has a 1W output power.

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