Amplification factor, power gain and dB
To find the power gain ratio corresponding to a 3 dB change in level, use the formula:
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.
Random schematics
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