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Decibels
0001 Jun 1
2 minutes read

Decibels

10dB = 1Bel = 10:1
20dB = 2Bel = 100:1
30dB = 3Bel = 1000:1

3dB = 2:1 ratio

|——-|———-|
| 0 dB | 1 :1 |
| 1 dB | 1.28 :1 |
| 2 dB | 1.6 :1 |
| 3 dB | 2 :1 |
| 4 dB | 2.56 :1 |
| 5 dB | 3.2 :1 |
| 6 dB | 4 :1 |
| 7 dB | 5.12 :1 |
| 8 dB | 6.4 :1 |
| 9 dB | 8 :1 |
| 10 dB | 10 :1 |
| 11 dB | 12.8 :1 |
| 12 dB | 16 :1 |
| 13 dB | 20 :1 |
| 14 dB | 25.6 :1 |
| 15 dB | 32 :1 |
| 16 dB | 40 :1 |
| 17 dB | 51.2 :1 |
| 18 dB | 64 :1 |
| 19 dB | 80 :1 |
| 20 dB | 100 :1 |
| 21 dB | 128 :1 |
| 22 dB | 160 :1 |
| 23 dB | 200 :1 |
| 24 dB | 256 :1 |
| 25 dB | 320 :1 |
| 26 dB | 400 :1 |
| 27 dB | 512 :1 |
| 28 dB | 640 :1 |
| 29 dB | 800 :1 |
| 30 dB | 1000 :1 |
|——-|———-|

Common mistakes

  • What relative to ? (dBm is decibels relative to one milliwatt.)
  • Amplitude vs. Power (Ampl^2)
  • Negatives (-5dB gain is 5dB loss)



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