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Engineering Notes
RF POWER AMPLIFIERS TECHNICAL REFERENCE MATERIAL
Gain
Normaly expressed in decibels, dB
Power Gain (dB) = 10 Log 10 (RF Output Power / RF Input Power)
Gain is defined as the ratio of the output power to the input power in dB. Assume that the input power is 10 mW (+10 dBm) and the output power is 1 W (1000 mW, +30 dBm). The ratio will be 1000/10 = 100, and the gain will be 10 * log 100 = 20 dB.
It is much easier to calculate gain by converting the power to dBm first, so the gain of the above amplifier will be 30-10 = 20 dB. A simple reduction will reveal the gain. In tradition, all power is read in dBm and the gain is in dB.
Example:
A low noise amp (30 dB gain) cascades with a driver amp (20 dB gain) and a power amp (10 dB gain). The total gain will be 30+20+10 = 60 dB.
| Frequently Used Decibel Conversions |
|
| dB | Power Ratio |
| O 1 (-1) 3 (-3) 6 (-6) 10 (-10) 13 17 20 30 |
1 1.26 (0.8) 2 (1/2) 4 (1/4) 10 (0.1) 20 50 100 1000 |
Gain Calculator
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