Empower RF Home Page Quote Cart   Login Search +1(310) 412-8100

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

Enter RF Input Power:     W

Enter RF Output Power: W

Gain = dB


SSL Certificates

System for Award Management(SAM) Registered

Download Empower Catalog and Guides
Downloads


ISO Certified