Empower RF Home Page Quote Cart   Login Search

Engineering Notes

POWER RF 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

NEED A SPECIFIC AMPLIFIER? VISIT EmpowerRF.com

EN Home


Using CCDF as a Method
of Measuring P1dB and P3dB


RF Glossary of Terms

Watts to dBm and dBm to Watts
Conversion Calculator


RF Amplifiers Gain
Passband Frequency Range Gain Flatness
RF Power
Pulsed Power
Peak Envelope Power
Harmonics & Spurious
Intercept Point
Intermodulation Distortion
Multitone IMD Monograph
Noise Figure & Level
Modulation Types
VSWR & Return Loss (Impedance)
Load VSWR & Protection
Leveling Loops, Input Overdrive Protection
Graceful Degradation
Protection Circuits
DC Input Power & Efficiency
Cooling Methods
Class of RF Amplifiers
Class A Operation
Class AB Operation
Class C operation

    Home Page
    About Empower
    Markets Served

    Contact Us
    Customer Service
    Sales Reps
    International Sales

    Amplifier Options
    Application Notes
    New Products
    Engineering Notes

    Trade Shows
    Media Presence
    Company News
    Job Opportunities

    Useful Links
    Partner Login

2014 International Microwave Symposium
Raleigh, NC
August 3-7, 2014

51th Annual AOC International Symposium
Washington, DC
October 6-9, 2014

RF-Microwave Amplifiers Catalog Request
Empower Catalog


ISO Certified