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## RF POWER AMPLIFIERS TECHNICAL REFERENCE MATERIAL

### Peak Envelope Power

###### PEP (AM)

% Modulation = (( PEP - PC) / PC) *100%

Example:

Carrier Power PC = 100 W, PEP = 400 W.

## Determine % Modulation

M% = (( 400 - 100) / 100) *100% = ((20-10) / 10) *100% = 100% MOD.DEPTH AVERAGE POWERINCREASE DUE TOMODULATION RATIO OF PEP TO CARRIER POWER M% dB = 10 LOG(1 + M2 / 2) RATIO dB = LOG(1 + M)2 RATIO 30507080859095100 0.190.510.951.211.341-481.621.76 1.051.131.251.321.361.411.451.50 2.33.54.65.15.35.65.86.0 1.72.32.93.23.43.63.84.0

## Example:

F1 = 10 MHz
F2 = 10.1 MHz
E1 = E2 = IV
RL = 1 Ohm

###### SINGLE CARRIER CASE (F1 only)

P = E2 / R = (1)2 / 1 = 1 Watt CW or PEP

###### TWO CARRIER CASE ( F1 & F2 )

The voltage phasors, E1 & E2 are at a maximum every 10 microseconds since:
Coincidence Rate = 1 / (F2 - F1) = 1 / ((10.1 - 10) *106) = 10 Microseconds
At coincidence E1 & E2 add directly, therefore:
P = E2 / R = (1+1)2 / 1 = 4 Watts PEP

###### N CARRIER CASE (F1 + F2 ... +Fn)

P = E2 / R = N2 / 1 = N2 Watts PEP

 NUMBERS OFCARRIERS POWER IN EACHCARRIER FOR 7 WPEP OUTPUT PEP OUTPUTPOWER FOR N1 W CARRIERS N P = 1 / N2 Watts P = N2 Watts 123410 1 W250 mW111 mW63 mW10 mW 1 W4 W9 W16 W100 W

Touch Screen Color LCD Controller & Remote Operation Ver 3.93 Rev 3.3-3.8
Not applicable to "Next Generation" platform

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