RF Power Amp

174

02:52:26

Biased using a 500uA current source for 50mA of collector current through the power transitor. Using a 133pF coupling capacitor for ensuring an output impedance of 50 ohms to perfectly match a 50 ohm load. Each LC filter component has a reactance of 50 ohms at the desired frequency, again to ensure max power transfer.

The output power is:
Vrms^2 / 50 
= 3.06V^2 / 50 = 187.3 mW

or 22.725 dBm

Decreasing the current mirror's resistor from 16.5k to 2.2k, you can really crank up the output power to 1W.

published 0 year ago

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