sharethewell
Member level 5
I am wondering how to measure output power for a low power RF Power Amplifier. (Signal is sinusoidal. Load resistor is 50 ohms)
The RF power amplifier's operation frequency is 433MHz.
So should I use which of the two following methods?
1. Measure RMS voltage across the load resister, then measure RMS current through the load resister. So the power is derived by RMS Voltage X RMS Current.
2. Because V*I is only suitable for low frequency or DC signal, so the RF output power should be derived by measuring RMS voltage across the load resister. Then Power = (RMS voltage squared) / load resister.
Which one is correct? Thanks!
The RF power amplifier's operation frequency is 433MHz.
So should I use which of the two following methods?
1. Measure RMS voltage across the load resister, then measure RMS current through the load resister. So the power is derived by RMS Voltage X RMS Current.
2. Because V*I is only suitable for low frequency or DC signal, so the RF output power should be derived by measuring RMS voltage across the load resister. Then Power = (RMS voltage squared) / load resister.
Which one is correct? Thanks!