1GP104

Measurements & Results

SMW:

The noise at the RF input of the PA must be extremely low to truly measure the noise generated by the PA. To improve the noise of the RF source an external RF filter can be used between the SMW and the PA.

RF

SMW

Filter PA

9.4 Time Domain

The following figure shows the Vcc signal (dark green) and the RF output signal of the

PA (blue) in the time domain. This measurement requires the RF port of the FSW (for measuring the PA’s RF output signal) and the baseband input ports of the FSW (for measuring the Vcc signal). The Vcc signal is measured using a probe connected directly to the FSW.

1GP104_1E Rohde & Schwarz Envelope Tracking and Digital Pre-Distortion Test Solution for RF Amplifiers 37