How is a Phase and Amplitude versus Time Measurement Made?
The Phase and Amplitude versus Time measurement provides a way to characterize the magnitude and phase errors introduced by the non-linear effects of power amplifiers operating over a wide dynamic range. Measuring the amplitude, phase and frequency as a function of output level makes it possible to create a more accurate output signal by pre-distorting the input signal to the power amplifier. The Phase and Amplitude versus Time measurement is performed on a continuous wave signal with either a discrete amplitude step waveform (Discrete Waveform Calibration Signal) or continuous ramp waveform (Continuous Waveform Calibration Signal). This measurement requires you to put your mobile station into a test mode that can command the mobile station to generate a waveform, which can be either discrete or continuous. The Discrete Waveform Calibration Signal may include up to 512 measurement intervals (steps), which can be of varying widths (100 us to 400 ms) and amplitudes (-20 dBm to +35 dBm).
