Patent ID: 7295060
Filing Date: 2007-11-13
Classification: G01R

Abstract:
1. A method of measuring amplitude and phase characteristics of an output signal of an RF amplifier in a device, the RF amplifier amplifying a signal source within the device producing a signal of a known frequency, the gain of the RF amplifier controlled within the device producing to produce a series of predetermined bias steps over predetermined bias step intervals, the method comprising: receiving the output signal of the RF amplifier in a measurement unit, the measurement unit designating at least one of the bias steps as a reference level and a reference interval, the measurement unit measuring amplitude of the output signal and phase information for the output signal over each of the bias step intervals, the measurement unit calculating the phase trajectory of the output signal over the reference interval, and computing the phase shift of the output signal at a bias step interval by subtracting the phase information for the output signal at the bias step interval from the calculated phase trajectory for that bias step interval.