Patent ID: 8912804

Claim:
A method for identifying self-generated spurious signals comprising: setting a local oscillator of a test system to an initial frequency; transmitting a radio frequency (RF) signal from a device under test (DUT) to the test system; measuring the physical analog characteristics of the RF signal with the test system; converting the analog values of the measured physical characteristics into first digital equivalents; identifying spurious signal products in accordance with said first digital equivalents; identifying the magnitudes and frequencies of the spurious signal products; resetting the local oscillator of the test system to one or more subsequent frequencies that are offset from the initial frequency; transmitting one or more subsequent RF signals from the DUT to the test system, wherein the DUT maintains the original physical signal settings; measuring respective physical analog characteristics of the one or more subsequent RF signals with the test system; converting the analog values of the measured respective physical characteristics into second or more digital equivalents for each of the one or more subsequent LO frequencies; identifying spurious signal products for each of the one or more subsequent LO frequencies in accordance with said second or more digital equivalents; identifying the magnitudes and frequencies of the spurious signal products for each of the one or more subsequent LO frequencies; and identifying the spurious signal products that have shifted in frequency for each of the one or more subsequent LO frequencies as self-generated signal products.