Patent ID: 8224269
Filing Date: 2012-07-17
Classification: H04B,H04L

Abstract:
1. A system for obtaining a calibrated modulated output signal while minimizing spurious output signals from a vector modulator, the system comprising: a signal generator that generates a first output signal having a plurality of frequency including a modulation component at a desired modulation frequency and first and second test tone components at first and second frequencies, said first frequency being separated by a first predetermined difference from a carrier frequency of a local oscillator providing the signal at said carrier frequency to be modulated by said vector modulator, and said second frequency being separated by a second predetermined difference from said carrier frequency, the second predetermined difference being different in magnitude from said first predetermined difference, and the power levels of said first and second test tone components being lower than the power level of said modulation component at said desired modulation frequency; a detector that receives a sampled signal from the output of said vector modulator when said vector modulator receives said first output signal from said signal generator, said detector measuring power in a plurality of predetermined frequency components of said sampled signal from said output of said vector modulator to provide a corresponding plurality of measured power levels at frequencies determined by said frequency components of said first output signal, said frequencies including at least one frequency that is determined by at least one of said first and second test tone components and is not equal to the either of said first or second predetermined differences; and a controller in communication with said signal generator and said detector, said controller altering said first output signal from said signal generator such that said measured power levels for said predetermined frequency components conform to predetermined values.