Time-domain calibration technique for ultra-wide instantaneous-bandwidth vector waveform generation using parallel I/Q channels

An architecture for generating ultra-wide instantaneous-bandwidth vector waveforms by combining the spectra of multiple I/Q sub-channels is described. Each sub-channel consists of an I/Q modulator driven by a pair of digital-to-analog converters. A time-domain calibration technique is described that uses the measured channel response to equalize the sub-channels. The overall response of the combined system is realized by properly controlling the phases of the corrected I/Q sub-channels. Examples of wideband vector waveforms generated using the combined system will be given.