DOI: 10.1109/TMTT.2024.3487823   IEEEXplore: https://ieeexplore.ieee.org/document/10747030

Ultrawideband signal generator that combines outputs of multiple high-resolution narrowband channels to generate a wide instantaneous bandwidth and high peak data rates

D-Band (149 GHz) demonstration

Periodicity of test signals enables division into multiple subbands, each sunbands generated with a dedicated channel consisting of IQ-DACs and IQ mixers with phase-coherent LOs, then combining all the channels to create a wide instantaneous bandwidth signal. A calibration technique applied to the architecture that uses nonuniformly interleaved tones to correct IQ imbalances, phase and magnitude offsets across channels, and linear distortions in each RF chain.

6G component testing, Ultrawideband amplifier linearization, Instrumentation.

12 GHz instantaneous bandwidth 256 QAM OFDM signal at 96Gb/s peak data rate demonstrated. The calibration technique improved error vector magnitude (EVM) from 82.6% to 2% and normalized mean square error from 23.8% to 1% for the demonstration. Application of the demonstration system to linearize a D-Band PA as device under test over 12 GHz of bandwidth and driven with a 4 GHz instantaneous bandwidth 256 QAM OFDM signal, the adjacent channel power ratio (ACPR) improved from -27.8/-26 dBc to -42.8/-43.1 dBc, and the EVM performance improved from 8.5% to 1.2%.