%0 Conference Paper %1 Wrana_EuMC2023 %A Wrana, Dominik %A Haussmann, Simon %A Schoch, Benjamin %A John, Laurenz %A Tessmann, Axel %A Kallfass, Ingmar %B 2023 53rd European Microwave Conference (EuMC) %D 2023 %K imported %P 138-141 %R 10.23919/EuMC58039.2023.10290717 %T Effects of Harmonics from Frequency-Multiplicative Carrier Generation in a Superheterodyne 300 GHz Transmit Frontend %X In this paper, the limitations of transmit signal quality, arising from intermodulation of unwanted harmonics caused by the electronic carrier generation based on frequency multiplication, in a superheterodyne 300 GHz transmit analog frontend are analyzed. Using an electronic microwave frequency synthesizer in conjunction with cascaded frequency multipliers delivering an overall multiplication factor of 24, a 210 to 228 GHz carrier is generated. The fourth harmonic generated by the on-chip integrated frequency multiplier-by-three is measured to be present in the RF frequency domain with significant power levels, creating interferers for the modulated signals. An analysis of the spurious tone is performed as a function of the local oscillator power and frequency as well as IF input power to obtain signal-to-interferer power levels as the relevant frequencies lie within the transmitter RF frequency band of operation. Based on continuous wave measurements, system-level simulations are carried out, predicting the signal qulaity limitations for a 1.6 GBd 16-QAM modulated signal, recreating a measurement scenario using a modem-based real-time wireless link.

@inproceedings{Wrana_EuMC2023, abstract = {In this paper, the limitations of transmit signal quality, arising from intermodulation of unwanted harmonics caused by the electronic carrier generation based on frequency multiplication, in a superheterodyne 300 GHz transmit analog frontend are analyzed. Using an electronic microwave frequency synthesizer in conjunction with cascaded frequency multipliers delivering an overall multiplication factor of 24, a 210 to 228 GHz carrier is generated. The fourth harmonic generated by the on-chip integrated frequency multiplier-by-three is measured to be present in the RF frequency domain with significant power levels, creating interferers for the modulated signals. An analysis of the spurious tone is performed as a function of the local oscillator power and frequency as well as IF input power to obtain signal-to-interferer power levels as the relevant frequencies lie within the transmitter RF frequency band of operation. Based on continuous wave measurements, system-level simulations are carried out, predicting the signal qulaity limitations for a 1.6 GBd 16-QAM modulated signal, recreating a measurement scenario using a modem-based real-time wireless link.}, added-at = {2025-05-26T10:46:09.000+0200}, author = {Wrana, Dominik and Haussmann, Simon and Schoch, Benjamin and John, Laurenz and Tessmann, Axel and Kallfass, Ingmar}, bdsk-url-1 = {https://doi.org/10.23919/EuMC58039.2023.10290717}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2779f9fb4017fb00aebf13a67df07a078/ingmarkallfass}, booktitle = {2023 53rd European Microwave Conference (EuMC)}, date-added = {2023-11-05 21:47:20 +0100}, date-modified = {2023-11-05 21:47:30 +0100}, doi = {10.23919/EuMC58039.2023.10290717}, interhash = {8525479269716975f31294159082dc45}, intrahash = {779f9fb4017fb00aebf13a67df07a078}, keywords = {imported}, month = {Sep.}, pages = {138-141}, timestamp = {2025-05-26T10:46:09.000+0200}, title = {Effects of Harmonics from Frequency-Multiplicative Carrier Generation in a Superheterodyne 300 GHz Transmit Frontend}, year = 2023 }