Alsahali, Sattam, Gecan, Dragan, Alt, Alexander  ORCID: https://orcid.org/0000-0002-7621-4940, Wang, Guofeng, Syed Anera, Syed M. H., Chen, Peng, Woodington, Simon, Sheikh, Aamir, Tasker, Paul ORCID: https://orcid.org/0000-0002-6760-7830 and Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552
2019.
A novel modulated rapid load pull system with digital pre-distortion capabilities.
Presented at: 2019 93rd ARFTG Microwave Measurement Conference (ARFTG),
Boston, MA, USA,
7 June 2019.
10.1109/ARFTG.2019.8739220
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Abstract
This paper investigates the concurrent operation of a commercially available, modulated impedance synthesis and measurement system with digital pre-distortion (DPD) for industry standard modulated signals. The system was used to characterize a 10W GaN HEMT device, and provide impedance control over signal and distortion bandwidths, in response to a 10 MHz LTE signal centred at 2 GHz, and was able to rapidly achieve target reflection coefficients with an error less than −40dB (1%). A National Instruments (NI) PXi based characterisation system was used to apply a commercially available memory-based DPD algorithm. The transistor was biased in class-AB and was successfully linearised to better than −47.95 dBc ACPR when delivering at 2.5W average output power into an optimum load. Interestingly, the analysis showed that the DPD corrected ACPR contours aligned closely with the P 1dB contours, confirming the relevance of targeting peak-power for DPD, rather than raw ACPR. Also, and importantly, a level of linearity performance was achieved that meets for example, the 3GPP linearity specifications (45dBc) for commercial deployment, and demonstrates how this modulated load-pull system and DPD can be combined to de-risk an amplifier design at a very early stage in the design process.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Date Type: | Published Online |
| Status: | Published |
| Schools: | Schools > Engineering |
| Last Modified: | 05 Jan 2024 08:27 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/124549 |
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