Abstract
This paper presents an accurate technique for the characterization of intermodulation noise in wide band multi carrier power amplifiers. Band limited pseudo noise stimuli which are generated by using a computer controlled arbitrary waveform generator (Awg) connected to anI/q modulator drive the input of the amplifier under test (Aut). The complex envelopes of the pseudo noises are measured using a sampling scope. A vector error correction is applied in order to remove systematic errors due to the imperfections of the measurement channels. Using this technique, the linearity of L and Ka band amplifiers was characterized by the noise power ratio criterion (Npr). This paper focuses also on the particular attention that must be paid to the statistical properties and peak to average ratio (Par) of pseudo noise test signals which significantly impact theNpr measurement accuracy.
Résumé
Ce papier présente une technique précise de caractérisation du bruit d’intermodulation dans les amplificateurs de puissance large bande et multiporteuse. Des pseudo-bruits à bande limitée qui sont générés par un générateur de fonctions arbitraire connecté à un modulateur I/Q excitent l’entrée de l’amplificateur sous test. Les enveloppes complexes des pseudo-bruits sont mesurées en utilisant un oscilloscope à échantillonnage. Une correction vectorielle est appliquée pour enlever les erreurs systématiques dues aux imperfections des canaux de mesure. En utilisant cette technique la linéarité d’amplificateurs en bande L et Ka a été caractérisée en terme de rapport de puissance de bruit. Cet article se focalise aussi sur l’attention particulière qui doit être portée aux propriétés statistiques et au rapport puissance crête à puissance moyenne des signaux de pseudo bruit qui ont un impact significatif sur la précision des mesures de rapport de puissance de bruit.
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Reveyrand, T., Barataud, D., Nebus, JM. et al. Accurate characterization of intermodulation noise in multi carrier wide band power amplifiers based on a digital synthesis of pseudo noise gaussian stimuli. Ann. Télécommun. 61, 627–644 (2006). https://doi.org/10.1007/BF03219926
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DOI: https://doi.org/10.1007/BF03219926
Key words
- Power amplifier
- Intermodulation
- Wide band
- Gaussian noise
- Non linear amplification
- Pseudo random signal
- Signal envelope
- Measurement method
- Calibration
- Time domain method